Heat pump water heater variable frequency compressor initial frequency control method and control device

Abstract

The invention provides a method and a control device for controlling the initial frequency of a frequency conversion compressor of a heat pump water heater. According to the method for controlling the initial frequency of the variable frequency compressor of the heat pump water heater of the present invention, the method includes: step S1: obtaining the water temperature Tw of the water tank, the set temperature Ts of the water tank, and the outdoor ambient temperature Te; step S2: determining the operation of the variable frequency compressor according to the outdoor ambient temperature Te upper limit frequency Fu; step S3: determine the initial frequency F0 of the inverter compressor and the proportional coefficient K of the upper limit frequency Fu according to the difference Ts-Tw of the set temperature Ts of the water tank and the water temperature Tw of the water tank and the outdoor ambient temperature Te, and according to F0= K Fu determines the initial frequency F0. The invention makes the initial frequency close to the stable operating frequency, so that the frequency conversion compressor of the heat pump water heater can quickly reach a stable state, timely and stably replenish hot water, and increase the water production of the unit.

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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