As the fourth generation of water heaters, air energy water heaters are gradually emerging, but they are still in the development stage, and users do not know enough about them. This can be seen from the various names. Strictly speaking, air energy water heaters are called air source heat pump water heaters, and there are some wrong names such as air source water heaters, heat pump water heaters, air-conditioning water heaters and even air water heaters.
As a upstart in water heater products, the market position of air energy water heaters has been rising steadily in recent years. More and more users want to try to replace air energy water heaters, 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.
actually, if you know something about the working principle of air conditioners, it is not difficult to understand the working principle of air energy water heaters. The waste heat generated by the air conditioner in the refrigeration process will be radiated into the air through the outdoor unit, while the air energy water heater uses the heat in the air to heat the water. So basically, both of them "carry" the heat in the air by the refrigerant circulation in the compressor and pipeline.
However, the conversion efficiency of air energy water heaters is much higher than that of direct electric heating: 1 kW of electric energy can only generate 1 kW of heat, but 1 kW of electric energy can carry 3-4 kW of heat, which means that the heating efficiency of air energy water heaters is 3-4 times that of ordinary electric water heaters.
to put it more popularly, it's the same as electricity. If an ordinary electric water heater can heat 1 liters of water to a suitable temperature, then an air energy water heater can heat 3-4 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 relatively energy-saving compared with most electric water heaters, and at the same time, the principle of carrying heat also avoids the direct contact between hot water and electricity, so the safety is relatively high. Energy saving and safety, which are also outstanding advantages of air energy water heaters.
Let's use numerical values to calculate the specific energy-saving situation of domestic air energy water heaters:
Calculate the amount of hot water heated by ordinary electric water heaters (15 watts) for 3 hours every day in an ordinary family.
Ordinary electric water heater, heating for 3 hours every day, 15 watts, consumes electricity every year: 1.5*3*365=1642.5 degrees
Air energy water heater, the efficiency is 3-4 times that of ordinary water heater, taking 3.5 as calculation, consumes 1642.5/3.5=469.2 degrees
That is to say,
based on the unit price of an ordinary electric water heater of 2, yuan and an air energy water heater of 5, yuan, 3/74=4.26 years, that is to say, by 4.26 years, the cost of an ordinary electric water heater will be the same as that of an air energy water heater.
if they are used for 8 years, the total cost of air energy is: 8*469.2*.6+5=7252 yuan
The total cost of ordinary electric water heaters is: 8 * 1642.5 * .6+2 = 9884 yuan
Compared with ordinary electric water heaters, air energy can save 9884-7252 yuan. Then the total cost of air energy is: 1*469.2*.6+5=7815 yuan
The total cost of ordinary electric water heater is: 1*1642.5*.6+2=11855 yuan, and the air energy is 11855-7815=44 yuan less than that of ordinary electric water heater.
from the comparison of the above data, it can be seen that although the initial purchase cost of air energy water heaters is relatively high and the one-time investment is large, the cost is lower after long-term use, 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 disadvantages. First of all, the external temperature needs to be suitable for carrying heat, that is, the external temperature should not 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 close to zero or below zero, the efficiency of carrying heat is greatly reduced. However, in winter in northern China, especially 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 the domestic air energy water heater, which becomes an ordinary electric water heater when the outside temperature is very low, avoiding the problem that it cannot be used in cold areas in winter and ensuring all-weather hot water supply all year round. By the way, the series of commercial air energy water heaters of Kohiman can operate in the environment of -25 degrees, and there is basically no limitation of temperature and region.
the second disadvantage is that the process of carrying heat to heat water by air energy water heater is not fast compared with that of electric water heater, which is also the reason why the power of air energy water heater itself is not as big 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, Kohiman air energy water heater is equipped with a special grain wheel compressor for heat pump, which improves the thermal efficiency by 13.8% compared with ordinary compressors, 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. Under normal circumstances, the volume of the water tank of an air energy water heater is generally above 1 liters, even reaching 3 liters, which is equivalent to the size of a refrigerator. The advantage of this is that the water temperature is more constant during use, but the disadvantage is that it takes up more space. If there are two "refrigerators" in a small kitchen, it is estimated that there will be no "foothold".
models with small water tanks are generally split, that is, like traditional air conditioners, there are outdoor units and indoor units, which contain water tanks and 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 is adopted, which saves the trouble of installing external machines and connecting refrigerant pipes. As mentioned earlier, the principle of air energy water heater is similar to that of single cooling air conditioner, so this model can use the discharged cold air to cool 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, these are the advantages and disadvantages of domestic air energy water heaters. As far as energy conservation and environmental protection are concerned, domestic air energy water heater is cost-effective, but its high initial investment can not be ignored. Coupled with factors such as floor space, whether 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 do not have the above shortcomings. For the shortcomings of low temperature, ultra-low temperature air-energy heat pumps can be used. As for the space occupied, it is not a problem for commercial places, but its energy saving is definitely the first choice with great advantages.