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

Abstract

The invention discloses a high pressure liquid storage tank control-based high temperature heat pump system and a control method thereof. The whole high temperature heat pump system is divided into five main modules, namely an evaporator, a condenser, a compressor, a capillary pipe and a high pressure liquid storage tank. Operation in stable states of pressure of the evaporator, pressure of the condenser and the mass flow of the capillary pipe is realized by main measures of guaranteeing the condensing pressure of the condenser and carrying out feedforward control on industrial wastewater transmission temperature by a high pressure liquid storage tank energy storage control method. According to the high pressure liquid storage tank control-based high temperature heat pump system, by construction of an inner loop control method of the high pressure liquid storage tank for controlling pressure at a condenser outlet and carrying out feedforward control on a high temperature heat source side, coordinative control over the system can be quickly realized under a condition of the frequency of the compressor, so that the dynamic adjustment quality of the evaporator and the condenser are improved; meanwhile, by the adoption of the high temperature heat pump system with the high pressure liquid storage tank, normal operation of the compressor can be guaranteed, and the heat exchange effect of the condenser is enhanced; and an efficient circulating refrigerant guarantees efficient, stable and safe operation of the system.

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