Combined device of three double-heat-source heat pump water heaters and energy saving optimization control method thereof

Abstract

The invention discloses a combined device of three double-heat-source heat pump water heaters and an energy saving optimization control method of the combined device. A first double-heat-source heat pump water heater is composed of a double-heat-source heat pump water heater working under high temperature and low temperature. A second double-heat-source heat pump water heater is composed of a double-heat-source heat pump water heater working under high temperature, a water source heat pump water heater working under low temperature and an air source heat pump water heater. A third double-heat-source heat pump water heater is composed of a water source heat pump water heater working under high temperature and low temperature and an air source heat pump water heater. A clear water heating flow path, a waste water heat energy utilization flow path and a washing water circulating loop are designed. Heat of bathing waste water is recovered through a waste water circulating pump, a waste water-clear water heat exchanger and a water source evaporator working under high temperature and low temperature. Tap water is heated through the waste water-clear water heat exchanger, a condenser of alow-temperature heat pump water heater and a condenser of a high-temperature heat pump water heater. The operation of water source and air source heat pumps is reasonably organized according to the environment temperature. The combined device of the three double-heat-source heat pump water heaters and the energy saving optimization control method of the combined device make up for defects of existing single water and air source heat pump water heaters, provide an advanced device and scientific method for preparing hot water, and have outstanding advantages in winter.

Description

technical field [0001] The invention relates to the technical field of heat pump water heater energy saving. Background technique [0002] There is a wide demand for hot water for bathing, and the water temperature is usually in the range of 40-50°C. Heat pump water heaters for hot water can save energy by 70-80% compared with electric water heaters. The output hot water heat energy of the heat pump water heater is absorbed by the heat pump from the ambient air energy or waste water heat energy or geothermal energy, plus the compression function consumed by the compressor to increase the temperature of the absorbed heat energy, the coefficient of performance of the heat pump is the thermal power output It is defined by the ratio of the power consumed by the compressor, which is expressed by the COP value. The COP value is related to the temperature difference between the output hot water temperature of the heat pump and the ambient heat source. When the output water temper...

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Problems solved by technology

[0003] In order to overcome the shortcomings of single air source and single water source heat pump water heaters, the present invention proposes three dual heat source heat pump water heater combination devices and their energy-saving optimization control methods. A multi-stage heat pump combination device for integral water source and air source heat pump water heaters; the energy-saving optimization control method is based on the research on the performance of the air source and water source heat pumps under variable working conditions and the evaluation of the energy of the waste water source. The temperature of the tap water is different, and the operation plan of the air source and water source heat pumps is proposed in different time periods, so that the respective advantages of the air source and water source heat pumps can be maximized to achieve the most energy-saving effect of hot water production throughout the year

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