A combined cooling, heating and power supply system based on PVT components and its operation method

Abstract

The invention relates to a combined cooling, heating and power system based on PVT components and an operation method thereof. The combined cooling, heating and power system based on PVT components includes a liquid working medium PVT heat collection system and a direct expansion PVT heat pump heating and cooling system. The working fluid PVT heat collection system and the direct expansion PVT heat pump heating and cooling system are connected to each other; the liquid working medium PVT heat collection system includes an air compression module, a vacuum pumping module and a liquid working medium heat collection module; the air compression module, pumping The vacuum modules are all connected to the liquid working medium heat collection module; the direct expansion PVT heat pump heating and cooling system includes a solar module, an air source module and a circulation control module; the solar module and the air source module are connected to the circulation control module. The beneficial effects of the invention are: the invention combines the direct expansion PVT heat pump heating and cooling system with the liquid working medium PVT heat collection system, reduces power consumption and improves power generation efficiency.

Description

technical field [0001] The invention relates to the field of solar energy utilization, and more specifically, to a combined cooling, heating and power supply system and operation method based on PVT components. Background technique [0002] Photovoltaic Thermal (PVT) technology efficiently absorbs the photovoltaic waste heat through the heat exchanger, the photovoltaic temperature is reduced, the influence of the photovoltaic temperature coefficient on its power generation performance is reduced, and the power generation efficiency is improved. The hot water can be used for domestic hot water or heating to realize combined heat and power supply. [0003] There are many types of PVT technology, a liquid PVT collector mainly uses water or antifreeze as the heat transfer medium. This technology absorbs photovoltaic waste heat through circulating heat transfer medium. This type of collector needs to add thermal insulation material to ensure the collector. Has a certain thermal ...

AI Technical Summary

Problems solved by technology

The problem with this type of collector is that: in summer, when the temperature of the water tank reaches the set point or the heat collection system fails and the heat collection cycle cannot be performed, the waste heat of the photovoltaic system will gradually accumulate due to the thermal insulation characteristics of the heat collector, which will eventually lead to The temperature of the collector exceeds its safe use range, which poses a safety hazard; under winter conditions, the ambient temperature is low, the heat loss of the heat collection system is large, and the thermal efficiency is low, and hot water of the required temperature cannot be produced in time, requiring more additional consumption The energy is used for auxiliary heating; it is greatly affected by the weather conditions, and the system basically cannot operate in rainy days

However, compared with the power generation of PVT itself, the power consumption of direct expansion PVT heat pumps is still relatively large, and there may even be a situation where its power consumption is greater than its power generation, and only when the heat pump is working, PVT has the effect of power generation gain. When working, the power generation performance of PVT is slightly lower than that of Photovoltaic (PV) modules under the same working conditions

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