A trans-critical CO2 heat pump water heater pressure control method and system

A heat pump water heater and control method technology, applied in refrigerators, refrigeration components, fluid heaters, etc., can solve problems such as complex processes, and achieve the effect of more, faster and more direct adjustment methods.

Inactive Publication Date: 2015-09-09
GD MIDEA HEATING & VENTILATING EQUIP CO LTD +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a transcritical CO 2 A control method and system for the pressure of a heat pump water heater to solve the technical problem that the above control method and system directly control and adjust the opening of the electronic expansion valve, and the process is relatively complicated

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  • A trans-critical CO2 heat pump water heater pressure control method and system
  • A trans-critical CO2 heat pump water heater pressure control method and system
  • A trans-critical CO2 heat pump water heater pressure control method and system

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0052] Transcritical CO of the present invention 2 For the flow control diagram of Embodiment 1 of the pressure control method of the heat pump water heater, see figure 1 , including the following steps.

[0053] Step S1, collect the outlet temperature t of the air cooler of the water heater system gc , evaporator evaporation temperature t e , compressor exhaust pressure P and water tank outlet temperature T w1 .

[0054] Step S2, according to the outlet temperature t of the air cooler gc and evaporator evaporation temperature t e Calculate the optimal discharge pressure P of the compressor opt .

[0055] Step S3, judging the compressor discharge pressure P and the optimal discharge pressure P opt Whether the difference is within the allowable range, if yes, keep the current running state; otherwise, go to step S4.

[0056] Step S4, judging th...

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Abstract

The invention relates to a trans-critical CO2 heat pump water heater pressure control method and system. The method comprises the steps of collecting the outlet temperature tgc of an air cooling device, an evaporation temperature te of an evaporator, a discharge pressure P of a compressor, and a water outlet temperature Tw1 of a water tank; calculating the optimal discharge pressure Popt according to tgc and te; judging whether the difference between P and Popt is within an permissible range and maintaining the current operation state if the difference is within the permissible range and performing the step S4 if the difference is not within the permissible range; by judging the difference between Tw1 and the preset water outlet temperature Tw0 and an evaporator fan rotating speed V, adjusting the water inlet flow of the air cooling device, the evaporator fan rotating speed and the electronic expansion valve opening degree according to a preferential order until the difference between P and Popt is within the permissible range. Through the preferential adjustment order, the difference between P and Popt is within the permissible range and the performance coefficient (COP) of the system reaches the maximum, so that the system stability is improved, the service life of the electronic valve is prolonged and the system reliability is improved.

Description

technical field [0001] The invention relates to the field of controllers for heat pump water heaters, in particular to a transcritical CO 2 A method and system for controlling the pressure of a heat pump water heater. Background technique [0002] Due to the green environmental protection natural refrigerant CO 2 With its advantages such as non-toxicity, no damage to the ozone layer, no emergence effect, and good thermodynamic properties, it has once again attracted people's attention. At the same time, due to the transcritical CO 2 The exothermic process of the cycle is in the supercritical region, and there are characteristics such as temperature slip in the exothermic process, which is especially suitable for heat pump water heater systems. Carbon dioxide is used in a transcritical heat pump water heater system, which has advantages that conventional heat pumps do not have: environmental protection and strong hot water production capacity. The ability to produce hot w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24H9/20F24H4/02F25B49/02
Inventor 崔晓龙
Owner GD MIDEA HEATING & VENTILATING EQUIP CO LTD
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