Graded and pressure-divided modular heat energy lifting system and control method thereof

Abstract

The invention provides a graded and pressure-divided modular heat energy lifting system and a control method thereof. The graded and pressure-divided modular heat energy lifting system comprises multiple stages of heat pump modules connected in parallel, and each heat pump module comprises an evaporator, a compressor, a condenser and a throttling valve. Each evaporator comprises a waste hot water heat exchange pipe and a first refrigerant heat exchange channel. Each condenser comprises a second refrigerant heat exchange channel and a hot water supply heat exchange pipe. The first refrigerant heat exchange channels, the compressors, the second refrigerant heat exchange channels and the throttle valves are connected end to end to achieve closed circulation. The waste hot water heat exchange pipes of the adjacent heat pump modules communicate with each other. The hot water supply heat exchange pipes of the adjacent heat pump modules communicate with each other. The multiple stages of heat pump modules are connected in parallel, so that graded and pressure-divided operation of the heat pump modules is achieved. The single-stage heat pumps are subjected to modular treatment, the number of the running heat pump modules can be controlled according to actual conditions such as the running working condition and cost, combination is convenient and fast, and the applicability is higher.

Description

technical field [0001] The invention relates to the field of heat pump control, in particular to a hierarchical and partial pressure modularized thermal energy raising system and a control method thereof. Background technique [0002] China is the world's largest manufacturing country, with a large number of coke, ferrous metal smelting (steel), non-ferrous metal smelting, non-metallic manufacturing, and chemical industries, with a large output of products. Industrial energy consumption accounts for more than 70% of my country's total energy consumption, at least 50% of which is converted into industrial waste heat with different carriers and different temperatures, while the current industrial waste heat recovery rate in my country is only about 30%, and the rest is discharged into the atmosphere or water in the form of waste heat , low energy efficiency. Heat pump is an effective technology to improve the grade of heat energy, especially suitable for absorbing heat from ai...

AI Technical Summary

Problems solved by technology

Generally, heat pumps with large temperature rise are difficult to maintain a high system performance coefficient (COP), which is mainly limited by the efficiency of components and the form of system circulation. Therefore, in order to meet the above requirements, it is necessary to reasonably design and optimize the heat pump system to further improve the performance of industrial heat pumps. Capacity, heating temperature and system performance

Images