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1、外文翻译(英文原文)ABSTRACTThe working principles and the basic features of air conditioning water heater (ACWH) system are introduced in this paper. The air conditioning water heater system can operate in five modes: water-heating only, space-cooling and water-heating, space-heating and water-heating, space
2、-cooling, space-heating. Comparatively, the system can provide much better energy performance and higher equipment utilization throughout a year, and cause less thermal pollution than heat pump water heater and common air conditioner. A prototype with five modes was assembled and tested at the ambie
3、nt temperature from -7 to 43, especiallywhen frosting. When it works in the water-heating mode, it can supply 55 hot water within two minutes, and thecondensing pressure is just same with common air conditioner. When some modes switch, the temperature of theoutlet hot water is constant. Theoretical
4、analysis and experimental study were done to the ACWH in this thesis:1. The prototype was tested in the air-conditioner laboratory of GREE. The testing data indicate that the prototypeaccords well with the national standards of air conditioner and heat pump water heater.2. Based on the experimental
5、results, analysis was done on the ACWH in main operating modes and some importantconclusions were given，The results indicate that the new system can save energy through multi-duties, and it can work stably in five workmodes with high efficiency. Compared with other models, the new system also includ
6、es air-conditioning unit andwater heater unit, but with fewer components and higher reliability. Based on common air conditioner, this systemcan offer a practicable solution coupling air conditioner and water heater. It must be changing the markets of bothair conditioner and water heater. 1. INTRODU
7、CTIONThe heat pump water heater (HPWH) has been used since 1950s, mainly for household applications. It absorbs heatenergy from the ambient air to acquire hot water. In the last 20 years, the study intends to design heat pump waterheater with high reliability and practicability, and many manufacture
8、rs turn to offer this production based onenvironmental protection and energy saving. In South Africa, HPWH has penetrated 16 percent of the market sharefor commercial water heaters.Because of the highly primary cost, it is difficult to become the alternative to the common water heater. However, ifwe
9、 can offer an air conditioner coupled with HPWH system, which can act as air conditioner and water heater withthe main components such as heat exchangers, compressor, four-way valve, and capillary tube, the primary cost willbe reduced and it can realize multifunction easily. In summer, with the reco
10、very of the waste heat of condensation, itcan offer “free” hot water, and also can improve the coefficient of performance (COP) of the air conditioner. Whenair conditioner is not required in spring and autumn, it can operate in HPWH mode. As the enhancement of the yearroundutilization, it can be mor
11、e efficient and is expected to become a strategy solving the air conditioning and hotwater applications. Here we demonstrate an air conditioning water heater (ACWH) system, and the performanceanalysis is described in this article.1. THE PRINCIPLE OF ACWHThe schematic diagram of air conditioning wate
12、r heater system is shown in Figure 1. The system can offer thefollowing five operating modes. Mode 1 is only for heating water; mode 2 can act as space-cooling and waterheating;mode 3 can realize both space-heating and water-heating; the other two modes are the same with thecommon air-conditioning c
13、ircles. The switching among all these modes is by means of on-off controls of thesolenoid valves and four-way valve. Each mode will be demonstrated as follows.1.1 Water Heating Mode2.1 Water Heating ModeThe system can operate in two heating modes. The one is direct heating water; the other is heatin
14、g water with waterrecycle in the adiabatic water tank. The controller can adjust the operating mode according to the water level sensorsin the tank. A water valve is placed at the hot water outlet which can be adjusted to control the water flow and keepthe condensing pressure constant. When the tap
15、water goes into the water-refrigerant heat exchanger (WRHE), itwill be heated to 50-55 directly within two minutes. If needed, the outlet water temperature can be set byadjusting the water valve.As shown in Figure 1, when the power is on, the compressor sucks low-pressure refrigerant gas and then di
16、schargeshigh-pressure gas into water-refrigerant heat exchanger (WRHE), where refrigerant is condensed and water is heateddirectly. After heat exchanges, the liquid refrigerant flows across four-way valve, then it is throttled to lowtemperatureand low-pressure liquid and gas by an electronic expansion valve. Refrigerant flows into outdoor aircooledcondenser where it is evaporated and becomes low-pressure gas. When the low-pressure gas returns to thec
