central air-conditioning systems inverter technology the Discussion 
 

 
 type; (3) change the temperature of the chilled and cooling water systems, the loop will appear in PII9 deviation of the constant correction, so that the inverter to continue to be adjusted according to the PI regulator or built-in PID operation (acceleration or deceleration ), the pumps work in the best working condition; (4) When the system interference signal, the PID regulator to respond quickly (see Figure 3). 5 characteristics of the modulus of closed-loop control of the central air conditioning pump energy-saving systems in recent years,ralph lauren, with the continuous development of fuzzy control theory, the control algorithm also continue to be applied to practice. It is not only able to achieve control, and can simulate the human way of thinking,abercrombie münchen, effective control can not construct the mathematical model of the controlled object; fuzzy intelligent control will not overshoot phenomenon (see Figure 4),hollister carugate, so the saving rate will be increased; system interference signals can quickly respond to external disturbances,mulberry, a strong anti-jamming capability of fuzzy systems; central air-conditioning pump frequency operation using fuzzy digital control,ralph lauren danmark, the intelligence to further improve the system anti- interference will be strengthened, energy-saving effect will be increased. With the continuous development of microcomputer technology, fuzzy control will be applied in wider areas. System hardware design block diagram shown in Figure 5. ,, . Two :: ~ / _ /  ,mulberry outlet,. The overshoot disturbance white {I respond to ll {Figure ID adjustment f /, Overshoot response: Gansu action /}} / Figure 4 Fuzzy Intelligent Control system hardware design block diagram of the 6 application examples in a hotel in central air conditioning system a total of two sets of Carrier 165kW (225 tons), host one with a prepared way to run an average annual run over 7000 hours, the building office buildings and hotels. An annual average of more than 7000 hours of running time,hollister belgie, in addition to the hotel No.. 4,hollister neuss,2006, Dec. The vo1.25 the (TotalNo.97) portion must be a daily 24-hour run, the office part of just during the day time for air-conditioning,abercrombie hamburg, daily cooling time is less than 1O hours, night, office do not use air conditioning when the heat load is smaller, water pumps still high load to the motor constant speed operation, resulting in pressure bypass valve action, short-circuit part of the flow, resulting in a large waste of energy. 6.1 specific transformation method (1) chilled water system: to ensure that refrigeration units for chilled water flow under the premise,abercrombie düsseldorf, the minimum operating frequency determine the work of a frozen pump inverter can be set to lower frequency. The pump motor frequency modulation Figure 6 chilled water control system in Figure 7 cooling water control system failure frequency conversion power frequency fault frequency power frequency section is installed in the system pipe temperature sensor measured backwater temperature. Thermostat settings for comparison. Frozen return water temperature is greater than the set value, the maximum frequency of the inverter output,ralph lauren sverige, the pump motor, high-speed operation; when Frozen return water temperature is less than the set temperature the motor to set the frequency curve. The system shown in Figure 6. (2) cooling water systems: cooling water system to the differential pressure signal as the feedback signal, the constant pressure differential control system shown in Figure 7. 6.2 transformation function (1) variable frequency / power frequency switching function: If the conversion of a switch to (2) closed-loop automatic run function: change-over switch placed in the (3) open-loop adjustment: change-over switch placed in the From the operation, the frequency converter has the following characteristics: 1) energy saving effect is significant; 2) to achieve a soft start, motor starting current dropped significantly, to avoid the impact of motor starting on the grid; 3) equipment run more smoothly, eliminating start and stop the water hammer effect; 4) closed-loop automatic control, increased levels of automation, safe and reliable, unattended. 7 Conclusion inverter technology used in central air conditioning is a very mature application of technology, investment, energy-saving effect is very good, with significant economic benefits, and can improve the control system, improve system quality factor, control overshoot and enhance the system anti-jamming capability, is a worthy application of technology. 8 References [1] Wei Hongyi. Refrigeration and air conditioning equipment, electrical control [M]. Guangzhou: Guangdong Science and Technology Press, 1998 [2] Li Xianguang. Abroad ammonia refrigeration system, the new security settings [J]. Refrigeration, 72D5, 24 (4) :47-49 [3] Liu Qingjiang. Cold storage air cooler melt the frost energy conservation [J]. Refrigeration, 2005,24 (4) :12-15 
 

 
 multi air conditioning unit energy efficiency rating national standards the publication 
 

 
 heat pump water heater,ralph lauren skjorter, new GB formally implemented 
 

 
 = (O.14389, 0.36366,0.30338,0.15578,0.03909). '. 'B = A * R = (b1, b2,hollister, ..., b) = (0.144,abercrombie düsseldorf,0.364,0.303,0.156,0.040) in accordance with the principle of maximum value of u the evaluation results max (b1, b2, ..., b) = bi = 0.364. Evaluation results,ralph lauren, the second largest index value, so the large cold ammonia refrigeration system for Comprehensive Evaluation of the second category, that is good. 5 Conclusions from the above fuzzy comprehensive evaluation shows that the large cold ammonia refrigeration system operating conditions are considered. However, the actual impact of the factors is more complex, and 0.364 and 0.303 between the two is closer to, the advantage of Industry information on the use of fuzzy comprehensive evaluation method to evaluate large cold ammonia refrigeration system operating conditions, can effectively improve the reliability of the comprehensive evaluation of the scientific method and results. Evaluation methods, for Comprehensive Evaluation of the use of two fuzzy comprehensive evaluation method is reasonable, and better. However, in the specific application process, the evaluation does not completely replace the technical staff reasoning,hollister dortmund, but can not completely replace the sensory judgment of the maintenance and operating personnel. All enterprises should be according to their own actual situation, the flexibility to use the evaluation method,calzoncillos calvin klein, in order to achieve better results. 6 References [1] Wang Caihua, Song and groaning. Paste on the methodology [M]. Beijing: China Building Industry Press, 1995 [2] Hu Shuli. Paste mathematics and its application [M]. Chengdu: Sichuan University Press, 1994 [3] Yuhua Ming. Cold storage and refrigeration technology [M]. Beijing: People's Posts & Telecom Press, 2003 GB of heat pump water heater formally implemented in 2008, the new participation in the formulation led by the United States and the central air-conditioning, heat pump water heater for commercial or industrial use and similar purposes GB (GB/T21362-2008) May 1 implementation. Domestic heat pump water heater is basically to maintain an annual growth rate of 300% to 400%, mainly applies to families,calvin klein, schools and hospitals, such as extensive use of hot water units. The huge market of manufacturing enterprises greatly increased, there are nearly 200 enterprises in Guangdong in 2006, wishing to enter the industry. GB will play a guiding and regulatory role, the interests of consumers to get the maximum protection, while improving industry access threshold,hollister donauzentrum, and help to improve the technical level of the industry,hollister, and promote the healthy development of the industry. Maglev frequency centrifugal chillers R & D organization on May 9 and through the identification of the Guangdong Provincial Light Industry Association, presided over the meeting of the Guangdong Province Zhuhai Gree Electric Appliances Co., Ltd. The project studies the application of maglev centrifugal DC inverter compressor, and research and development of a modular two-plane parallel technology,ralph lauren danmark, new technologies of the two-stage compression with flash technology, high efficiency flooded heat exchanger,abercrombie hamburg, condenser solved effectively reduce the flow film thickness in a timely manner to drain away the upper heat exchange tube condensate evaporator stable form of nucleate boiling heat transfer tube microchannel refrigerant, also uses the part load operation of the control of energy-saving technologies and therefore has a strong innovative system integration optimization, the unit at full load EER reached a national energy efficiency rating level. Group that the project has a green energy efficient and control of advanced technical features, it was agreed through the identification. - (Institute of Refrigeration in Guangdong Province reported) 
 

 
 accelerate change the growth mode, improve the capability of independent innovation,hollister belgie, promote China's industrial shift from large to strong - the National Development and Reform Commission held a national work conference of industrial development 
 

 
 solution of aluminum, cement and automobiles industry total contradiction to ease the favorable opportunity, efforts to promote structural adjustment; at the same time in accordance with the concept of circular economy, do a good job of high energy consumption, high pollution, the development potential of the industrial upgrading of the raw materials for industry; to their comparative advantage, while in the grasp of the northeast old industrial base and western structural adjustment efforts to promote the rise of central China. Discuss the delegates around Guobao report to local realities, and on the transformation of economic growth,hollister roma, promote strategic adjustment of industrial structure, optimize the layout of regional industrial issues such as warm and in-depth discussion and recommendations. (1) recommended that the countries to strengthen the guidance, support resources to the development of heavy chemical raw materials, industrial development. Now intense competition, rapid changes in the market, the project up and may not be able to produce the necessary effectiveness. Such as aluminum and petrochemical industries,ralph lauren danmark, a few years ago-effective, now fell more serious impact on the local economy. (2) suggested that the state in the process of macro-control,mulberry, attention to regional differences, differential treatment, to prevent one size fits all, eliminate backward production capacity should be actively and steadily push forward, the use of economic,hollister deutschland, legal and market means. (3) suggested that the state will meet the development trend of regional economic integration,hollister köln, and support the Shanghai Chemical Industry Park. Tianjin Binhai New Area to accelerate the development of Fujian Province to establish a West Coast Economic Zone. (4) recommend policies to encourage innovation policy, tax policy to make the necessary adjustments to strengthen IPR protection. Countries will enhance the capability of independent innovation on an important position to seize a key. Current domestic and foreign enterprises, between enterprises of different industries processing tax is not fair, coupled with the market economic order is not yet standardized,hollister, influence the enthusiasm of enterprises to increase investment in science and technology. (5) recommends that the state has increased efforts to support the development of special industries in the western region, the priority in the industrial layout,hollister frankfurt, and narrow the gap between the developed regions. (6) suggested that the state continue to maintain a certain degree of input into, to support the development of competitive industries in the three northeastern provinces, lay a solid foundation for the development. (7) suggested that the country as soon as possible to promote rise of Central China policy, cf. The three northeastern provinces to support the reorganization and transformation of old industrial bases in the central region urban enterprises,hollister online shop, speed up the central region of raw materials, equipment manufacturing, deep processing of agricultural bases. (8) Central region to lead the development process, the need for the state to strengthen the guidance to promote the industry, the upper _ ± check on the level. Industry Secretary Liu Tienan In his concluding remarks said: China's rapid industrial development, international competition is more intense, some industries face market constraints have become increasingly apparent. Work should pay attention to two aspects: First, to promote industrial development in China from relying mainly on the comparative advantage to shift with core competitiveness, to improve the capability of independent innovation of the importance and urgency of understanding from the nurturing enterprises to constantly deepen dominant position, improve the utilization of foreign funds, and promote the reorganization of the enterprise group, creating a policy environment and expand domestic market demand of manpower and strive to improve the capability of independent innovation, so that in our country in international competition gradually without me, my strong favorable status; focus on regional coordinated development of industrial economy, in promoting the development of the western region, northeast old industrial base revitalization, and promoting rise of central China and eastern to take the lead in the development process, from reality, according to local conditions and plan development, make great efforts to cultivate special industries vigilance and prevent industrial identical, to promote the coordinated development. The meeting next year to focus on doing the work arrangement. First, stability control policies to ensure a smooth running. To maintain stable and rapid economic growth,hollister hamburg, to avoid the ups and downs as an industrial macro-control tasks. Pay more attention to the distinction,hollister donauzentrum, guidance, and pay close attention to the economic operation of the new situation and new problems, to propose a solution in a timely manner. The second is to improve the independent innovation, the implementation of a number of observations. Must conscientiously implement the State Council on speeding up the revitalization of equipment manufacturing industry Accelerate the study and formulate relevant policies for the development of major equipment to strengthen the organization and coordination, relying on key projects, and actively promote clean and efficient gas turbine power generation equipment in key areas and equipment. The third is to deal with excess capacity, speed up structural adjustment. Iron and steel, nonferrous metals, automobile and cement industry has excess capacity, to seize the current market pressure, enterprises have an incentive to the development of policies favorable opportunity to closely focus on the elimination of backward production capacity, promote the consolidation and reorganization, to support the backbone of enterprise products structure upgrades to speed up restructuring. 
 

 
 refrigeration system evaporator model and numerical analysis 
 

 
, the outlet enthalpy of the refrigerant pressure drop adjustment assume that the two-phase region to calculate the length of two-phase pressure drop II, the pressure drop length of the actual long look star output end of the program flow chart in Figure 1 has been adjusted to the numerical simulation of the export enthalpy Analysis of the steady-state simulation of a heat pump air conditioners in the name of cooling and heating in the name condition, the evaporator is divided into 6; simulation of this article took only 1 road. The structure diagram of the heat exchanger shown in Figure 2. The nominal cooling condition parameters for outdoor dry bulb temperature 35 ° C wet bulb temperature of 24 ° C, indoor dry bulb temperature, wet bulb temperature of 19 ° C; supplement the superheat is 8 ℃. Due to space limitations, this article gives only the evaporator of the refrigerant in the name of the status of the simulation results. Air --- | words -. - An import system steady-state simulation results of the tender 9-II cypress Figure 2 Heat Exchanger Schematic diagram of import air, 'Head: Figures 3 through 6,abercrombie münchen, respectively, given the pressure of refrigerant in the evaporator tube temperature, dryness, the gap rate along the tube length changes calculated results. It can be seen from the results along the flow direction of refrigerant pressure drop, and the two-phase region the pressure drop is greater than the pressure drop of the overheated zone, this is because the two-phase region the frictional resistance than the overheated zone. Refrigerant in the evaporator temperature of 570 565-560555550545'540        ... for a 012345678z (m) Figure 3 refrigerant pressure with the tube length changes in September 2006 25 3 (total 96) refrigeration / 1,1 {,hollister milano,  O12345678z (m) O. o6O. O5E0.04O. O3 ■ Jue o. 02O, O1O-/Ll7  1O12345678z (m) Figure l3 pipe outside air temperature difference between the liquid velocity along the tube length changes with the tube length changes in Figure l4-air side of the unit tube length analysis of moisture content first increased and then decreased. Sliding than along the tube length, showing a significant non-linear changes, sliding moderate variation stem is low,abercrombie hamburg, increased with the dryness, the rising trend to accelerate. Figure 10-12, respectively, given the heat transfer coefficient of refrigerant in the evaporator tube, heat flux tube wall temperature along the tube length changes calculated results. It can be seen from the results when the tube length z <5m, dryness <0.9, the refrigerant side heat transfer coefficient, two-phase flow in the wet wall region, when the tube length z-> 5m,hollister wien, two phase flow into the evaporated area,hollister dortmund, heat transfer coefficient is drastically reduced, the heat transfer conditions deteriorate. Figure 13 shows the air temperature difference of evaporator tube with the tube length changes. It can be seen from the results, the air temperature difference between the step changes,hollister carugate, this is the result of air flowing through the turn of the front and rear. Figure 14 shows the calculation results of the evaporator air side of the dehumidifying volume changes along the length of the tube. It can be seen from the results, the heat transfer coefficient of the trend in the air side of the dehumidifying amount of pipe, tube length z <5m, dehumidifying more, when the tube length z-> 5m, dehumidifying less and into the overheated zone, no analysis of moisture content. 4 Conclusions In this paper, a mathematical model of the evaporator flow to introduce the phase model of the mathematical model of the flow characteristics of the refrigerant within the pipe, and the preparation of a numerical simulation program for refrigerant R22 refrigeration system, on account of the actual existence of the impact of the system, the model better reflect the flow characteristics of the refrigerant in the evaporator. Model from the refrigerant pressure, temperature and dryness,hollister köln, with the evaporator tube length change results more reasonable. a diameter d, mh a specific enthalpy,hollister roma, J / l [the gP one pressure, temperature PaRe a Reynolds number, K a specific volume, m3/kg Lord of the £ a long, mr refrigerant m a mixed phase of s - a two-phase flow of saturated coffee a maximum value of the COn a condenser 5 reference literature symbols in Table G mass flow rate,hollister, kg/rn2sm a mass flow rate, kg / su fluid velocity, m / s, the mouth - surface tension, N, / m, a friction resistance coefficient (r) a local drag coefficient P a density kg/rn3 △ an undercooling, K subscript a metastable f liquid g gas ca / ​​a calculated value / ow a minimum value of e Xiu evaporator - gas stream c is a critical one congestion cap an actual value ∞ a undercooled Geyun Ting,ralph lauren skjorter, Yan Kai Sen [1]. Evaporator dynamic parameters of mathematical model and theoretical calculations [j]. Journal of Refrigeration, 1995,ralph lauren danmark, (1) :9-17 [2] Huang Hu. Air-cooled heat pump chiller dynamic characteristics of the process of frost [doctoral thesis] [D]. Xi'an: Xi'an Jiaotong University, 1999 [3] Wang Peiyong Yuan repair dry. Computer simulation of car air conditioning systems, Beijing University of Aeronautics and Astronautics Journal, 1997,23 (5) :590-595 [4] Kazuhiko Kai Sen. Air-conditioning refrigeration technology [M]. Beijing: China Building Industry Press, l9835O5O5O5D5 handsome, such as = 2pv tear ridicule g II ugly down 
 

 
 solar liquid desiccant air conditioning system,abercrombie hamburg, energy storage characteristics of the experimental study 
 

 
 degrees. Every half an hour to take the solution, test solution concentration after the end of the regeneration solution, the actual concentration of slightly more than 40%. Figure 5 and Figure 6 shows, increasing the concentration of dehumidification solution will lead to the decrease of the COP of the system. This is because the desiccant solution concentration increases, the absorption ability, to increase the dehumidification capacity of renewable heat increases; at the same time due to the difficulty of regeneration, in order to maintain the regeneration of the amount of dehumidification amount equal need to improve the regeneration temperature, the system energy consumption to increase, resulting in the COP decreases. Similarly with the regeneration solution temperature increased, the regeneration efficiency to improve the regeneration solution concentration improved, section 27 (3) (104) September 18642O0O002008 years refrigeration 5 to continue regeneration will need to consume more calories, as shown COP increased power consumption, is an ideal storage refrigeration and dehumidification capabilities empty to flatten. Adjust the way. 5 Conclusions 1) The solar liquid desiccant air conditioning system with different modes of operation,hollister milano, you can solve the solar continuity,abercrombie hamburg, so all-weather use. Solution stored chemical potential energy can be more easily into the required for HVAC dehumidification. 2) regeneration solution temperature increases,ralph lauren danmark, the regeneration of the system, the storage coefficient and the COP of the system will be increased significantly. 3) regeneration of liquid to gas ratio decreases, the system's storage coefficient and the COP of the system increases. 4) renewable concentration increases, the COP of the system decreases. 5) The system uses low grade heat source, the less air pollution, conference information 6 References [1] Eongo, G. A. ; Gasparella. A. Experimentaland out eoredcalanalysisofheatandmasstransferinapackedcolumndehu-midifier/regeneratorwithliquiddesicc0ant. InternationalJour-nalofHeatandMassTransfer48 (2005) :5240-5254 [2] Fang Cheng super-Sun Ketao. Model and analysis of solar liquid desiccant air conditioning system [J]. Solar Energy. 2007,18 (2) :128-133 [3] SUN CHEMICAL INDUSTRY. The solar liquid desiccant air conditioning system performance parameters [J]. Fluid machinery. 2OO7.35 (7) :61-66 [4] Pei Qingqing, Han Jun Zhao. Type solution of the solar collector regenerator performance experiments [J]. Guangzhou University. 2O07.6 (6) :79-82 [5] Chen Ying and so on. A honeycomb paper felt filler for the experimental study of the regeneration process of dehumidification solution [J]. Journal of Refrigeration. 20O7.28 (3) :20-23 the Shaanxi HVAC,abercrombie düsseldorf, Xi'an refrigeration 2008 Annual Conference was held in Shaanxi HVAC, Xi'an cooling the 2008 Joint Annual Conference l8 July 2008 to 20 in the ancient city of Xi'an culture very heavy summer resort, Chang Ning Gong held. The seminar was organized by the HVAC Committee, Shaanxi Province and Xi'an Institute of Refrigeration,calzoncillos calvin klein, the major architectural design institute in Xi'an area, as well as institutions of higher learning on the air conditioning and refrigeration professional well-known expert,abercrombie madrid, professor, member representatives were invited to attend the meeting,hollister neuss, was invited to the meeting was attended by renowned experts Shandong University of Technology Professor Fang Zhaohong TROX Air Conditioning Co., Ltd. Technical Director Dr. Guo Jianxiong and Beijing Sheng dragon,hollister deutschland, Zhejiang Jiang Tianren, Hebei holy spring, Beijing holiness, beauty, Carrier, Trane, quadruple, Tengen air conditioning and refrigeration equipment manufacturers R & D department senior technical backbone, a total of more than 130 people. The seminar was presided over by the Shaanxi Province HVAC Committee Renji Wei and chairman of the Xi'an Institute of Refrigeration, Huang Xiang, Xi'an Association for Science Minister Yan Zhen flutter leading comrades attended the meeting and spoke. Annual Conference local source heat pump technology, creative content and design points of energy-saving and ecological evaporative cooling air conditioning engineering and technology, the new On behalf of around four thematic reports, and HVAC engineering design and equipment and energy saving issues,abercrombie münchen, a very lively discussion. The General Assembly received a total of 47 papers, and compiled July 20, academic director of Ji Wei and Huang Xiang,hollister hamburg, chairman of a closing statement and thank the word harmonious atmosphere successful conclusion. - (Special correspondent of Shaanxi Province, Zheng Aiping reported) 
 

 
 13 multi-unit national checks 
 

 
 similar to the air-cooled condenser energy balance machine. In the measurement of air-cooled chiller, the chilled water to provide cooling capacity to the room through the energy balance machine, you can balance the heat load of the measured unit part, to reduce the cooling capacity to maintain a test environment required to reduce the energy consumption of environmental refrigeration units. Chilled water through the energy balance machine to heat up, but also reduce the load on the electric heating. In the measurement of water source heat pumps, cooling water energy balance machine to the room to provide heat, you can balance the measured unit part of the cooling load, reduce the heat to maintain the test environment required to reduce the energy consumption of environmental heating device. Cooling water through the energy balance machine cooling, and reduces or completely eliminates the need for the load of the cooling system. In addition, you can also improve the detection capabilities of the testing equipment. Energy efficiency and detection capabilities will be discusses in another paper. (4) The program is also suitable for the detection of the heat pump water heater, the detection principle is the same. 6 References [1] GB/T7725-20O4 room air conditioners [S]. [2] GB/T18837-2OO2 VRF air conditioning (heat pump) unit [s]. [3] the GB/T18430.2-2001 steam compression cycle in cold water (heat pump) for household and similar use cold water (heat pump) unit [s]. [4] the GB/T10870-2001 displacement and centrifugal chiller (heat pump) performance test method [S]. [5] GB / r19409-2003 water source heat pump unit [s]. Special correspondent Gen dossier] Shanghai Bureau of Labor Insurance provides equipment,abercrombie hamburg, refrigeration repairman certificates Shanghai Municipal Labor and Social Security Bureau recently released on the implementation of the vocational qualification system in the city, the first technical complexity as well as involving public safety, personal safety and the interests of consumers, including food quality inspectors, refrigeration equipment repairman, central air conditioning work, car maintenance workers, home electronics repairman, including the 28 occupations (jobs) to implement the vocational qualification level into the system, in order to further standardize the employer's employment practices, from the source to reduce security risks, and safeguards public security, personal safety and the interests of consumers of practitioners. to review the replacement of the Shanghai Labor and Social Security departments,hollister roma, the access system from 2OO6 September 113 was introduced, without obtaining the professional qualification of the staff has been engaged in, shall obtain the corresponding professional qualifications within one year certificate before taking vocational qualifications access to occupations (jobs) training staff, you can get the training i / 0: ~ b posted, in violation of the behavior of the access provisions of the vocational qualification,ralph lauren sverige, labor security supervision departments will be punishment. 13 kinds of multi-unit national checks AQSIQ nearly 13 multi-line air-conditioning unit product quality, national supervision and spot checks. A total sample of 14 enterprises of the six provinces of Liaoning, Shanghai,hollister wien, Jiangsu, Zhejiang,abercrombie hamburg, Shandong, Guangdong and other 14 kinds of products, qualified l3 kinds of product sampling rate of 93%. The spot checks found in the main quality problems are: (1) cooling performance system failed. The sample of products refrigeration coefficient of performance does not meet the standards specified value, the measured value of 2.05W / W (GB provisions of 2.76W / W), the main energy-consuming large. (2) a mark is not standardized. The sampling products nameplate does not indicate a cooling coefficient of performance. The AQSIQ instructed Quality Supervision Ministry around the f-1x,hollister donauzentrum,-l checks in better-quality products and enterprises in recognition. Substandard product quality companies for processing in accordance with the Product Quality Law and other relevant laws and regulations, and urge enterprises to rectify themselves strictly, the deadline for review, to promote the overall quality level of the refrigeration and air conditioning industry to further improve. The sampling of the manufacturers of qualified products: Shanghai Daikin air conditioning, commercial air conditioners in the United States, Shenzhen,hollister frankfurt, McQuay, Trane, Qingdao Haier air-conditioning electronics, Zhuhai Gree Electric Appliance,abercrombie españa, Wuxi Little Swan Central Air Conditioning, Suzhou Samsung Electronics Co.,hollister dortmund, Qingdao Hisense 13 legislation, air conditioning,mulberry, air conditioning Haier (Qingdao),hollister online shop, Mitsubishi Heavy Industries, Guangzhou Matsushita air conditioning, Guangdong Chigo Air Conditioning and Zhejiang Deer air conditioning. 
 

 
 Shanghai energy saving on air conditioning and refrigeration industry the requirements 
 

 
 has obvious advantages, COz freezing point temperature of 56.55 ° C, the evaporation temperature of the cooling system up to a low temperature of 55 ° C, especially suitable for supermarket refrigeration systems, food processing plants, food preservation, medical drugs vaccine storage and cultivation of crop seeds,ralph lauren danmark, no cooling system corrosion,hollister neuss, pollution-free food; CO2 can NH3/COz and R290/CO2 natural refrigerants cascade refrigeration cycle in the contained cold temperature cycling agents and low-temperature circulating refrigerant system is compact,ralph lauren outlet, the share of the cooling space is small, easy to install and maintain. 4 Conclusion The analysis of CO2 and thermal performance of several commonly used low temperature refrigerant obtained: · energy saving information (1) CO2 low temperature refrigeration system flow resistance is small, loss, low power consumption,hollister online shop, cooling pipes small diameter; (2) co2 low temperature refrigeration systems need refrigerant 'flow is small, filling a small amount; (3) the effect of the evaporator heat transfer, heat transfer area required is small, compact system. CO, low temperature refrigeration systems, saving metal material, the device's small initial investment, low cost, small, while energy consumption,hollister deutschland, save electricity, reduce greenhouse gas emissions,calzoncillos calvin klein, protect the environment. The natural refrigerant CO2 subcritical cycle cryogenic refrigeration system used in commercial refrigeration systems for supermarkets and other low-temperature cycle refrigeration system, with a good prospect of application. References [1] LorentzenG. Theuseofnaturalrefrigerants, acompletesolu-tionto Hill eCFC / HCFCpredicamentlJJ. InternationalJournalofRefrigeration, 1995.18 (3) :190-197 [2] E. F. Gorzelnik. Heatwater Hill yourair-condition-er. ElectricalWorld,abercrombie hamburg, 1977.188 (11): 5455l3] H. J. Laue of. RegionalreportEm-ope: InternationalJournalofRefrigeration,hollister donauzentrum, 2002.25:414420 [4] KitzmillerW. R. Advantagesofco2 of a Ammoniasystemforlow-temperaturerefrigeration [J]. Power, 1932 (1) :92-94 [5jPettersenAJ, JakobsenA. AdIyiceslurrysystemforlowtern-peraturerefrigeration [Aj. InternationalSymposiumonRefrig · erationinSeaTransportTodayandintheFuture [C]. Gdansk, Poland, l994l6] BAXTERV. Advancesinsupermarketrefrigerationsystems [A]. 7 Mountain IntEnergyAgencyConfOnHeatPumpingTeeh-nologies [C]. Beijing, the 2OO2 Shanghai energy conservation, air conditioning and refrigeration industry requirements of the Shanghai Municipal People's Government on August 7,calvin klein, 2007 ,hollister frankfurt, air conditioning and other household and commercial electrical energy-saving projects during the Implementation of the program requirements, focus on cars, air conditioners, refrigerators, fans, pumps and other energy-saving potential, applicable to a wide range of energy products and accelerate the implementation of energy efficiency labeling system, strengthen energy-efficiency labeling supervision and inspection. - (Special correspondent Wang K # t Road) 
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 fuel cell vehicle waste heat driven absorption air conditioning 

 
 methanol working pair in the low temperature heat sources can be better, so in this article focused on several different activated carbon-methanol working fluid pairs studied,mulberry, a variety of workers Quality on the D-A equation parameters in Table 1. Calculations in Table 1, several working fluid on the D-A equation coefficients [6] In order to facilitate the calculation, make the following assumptions: (1) assume that adsorption to the end of the temperature of condensing temperature; (2) assume that the parsing to the end of the temperature with the heat source temperature ; (3) the mass recovery process fully. Based on the above assumptions, the activated carbon-methanol adsorption refrigeration system designed in this paper a simulation, and the final calculation of results visualization. If no special instructions, the following results in the evaporation temperature = 7 ° C, condensing temperature = 35%, or a heat source temperature Th = 80 ° C, the heat capacity than the m = 2, using the calculated YKAC activated carbon-methanol working pair of conditions . It can be seen from Figure 3, after the introduction of mass recovery cycle, the cooling capacity can be found from Figure 4, the mass recovery rate is reduced as the heat source temperature, and the improvement of the adsorbent mass recovery rate is very small. Temperature of hot asphalt l the shoulder temperature SYh, (r) Figure 3 cooling capacity and the heat source temperature of Th (~ C) Figure 4 back to the prime rate and the heat source temperature,abercrombie hamburg, the relationship between heat the fascine temperature Th (COP changes. () Figure 5 a continuous loop in Figure 8No the lower .1,2006,hollister donauzentrum, Mar.Vo1.25 the (T0talNo.94) Figure 7 mass recovery rate with changes in the evaporating temperature and condensing temperature diagram. higher condensing temperature or evaporating temperature can be seen from the figure, that is,hollister euroma2, condensation the greater the temperature difference of the temperature and the evaporation temperature,hollister dortmund, the greater the rate of mass recovery, which is due to the temperature and pressure of the refrigerant is one to one, the greater the temperature difference, the greater the pressure difference,hollister carugate, the mass recovery process is rely on differential pressure to complete the condensation temperature changes compared to the evaporation temperature changes affect the quality of larger Figure 8 is a back loop continuous cycle COP of the system comparison study shows that mass recovery rate, the mass recovery cycle COP of the system changes compared with a continuous loop flat,hollister roma, that is, the evaporation temperature or condensing temperature impact is greatly reduced. Figure 6 mass recovery cycle c0P changes in Figure 4 Conclusion Figure 5 and Figure 6 for the continuous circulation and mass recovery cycle COP change (1) lower the heat source temperature, chemical diagrams. compare the two diagrams, you can see the mass recovery cycle through improved mass recovery rate has little effect; ring COP than continuous cycle generally about 3O% (2) the introduction of the mass recovery the process, than the days of upgrading; 100 ∞ - above 60 twenty 40 plus 0 Figure 7 mass recovery rate and evaporation temperature, the higher the condensing temperature diagram 8 and mass recovery cycle and continuous cycle COP of mass recovery rate; but the COP of the sorbent system performance index too (3) condensing temperature and evaporating temperature the greater the temperature difference, the higher the rate of mass recovery; (4) the handling of the mass recovery,calvin klein, the changes in the external environment impact on system performance is greatly reduced. References [1] Huan new, Tan Xianguang. and Feasibility of utilization of waste heat of fuel cell vehicles [J]. Heating Ventilating air conditioning, 2004,23 (5) :81-84 [2] Qi Zhaohui, Tang GF, Li Dingyu such as adsorption refrigeration in waste heat recovery [J]. China Energy, 2001,hollister hamburg, (4) :30-32l3jWangW XuYX, WangRZ, Discussionaboutsyntheticalef-tofheatregenerationandIIIItBSrecoveryOiladsorptionre-frigerationcycles [A]. Proceedingsofthe4thInt.ConferenceonNewEnergySystemandConversions [C]. OsakaJapan JapanAssociationofRefrigeration.1999: 451-458l4JSzarzynskiS, FengY, PortsM.Studyofdifferentinternalvaportransportsforadsorptiononcycleswithheatregeneration [J]. Int.Jrefrig, 1997,2 O (6) :390-4o1 [5] Wang, such as bamboo. adsorption refrigeration [M] Beijing: Mechanical: death industry Press,calzoncillos calvin klein, 2002 [6] such as bamboo,hollister köln, Dai Wei, Zhou Heng Xiang made activated carbon-methanol adsorption refrigeration performance [J]: Solar Energy, 1995,16 (2): 155] 61 
 

 
 Ertan Hydropower Station transportation hole the wind heat and moisture transfer characteristics of the field test