Composite heat pump air-conditioning system and its control method for de-energized independent operation

Abstract

The invention discloses a composite heat pump air-conditioning system with de-electricity independent operation and a control method thereof. It solves the problem of poor operation stability of the existing air-conditioning heat pump system. Including the air source heat pump system based on photovoltaic photothermal utilization, the air source heat pump system based on photovoltaic photothermal utilization uses the mechanical energy output by the internal combustion engine as the input energy to provide cooling and heat to the building; the photovoltaic panel of the photovoltaic heat exchanger passes the line and the inverter The transformer controller and battery are connected in turn to form a power generation system to supply power to the system. The waste heat recovery system adopts two waste heat utilization methods. During winter operation, the waste heat is used as a high-temperature heat source to further heat the return water of the system; during summer operation, the waste heat is used as the driving heat source of the lithium bromide absorption refrigeration unit. The invention is a novel green high-efficiency heat pump air-conditioning system with high energy utilization rate, low environmental pollution, low operation cost and stable operation.

Description

technical field [0001] The invention belongs to the technical field of air-conditioning energy-saving equipment, and in particular relates to an off-power independent operation compound heat pump air-conditioning system and a control method thereof. Background technique [0002] With the continuous improvement of people's living standards, people have higher and higher requirements for the comfort and cleanliness of living and working environments. Therefore, buildings in most areas of our country have multiple needs for heating in winter, air conditioning in summer and domestic hot water throughout the year. Although electric heat pumps use various advanced energy-saving technologies in the cooling and heating sources and systems, they have higher However, since most of my country's power grid electricity is supplied by coal-fired power plants, increasing electrical equipment is basically equivalent to increasing environmental pollution. Therefore, from the perspective of im...

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Problems solved by technology

From the currently published data, there are mainly the following ways to realize the independent operation of the gas heat pump system without electricity: 1. The gas engine drives the generator to realize the independent operation of the system [CN201310010199.1]. The rotation speed of the engine is adjusted by changing, so there is a contradiction between the system capacity adjustment and the constant speed of the generator in this method. At the same time, due to the relatively low power generation efficiency of the generator, the energy waste is relatively large; 2. Using solar photovoltaic power generation to realize the independent operation of the system [CN201310365773.5], because most of the solar radiation absorbed by the solar cell is not converted into electrical energy, but increases the temperature of the battery, and the increase of the battery temperature reduces the photoelectric conversion efficiency of the solar cell, so this method exists The contradiction between the photoelectric conversion efficiency and the temperature rise of the battery; at the same time, the end water pump of the gas heat pump consumes more power due to its large power, while solar power generation is greatly affected by the external environment, so it is difficult to ensure that the system is completely independent of the grid; 3 .Comprehensive utilization of photoelectricity, light and heat to realize independent operation of the system [CN 201410222276.4], this patent only describes the method of comprehensive utilization of photoelectricity, light and heat for heating in winter, and does not provide the way of using light, heat and light for cooling in summer, which has certain limitations

[0004] A very important aspect of gas heat pump technology research is waste heat utilization technology. At present, waste heat utilization of gas heat pumps is mainly used for heating or domestic hot water, but in hot summer, there is no need for heat supply and the demand for hot water Relatively little, so a large amount of waste heat cannot be effectively used, and energy waste is very serious

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