Hot water supply system and method

Abstract

The invention relates to a hot water supply system and a method. The hot water supply system comprises a vapor compression type heat pump circulation subsystem and a fuel cell power generation subsystem. The vapor compression type heat pump circulation subsystem comprises a compressor, a condenser, a throttle valve and an evaporator, and the fuel cell power generation subsystem comprises a reformation and hydrogen production device, a fuel cell, a heat exchange device and a circulating pump. The reformation and hydrogen production device takes natural gas as raw material for preparing hydrogen; the fuel cell takes reformed hydrogen as fuel for carrying out the power generation for supplying direct current and by-product heat; furthermore, the heat exchange device takes cooling water of the fuel cell as high-temperature fluid and takes water from an outlet of the condenser as low-temperature fluid for carrying out heat exchange, so as to improve the temperature of water supplied by the hot water system and significantly improve the energy efficiency of the hot water supply system. The hot water system of the embodiment has significant advantages of cleanness and high efficiency, and the heat supply coefficient thereof is also higher than the heat supply coefficient of the existing vapor compression type heat pump circulation hot water system which takes electricity of a power grid as the power.

Description

technical field [0001] The invention relates to a hot water supply system and method, in particular to a hot water supply system and method composed of a fuel cell and a vapor compression heat pump. Background technique [0002] With the rise of global energy prices and the increasingly prominent ecological and environmental problems, new energy technologies characterized by high efficiency and cleanliness have become a field of research and development that countries around the world are competing to invest in. The new technology of the hydrogen source system can cleanly and efficiently convert biomass energy and fossil energy into hydrogen energy, while the integrated fuel cell can cleanly and efficiently convert hydrogen energy into electricity and by-product heat energy. It can be seen that hydrogen energy and fuel cells will become a new bridge between various primary energy sources and various terminal energy sources. [0003] Hydrogen is a secondary energy source con...

AI Technical Summary

Problems solved by technology

However, the heat supply coefficient (COP), that is, the energy efficiency of the hot water supply system of the vapor compression heat pump cycle technology is greatly affected by the operating temperature of the evaporator, that is, the temperature of the heat source, and the operating temperature of the condenser, that is, the temperature of the hot water.

For air source heat pumps, as the temperature drops in winter, the operating temperature of the evaporator of the heat pump cycle will drop, which will cause the COP of the heat pump system, that is, the energy efficiency to decrease.

[0005] In addition, the compressor of the existing vapor compression heat pump cycle technology is driven by grid electricity, so its primary energy efficiency is also restricted by the power generation efficiency of the grid user end

When the compressor adopts frequency modulation control, since the AC power of the grid needs to be rectified into DC power, there will be rectification loss

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