Control method of heat pump water heater, heat pump water heater and heat pump unit

Abstract

The invention discloses a control method of a heat pump water heater, the heat pump water heater and a heat pump unit and belongs to the field of heat pump water heater devices and control methods thereof. The control method of the heat pump water heater, the heat pump water heater and the heat pump unit are designed in order to overcome the defect that protection on a compressor is not available in the prior art. The control method of the heat pump water heater includes the steps that the water flow value is controlled according to the water inlet temperature of a water side heat exchanger, the water flow value is increased along with increase of the water temperature, and the higher heating energy efficiency ratio COP can be obtained under the condition that reasonable loads of the compressor are guaranteed. The heat pump water heater for implementing the control method comprises a control device, a water pump and a thermal bulb, wherein the water pump and the thermal bulb are connected with the control device. The thermal bulb is arranged at the position of the water inlet end of the water side heat exchanger. The water pump is a variable-frequency water pump. According to the control method of the heat pump water heater, the heat pump water heater and the heat pump unit, the water flow value is controlled according to the water inlet temperature of the water side heat exchanger, and the higher heating energy efficiency ratio COP can be obtained under the condition that the reasonable loads of the compressor are guaranteed.

Description

technical field [0001] The invention relates to the field of heat pump water heater devices and control methods thereof, in particular to a heat pump water heater control method, a heat pump water heater for realizing the control method, and a heat pump unit including multiple heat pump water heaters. Background technique [0002] There is an existing constant temperature controller for a heat pump water heater. The water pump is electrically connected to a frequency converter module, and the frequency converter module is electrically connected to a main controller. The main controller is electrically connected with the display screen. The flow sensor is arranged behind the water outlet of the water pump, and the flow sensor is electrically connected with the main controller. Set the required hot water temperature T0, T1 is the outlet water temperature. When T0>T1, control the inverter module to output a lower frequency, so that the pump speed decreases, the flow Q decr...

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Problems solved by technology

If the water flow rate is too small, the temperature difference between the inlet and outlet water will be too large. When the water tank temperature (similar to the inlet water temperature) reaches the set temperature after the water tank is heated for a long time, the outlet water temperature will be higher, which will cause a large load on the compressor. Affect the service life of the compressor; if the water flow is too large, the temperature difference between the inlet and outlet water will be small. Although the large water flow will effectively protect the compressor when the inlet water temperature is high, it will lead to insufficient heat transfer at low inlet water temperature. , COP (heating energy efficiency ratio) and heating capacity are too small, resulting in a large loss of energy

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