Publish Time: 2023-09-13 Origin: Site
Air to water heat pump is a heat transfer device that utilizes the inverse Carnot principle to absorb heat from the air to produce hot water. By continuously evaporating (absorbing heat from the environment), compressing (releasing heat), throttling, and re evaporating the working fluid, the heat from the environment is transferred to water. An important parameter for evaluating the performance of heat pumps is the heating capacity. So, what factors affect the heating capacity of heat pumps
When the system mode of constant temperature water supplement and circulating heating is adopted to produce hot water, the actual Coefficient of performance of the heat pump is more than 20% lower than the theoretical Coefficient of performance of the direct heating system heated from cold water to hot water because the heat pump unit in the system has been working at medium and high water temperatures. It is precisely due to the lack of direct heat control technology that the actual energy-saving effects of many heat pump hot water projects are affected
The Heat Pump Water Heater for Commercial, Industrial and Similar Purposes (hereinafter referred to as the national standard for commercial machines) clearly states that for the water heater that does not provide a water pump, the laboratory will select a water pump for it, so that the temperature of the heat exchange end of the circulating water will rise by 5 ℃ under the nominal heating capacity of the unit. From the perspective of most circulating commercial machines on the market at present, due to the difference in the size of the Friction loss of the pipeline in the actual engineering design, In some engineering systems, the circulating water flow rate is small, and the temperature rise at the heat exchange end exceeds 5, resulting in a decrease in heat exchange capacity and a decrease in the heating capacity of the unit. Scale in pipelines and heat exchangers can affect water flow, increase heat resistance of the heat exchanger, and reduce unit heating capacity. So after working for a certain number of years, the heating capacity of the heat pump unit will decrease, and the heating capacity in areas with poor water quality will also decrease
When the ambient temperature of the heat pump unit reaches 5 ℃, its heating capacity can correspondingly increase by more than 5% -20%, especially in winter, where the heating capacity is greatly affected by temperature. When designing schemes, the heating capacity and performance system under experimental conditions are often taken as the annual average values of heat pump units, and compared with electric water heaters and gas water heaters to obtain the conclusion of excellent energy-saving effects. However, this data has a significant deviation from reality because it does not consider the impact of climate conditions in different regions The deviation between the annual average energy efficiency of heat pumps and the nominal operating efficiency may exceed 20%.
The household air source heat pump is a kind of energy saving HVAC equipment, it use the heat pump technology for house heating and cooling, it also can use for pool heating and hot water.
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