A kind of greenhouse air conditioning system and its regulating method

Abstract

The invention relates to the technical field of greenhouse planting, and discloses a greenhouse temperature regulating system. The greenhouse temperature adjustment system includes a compressor, a four-way reversing valve, a fin heat exchanger, an expansion valve, a casing heat exchanger, a surface cooler, a circulation pump and a liquid storage tank; the compressor passes through the four-way The reversing valve is respectively connected with the casing heat exchanger, the expansion valve, and the fin heat exchanger in sequence to form a heat pump circulation unit. One end of the fin heat exchanger is provided with a centrifugal fan, and the other end is connected with the surface cooler. , one end of the casing heat exchanger and the surface cooler are respectively communicated with the circulation pump, and the other ends are respectively communicated with the liquid storage tank, and the circulation pump is communicated with the liquid storage tank. In the greenhouse air temperature adjustment system provided by the present invention, the heat collection by the heat pump circulation unit is used, and the heat dissipation by the surface cooler and the heat pump circulation unit can be used to improve the heat collection efficiency and prolong the heat collection time, which can greatly increase the thermal energy of the surplus air in the solar greenhouse. Utilization rate, stable and reliable operation.

Description

technical field [0001] The invention relates to the technical field of greenhouse planting, in particular to a greenhouse temperature regulation system, in particular to a greenhouse temperature regulation system capable of improving the utilization efficiency of air heat energy in a solar greenhouse and a regulation method thereof. Background technique [0002] China's solar greenhouse uses solar radiation as the main energy source, and is a representative of energy-saving, high-efficiency, and low-cost greenhouse structure types. By the end of 2012, the national solar greenhouse area was 964,000 hectares, accounting for about 24.9% of the total facility cultivation area. Due to the excellent heat preservation and heat storage performance of the solar greenhouse, between 35° and 42° north latitude in my country, the production of temperature-loving vegetables can generally be carried out without heating in winter. However, for solar greenhouses that have been used for a lo...

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Problems solved by technology

Moreover, the application of air source heat pumps is greatly affected by climatic conditions, and they cannot work normally in winter in cold regions. The main problems are that the heating capacity of heat pumps is too small to meet the heating load of the greenhouse, the coefficient of heating performance is low, and the defrosting accuracy is poor.

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