Micro distributed combined cooling and heating power device and method combining ground heat exchanger

Abstract

The invention discloses a micro distributed combined cooling and heating power device combining a ground heat exchanger. The micro distributed combined cooling and heating power device combining the ground heat exchanger comprises a fuel gas internal combustion generating set, a double-effect lithium bromide absorption heat pump system, a heat consumer water supply and return system, the ground heat exchanger, an air source heat exchanger and a water-water heat exchanger. The exhaust heat of the fuel gas internal combustion generating set drives the double-effect lithium bromide absorption heat pump system; the double-effect lithium bromide absorption heat pump system comprises a high pressure generator, a low pressure generator, an evaporator, a condenser, an absorber and a heat exchangercircularly connected sequentially; the heat consumer water supply and return system is divided into two paths; one path is connected with the condenser to a water supply pipeline; the other path is connected with the evaporator to the water supply pipeline; the water supply pipeline is divided into two paths through an outlet of the evaporator; one path is connected with the ground heat exchangerand the absorber; the other path is connected with the air source heat exchanger; and the two paths are switched to operate so as to form a loop with the evaporator. According to the micro distributed combined cooling and heating power device combining the ground heat exchanger provided by the invention, the comprehensive utilization of a geothermal source and an air source is realized, the utilization efficiency of the absorption heat pump in winter is improved, and the system comprehensive performance is improved.

Description

Technical field [0001] The invention belongs to the technical field of combined cooling, heating and power, in particular to a miniature distributed combined cooling, heating and power device combined with a buried pipe heat exchanger. Background technique [0002] In the building's distributed combined cooling, heating and power system, gas internal combustion engines have been widely used as power generation hosts. Combining waste heat from a gas engine with a lithium bromide absorption heat pump can realize combined cooling, heating and power. The exhaust gas temperature of gas engine is generally around 530℃, which can be used as the driving heat source of waste heat lithium bromide unit; the temperature of cylinder jacket cooling water is between 80 and 120℃, which can be used for single-effect absorption chiller cooling or heat exchanger heating water. In the conventional system, the absorption unit is only used to produce chilled water during the cooling season. When the...

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Problems solved by technology

In the conventional system, the absorption unit is only used to produce chilled water in the cooling season. When the ambient air temperature is lower than 5°C in the heating season, frost will form on the surface of the evaporator and the operating efficiency of the system will decrease.

At this time, if the ambient temperature continues to drop, it cannot meet the heat requirements for the evaporation of the working fluid inside the evaporator, and if the internal vapor pressure is excessively reduced, the lithium bromide solution is very easy to crystallize, which will affect the service life of the system

Therefore, in the heating season, absorption heat pumps generally operate in the form of heat exchangers, and their heat improvement effect has not been effectively exerted

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