Solar photovoltaic-loop hot water system and operation control method

Abstract

The invention provides a solar photovoltaic-loop hot water system. The solar photovoltaic-loop hot water system comprises a heat collection evaporator, a preheating water tank, a controller, a secondevaporator, a condenser and a heat storage water tank, wherein the condenser is arranged inside the heat storage water tank, the second evaporator is arranged inside the preheating water tank, a firstheat collecting pipe set and a second heat collecting pipe set are arranged inside the heat collection evaporator, the second heat collecting pipe set is a common heat collecting pipe, a loop heat pipe is formed between the first heat collecting pipe set and the heat storage water tank, a solar water source heat pump loop is formed between the second heat collecting pipe set and the preheating water tank, a first temperature threshold value and a second temperature threshold value are arranged inside a temperature sensor, and when the temperature of the heat collection evaporator monitored bythe temperature sensor is higher than the first temperature threshold value or is lower than the second temperature threshold value, the controller control system starts a solar water source heat pump loop so as to improve the hot water temperature of the heat storage water tank.

Description

technical field [0001] The invention belongs to the technical field of building energy conservation, and in particular relates to a solar photovoltaic-loop hot water system and an operation control method. Background technique [0002] Traditional photovoltaic systems can only convert about 15% of the incident solar energy into electricity, and most of the rest are converted into heat that raises the temperature of the photovoltaic system. The solar photovoltaic-loop heat pipe system is similar to an independent solar photovoltaic system. In summer conditions When running at low temperature, there will be unfavorable working conditions that the temperature of photovoltaic panels and heat-absorbing panels is too high, and too high operating temperature will not only affect the photoelectric conversion efficiency and service life of solar photovoltaic panels, but also lead to obvious solar photothermal conversion efficiency. decline. When working in winter, the unfavorable wo...

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Problems solved by technology

[0002] Traditional photovoltaic systems can only convert about 15% of the incident solar energy into electricity, and most of the rest are converted into heat that raises the temperature of the photovoltaic system. The solar photovoltaic-loop heat pipe system is similar to an independent solar photovoltaic system. In summer conditions When running at low temperature, there will be unfavorable working conditions that the temperature of photovoltaic panels and heat-absorbing panels is too high, and too high operating temperature will not only affect the photoelectric conversion efficiency and service life of solar photovoltaic panels, but also lead to obvious solar photothermal conversion efficiency. decline

When working in winter, the unfavorable working conditions that the heat pipe cycle starts late and stops early, and the outdoor ambient temperature is too low, the temperature difference between the heat absorbing plate and the environment is too large, and the heat loss is high, resulting in low photothermal efficiency of the system

Especially when applied in hot summer and cold winter or tropical / subtropical climate zones, the system operating temperature remains high for a long time, which will have a negative impact on the system's photothermal and photoelectric efficiency

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