Fan coil anti-freezing control method and system and air conditioner

Abstract

The invention discloses a fan coil anti-freezing control method and system and an air conditioner. The anti-freezing control method comprises the following steps: a temperature detecting step: the environment temperature is detected in a stop state; and when the environment temperature is lower than a first threshold, the water outlet temperature and the water return temperature of a fan coil aredetected; a judging step: the lowering and the lowering degree of the water temperature are judged according to the water outlet temperature and the water return temperature; and a control step: the startup and operation states of a water pump are controlled according to the judging results of the lowering and the lowering degree of the water temperature. At a low temperature, the lowering and thelowering degree of the water temperature are judged through detection of the water outlet temperature and the water return temperature of the fan coil, and the startup and operation states of the water pump are correspondingly controlled according to the lowering and the lowering degree, so that water cannot be frozen as ice when the water in a heat exchange tube of the fan coil can flow, the frost cracking problem of the fan coil is solved, the service life of the fan coil is prolonged, and the control method is reasonable and effective.

Description

technical field [0001] The present invention relates to the technical field of air conditioners, in particular to an antifreeze control method and system for fan coil units and an air conditioner. Background technique [0002] Fan coil unit is a routinely used terminal product. The fan coil unit uses water as the refrigerant to flow in the heat exchanger. It has high stability and comfort, so it is widely used in large-scale refrigeration projects. The temperature in winter is low, because the water in the heat exchange tube of the fan coil unit is blocked from flowing when the temperature is equal to or lower than zero, so some projects do not use the fan coil unit in winter. At this time, the water in the fan coil unit remains in the The following hidden dangers exist in the heat exchange tube: when the ambient temperature is lower than 0°C, the water will condense into ice, and the corresponding volume will expand at this time. As the water inside the heat exchange tube g...

AI Technical Summary

Problems solved by technology

The temperature in winter is low, because the water in the heat exchange tube of the fan coil unit is blocked from flowing when the temperature is equal to or lower than zero, so some projects do not use the fan coil unit in winter. At this time, the water in the fan coil unit remains in the The following hidden dangers exist in the heat exchange tube: when the ambient temperature is lower than 0°C, the water will condense into ice, and the corresponding volume will expand at this time. As the water inside the heat exchange tube gradually freezes, the volume will become larger and larger. The pressure on the heat exchange tubes is increasing, and eventually the heat exchange tubes of the fan coil unit are cracked, resulting in a series of hidden dangers such as water leakage in the fan coil unit during normal use, which greatly reduces the service life of the fan coil unit

[0003] In the existing antifreeze schemes for fan coil units, when the ambient temperature is low, most of them directly discharge the water in the fan coil unit to eliminate the hidden danger of heat exchange tubes caused by water freezing. The corresponding actual situation has not reached the point where drainage must be carried out. In addition, after direct drainage, it is necessary to refill water when it is reused later, which is inconvenient to operate and consumes time and manpower.

[0004] Therefore, it is urgent to propose a solution that can effectively solve the problem of freezing and cracking of the fan coil unit when it is not in use in winter, so as to improve the operating life of the fan coil unit.

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