Low-temperature refrigerating method using carbon dioxide as circulating working substance and heat pump system thereof

Abstract

The invention relates to a low temperature refrigerating method using carbon dioxide as a cycle fluid and heat pump system thereof belonging to the heat pump refrigerating technology field. The method comprises: expanding the liquid carbon dioxide to solid-gas carbon dioxide two-phase fluid. The solid-gas carbon dioxide two-phase fluid absorbs the heat in a standby refrigerating environment turns out to gas which cooled after turning to high pressure state through compress, turning to liquid. The process is repeatedly cycled to realize the low temperature refrigeration in the standby refrigerating environment. The system comprises an expander, an evaporator, a compressor, a cooler and a pipeline that connects each device integrally to form a one-stage or two-stage low temperature heat pump device; the low temperature heat pump system uses the carbon dioxide as a cycle fluid, which realizes the low temperature refrigeration at -56.6 deg C., at the same time, manages the carbon dioxide in the greenhouse gasses to benefit energy saving and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of heat pump refrigeration, in particular to a low-temperature refrigeration method utilizing carbon dioxide and a novel heat pump technology for realizing low-temperature refrigeration. Background technique: [0002] In recent years, China's economy has continued to grow steadily and rapidly, and energy consumption has also increased significantly. According to statistics in 2006, China's dependence on oil has reached 47%. Among them, energy consumption for people's livelihood and buildings occupies a large proportion; and in this part of consumption, energy consumption for refrigeration and air conditioning accounts for about 30-50%. Therefore, energy-saving technology for this part is very important. Heat pump technology is an advanced energy-saving technology with great potential. It can be widely used in people's livelihood and buildings to provide refrigeration, air conditioning and heating, etc., and...

AI Technical Summary

Problems solved by technology

In these refrigeration methods, gas-liquid two-phase working medium is commonly used, so the refrigeration temperature it can achieve is relatively limited, and can only be above -20°C

At the same time, most of the circulating working fluids used will also destroy the ozone layer and cause global warming

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