Heat pump unit and anti-freezing control method thereof

Abstract

The invention discloses a heat pump unit and an anti-freezing control method thereof. The heat pump unit comprises N parallel module machines. The control method includes the following steps that the outdoor environment temperature is detected, and the water inlet temperature and the water outlet temperature of each module machine are detected; when the kth module machine is in a standby state and it is judged that the kth module machine needs anti-freezing protection according to the outdoor environment temperature and the water inlet temperature and the water outlet temperature of the kth module machine, a water pump and a control valve which correspond to the kth module machine are controlled to be started, and whether the water inlet temperature and the water outlet temperature of the kth module machine meet the first preset condition or not is judged after first preset time; and if the first preset condition is not met, the water pump and the control valve corresponding to each module machine are controlled to be in a started state when the kth module machine is in a normal usable state, the kth module machine is started to conduct heating, and therefore unnecessary starting and stopping caused by the anti-freezing protection need are reduced, and the probability that a certain module machine is frozen to be damaged due to faults is lowered.

Description

technical field [0001] The invention relates to the technical field of heat pump water heaters, in particular to an anti-freezing control method of a heat pump unit and a heat pump unit. Background technique [0002] For heat pump units connected in parallel with multiple modular units, only some of the modular units may need to be started due to load changes during winter operation, and the modular units in the shutdown state may be damaged by freezing when they are on standby at low temperatures, so the heat pump unit needs to be protected against freezing Strategy. [0003] The existing antifreeze protection strategy generally detects the temperature of the incoming and outgoing water. When the water temperature is lower than a certain value, the current module machine is started for antifreeze protection. This antifreeze protection strategy is only for the protection of each module machine itself. For the system Other module machines have no protective effect. When thi...

AI Technical Summary

Problems solved by technology

Therefore, an object of the present invention is to propose an antifreeze control method for heat pump units, which can effectively solve the problem of antifreeze when multi-module units are connected in parallel, reduce unnecessary start-up and stop due to the need for antifreeze protection, and reduce certain The probability that a module machine is frozen due to a fault

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