A defrosting system and control method for a heat pump water heater

Abstract

Disclosed are a defrosting system of a heat pump water heater and a control method of the defrosting system. The defrosting system comprises a compressor, a condenser, a throttling element, a liquid accumulator, an evaporator and a gas-liquid separator which are sequentially connected, a first electric heating pipe is welded in the liquid accumulator and serially connected with a first temperature controller disposed in the liquid accumulator to be connected with a controller, a second electric heating pipe is welded in the gas-liquid separator and serially connected with a second temperature controller disposed in the gas-liquid separator to be connected with the controller, a compressor exhausting temperature sensor is arranged on the pipe wall of an exhausting pipe of the compressor, an evaporator outlet temperature sensor is arranged in an outlet pipeline of the evaporator, a water temperature sensor contacting with water is arranged in the condenser, the compressor exhausting temperature sensor, the evaporator outlet temperature sensor and the water temperature sensor are all connected with the controller, and the throttling element is also connected with the controller. By the defrosting system, the problems of low water temperature, long defrosting time, low defrosting efficiency, inaccurate judgment on controlling of defrosting starting and defrosting finishing and the like in the process of defrosting can be solved.

Description

technical field [0001] The invention belongs to the technical field of heat pump water heaters, and in particular relates to a defrosting system of a heat pump water heater and a control method thereof. Background technique [0002] The air source heat pump water heater is a heat pump device that uses the working principle of the heat pump, and the working fluid absorbs low-temperature heat from the ambient air to produce domestic hot water. Heat pump water heaters have the advantages of safe use, energy saving, and low operating costs. However, the air source heat pump water heater also has the problems of attenuation of heating capacity and frosting in low temperature environment, which affects its popularization and use. When the outdoor temperature is too low in winter, the evaporating temperature of the heat pump system is too low, and frost is easily formed on the surface of the evaporator. Frosting not only increases the resistance of the air and reduces the air flo...

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Problems solved by technology

[0004] In order to solve the above-mentioned problems in the prior art, the object of the present invention is to provide a defrosting system of a heat pump water heater and its control method, which can solve the problems of low water temperature, long defrosting time, low defrosting efficiency and control defrosting during the defrosting process. Problems such as inaccurate judgment of frost start and end

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