Key Technologies of Ground Source Heat Pump Applied in High Temperature Environment
Ground source heat pump is a low energy consumption, high efficiency and environmental protection heating technology with rapid development. Its unique energy exchange system enables ground source energy to be used as extremely low temperature heat source at the same time, and is a suitable technology for heating and cooling in the environment with high temperature and the dry season. This paper mainly introduces the key technologies applied in ground source heat pump for high temperature environment.
First, the heat source side of the ground source heat pump should be optimized. In practical applications, the shallow depth of soil can generally ensure the ground source heat source is at low temperature, and high soil temperature can hinder heat transfer and cause the system to stop working. The soil can be treated with high temperature blocking material to modify its thermal conductivity, so that its heat energy can be more evenly distributed, thus the heat source temperature can be controlled.
Second, the heat emission side of the ground source heat pump needs heat dissipation with anti-freezing capability. In order to avoid freezing, anti-freezing measures are adopted in the design of the heat emission device, such as increasing the water pump flow and directly injecting antifreeze into the ground gravity zone in the refrigerant system of the ground source heat pump.
Third, the air side system design should be optimized. When the ambient temperature is too high, the traditional system design of the air side of the ground source heat pump may not achieve the required cooling effect. In order to reduce the loss of cooling performance and save energy consumption, the evaporator in the air side system is designed to have a larger air volume space, divided into several segmented chambers, the air flow is negative pressure induced to improve the efficiency.
Fourth, the ground source heat pump condenser temperature control systems need to be more optimized. In order to ensure smooth flow of the refrigerant and cool the condenser, the condenser temperature control system design needs to be optimized. This can reduce the power consumption of the compressor, prevent the evaporator from freezing and ensure that the ground source heat pump can work stably in high temperature environment.
Finally, spiral heat exchanger should be used. In order to improve the efficiency of ground source heat pump, it is necessary to use spiral heat exchanger between heat source side and heat emission side, which can increase heat exchange area, reduce the size of heat transfer system, reduce the cost and improve the efficiency of the ground source heat pump.
In summary, the key technologies applied in ground source heat pump for high temperature environment are mainly to optimize the heat source side, heat emitting side, air side system design and condenser temperature control system of the ground source heat pump, and to use spiral heat exchanger. Only by utilizing and grasping these technologies can we effectively ensure the safe and efficient application of ground source heat pump in high temperature environment.
