Now we popularize energy saving products favored by consumers. Air source heat pump water heaters accepted by consumers by it’s energy saving, safety, environmental protection, etc. Although the air source heat pump water heater is a very energy-efficient products, but if the the unit match, installation, warm-keeping and other aspects of the design unreasonable, then, make energy-saving effect greatly reduced.
1.Heat pump unit and water tank.
It is very important to Match the host and the water tank. Take residential type for example: a small tank with a large host, make the investment cost too large, an increase of one-time investment costs, but the host reduced working hours, have greatly prolonged the life of the host; a small host with large tank, this configuration can reduce costs, but the host will be significantly lengthened, it will affect the longevity of the host. For example, There is big difference in price between 0.75KW host with 300L water tank and 1.57KW host with 300L water tank. As a result, the small host working time significantly longer especially in the winter.
So that will need electric auxiliary, many users feel the electricity costs almost same as electrical water heater. Therefore, electricity auxiliary in water tank, can reduce one-time cost, but the costs will be increased, not only lose their energy-saving effect, but also compromise the securit. In fact, household heat pump in the case of a reasonable match will not use electricity auxiliary.Such as 0.75KW with 100-150L water tank, 1.57KW units with 200-500L water tank, so that both prolong the life of the host really achieve the use of heat pump water heaters energy saving, environmental protection, safety performance.
2 heat pump projcet installation.
Engineering, installation methods also affect the energy saving effect of the heat pump. There is two different way from the use, one is 24 hours supply and another is regular water supply, 24 hours supply is mainly used in hotels, hospitals and other places, regular supply is mainly used in schools, factories and other places
Regular water supply installation is simple. Just need two circulation pipes to heat between host and water tank, hot water after a particular time used up then re-add cold water into water tank to be reheated. This installation method is very energy-efficient.
There is more ways installation for 24 hours supply, such as direct thermal, cycle type and big small water tanks.
Direct thermal type is cold water turn into hot water after passing through the host directly, the water temperature can reach between 45-65 ℃ . This principle is to control the filling water through a throttling device, water flow can not fill the entire heat exchanger, so must consider the diameter of the heat exchanger not be too big to go through, repeated testing must be done to select the most reasonable diameter.
Cycle heating is the water in water tank heated by cycling, will fill up the water tank with cold water after checking automaticly there is not enough water, and then re-cycle to reach the setting termperature, this installation is relatively easy.
Big/small water tank: small water tank heated to be a certain temperature, then move all the water from small water tank to big water tank, fill up small tank with cold water, continuous cycle, until the large tank filled with hot water. This method in the control relatively complex, but not a high temperature heating phenomenon like a cycle heating in the host. Therefore, the energy saving effect is relatively high.
3.Business project warm-keeping.
There is Pipe and tank insulation. There are two kinds of insulation in water pipe insulation cotton or polyurethane foam. Small diameter generally use cotton insulation, large tubes use polyurethane foam insulation. In the lower ambient temperature, the temperature drop was particularly severe, if there is backwater system, but not warm-keeping to water supply pipe and back water pipes, energy efficiency will be drastically reduced. Tank insulation is also important, stainless steel water tank insulation under normal circumstances, with
In conclusion, it is no doubt about the energy-saving of air source heat pump water heater, but there are factors of matching, installation, warm-keeping, will affect the energy saving. So must pay more attention on above questions, can make the air source heat pump water heater performance excellent.
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