Greenhouse air temperature adjusting system and adjusting method

Abstract

The invention relates to the technical field of greenhouse planting, and discloses a greenhouse air temperature adjusting system. The greenhouse air temperature adjusting system comprises a compressor, a four-way reversing valve, a fin type heat exchanger, an expansion valve, a double-pipe heat exchanger, a surface air cooler, a circulating pump and a liquid storage pond. The compressor is sequentially connected with the double-pipe heat exchanger, the expansion valve and the fin type heat exchanger through the four-way reversing valve to form a heat pump circulating unit, a centrifugal fan is arranged at one end of the fin type heat exchanger, the other end of the fin type heat exchanger is connected with the surface air cooler, one end of the double-pipe heat exchanger and one end of the surface air cooler are communicated with the circulating pump, the other end of the double-pipe heat exchanger and the other end of the surface air cooler are communicated with the liquid storage pond, and the circulating pump is communicated with the liquid storage pond. In the greenhouse air temperature adjusting system, the heat pump circulating unit is utilized for collecting heat, the surface air cooler and the heat pump circulating unit are used for heat radiation, heat collecting efficiency can be improved, heat collecting time can be prolonged, the utilization rate of surplus air heat energy in a solar greenhouse can be greatly improved, and running is stable and reliable.

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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