Control method and control device for initial frequency of frequency conversion compressor of heat pump heater

Abstract

The invention provides a control method and control device for initial frequency of a frequency conversion compressor of a heat pump heater. The control method for the initial frequency of the frequency conversion compressor of the heat pump heater, disclosed by the invention, comprises the following steps: step S1: obtaining the water temperature Tw of a water tank, the set temperature Ts of the water tank and the outdoor environment temperature Te; step S2: determining the upper limiting frequency Fu for the operation of the frequency conversion compressor according to the outdoor environment temperature Te; step S3: determining the proportion coefficient K of the initial frequency F0 to the upper limiting frequency Fu of the frequency conversion compressor according to the difference value Ts-Tw between the set temperature Ts of the water tank and the water temperature Tw of the water tank and the outdoor environment temperature Te, and determining the initial frequency F0 according to F0=K Fu. According to the control method and control device, disclosed by the invention, the initial frequency is close to the stable operation frequency, so that the frequency conversion compressor of the heat pump heater rapidly achieves a stable state, hot water is complemented timely and stably, and the water yield of a machine set is increased.

Description

technical field [0001] The invention relates to the field of heat pump water heater control, in particular to a method for controlling the initial frequency of a variable frequency compressor of a heat pump water heater. Background technique [0002] Household direct heating air source water heater adopts the system type of "large heating capacity outdoor unit + small capacity water tank". Hot water is provided during the initial unstable stage of the outdoor unit to act as a buffer. The main source of hot water is still the heating of the outdoor unit. [0003] Due to the characteristics of the heat pump unit, it takes a certain amount of time from start-up to stable operation, and the speed of the stabilization time has a great impact on the water production of the unit: the shorter the time from start-up to stabilization of the unit, the more timely the supplementary heat will be, and the heat consumed by the buffer water tank will be more timely. The less water, the gre...

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Problems solved by technology

[0004] For DC variable frequency compressors, the current common practice is to slowly increase the frequency when starting up. Compared with fixed frequency compressors, the unit’s stable time is longer, which is not conducive to the low temperature production of household direct heating air source heat pump water heaters. amount of water

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