What are the characteristics of air source heat pumps

What are the characteristics of air source heat pumps

Features of air source heat pump:

　　1. The air-conditioning system combines cold and heat sources and is placed on the roof of the building. There is no need to set up a special refrigerating machine room and boiler room, and the building space occupied by chimneys and cooling water pipes is also omitted. For buildings in prosperous urban areas with little land and money, or buildings with unconditional boiler rooms, air source heat pump cold and hot water units are undoubtedly a more suitable choice.

　　 2. No cooling water system, no cooling water system power consumption, no cooling water loss. If the air-conditioning system adopts water-cooled chillers, the loss of tap water includes not only evaporation loss, floating water loss, but also sewage loss, winter antifreeze drainage loss, system flushing loss during summer operation, chemical cleaning dilution loss, etc., all of these losses are total The sum is equivalent to 2-5% of the circulating cooling water volume. According to different types of chillers, the loss per unit cooling capacity is 2-4t/100rt.h. This is a considerable amount for some of our cities that are seriously lacking. In addition, a considerable part of the project remains unchanged in the cooling water circulation under partial load. Or according to the number of hosts running, only adjust the corresponding number. Our previous economy paid little attention to this.

　　3. Because there is no boiler, no corresponding fuel supply system, no flue gas, no cooling water, the system is safe, sanitary and simple. For the heating industry, there may be safety hazards in the boiler room z*. In addition, many cases of Legionella infection caused by cooling water pollution have been reported. From the perspective of safety and health, air source heat pumps have obvious advantages.

　　4. The system equipment is small and centralized, and the operation, maintenance and management are simple and convenient. Some small systems can control the switch of the heat pump unit through the start and stop of the indoor fan coil.

　　5. Stand-alone capacity ranges from 3rt to 400rt, with complete specifications and strong engineering adaptability, which is conducive to the detailed division of the system. The system can be set up independently in layers, blocks, and user units.

　　6. ​​The COP value of running in summer is lower than that of water-cooled units, and it consumes more electricity. It saves energy consumption in winter. For general buildings in a city with cold winters and hot summers like Nanjing, the annual energy consumption of the heat pump system is lower than that of the water-cooled unit plus boiler air conditioning system. However, at the current energy prices, the annual operating cost of the heat pump system is higher than that of the water-cooled unit plus boiler. Program.

　　7. Higher cost. As the equipment investment for the cold and heat sources of the air-conditioning system, the cost of the air-source heat pump cold and hot water units is relatively high, which is 20-30% more expensive than the integrated system cost of the water-cooled unit and boiler. For example, only the cold and heat source equipment, heat pump The price is about 1.5-1.7 times that of water chiller + boiler.

　　 8. The air source heat pump chiller and hot water unit is exposed to the outdoors all the year round, and its operating conditions are worse than that of water-cooled chillers, and its service life is correspondingly shorter than that of water-cooled chillers.

　　 9. The noise of the heat pump unit is loud, which has a certain impact on the environment and adjacent rooms. The heat pump is usually placed directly on the podium or top roof, and the effect of vibration isolation and sound insulation directly affects the use of adjacent rooms and some rooms around them. With reasonable location and vibration isolation and sound insulation measures in place, the influence of heat pump noise can be basically eliminated.

　　 10. The performance of the air source heat pump changes significantly with the outdoor climate. The heat pump unit cannot work normally when the outdoor air temperature is higher than 40-45℃ or lower than -10～-15℃.