Multiply parallel carbon dioxide heat pump control method based on target load control

Abstract

The invention discloses a multiply parallel carbon dioxide heat pump control method based on target load control. The multiply parallel carbon dioxide heat pump comprises a carbon dioxide circulationloop, a heat source pipeline and a hot water pipeline. The control method is characterized in that the opening degree of an electronic expansion valve is adjusted according to the temperatures of theinlet and the outlet of the hot water pipeline, the flow in the hot water pipeline and the target outlet water temperature preset by a user. The steady-state change of the system pressure can be achieved by adjusting the electronic expansion valve based on fluctuation of parameters such as user side temperature and flow, so stable adjustment of system energy is achieved, a target effluent water temperature change curve is rapidly and stably converged to a target value, and it is guaranteed that the outlet water temperature can be rapidly and stably stabilized.

Description

technical field [0001] The invention relates to a control method of a heat pump device, in particular to an energy regulation control method of a multi-parallel heat pump unit based on target load control. Background technique [0002] As an energy-saving and environment-friendly equipment to replace traditional energy supply methods, heat pump technology has become a current research hotspot. At present, the normal temperature heat pump technology with a condensing temperature lower than 50°C has matured and entered the market application stage. In order to meet industrial needs and broaden the application range of heat pumps in industry, heat pump technology is moving towards high temperature, high efficiency, green, and heat supply. development in a wide range of directions. The promotion and use of heat pumps with large heating energy, environmental friendliness, renewable utilization, and excellent cycle performance are one of the key points and difficulties in expandi...

AI Technical Summary

Problems solved by technology

[0004] The operating pressure of the carbon dioxide heat pump system is 4 to 5 times higher than that of conventional refrigerant heat pumps. Loading and unloading of the system can easily cause pressure fluctuations, resulting in system instability, fluctuations in outlet water temperature, and thus waste of energy

Therefore, the current multi-parallel carbon dioxide heat pump system usually has the problem of low energy utilization caused by the defect of the control method.

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