Efficient integrated system utilizing solar radiation medium-temperature heating and sky radiation refrigeration

Abstract

The invention discloses an efficient integrated system utilizing solar radiation medium-temperature heating and sky radiation refrigeration. The efficient integrated system comprises fixed reflector heat collection / refrigeration double-effect arrays, a heat storage tank, a cold storage tank, a double-effect absorption type refrigeration unit and a cooling device; each fixed reflector heat collection / refrigeration double-effect unit comprises a radiation cooling reflector, a rotating module and a receiver module; the radiation cooling reflectors are horizontally placed on the ground, and the receiver modules are located above the radiation cooling reflectors and are controlled by the rotating modules to move in an arc shape. The system can provide a medium-temperature heat source and a conventional cold source at the same time, can achieve all-weather refrigeration, is large in comprehensive energy supply per unit occupied area, is high in solar energy utilization rate and refrigeration efficiency, is provided with fixed collecting lenses, and is low in cost.

Description

technical field [0001] The invention relates to an integrated heating and cooling system, in particular to a high-efficiency integrated system using solar radiation for medium-temperature heating and sky radiation for cooling, and belongs to the technical field of new energy and energy saving. Background technique [0002] At present, the energy consumption of buildings in the country has exceeded a quarter of the total energy consumption in the country, and there is a continuous upward trend, while the energy consumption of air conditioners occupies a large proportion of the total energy consumption of buildings. Using free clean energy to solve air-conditioning energy consumption is the future development trend, and natural energy-free solar cooling and sky radiation cooling are likely to become the main solutions in the future. [0003] Sky radiation cooling is a cooling method that permanently releases the heat of objects into the universe in the form of infrared radiati...

AI Technical Summary

Problems solved by technology

However, the above concentrating methods are not very suitable for combination with radiation cooling. The main reasons are: 1) The reflector needs to be rotated according to the position of the sun when it is working, which is not convenient for arranging cooling pipes; 2) In order to avoid the occlusion between the reflectors, the There is a large distance, and the effective area of ​​cold radiation is low; 3) The orientation of the reflector is not directly facing the sky, and the radiation angle coefficient is small and fluctuating, which affects the cooling capacity of cold radiation

In addition, the current line-focusing method still has the following shortcomings in terms of heat collection: 1) The construction cost of heat collection devices is relatively high, such as the cost of trough heat collectors is about 5.2 yuan / W, and the cost of linear Fresnel heat collectors is about 4.5 yuan. Yuan / W, compared with traditional and other energy sources, the advantages are not obvious; 2) The maintenance cost is high, there are a large number of rotating parts, the structure is complex and the failure rate is high; 3) The utilization rate of solar energy per unit area is low, and the trough collector and linear The effective utilization rate of the Fresnel collector area is only about 55% and 65%; 4) The trough collector has the disadvantages of heavy installation and poor wind resistance, while the linear Fresnel collector has light concentration efficiency Insufficiencies such as low concentration ratio

However, because the trough collector has the disadvantages of high cost and difficult operation and maintenance mentioned above, and the efficiency of the double-effect absorption refrigeration system is still relatively low compared with the compressor refrigerant, the solar refrigeration air conditioner has an effective unit area. Problems such as low utilization rate, low comprehensive utilization rate throughout the year, and inability to operate at night and cloudy days, these factors hinder the popularization and application of solar double-effect absorption chillers

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