Constant-temperature water supply control method and system for all-frequency-conversion heat pump system

Abstract

The invention discloses a constant-temperature water supply control method and system for an all-frequency-conversion heat pump system. The method comprises S1, running parameters after a unit is started are collected in real time; S2 : judging whether current temperature is lower than the set target temperature is conducted; S3, if the current temperature is lower than the set target temperature,judging whether frequency of a compressor reaches an upper limit value is conducted; and step S4, if the frequency of the compressor does not reach the upper limit value, the frequency of the compressor is increased, and returning to the S2 is conducted. The constant-temperature water supply control method and system for the all-frequency-conversion heat pump system can conduct emergency heatingand heat supply.

Description

technical field [0001] The invention relates to the field of heat pump water heaters, in particular to a constant temperature water supply control method and system for a full frequency conversion heat pump system. Background technique [0002] like figure 1 As shown, a heat pump system in the prior art includes: a compressor, a four-way valve, a condenser, a sheet evaporator, a fan, a gas-liquid separator, an electronic expansion valve and a water pump. When running in the heating mode, the high-temperature and high-pressure refrigerant gas discharged from the compressor enters the condenser through the four-way valve to exchange heat with the water to be heated (thus heating the water), and the refrigerant gas condenses at the same time, and then passes through the electronic expansion valve Throttling, after the pressure is reduced, it becomes a low-pressure gas-liquid two-phase state, enters the thin-sheet evaporator, absorbs heat in the external environment, becomes a ...

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Problems solved by technology

[0003] Heat pump water heaters often encounter unstable water temperature in engineering applications. For example, during the initial heating process of a heating project, due to the low water temperature in the end pipe network, the water supply temperature needs to be heated for a long time to reach the set temperature. During the heating period, the unit consumes power However, because the water temperature is too low, the heat cannot be used, resulting in energy waste; for hot water projects, after filling up the hot water, if the power is cut off for a long time, the temperature of the water tank will drop to the low water temperature, and it will take a long time to reheat (usually in 10h or more), unable to deal with emergency water situation

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