Heat-power cogeneration system and method using solar energy or air energy

Abstract

The invention discloses a heat-power cogeneration system and method using solar energy or air energy, and belongs to the field of heat supply and solar application. The system comprises a source sideassembly, a user side assembly and a double-source combined heat pump. The source side assembly is provided with a high-temperature water tank and a low-temperature water tank; a solar energy heat absorption branch, a low-temperature water tank branch, a heat pump evaporator branch and a high-temperature water tank branch are arranged in parallel on a water pipe path; the user side assembly comprises a user heating branch and a heat pump condenser branch; and the double-source combined heat pump is provided with a water source evaporator branch and an air source evaporator branch. The system is compact in structure, flexible in adjustment, safe and reliable, and has broad application prospects. The heat supply method can realize three heat storage modes of solar energy low-temperature water tank heat storage, solar energy high-temperature water tank heat storage and air source high-temperature water tank heat storage and two heat supply modes of water source heat pump heat supply and air source heat pump heat supply by switching between a water path and a refrigerant branch, simultaneously realizes efficient cooling of photovoltaic back sheets, and improves the heat supply guarantee rate and the solar energy utilization rate.

Description

technical field [0001] The invention relates to the field of comprehensive solar energy utilization, in particular to a solar or air energy cogeneration system and method thereof. Background technique [0002] Solar energy is a clean and efficient renewable energy. Making full use of solar energy can effectively reduce dependence on fossil fuels and alleviate energy crisis and environmental pollution. The use of solar energy is generally divided into natural lighting, photovoltaic (photovoltaic) and photothermal, among which photovoltaic and photothermal are the most widely used forms. Photovoltaic-thermal integration (PV / T) technology developed in recent years can comprehensively utilize photovoltaic and photothermal, reduce the temperature of the backplane of photovoltaic cell modules at the same time, improve the efficiency of photovoltaic power generation, and effectively improve the comprehensive utilization efficiency of solar energy. [0003] In the prior art, there ...

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Problems solved by technology

However, the system has the following problems: 1) When the solar radiation is strong during the day but there is no indoor heating demand, the water temperature of the water storage tank gradually rises (even exceeding 40°C), resulting in a significant drop in photovoltaic power generation efficiency; 2) When the sun is shining during the day When the radiation is weak but the temperature is high, the COP of the air source heat pump unit is high at this time, but the existing scheme does not consider the use of high-temperature air energy storage during the day, resulting in a large selection of existing heat pump units and a high initial investment; 3) The existing scheme of the system is only for the utilization of sunlight and heat in the heating season, and does not fully consider the problem of temperature control of photovoltaic cells in the non-heating season.

[0004] In summary, there is a lack of a solar-air energy cogeneration system in the prior art, which can use solar energy and air to efficiently store heat and supply heat during the heating season, while taking into account the efficiency of photovoltaic power generation, and control the temperature of the photovoltaic backplane during the non-heating season. And compact structure, easy to adjust

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