Heating and refrigerating system by using solar energy and terrestrial heat

Abstract

The invention provides a heating and refrigerating system by using solar energy and terrestrial heat. The system comprises a heat collection device, a heat storage device, an underground heat exchange device, a heat conversion device, a heat collection circulating pump and a heat source circulating pump, wherein the heat collection circulating pump, the heat collection device, the heat storage device, the heat source circulating pump and the heat conversion device are connected in series through conduction devices in turn to form a first circulating circuit; the heat collection circulating pump, the heat collection device, the heat storage device, the heat source circulating pump, the underground heat exchange device and the heat conversion device are connected in series through the conduction devices in turn to form a second circulating circuit; a plurality of valves and the conduction devices for controlling the communication status are arranged between the first circulating circuit and the second circulating circuit; and energy is transferred inside the system through liquid substances. By means of the technical scheme, the heat collection efficiency and the solar energy contribution rate can be improved, heat energy can be sustainably and stably supplied for the heat conversion device, and the heat energy can be effectively returned.

Description

technical field [0001] The present invention relates to heating and cooling systems using solar energy and geothermal heat. Background technique [0002] At present, in the related art, the comprehensive utilization of solar energy and geothermal heat can be used for building heating and cooling, which can achieve the purpose of reducing conventional energy consumption and reducing environmental pollution. [0003] However, the related art has the following four problems. [0004] First, only the solar system and the geothermal system are combined in one system, and the utilization of solar energy and geothermal is separated in specific applications, such as: using the solar system for heating during the day, using the geothermal system for heating at night, or The solar energy system is used for heating in winter, and the geothermal system is used for cooling in summer. In this technical solution, the solar energy and the geothermal energy are not comprehensively utilized,...

AI Technical Summary

Problems solved by technology

[0004] First, only combine the solar system and the geothermal system in one system, and separate the utilization of solar energy and geothermal in specific applications, for example: use the solar system for heating during the day, and use the geothermal system for heating at night, or The solar system is used for heating in winter, and the geothermal system is used for cooling in summer. In such a technical solution, there is no comprehensive utilization of solar energy and geothermal energy, and it is impossible to effectively and comprehensively utilize solar energy and geothermal energy.

[0005] Second, the heat storage efficiency is low

For example, in some technical solutions, the collected solar energy is stored in an underground heat accumulator, and the heat accumulator also absorbs geothermal heat energy at the same time, and the heat conversion device relies on the heat energy stored in the heat accumulator for heating. The heat storage efficiency of the technical solution is low, and it is only suitable for use in areas with large temperature differences between day and night. When used in other areas, when the collected solar heat energy is large and the temperature is high, and the soil temperature is low, the solar heat energy will be lost to the soil and cannot be used. Effective heat storage function is realized, thereby reducing the heat storage efficiency. It can be seen that this technical solution has low heat storage efficiency, strong regional pertinence, and does not have extensive application

In addition, in some technical solutions, heat storage or heat accumulators are not installed, and the heat energy collected is directly converted into heat. In this way, due to the instability of solar energy, a part of solar thermal energy will be wasted when the solar energy is sufficient, and when the solar energy Insufficient solar energy cannot be fully utilized, which will lead to unstable system operation

[0006] Third, the heat collection efficiency is low and the contribution rate of solar energy is low

If separate solar heating is used, the heating hot water needs to be heated above 45 degrees to meet the heating conditions, and because the solar heat collection efficiency is inversely proportional to the temperature of the produced water under the same environmental conditions, when the collector outlet temperature is 45 When the temperature is above 20°C, compared with the outlet water temperature of 20°C, the heat collection efficiency of the collector is low, and the heat gain of the system is small. When the geothermal heat energy cannot be comprehensively and effectively utilized, the system will not work effectively and stably

In addition, when the heat storage efficiency of the system is low, it cannot provide an effective heat source for the heat conversion device, so that the system cannot be guaranteed to work stably and effectively

[0007] Fourth, the collection and discharge of geothermal energy are unbalanced

For example, in some technical solutions, only the geothermal heat is collected without heat return, or the collected heat and the returned heat are unbalanced. When the collected underground heat is greater than the returned heat, the As a result, the underground temperature field is out of balance, and the collected geothermal heat is gradually reduced. In the long run, the system will not be able to continue to work and cause waste

[0008] At present, no effective technical solutions have been proposed to solve the above problems

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