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Defrosting method of air source heat pump water heater

An air source heat pump and water heater technology, applied in fluid heaters, lighting and heating equipment, damage protection, etc., can solve the problems of heat pump working fluid evaporation temperature drop, large errors, and different effects.

Active Publication Date: 2016-11-23
江苏鑫昊空调设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many factors that cause the fan current to change, so determining the timing of defrosting may lead to false alarms
[0009] ⑤Using the temperature difference between the evaporator tube and the fin as the judgment of the start of defrosting, the temperature of the evaporator tube and the fin is also different according to the frosting on the surface of the evaporator, but it is difficult to use in practice, because this method has a great influence on the temperature The reliability and layout requirements of the sensor are high, and the error is large
[0010] ⑥Using the temperature of the heat pump working fluid in the evaporator tube as the basis for judging the start of defrosting. Also affected by ambient temperature, not the only relevant factor
This fuzzy control needs to measure a variety of signals and complex mathematical model processing, the effect is different, and no convincing processing method has been seen

Method used

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  • Defrosting method of air source heat pump water heater
  • Defrosting method of air source heat pump water heater
  • Defrosting method of air source heat pump water heater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The air source heat pump water heater system of Embodiment 1 includes compressor 1, four-way valve STF, hot water condensation heat exchanger 2, throttle J1, air source fin heat exchanger 3, and air source fin heat exchanger Fan 3a, gas-liquid separator 4, mild throttle J2, one-way valve D1, hot water storage tank 6, circulating water pump SB, characterized in that it is arranged with a mild throttle reverse flow bypass and throttle J1 is connected in parallel, and a mild restrictor J2 and a one-way valve are installed on the bypass, and the flow direction of the one-way valve D1 points to the hot water condensation heat exchanger; the refrigerant process of the anti-heat pump cycle defrosting is: compressor 1 → Four-way valve STF → Air source fin heat exchanger 3 → One-way valve D1 → Mild restrictor J2 → Hot water condensation heat exchanger 2 → Four-way valve → Gas-liquid separator 4 → Compressor; An ambient air temperature probe T1 is arranged on the casing of the so...

Embodiment 2

[0045] The air source heat pump water heater system of Embodiment 2 includes a compressor 1, a hot water condensation heat exchanger 2, a throttle J1, an air source fin heat exchanger 3, a fan 3a of the air source fin heat exchanger, an air-liquid Separator 4, hot water storage tank 6, hot water condensation heat exchanger 2 placed in hot water storage tank 6, defrosting bypass valve DCF1; the lower end interface between the compressor exhaust port and the air source fin heat exchanger Between, add a defrost bypass with a defrost bypass valve installed in parallel with the throttle; figure 1 The control circuits shown in lines 1, 2, 4, and 6; when the four defrosting conditions are all met, that is, the four normally open signal contacts T a ,Δ T , τ and Δ t 1 When both are closed, after the system sends a defrosting signal command, the defrosting starts, the coil N of the defrosting relay is energized, the third contact N3 of the defrosting relay is opened, and the fan...

Embodiment 3

[0047] The refrigerant circulation system of the air source heat pump water heater in embodiment 3 is the same as that in embodiment 2, the difference is that hot water spray is used for defrosting; The road is a separate hot water pipeline for defrosting that is connected to the water outlet of the hot water storage tank at one end or the outlet of the hot water condensation heat exchanger, and the other end is connected to the water spray pipe above the air source fin heat exchanger. A defrosting solenoid valve DCF2 is installed on the defrosting hot water pipeline, and a water spray hole is drilled on the lower side of the water spray pipe PS; figure 1 The control circuit shown in lines 1, 2, 3, 4, and 7; when defrosting starts, the coil N of the defrosting relay is energized, and the second and third contacts N2 and N3 of the defrosting relay are immediately opened, and the compressor And the fan immediately stops running; the sixth contact N6 is closed, the defrosting ho...

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PUM

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Abstract

The invention discloses a defrosting method of an air source heat pump water heater. The defrosting method is characterized by comprising the following steps: the heat transfer temperature difference and the heat transfer temperature difference change speed are calculated through measuring the environment temperature and the temperature and time of an evaporator coil; the environment temperature, the opening time, the heat transfer temperature difference and the heat transfer temperature difference change speed are compared with defrosting condition set values; when four defrosting conditions are all satisfied, the defrosting signal is sent to realize defrosting through normally closed and normally open contacts of a defrosting relay, start and stop of a fan and a compressor of a control system and opening and closing of a four-way valve or a defrosting bypass electromagnetic valve or a defrosting hot water electromagnetic valve; the defrosting time and the temperature of the coil are compared with defrosting end signal set values; the defrosting end signal is sent; the defrosting end procedure is actuated; and the system recovers normal operation. The defrosting method comprises four-way valve reverse heat pump circulation, or bypass hot air defrosting, or hot water defrosting, or compound defrosting. The defrosting method is accurate in defrosting judgment, clear in logic, cheap in probe, easy for measuring signals and fast and thorough in defrosting, saves the energy, and is suitable for defrosting of all air source heat pump water heaters for sucking air energy to produce hot water.

Description

technical field [0001] The invention relates to the technical fields of refrigeration air conditioners, heat pump water heaters and energy saving. Background technique [0002] Air source heat pump water heaters are high-efficiency and energy-saving equipment. However, in high-humidity areas in winter, severe frosting and long defrosting times cannot be used in severe cases. The defrosting problem of heating and cooling air conditioners and air source heat pump water heaters has been studied extensively for a long time. There are four defrosting methods used by air source heat pump water heaters in the current market: The first is refrigerant reverse heat pump cycle defrosting: The refrigerant circuit is equipped with a four-way valve, and the four-way valve is switched during defrosting, and the refrigerant is circulated by the reverse heat pump. The refrigerant absorbs the heat of hot water from the hot water condenser, is compressed by the compressor, and is sent to the o...

Claims

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Application Information

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IPC IPC(8): F25B47/02F24H9/00F24H4/02
Inventor 陈则韶
Owner 江苏鑫昊空调设备有限公司
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