Control method of multi-compressor single-module unit

Abstract

The invention provides a control method of a multi-compressor single-module unit. The unit comprises a controller, a main control panel and a multi-compressor module; the multi-press module comprisesa plurality of compressors connected in parallel, and the compressors are connected with the main control panel through corresponding compressor control panels; and the main control panel comprehensively collects operation data of the unit according to a user control signal transmitted by the controller and conducts multi-data coupling calculation through a prestored calculation method, the best operation frequency of the unit and the quantity of the compressors participating in operation are obtained, a control signal is formed and transmitted to the compressor control panels, and the quantity of the compressors participating in operation and the operation frequency of each compressor are controlled.

Description

technical field [0001] The invention belongs to the technical field of heating and ventilating, in particular to a control method for a single-module unit with multiple compressors. 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. How...

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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. However, since the frequency range of the inverter compressor is 30HZ-120HZ, the capacity adjustment range is 46%-100%, and the capacity range of the smallest indoor unit is only 1800W-2200W. The capacity adjustment range of the unit cannot meet the capacity requirements of the smallest indoor unit. It is necessary to use the bypass unloading method to solve this problem, but the solution effect is not good, and the current situation of redundant operation of the inverter compressor still occurs, which cannot be solved by conventional control methods The above problems lead 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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