Trans-critical carbon dioxide combined cooling, heating and power comfort system based on double four-way reversing valves

Abstract

The invention discloses a trans-critical carbon dioxide combined cooling, heating and power comfort system based on double four-way reversing valves. The trans-critical carbon dioxide combined cooling, heating and power comfort system based on the double four-way reversing valves is composed of a non-azeotropic working medium mechanical undercooling auxiliary system and a trans-critical carbon dioxide refrigeration-heating integrated system. The system further comprises the two four-way reversing valves, a controller, a cache water tank, a domestic hot water tank, indoor fan coiled pipes, radiant floor heating coiled pipes, an expansion water tank and some control valves. Through the use of the two four-way reversing valves, switching control is conducted on the auxiliary system and the trans-critical carbon dioxide system respectively; it is achieved that undercooling of carbon dioxide fluid in winter and summer is met respectively by a set of equipment; the utilization rate of equipment is improved; and systematic energy efficiency is improved conspicuously. Meanwhile, heat on the side of a heat exchanger in the running process of the system is recycled and used for heating domestic hot water; combined cooling, heating and power of air conditioners, heat pumps and water heaters is achieved; the amount and volume of equipment is reduced; and flexibility of energy source utilization is improved.

Description

technical field [0001] The invention relates to the technical field of refrigeration heat pumps, in particular to a transcritical CO pump based on a double four-way reversing valve. 2 A triple power supply comfort system and a control method thereof. Background technique [0002] With the improvement of people's living standards, the requirements for cooling and heating comfort are getting higher and higher, and air conditioning and heating are becoming more and more popular. In order to meet this demand of people, a large number of air conditioners and heat pump products with higher GWP have emerged. Due to the increasingly prominent environmental problems such as global warming and ozone layer depletion, the "Kigali Amendment to the Montreal Protocol" reached in October 2016 proposed to focus on reducing HFC compounds. At the same time, in order to control the serious smog in winter in the northern region, the government proposed to use coal to electricity and other meas...

AI Technical Summary

Problems solved by technology

However, the optimal subcooling degree of mechanical subcooling is high, resulting in the refrigerant and CO in the cooling evaporator 2 There is a large temperature difference between the fluids, resulting in a large irreversible heat transfer loss, which affects the efficiency of the system

[0004] Most of the heating and cooling equipment currently on the market cannot simultaneously supply heating, cooling and domestic hot water at the same time. , At the same time, there is a waste of heat, and the energy consumption of the refrigeration industry is increasing year by year. Therefore, considering the recovery and utilization of heat is also the top priority for the reasonable operation of the system

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