A high-temperature heat pump system and control method based on high-pressure liquid storage tank control

Abstract

The invention discloses a high-temperature heat pump system based on a high-pressure liquid storage tank and its control method, which divides the high-temperature heat pump system into five main modules: Through the control method of ensuring the condensing pressure of the condenser and the energy storage of the high-pressure liquid storage tank and the feed-forward control of the transfer temperature of industrial wastewater, the evaporator pressure, condenser pressure, and capillary mass flow are simultaneously operated in a stable state. In the present invention, by constructing an inner loop control method for controlling the outlet pressure of the condenser by the high-pressure liquid storage tank and the feed-forward control for the high-temperature heat source side, the coordinated control of the system can be realized more quickly under the condition of the frequency of the compressor, and the evaporation rate can be improved. The dynamic adjustment quality of the condenser and condenser; at the same time, the high-temperature heat pump system using a high-pressure liquid storage tank can ensure the normal operation of the compressor, improve the heat exchange effect of the condenser, and efficiently circulate the refrigerant to ensure the high efficiency, stability and safety of the system run.

Description

technical field [0001] The invention relates to a high-temperature heat pump system controlled based on a high-pressure liquid storage tank, belonging to the field of thermal automatic control. Background technique [0002] In recent years, my country has actively developed efficient and green energy utilization technologies, and vigorously developed low-temperature heat energy recovery and utilization technologies. High-temperature heat pumps have a water supply temperature above 85°C and can be widely used in industry, construction and other fields, and are one of the important ways to replace electric energy. The use of waste heat from industrial waste water as the low-temperature heat source of the high-temperature heat pump can reduce heat pollution and increase energy utilization. Therefore, the water source high temperature heat pump has a good application prospect. The working fluid in the high temperature heat pump is required to circulate under the high temperatu...

AI Technical Summary

Problems solved by technology

The working fluid in the high temperature heat pump is required to circulate under the high temperature and high pressure environment, so scholars at home and abroad have done a lot of research work on the refrigerant and heating efficiency of the high temperature heat pump, but the research on the control strategy is insufficient.

In order to improve the efficiency of heat pumps, most researchers devote themselves to the matching technology of components. However, heat pump units usually operate under different loads. Once the load changes, the actual operating conditions will change accordingly, and the actual efficiency of the unit will be different from The rated operating conditions of the design vary greatly, so the high-temperature heat pump usually adjusts the output load through the working cylinder of the inverter compressor or the intermittent start-stop compressor during operation, but these methods have a great impact on the operating efficiency and system stability. big impact

[0003] [In addition, because the high-temperature heat pump system works under high temperature and high pressure for a long time, it is difficult to guarantee the safety and high efficiency, so the design of the control strategy is particularly important

At the same time, it is difficult to obtain good control quality due to disturbance, measurement noise, and uncertainty that have a certain interference effect on the controller.

At present, researchers at home and abroad mainly use advanced control algorithms such as: fuzzy control, neural network control, etc. to control and simulate the system, but there is little research on the direction of control strategy

Images