Constant temperature flow control method for heat pump water heater and double-system unit using same

Abstract

The invention discloses a constant temperature flow control method for a heat pump water heater and a double-system unit using the same, relates to a fluid heater utilizing a heat pump and a control method thereof, and particularly relates to a constant temperature flow control method for the heat pump water heater and a double-system primary heating type heat pump water heater unit using the method. The double-system primary heating type hot pump water heater unit comprises a heat pump system A, a heat pump system B, a water supply heating system C and a constant temperature flow control device, wherein PID regulation on water flow is performed according to outlet water temperature; an outlet water temperature set value is set as a target value, and the opening of a constant temperature flow valve is controlled according to a checking value of the outlet water temperature so as to adjust the water flow; when the temperature of a water box is low, a constant temperature water pump and a compressor are started, and the unit operates at constant temperature; when inlet water temperature is too high, a bypass-valve is opened; and one system in a double-system generates a fault and stops operation, the outlet water set temperature is down-adjusted, the water flow of a heat pump unit is guaranteed, and the condensation effect and heating capacity and energy efficiency of the unit are improved, so that the other system without the fault is safely and stably operated in an efficient manner.

Description

technical field [0001] The invention relates to a fluid heater using a heat pump and a control method thereof, in particular to a constant temperature flow control method for a heat pump water heater and a dual-system primary heating type heat pump water heater using the method. Background technique [0002] The current non-renewability of "fossil energy" such as coal, oil, and natural gas and the rapid reduction of global reserves have brought about a worldwide energy shortage. Coupled with the deteriorating ecological environment of the earth, it is necessary to protect the ecological environment and accelerate development and utilization. Renewable energy has become an urgent and arduous task for mankind. As an energy-saving and environment-friendly air source heat pump water heater, it has also been widely recognized. The bright market prospect of energy-saving products has also produced a revolutionary replacement trend for traditional water heating equipment. Air sour...

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Problems solved by technology

[0003] However, under many factors such as start-up, defrosting, low ambient temperature, damage to one of the refrigeration systems in the dual system, or damage to one of the outlet water temperatures, the control logic of the existing system is difficult to achieve long-term safe, stable, and efficient operation. question

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