Can the air energy water heater keep warm? What are the advantages and disadvantages of air energy water heaters?

As the fourth generation water heater, air energy water heater has gradually emerged, but it is still in the development stage, and users don't know enough about it. This can be seen from various names. Strictly speaking, air energy water heater is called air source heat pump water heater, and there are some wrong names such as air source water heater, heat pump water heater, air conditioning water heater and even air water heater.

As a upstart among water heater products, the market position of air energy water heater has been rising steadily in recent years. More and more users want to try to replace the air energy water heater, but they haven't started because they don't know enough. So Kohiman will introduce the advantages and disadvantages of domestic air energy water heaters, and first briefly introduce the principle of air energy water heaters.

In fact, if you know the working principle of air conditioner, it is not difficult to understand the working principle of air energy water heater. The waste heat generated by air conditioner in the refrigeration process will be emitted into the air through the outdoor unit, while the air energy water heater uses the heat in the air to heat water. So basically, both of them rely on the refrigerant circulation in the compressor and pipeline to "carry" the heat in the air to achieve their goals.

However, the conversion efficiency of air energy water heaters is much higher than that of direct electric heating: 1 kW electric energy can only generate 1 kW heat, but 1 kW electric energy can carry 3-4 kW heat, which means that the heating efficiency of air energy water heaters is 3-4 times that of ordinary electric water heaters.

In layman's terms, it is the same as electricity. If an ordinary electric water heater can heat 10 liter of water to a suitable temperature, then an air energy water heater can heat 30-40 liters of water. On the other hand, when the same water is heated to the same temperature, the electricity used by the air energy water heater is 1/3- 1/4 of that of the ordinary electric water heater, so the air energy water heater is more energy-saving compared with most electric water heaters, and the principle of carrying heat also avoids the direct contact between hot water and electricity, so the safety is higher. Energy saving and safety, which is also the outstanding advantage of air energy water heater.

The following values are used to calculate the specific energy saving situation of domestic air energy water heaters:

Calculated by the amount of hot water that ordinary electric water heaters (1500 watts) heat for 3 hours every day in ordinary households.

Ordinary electric water heater, heating for 3 hours every day, 1500 watts, annual power consumption: 1.5*3*365= 1642.5 degrees.

The efficiency of air energy water heater is 3-4 times that of ordinary water heater. If calculated by 3.5, the annual power consumption is 1642.5/3.5=469.2 degrees.

That is to say, if the same hot water is generated, the air can be saved every year1642.5-469.2 =1173.3 degrees, and the electricity bill can be saved by 704 yuan at the unit price in 0.6 yuan.

Based on the unit price of 2000 yuan for ordinary electric water heater and 5000 yuan for air energy water heater, 3000/704=4.26 years, that is to say, by 4.26 years, the cost of ordinary electric water heater will be the same as that of air energy water heater.

If it is used for 8 years, the total cost of air energy is: 8*469.2*0.6+5000=7252 yuan.

The total cost of ordinary electric water heater is: 8 * 1642.5 * 0.6+2000 = 9884 yuan.

Compared with ordinary electric water heaters, air energy can save 9884-7252=2632 yuan.

If 10 year is used, the total cost of air energy is:10 * 469.2 * 0.6+5000 = 7815 yuan.

The total cost of an ordinary electric water heater is10 *1642.5 * 0.6+2000 =11855 yuan, and the air energy is less than that of an ordinary electric water heater11855-78/.

From the comparison of the above data, it can be seen that although the initial purchase cost of air energy water heater is high and the one-time investment is large, the long-term use cost is low, and the longer it takes, the more cost-effective it is. Therefore, in terms of energy saving alone, air energy water heaters are more cost-effective.

But the air energy water heater is not without its shortcomings. First of all, the outside temperature is suitable for carrying heat, that is, the outside temperature cannot be too low. Ordinary air energy water heater, if the outside temperature is very low, then the efficiency of carrying heat is very low. Generally, when the temperature is near zero or below zero, the efficiency of carrying heat is greatly reduced. However, in northern China, especially in winter in northeast and northwest China, there are many hot water, but the efficiency of air energy water heaters is not high at this time; The south is much better, even in winter, the outside temperature will not be very low, so it is more suitable for air energy water heaters.

In order to solve this shortcoming of domestic air energy water heater, many heat pump manufacturers set up electric auxiliary heating function in domestic air energy water heater, which becomes an ordinary electric water heater when the outside temperature is very low, avoiding the problem that it can not be used in cold areas in winter and ensuring all-weather hot water supply all year round. By the way, Kohiman's series of commercial air energy water heaters can operate in the environment of -25 degrees, basically without temperature and geographical restrictions.

The second disadvantage is that the process of heating water by air energy water heater with heat is not fast compared with electric water heater, which is also the reason why the power of air energy water heater itself is not as large as that of ordinary electric water heater. Heat is a slow accumulation process, so it is difficult for air energy water heaters to use hot water immediately after heating, and there must be a water tank to store water. At present, Cushman air energy water heater is equipped with special grain wheel compressor for heat pump, which improves the thermal efficiency by 130.8% compared with ordinary compressor, operates efficiently in all seasons and performs well in winter.

The third disadvantage is that the domestic air energy water heater occupies a relatively large area. In general, the water tank volume of an air energy water heater is generally above 100 liter, even reaching 300 liters, which is equivalent to the size of a refrigerator. The advantage of this is that the water temperature is more constant during use, and the disadvantage is that it takes up more space. If there are two refrigerators in a small kitchen, it is estimated that there is no place to stand.

Models with small water tanks are generally split, that is, like traditional air conditioners, there are outdoor units and indoor units with water tanks inside, which can be installed on the load-bearing walls of bathrooms or kitchens. The advantages of split type are flexibility and small size, and the outdoor unit does not occupy indoor space. However, large-capacity models are generally integrated, and the integrated small-volume design saves the trouble of installing external machines and connecting refrigerant pipes. As mentioned above, the principle of air energy water heater is similar to that of single cooling air conditioner, so this mode can use the discharged cold air to refrigerate or dehumidify the room in summer, killing two birds with one stone. At the same time, the huge capacity can meet the all-weather hot water supply of large-sized houses and villas.

To sum up, the advantages and disadvantages of domestic air energy water heaters are these. As far as energy conservation and environmental protection are concerned, domestic air energy water heaters are cost-effective, but their high initial investment can not be ignored. Coupled with factors such as floor space, whether the air energy water heater is suitable for installation in your home depends on your own comparative analysis. If hotels, hotels, schools, hospitals, swimming pools and other commercial spaces have a large demand for hot water, commercial air energy water heaters will not have the above shortcomings. For the disadvantage of low temperature, ultra-low temperature air energy heat pump can be used. As for occupying space, it is not a problem for commercial places, but its energy saving is definitely the first choice and has great advantages.