Air Source Heat Pump Applications
An overview of In accordance with the “language of heating ventilation and air conditioning technology standard” (GB50155-92), Heat Pump Is defined as the evaporator and condenser to achieve conversion of the cooler features. We can also called reverse Carnot cycle heat pump principle based on the work of both can be used to refrigeration, it can be used to heating units. Variety of heat pump classification, if the press with a heat pump evaporator and condenser heat transfer medium in different categories, heat pumps can be divided into: air – air heat pump, air – water heat pump, water – water heat pump, water – air heat pump, soil – Air heat pump, and soil – water pump and so on. In which the air – water heat pump, that air-source heat pump water heater unit in engineering more widely used.
Heat pump research, production and application of seventies of the twentieth century began in the United States and other developed countries take the road of healthy development. China in Shanghai in 1980 to design and production of the first to R12 as working fluid, air compressor power 55KW? Water heat pump, and put into practical engineering application. Has been the late eighties to the twentieth century, air-source heat pump research, production and application in China have developed quickly. At first, application of heat pump works mainly to set the conditions for the boiler or no price premium is too expensive or non-chilling room of the building space available for only a few selected units imported brands, compare the form of a single unit, mostly for piston compression Integral air-cooled heat pump units. Heat pump works in recent years, both in geographical or architectural features and scale in all the major breakthrough, the brand of heat pump units, type of options greatly expanded, both in many imported brands, and numerous Domestic brands have piston compression heat pump units, there are screw-type unit, with integral unit, but also modular heat pump units, single-unit cooling capacity from 3RT-400RT, everything, and the unit’s cooling and heating performance, quality and reliability are improved significantly.
2, heat pump features Air source heat pump has the following characteristics:
1, Air Conditioning System in one, and placed on the building roof, no need to set a special freezing room, boiler room, but also eliminates the need for chimneys and cooling building space occupied by water pipes.
Busy section of the city for the high cost of land building, or unconditionally set the boiler room building, air source heat pump is certainly a more appropriate choice.
2, no cooling water system, no cooling water system power consumption, no cooling water loss.
Air conditioning systems, such as using water-cooled chillers, evaporative water loss is not only the loss, leaching losses, as well as the sewage damage, water loss in winter frost, Xia Jiqi flush with the system when the loss, diluted loss chemical cleaning, etc., all The total loss of cooling water circulation of water about equal to 2? 5%, depending on the nature of chillers, cooling capacity equivalent to the loss of unit volume 2-4t/100RT? h. This is some of our serious lack of the city, is a relatively substantial amount. Moreover, a considerable part of the project under part load conditions remain the same volume of cooling water. Or according to the number of host operating units, only a few units for the corresponding adjustment. Our economy is relatively little previous attention to this.
3, since no boiler, no corresponding fuel supply system, no smoke, no cooling water system security, health, simple.
Road for warm professional, the boiler room with a possible security risk, In addition, the formation of the cooling water Legionella infections has been written, from the perspective of health and safety, air source heat pump has a clear advantage.
4, less and focus on system equipment, operation, maintenance and management simple and convenient. Small systems can do the start-stop control by indoor fan coil heat pump switches.
5, unit capacity from 3RT to 400RT, specifications, engineering adaptability, which will help refine classification system can be hierarchical, block, sub-systems, user element independent set.
6, summer, water-cooled unit is running lower than the COP value, more power, the winter run to save energy consumption. Nanjing this summer and cold winter for the city’s general building heat, the heat pump system of annual energy consumption of the boiler below the water-cooled unit plus air-conditioning system, but at current energy prices, the annual running costs of heat pump system than water cooling unit plus boiler program.
7, cost more. As a source of hot and cold air conditioning system’s investment in equipment, air source heat pump costs higher than the boiler water-cooled unit plus cost of the program’s system integration cost 20? 30% have only a cold source such as equipment, heat pump prices about water-cooled machine + boiler 1.5-1.7 times.
8, air source heat pump year-round exposure to the outdoors, operating conditions worse than the water-cooled chiller and its corresponding life expectancy shorter than that of water-cooled chiller.
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