In recent years, under the guidance and promotion of the national clean heating policy, air-cooled heat pump heating has entered an explosive growth. The reason why air-cooled heat pumps stand out among many heating equipment is inseparable from the characteristics of air-cooled heat pump equipment.
First of all, the air-cooled heat pump can adapt to a wide range of conditions, as long as there is a certain outdoor area, whether it is on the ground or on the roof, and it is easy to install, it only needs to install water pumps and water supplement equipment in a simple computer room; secondly, the heating construction cost is lower, the cost per square meter of heating area About 40-50 yuan, the heating cost is acceptable, most cities can achieve heating break-even under the conditions of residential electricity prices; the most important thing is the mature application of jet-enhanced ultra-low temperature air-cooled units in recent years, which overcomes conventional air cooling. The disadvantages that the unit cannot be used or the effect is not good when the temperature is below -10℃ has promoted the widespread application of air-cooled heat pumps.
There are many manufacturers of air-cooled heat pumps. Choosing a suitable air-cooled heat pump product is very important to the construction and operating costs of a heating project. Based on the experience of using multiple products in multiple projects, I have summarized the standard experience of selecting air-cooled heat pump products. For reference:
1. Is it necessary to use ultra-low temperature jet enthalpy unit?
Everyone knows that the operating temperature of ultra-low temperature jet enthalpy unit is -20℃ or -25℃. Is it possible to use conventional air-cooled heat pump units in areas where the lowest temperature in winter is above -10℃? I recommend using ultra-low temperature jet enthalpy unit. The reason is that the output and energy efficiency of ultra-low temperature jet enthalpy generators at low temperatures (such as -5°C) are superior to ordinary units, about 10% to 20% higher, and the price difference between ultra-low temperature jet enthalpy generators and ordinary units is increasing. The smaller it is, the faster it can be reversed in later operations.
2. Air-cooled heat pump defrost mode selection
During operation, the operating efficiency of the air-cooled heat pump is far below the manufacturer's nominal value. The defrosting loss is very important. This part of the heat loss may account for 10% to 20% of the total heat. The defrosting control mode varies from manufacturer to manufacturer. Choose the product You must pay attention to this aspect. I think that the fin temperature and the refrigerant evaporation temperature are a good defrosting control method. This method accurately grasps the effect of frosting on heat transfer, and also pays attention to defrosting. Exit time.
3. Group control mode of air-cooled heat pump units
A good unit temperature group control method is to use the system water outlet pipe temperature to control the unit start and stop, and each unit compressor is controlled separately, that is, all unit compressors are only turned on when it is turned on, and then the other compressor is turned on after one round. , It remains even when the load is reduced. It is not possible to turn on or turn off all the compressors of a unit, so as to ensure the stable and efficient water temperature of the system. Some manufacturers use a single unit backwater control, which may cause all units to be turned on and off at the same time, causing system water temperature fluctuations, heating quality cannot be guaranteed, and efficiency is also low.
Fourth, the choice of air-cooled heat pump brands
We should try our best to choose brands with long production time, high market share, and high social reputation. After all, air-cooled heat pump products have high technical content. Without certain technical strength, certain production and use experience, it is impossible to make reliable and stable products. Some small manufacturers say that I use the same accessories and products of the XX brand. I must not believe this.
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