Air energy water heater and defrosting method thereof

Abstract

The invention discloses an air energy water heater, which comprises a main controller, a compressor and an external environment temperature sensor, wherein the compressor and the external environment temperature sensor are electrically connected with the main controller through leads. The defrosting method mainly comprises the following steps: in the normal heating process, continuously monitoring outdoor environment temperature through the external environment temperature sensor; if the outdoor environment temperature is lower than the defrosting starting temperature, accumulating the running time of the compressor; when the accumulated running time of the compressor reaches the defrosting starting time, starting a defrosting program; and finishing defrosting when the external environment temperature is higher than the defrosting finishing temperature or the defrosting time exceeds the maximum defrosting time, thereby determining whether the defrosting program needs to be started or not by comparing the defrosting starting temperature with the temperature transferred by the external environment temperature sensor to avoid cold shock and thermal shock of external environment to the sensor and ensure the normal use of a sensor chip, so that normal and real judgment of the system can be ensured to enable the defrosting effect to be better.

Description

technical field [0001] The invention relates to the field of heating appliances, in particular to an air energy water heater and a defrosting method thereof. Background technique [0002] Air energy water heaters, also known as heat pump water heaters, are heat transfer devices that use the heating principle to absorb heat from the air to produce hot water. It transfers the heat in the air to the water by allowing the working fluid to continuously complete the thermodynamic cycle process of evaporation (absorbing heat from the environment) → compression → condensation (release heat) → throttling → re-evaporation. Since the air energy water heater works through the medium, there is no need for the electric heating element to be in contact with the water, there is no danger of electric water heater leakage, there is no danger of explosion and poisoning of the gas water heater, and there is no air pollution caused by the exhaust gas of the fuel water heater. Therefore, air ene...

AI Technical Summary

Problems solved by technology

Because the external unit coil sensor is in contact with the outdoor evaporating coil, the temperature of the external coil will drop to several degrees below zero or even tens of degrees when the compressor is started, and the temperature of the external coil is equivalent to the outdoor temperature when the compressor is turned off. , so that the thermal impact on the external disk sensor is particularly large, so the sensor chip is easily damaged

When the sensor chip is damaged, generally the user cannot detect it, and the system judgment will be distorted at this time, which may eventually cause adverse consequences such as failure to defrost, endless defrosting, or entering the defrosting program when there is no frost, affecting the To the normal operation of the system, the efficiency of cold and heat exchange of the water heater is reduced, thus wasting resources or failing to achieve the heating effect

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