Heat pump system and its control method

Abstract

The invention provides a heat pump system and a control method thereof. The control method is used to control the heat pump system, including: after the main controller receives the start-up signal, detects the working condition parameters of the water tank, and judges whether the first preset start-up condition is met; if so, detects the total flow path connected to the water tank working condition parameters, and determine whether the second preset start-up condition is met; if met, the main controller sends a start-up command to all sub-controllers; each sub-controller detects the working condition parameters of its corresponding branch, and Judging whether the third preset start-up condition is met; if yes, start the heat pump unit corresponding to the branch. The control method provided by the present invention can correct the detection result of the working condition parameters of the water tank through the secondary judgment of the main controller and the sub-controllers, so as to eliminate the detection deviation of the working condition parameters of the water tank, avoid the abnormal operation of the heat pump unit, and reduce the The interaction between the heat pump units is eliminated, and the reliability of the heat pump units is improved.

Description

technical field [0001] The present invention relates to the field of heat pump systems, and more specifically, to a control method for a heat pump system and a heat pump system. Background technique [0002] For commercial heat pump systems, depending on the water consumption, heat pump units with different heating capabilities need to be matched. When the demand for hot water is particularly large, a single heat pump unit cannot provide sufficient heating capacity, and multiple heat pump units need to be connected in parallel. Use, form a parallel system to meet the use requirements. For the heat pump system including parallel heat pump units, the temperature sensor of the water tank is generally used for control at present. If the water temperature drops, all the parallel units are turned on at the same time. Since there are multiple relatively independent heat pump units in the heat pump system, it is difficult to ensure that all heat pump units operate under the same co...

AI Technical Summary

Problems solved by technology

Since there are multiple relatively independent heat pump units in the heat pump system, it is difficult to ensure that all heat pump units operate under the same conditions during actual use. The operating conditions of each heat pump unit are different. In the same operation process, some heat pump units may be It is within the safe range, but some heat pump units are in the unsafe operating range. If all the heat pump units are forced to operate at the same time, the heat pump units will affect each other, causing damage to the unsafe operating heat pump units, which in turn causes damage to other heat pump units.

[0003] In addition, for commercial heat pump systems, the water tank needs to be installed on site, and the temperature sensor in the water tank also needs to be installed on site. There is bound to be a risk of incomplete installation on site. For example, the installation position of the water tank temperature sensor may not be consistent with the position designed by the manufacturer. The temperature sensor in the water tank is not well insulated, the temperature sensor in the water tank falls off from the installation position, the temperature sensor in the water tank is damaged (the temperature detection deviation is large), etc., resulting in abnormal temperature detection of the water tank, which cannot truly reflect the water temperature in the water tank, resulting in The temperature is higher than the design value, causing the heat pump unit to operate beyond the design safe operation range, or causing the unit to start and stop frequently, and eventually causing the unit to be damaged

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