A domestic heat pump water heater system and heating method

Abstract

The invention discloses a domestic heat pump water heater system which comprises a compressor, an indoor condenser, an electronic expansion valve, an outdoor evaporator, a methyl alcohol water storage container, a conveying pump, a reformer, a fuel cell, a power conversion system and an air and residual air mixer.The reformer generates high-temperature residual air and exhausts the residual air to the air and residual air mixer.The air and residual air mixer is used for mixing outside air and the high-temperature residual air to form intermediate-temperature mixed air at the temperature of 20-70 DEG C to be conveyed to the outdoor evaporator.The fuel cell is used for an electrochemical reaction of hydrogen and oxygen and generates and outputs electric energy.The power conversion system is used for converting electric energy output by the fuel cell into electricity needed by loads and supplying electricity to the compressor, the conveying pump and a motor home motor.According to the non-continuous trapezoid longitudinal rib tube, no geographic restriction exists, the domestic heat pump water heater system can still work normally and efficiently when the temperature of outdoor air is smaller than zero, the outdoor evaporator will not be frosted, regular defrosting is not needed, heat of high-temperature residual air and heat of external air can be utilized at the same time, and energy conservation and electricity conservation are better achieved.

Description

technical field [0001] The invention relates to the technical field of water heaters, in particular to a household heat pump water heater system and a heating method. Background technique [0002] As non-renewable energy sources such as coal, oil, and natural gas become less and less, domestic air-energy heat pump water heaters with very small power consumption have emerged as the times require. The principle of household air source heat pump is to use the inverse Carnot principle. The outdoor evaporator absorbs heat from the ambient heat in the outdoor air to evaporate the heat transfer medium. When the evaporator condenses into a liquid, the released heat is transferred to the water, and the condensed heat transfer working fluid returns to the outdoor evaporator through the expansion valve, and then evaporates again, and so on. [0003] However, the disadvantage of household air source heat pumps is that the lower the outdoor air temperature, the smaller the heat supply, ...

AI Technical Summary

Problems solved by technology

[0003] However, the disadvantage of household air source heat pumps is that the lower the outdoor air temperature, the smaller the heat supply, especially when the outdoor air temperature is lower than zero, the heat pump is difficult to work normally, and electricity or other auxiliary heat sources are needed to heat the air. The efficiency of the heat pump is greatly reduced, and when the outdoor air temperature is below zero, frost will form on the outdoor evaporator of the air source heat pump, and regular defrosting is required. After adding a defrosting module to the air source heat pump, not only the stability is reduced, but also the maintenance cost increases, and also loses a considerable amount of energy

In addition, the power source of existing heat pump water heaters is usually the mains, so the use of existing heat pump water heaters is subject to relatively large geographical restrictions

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