Water source heat pump air conditioner system and control method thereof

Abstract

The invention provides a water source heat pump air conditioner system and a control method thereof. The water source heat pump air conditioner system achieves independent temperature and humidity control through a simple system frame structure, two sets of water source heat pump units do not need to be installed, a solution dehumidifying device does not need to be added, the requirement for the unit capacity configuration of the system is relatively low, the initial investment cost is easily reduced, gradin utilization can be conducted on the refrigerating capacity of source water by the system in summer, the operation efficiency of the system is improved, even if the temperature of source water is below 15 DEG C, the stable operation of the system can also be kept, and therefore low-heat-source water energy can be effectively utilized. The water source heat pump air conditioner system is used in combination with the control method of the water source heat pump air conditioner system, the control operation is simple and convenient, the heat exchange circulation process is simple, the circulation route is short, the operation efficiency and stability of the system are easily improved, the control flexibility is high, independent control can be conducted according to the change of fresh air loads and indoor loads, the operation efficiency of the system is improved, and the operation energy consumption is lowered.

Description

technical field [0001] The invention relates to the fields of water and heat resource utilization technology and air conditioning technology, in particular to a water source heat pump air conditioning system and a control method for the water source heat pump air conditioning system. Background technique [0002] The current water source heat pump air conditioning system is mainly composed of source water intake system, water source heat pump unit and terminal unit (fresh air unit at the user end, air conditioning unit, etc.). Its environmental protection is mainly reflected in the full use of the heat storage performance of the soil and the constant temperature of the source water (such as groundwater, surface water, etc.), using the source water as a cold and heat carrier to realize the heat exchange between the unit and the earth. Specifically, in winter, the source water enters the evaporator in the water source heat pump unit driven by the source water intake system (ma...

AI Technical Summary

Problems solved by technology

Under normal working conditions, the lower the condensing temperature, the higher the efficiency of the unit in the water source heat pump air conditioning system, but the inlet water temperature is lower than 15 ℃ and the standard operating conditions of the current market water source heat pump unit are far apart, and the compressor in the heat pump unit When the condensing temperature is too low, the pressure difference between the two ends of the throttling device is too small, so that the refrigerant flow rate through the throttling device decreases sharply, the operating efficiency decreases, and functions such as oil return are affected, resulting in a shortened service life of the water source heat pump unit

This has led to the ineffective use of low-temperature source water energy with a temperature below 15°C in many areas of our country.

Moreover, in the existing water-source heat pump air-conditioning system, since the water-source heat pump unit can only provide air-conditioning chilled water at one temperature (generally about 7°C) under one operating condition, if independent control of temperature and humidity is to be achieved, there are generally the following four methods : 1) The fresh air dehumidification system and the air-conditioning terminal are respectively equipped with water-source heat pump units. This method leads to a complex system structure, low equipment utilization, and increased initial investment; 2) The mixed method of cold and hot water is used to supply the required high-temperature chilled water to the air-conditioning terminal (18~22°C), this method causes waste of cooling capacity and increases energy consumption of the water pump; 3) Set up an intermediate heat exchanger to supply high-temperature chilled water to the end of the air conditioner, this method also causes waste of cooling capacity; 4) Use solution to dehumidify The device is responsible for processing the fresh air so that it bears all the latent heat load of the building and controls the indoor humidity. However, the solution dehumidification needs to be equipped with a solution regenerator. Although the condensation heat of the unit can be recycled and used as the regeneration heat source, the system design is relatively complicated and the heat recovery efficiency is not high.

It can be seen that if the existing water source heat pump air-conditioning system is to achieve independent control of temperature and humidity, there are problems such as high initial investment cost, high energy consumption in operation, and low energy utilization rate.

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