11-21
The general heating method is to directly use energy to heat water. The energy efficiency of electric water heater is about 95%, and that of natural gas is about 75%. The heat pump unit uses electric energy to drive the compressor, not directly used to heat water. The heat energy actually comes from the environment.
05-17
Air energy heat pump (AEHP) is a kind of heat transfer device that uses the inverse Carnot principle to absorb heat from the air to produce hot water. The heat in the environment is transferred to water by allowing the working medium to continuously complete the thermal cycle of evaporation (absorbing the heat in the environment), compression, condensation (releasing heat), throttling and re evaporation. An important parameter to evaluate the performance of heat pumps is heating capacity. What factors affect the heating capacity of heat pumps? 1. Operation mode of hot water system When the system mode of constant temperature water make-up and circulating heating is adopted to make hot water, the actual performance coefficient of the heat pump is reduced by more than 20% compared with the theoretical performance coefficient 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. 2. Circulating water flow and scale From the perspective of most circulating commercial engines on the market at present, due to different pipe resistance losses in actual engineering design, in some engineering systems, the circulating water flow is small, the temperature rise at the heat exchange end is more than 5, and the heat exchange capacity is reduced, so the heat generation capacity of the unit will also be reduced. Scale in pipes and heat exchangers will affect water flow, increase heat resistance of heat exchangers and reduce heat generation of units. Therefore, after working for a certain number of years, the heating capacity of the heat pump unit will decline, and the heating capacity in places with poor water quality will also decline. 3. Impact of climatic conditions When the ambient temperature of the heat pump unit is raised to 5 ℃, its heating capacity can be increased by more than 5% - 20%. Especially in winter, the heating capacity is greatly affected by the temperature. In the design scheme, the heating capacity and performance system under experimental conditions are often taken as the annual average values of heat pump units, and compared with boiler heating and steam holidays to obtain the conclusion of excellent energy saving effect. However, there is a big deviation between this data and the reality, because the impact of climate conditions in different regions is not considered, such as in the north of the Yangtze River basin, The deviation between the annual average energy efficiency of heat pumps and the energy efficiency under nominal conditions may exceed 20%. Then its heating capacity will decrease accordingly.
05-17
With the gradual rise of the air energy heat pump market, more and more factories begin to choose to use air energy heat pumps for heating. The following is a summary of the major issues that should be paid attention to for air energy heat pumps. 1. Equipment installation was not done well Air energy heat pump, as the name implies, needs to absorb the heat in the air to make heat. Therefore, although it does not need to consume coal and natural gas, more attention should be paid to the installation location. Generally, it is recommended that the air energy heat pump be installed in a location with good air circulation, such as outdoor air conditioning position, outdoor platform, etc. These locations not only have strong air circulation, but also have appropriate air temperature, which is more conducive to heat absorption and heating of air energy heat pumps. 2. Clean the defrosting water in time The installation time of the "coal to electricity" project is quite urgent, and sometimes the installation is not very standardized. If the drainage pipe after defrosting is not properly handled, it may cause the water flow after defrosting to the ground, and ice will soon form in cold weather, which will not only inconvenience users to travel, but also damage the unit. Therefore, in this case, the user had better clean up in time, and handle the drainage problem with the assistance of after-sales personnel to eliminate hidden dangers. 3. Insufficient refrigerant of heat pump Refrigerant is commonly known as refrigerant, which is the key material for air energy heat pump heating. To complete the heating of air energy heat pump, the refrigerant must be used as the intermediate to continuously absorb the heat in the air. However, the air energy heat pump has been used for a long time, and refrigerant leakage may occur. Once the amount of refrigerant decreases, the heating capacity of the equipment will naturally decline, which will lead to a significant drop in the temperature of hot water. The solution is very simple. Contact the after-sales service personnel to replenish the refrigerant.
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