The compressor is the power source of the heat pump water heater, just like the human heart. The performance and reliability of the heat pump water heater must be guaranteed by the compressor. In recent years, the heat pump water heater market, especially in the household sector, has developed rapidly, but problems gradually emerged after the volume increased.

Although the operating principle of the heat pump water heater is no different from that of the air conditioner, and both use the reverse Carnot cycle principle, there is a huge difference in the operating mode and range of the two. This determines that the heat pump water heater and the air conditioner have different requirements for the compressor. A large number of air-conditioning compressors on the market cannot be used in heat pump water heaters.

1. The air conditioner is a seasonal operating product, mainly used in summer and winter; while the water heater is a daily necessity and needs to be operated throughout the year, and its operating time is much longer than that of the air conditioner. Regardless of other factors, just looking at the operating time, if the heat pump water heater and the air conditioner use the same type of compressor, its actual life will be much shorter.

2. When the air conditioner is in refrigeration operation, the evaporator is indoors, and the air temperature should be controlled at about 25 degrees, which determines that the evaporating temperature of the air conditioner will not be too high. For heat pump water heaters (especially the split machine with the main unit placed outdoors), the temperature of the evaporation environment is the atmospheric temperature, and its evaporation temperature may be much higher than that of the air conditioner during summer operation. The high evaporating temperature results in a large flow rate, which is another important factor for the "overload" of the compressor for heat pump water heaters.

3. The air conditioner runs in the "low load" state most of the time, and the "overload" operation refers to the days when the weather is particularly hot, at which time the condensation temperature may reach the highest value allowed by the compressor (generally 65 degrees) . However, the heat pump water heater is different. In order to obtain the necessary water temperature, the condensing temperature will experience a "highest value" every time it runs. According to the definition of "overload" of air conditioners, heat pump water heaters will be in an "overload" state throughout the year, which is far worse than air conditioners.

4. The air conditioner's operating conditions change as the season changes (both evaporating pressure and condensing pressure change, and the maximum compression ratio generally does not exceed 6), while the heat pump water heater changes only the evaporating pressure, condensing pressure and The water temperature is related and can be said to remain constant throughout the year. The problem is that during winter operation, the compression ratio of heat pump water heaters is much higher than that of air conditioners.

5. People's demand for hot water is more in winter, while the operation of air conditioner is mainly in summer. In winter, the air temperature is low and the compressor runs for a long time. It can be said that the life of the heat pump water heater is mainly consumed in winter operation.

The above differences can be attributed to the following points:

The heat pump water heater has a longer running time;

Heat pump water heaters operate at high condensing temperature (condensing pressure) throughout the year;

Large flow during summer operation;

The pressure ratio is high during winter operation.

Guangdong Hepai New Energy Technology Co., Ltd. is an air energy heat pump manufacturer integrating R&D, production, manufacturing, sales and after-sales service. Main business: Dongguan air energy, heat pump commercial hot water, OEM production, air energy brand joining , Hotline: 13925587576.