Cooling, heating and electricity coupling system and realization method of deep and shallow geothermal buildings based on positive and negative cycles

Abstract

The invention discloses a positive and reverse cycle-based deep and shallow geothermal building cold and heat electrical coupling system and an implementation method. The system comprises a high temperature heat pump heating / refrigerating subsystem and a trans-critical Rankine cycle electricity generation subsystem, one side of an expansion machine (3) and a generator (4) are coaxially connected, the other side of the expansion machine drives a compressor (10) of the high temperature heat pump heating / refrigerating subsystem in a meshed mode through an adjustable coupling (9). The expansion machine and the compressor are in linkage, Rankine positive cycle and heat pump cycle coupling and flexible switching are achieved, building cold and hot electric loads in different seasons are met, and meanwhile balance of year-round temperature field of shallow geothermal energy is effectively kept. Devices such as an electric motor and an inverter of a heat pump system are omitted, and the conversion efficiency of the system is improved.

Description

technical field [0001] The invention belongs to the field of utilization of medium and low temperature geothermal energy, and in particular relates to a cold-heat-electric coupling system and an implementation method of deep and shallow geothermal buildings based on forward and reverse cycles. Background technique [0002] my country is rich in geothermal resources, and presents a distribution characteristic of medium and low temperatures. With the increasing energy crisis and environmental problems, shallow geothermal resources have been widely used in my country, and buried pipe heat exchange technologies such as shallow downhole heat exchangers and soil sources have been popularized and applied. At the same time, the utilization of deep geothermal heat has gradually attracted people's attention, and the conversion and utilization of transcritical Rankine cycle in deep geothermal heat has attracted widespread attention. [0003] The circulating working medium in the geoth...

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Problems solved by technology

However, the evaporation process with an intermediate medium circuit is widely used at present, and the evaporation and heat exchange losses in the circulation section are large.

At the same time, a large amount of condensation heat is released to the atmosphere through the cooling tower, resulting in heat loss and thermal pollution, while reducing the efficiency of the system

In addition, in the utilization of shallow geothermal heat by traditional ground source heat pumps, there are often problems of heat accumulation and imbalance in shallow soil caused by the difference in heat release in winter and summer, which leads to deterioration of system performance and environmental pollution.

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