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Brief introduction Water ring heat pump air conditioning system advantages and disadvantages
Abstract: The history and present situation of water ring heat pump air conditioning system in our country are introduced. The working principle and application of water ring heat pump air conditioning system are briefly introduced. The advantages and disadvantages of water ring heat pump air conditioning system are analyzed emphatically. Keywords: water ring heat pump water / air heat pump energy saving 0 Introduction Heat pump is essentially a heat recovery device, which absorbs heat from the low-temperature heat source and improve the grade, and then heat at high temperature heat source, save high energy Rent. Since 1989, the application and development of heat pump technology in China has entered a booming period. According to statistics, in 1996, the total cooling capacity of air-conditioning equipment (electric chiller-heater units, absorption chiller-heater units, room air conditioners and unit air conditioning units, but excluding imported units) is about 20 million kW, of which the heat pump The cooling capacity of the unit accounts for about 60% [1]. In the early 1980s, China adopted a water ring heat pump air conditioning system in some foreign-invested buildings [2]. Today, the water ring heat pump air conditioning system in our application has been no small popularity. Water ring heat pump air conditioning system in the 90's in China has been widely used. According to statistics, a total of 52 projects were adopted in China in 1997 [2]. Not only it has been adopted by some projects in big cities such as Beijing, Shanghai, Guangzhou, Shenzhen and Tianjin, but also small and medium-sized cities such as Foshan, Shaoxing, Huizhou and Quanzhou have begun to adopt water-ring heat pump air-conditioning systems. In addition, the research on water-ring heat pump air-conditioning system is also fruitful. From 1993 onwards, the original Harbin Institute of Construction began the water ring heat pump air conditioning system in our application of predictive analysis and evaluation. After that, many related papers were published, such as the literature [3]. In 2005, domestic water ring heat pump air conditioning system engineering monograph, namely literature [4] - "water ring heat pump air conditioning system design" published. A water ring heat pump air conditioning system overview Water ring heat pump air conditioning system is a small water / air heat pump unit application, that is, the water loop will be small water / heat pump unit connected in parallel to form a closed loop, constitute A set of recovery of waste heat inside the building as its low heat source heat pump heating, cooling air conditioning system. A typical water ring heat pump air conditioning system consists of three parts: (1) indoor small water / air heat pump units; (2) water cycle; (3) auxiliary equipment (such as cooling towers, heating equipment, thermal storage devices, etc.). Water ring heat pump air conditioning system's basic working principle is: in the water / air heat pump unit heating to the water cycle loop water heating source; unit cooling, the water as a heat source. When the water ring heat pump air conditioning system heating operation heat absorption is less than the heating operation of the heat release, the water temperature in the loop increases, to a certain extent, the use of cooling tower release heat; the other hand, the temperature of the water loop loop Reduce, to a certain extent through the auxiliary heating equipment to absorb heat. Only when the heat capacity of the heating operation of the water / air heat pump unit is substantially equal to the heat release of the cooling operation, can the water in the circulation loop be maintained within a certain temperature range and the system operates efficiently at this time. 2 water ring heat pump air conditioning system advantages The early 1980s in China some of the water ring heat pump air conditioning system has shown many advantages: such as the unique features of recycling waste heat; unlike the traditional boiler that will pollute the environment; Save or reduce the conventional air-conditioning system, cold and heat source equipment and room; easy to household metering and billing; easy to install, manage and so on. According to the predictions of the literature, a promising energy-saving air-conditioning system for water-ring heat pump air-conditioning systems [2]. In the following, this article analyzes the advantages of water-ring heat pump air-conditioning systems one by one from the three aspects that make up the system. 2.1 water cycle loop First of all, according to water ring heat pump air conditioning system in buildings, it belongs to heat recovery heat pump system. In the case of low outdoor air temperature, the building's peripheral area requires additional heat to maintain a stable and comfortable indoor temperature; at the same time, the inner area of ​​the building is cooled down by indoor heat sources (such as lighting, equipment, and human body) ), But need to reduce the indoor temperature. Water ring heat pump air conditioning system can transfer the waste heat generated in the inner zone to the peripheral zone by connecting the water circulation loop in the peripheral zone and the inner zone of the building at the same time and heat the peripheral zone while cooling the inner zone but does not exist or A small amount of conventional air conditioning system in the same situation of heat and energy offset by the waste of energy. Therefore, the system of building heat recovery effect, make full use of waste heat while saving energy. When the inside of the building is operated at the same time by the heating condition unit and the cooling condition unit mode, the running cost of the water ring heat pump air conditioning system can be reduced to about 50% at most. Second, similar to the above, in order to achieve the same effect of cooling and heating, the water circulation loop of the water ring heat pump air-conditioning system is still two-pipe system, compared with the conventional air-conditioning system which needs the expensive four-pipe fan coil system. In this way, the conventional four-tube fan coil system will not exist or reduce the heat and heat offset in the room air conditioners requiring different conditions, thereby avoiding the unnecessary consumption of energy and saving the piping system The initial investment costs. Again, because the temperature of the water in the water cycle is at ambient temperature, with its ambient temperature