Control method for multi-compressor and multi-module unit

Abstract

The invention provides a control method for a multi-compressor and multi-module unit. The multi-module unit comprises a controller and a plurality of groups of parallel multi-compressor modules, wherein each group of the multi-compressor modules comprises a main control board and a plurality of compressors; each compressor in each group is connected with the main control board of the group througha compressor control board; a signal output end of the controller is at least connected with a signal input end of the main control board of one group of the multi-compressor modules; each main control board comprehensively acquires running data of the unit according to a control signal of the controller, carries out multiple data coupling calculation via a pre-stored calculation method to obtainthe optimal running frequency of the unit, determines the group number of the multi-compressor modules participating in running, forms a control signal, transmits the control signal to the main control boards of the other groups of multi-compressor modules, and controls the number of the compressors participating in running and the running frequency of each compressor.

Description

technical field [0001] The invention belongs to the technical field of heating and ventilation, and in particular has a control method for a multi-press and multi-module unit. Background technique [0002] Heat pump water heaters are being used more and more for their advantages of cost saving, low energy consumption, no potential leakage, and high heating efficiency. Users need hot water all year round, especially in winter, when the amount of hot water is large, and the water temperature on the condensation side It often has to rise from 5°C to 55°C, which brings great difficulties to the design and operation of heat pumps. It is difficult for conventional heat pump air conditioners to adapt to such a wide range of temperature changes, resulting in the inability of ordinary household heat pump water heaters to meet the water needs of users. [0003] In order to provide enough heat, the simple solution in the early stage was to use high-power inverter compressors. However, ...

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Problems solved by technology

[0002] Heat pump water heaters are being used more and more for their advantages of cost saving, low energy consumption, no potential leakage, and high heating efficiency. Users need hot water all year round, especially in winter, when the amount of hot water is large, and the water temperature on the condensation side It often has to rise from 5°C to 55°C, which brings great difficulties to the design and operation of heat pumps. It is difficult for conventional heat pump air conditioners to adapt to such a wide range of temperature changes, resulting in the inability of ordinary household heat pump water heaters to meet the water needs of users.

[0003] In order to provide enough heat, the simple solution in the early stage was to use high-power inverter compressors. However, there are few types of high-power inverter compressors and their prices are high, which increases the economic burden on enterprises and users. A heating unit composed of modular multi-compressors. The heating unit is connected with multiple compressors in parallel to supply enough hot water while heating to meet the needs of users for hot water.

During the working process of commonly used multi-compressor or multi-module multi-compressor heating units, multiple compressors need to work synchronously, which consumes a lot of energy. In order to save energy, conventional frequency conversion compressors are usually used, which are adjusted uniformly according to the number of users and water temperature The operating frequency of each compressor achieves the effect of reducing consumption, but because the variable frequency compressor frequency range is 30HZ-120HZ, the capacity adjustment range is 46%-100%, and the minimum indoor unit capacity range is only 1800W-2200W, the whole machine The capacity adjustment range cannot meet the capacity requirements of the smallest indoor unit, and a bypass unloading method is needed to solve this problem, but the solution effect is not good, and the current situation of redundant operation of the inverter compressor still occurs, and the conventional control method cannot solve the above problems problems, leading to the problem of low energy efficiency ratio of the whole machine under low load conditions, resulting in energy waste, which does not meet the national energy saving and emission reduction and the user's demand for high efficiency and energy saving

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