Combined cooling and heating system with clean heat energy defrosting function and control method

Abstract

The invention discloses a combined cooling and heating system with a clean heat energy defrosting function and a control method, and belongs to the technical field of heat pumps. The system comprises a solar water heater, a heat pump unit and a tail end system, wherein the solar water heater comprises a heat collector and a heat collection water tank, and the tail end system comprises a water using terminal and a circulation terminal; a heat supply port and a water return port are formed in the condensation end of the heat pump unit, and the heat supply port and the water return port communicate with a circulation terminal in the tail end system through a water outlet pipe and a water return pipe to form a circulation loop. a heat exchange coil pipe is arranged in the heat collection water tank, and a defrosting coil pipe is arranged at the evaporation end of the heat pump unit; the defrosting coil pipe communicates with the heat exchange coil pipe through a defrosting circulating pipeline; and the heat collection water tank is connected with the water using terminal through a water supply pipe I. Solar energy can be fully utilized for defrosting, and the problem that indoor comfort is affected by reverse circulation defrosting of air energy in winter is effectively solved.

Description

technical field [0001] The invention relates to the technical field of heat pumps, in particular to a clean heat energy defrosting combined cooling and heating system and a control method. Background technique [0002] With the rapid development of society, the shortage of conventional energy and the increasingly serious problems of environmental pollution, the development and utilization of new energy, especially clean energy, has been paid more and more attention. Solar energy has the characteristics of wide distribution, safety and environmental protection, and is an inexhaustible renewable energy source. However, due to the influence of weather and other natural conditions, relying entirely on solar energy for heating has certain limitations, so auxiliary heat energy is indispensable in the heating system, and using air heat energy to supplement heat is a very common auxiliary heating method. [0003] However, air source heat pumps are prone to frosting problems when th...

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Problems solved by technology

However, due to the influence of weather and other natural conditions, relying entirely on solar energy for heating has certain limitations, so auxiliary heat energy is indispensable in the heating system, and using air heat energy to supplement heat is a very common auxiliary heating method

[0003] However, air source heat pumps are prone to frosting problems when they are running in winter. The formation of frost layer not only increases the heat conduction resistance of the surface of the heat exchanger, which leads to a decrease in the heat transfer coefficient of the heat exchanger, but also increases the air flow rate. The resistance of the superheat exchanger reduces the heating capacity of the unit

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