A nanofluidic microchannel photovoltaic photothermal integrated evaporator/collector

Abstract

The invention discloses a nano-fluid micro-channel photovoltaic photothermal integrated evaporator / heat collector, which is mainly composed of a glass cover plate, a nano-fluid and its flow channel, a micro channel, a photovoltaic cell, a thermal insulation material layer and a frame. The invention combines a microchannel with a nanofluid-PV / T heat collector based on spectral frequency division; the microchannel is immersed in the nanofluid and placed in the middle of two photovoltaic cells, which can simplify the heat transfer thermal resistance of the heat collector. structure and guarantee low occlusion. The size of the microchannel and the nanofluid flow channel are matched, the heat transfer rate is high and the specific surface area is large, which can ensure the heat transfer effect in the flow channel regardless of natural circulation or forced circulation. At the same time, it can be used as a heat collector (single-phase working medium in the microchannel) and evaporator (two-phase working medium in the microchannel) at the same time according to application requirements.

Description

technical field [0001] The invention relates to the technical field of integrated solar energy photoelectric photothermal application, in particular to a nanofluidic microchannel photovoltaic photothermal integrated evaporator / heat collector. Background technique [0002] Population has quadrupled over the last century, energy consumption has increased sixfold, and average global temperatures today are much higher than those of the past millennium. Energy shortage has become a common problem faced by mankind. Insufficient non-renewable energy, rising global temperature and decreasing fossil energy, increasing carbon dioxide emissions leading to global warming are all very serious problems. According to statistics, by the end of 2019, the global CO2 emissions from burning fossil fuels will reach 36.8 billion tons, up from 36.57 billion tons in 2018. In addition, traditional energy sources such as coal and oil are used more, and their combustion products contain NOx and SOx,...

AI Technical Summary

Problems solved by technology

Traditional PV / T collectors have their own shortcomings in application: 1) PV laminated modules are the highest temperature components in the entire system, and their photoelectric efficiency is lower than that of conventional photovoltaic cells, resulting in greater heat loss in the system; 2) Solar radiation When reflecting and refracting on the interface of two media with a large difference in refractive index, the light loss is large; 3) The additional black back film for enhancing light and heat absorption and the metal substrate of the welding flow channel make the layers of the PV module The pressure structure is complex; 4) The metal substrate, PV and packaging materials have different thermal expansion coefficients, and the stress imbalance caused by temperature changes will cause damage to the PV and reduce the life of the PV / T collector

[0009] In summary, the existing traditional PV / T heat collector / evaporator and / or PV / T heat collector / evaporator based on nanofluid spectral frequency division have the following defects: (1) Nanofluid acts as both heat absorber and heat transfer The heat medium has the highest temperature, which leads to a large heat loss; the spiral reinforced heat pipe measures are adopted in the system collector to reduce heat loss, which will cause the collector structure to become complicated and the thickness to increase, which will affect the overall performance

(2) The air interlayer is used in the PV / T collector plate to reduce the thermal resistance, but it increases the light loss, which in turn affects the overall performance of the system

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