Frost restraining and defrosting equipment for air source heat pump water chilling unit for different humidities and frost restraining and defrosting control method

An air source heat pump and water chiller technology, which is applied in lighting and heating equipment, refrigerators, refrigeration components, etc., can solve the problems of unclean defrosting, reduce user experience, and long defrosting process, and achieve monitoring and defrosting Thorough, good defrosting effect and high defrosting efficiency

Pending Publication Date: 2020-11-03
山东三土能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the higher the relative humidity, the greater the pressure drop of water vapor in the air, the greater the driving force of frost formation, and the easier it is for water vapor to condense on the surface of the frost layer to increase the thickness of the frost layer. For application in winter areas, the defrosting control logic is extensive and not targeted. In areas with high humidity, the air source heat pump units are severely frosted, and energy-saving management in the later period is difficult, and there is a lack of means to inhibit the formation of frost layers.
The defrosting process is long, and even wrong defrosting occurs, and the defrosting is not clean, which reduces the overall energy efficiency of the unit and reduces the user experience

Method used

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  • Frost restraining and defrosting equipment for air source heat pump water chilling unit for different humidities and frost restraining and defrosting control method
  • Frost restraining and defrosting equipment for air source heat pump water chilling unit for different humidities and frost restraining and defrosting control method
  • Frost restraining and defrosting equipment for air source heat pump water chilling unit for different humidities and frost restraining and defrosting control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Take an inland area as an example:

[0054] Firstly, set the parameters: frost suppression dew point temperature set value T0 is -5.8°C, heat pump outlet water set temperature t0 is 40°C, heat pump outlet water set temperature is increased by 12%, that is, water supply set temperature tg is 44.8°C, evaporator coil The set temperature difference between temperature and ambient temperature △t0 is -1.8°C, the photoelectric signal set value V0 is 7, the thickness of the frost layer has reached the defrosting threshold k1 is 0.8, and the compressor in the air source heat pump chiller is from the last defrosting The time setting value is 40min;

[0055] S1: Outdoor environmental parameter detection, set three outdoor temperature sensors, one sensor is located at the inlet of the thin tube of the heat exchanger of the unit at a temperature of 2°C, one is located at the middle of the heat exchanger at a temperature of 1.8°C, and the other is located at the outer shell of the pr...

Embodiment 2

[0077] Take a coastal area as an example:

[0078] Set T0=1.1,

[0079] The set temperature of the heat pump outlet water is 41°C, and the set temperature of the heat pump outlet water is increased by 12%, that is, the set water supply temperature tg=45.92°C,

[0080] The set temperature difference between the evaporator coil temperature and the ambient temperature △t0=-1.8℃,

[0081] Photoelectric signal set value V0=7V,

[0082] The thickness of the frost layer has reached the defrosting threshold k1=0.8,

[0083] The compressor in the air source heat pump chiller is 30 minutes away from the last defrosting time setting value, and the detection parameters under the weather on a certain day are as follows:

[0084] ①The temperature at the inlet of the thin tube of the heat exchanger of the unit is 1.9°C, one is located in the middle of the heat exchanger at 1.9°C, and the other is located on the protective frame shell at 2.3°C. The average value of the values ​​detected by...

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Abstract

The invention relates to the technical field of defrosting of air source heat pump water chilling units, in particular to frost restraining and defrosting equipment for an air source heat pump water chilling unit for different humidities and a frost restraining and defrosting control method. The air source heat pump water chilling unit and a frost restraining and defrosting device are arranged. The frost restraining and defrosting equipment is characterized in that an outdoor temperature sensor, an outdoor air relative humidity sensor, an evaporator temperature sensor, a video camera monitor,a surface air cooler fin photoelectric frost measuring sensor and a controller are arranged on the air source heat pump water chilling unit; the outdoor temperature sensor, the outdoor air relative humidity sensor, the evaporator temperature sensor, the video camera monitor and the surface air cooler fin photoelectric frost measuring sensor are connected with the frost restraining and defrosting device through the controller, and the frost restraining and defrosting device is controlled to work through the controller after detection numerical analysis of all the sensors. The frost restrainingand defrosting equipment and the frost restraining and defrosting method have the advantages that the method is simple, frost inhibition control has pertinence, the defrosting efficiency is high, andthe defrosting effect is good.

Description

technical field [0001] The invention relates to the technical field of defrosting of air source heat pump chillers, in particular to an air source heat pump chiller defrosting technique for different humidity with simple method, targeted frost suppression control, high defrosting efficiency and good defrosting effect A defrosting device and a method for controlling frost suppression and defrosting. Background technique [0002] It is well known that the frosting phenomenon of air source heat pumps is related to the partial pressure of water vapor and the absolute humidity difference of the airflow on both sides of the evaporator, and the relative humidity has a significant impact on mass transfer. This is because the higher the relative humidity, the greater the pressure drop of water vapor in the air, the greater the driving force of frost formation, and the easier it is for water vapor to condense on the surface of the frost layer to increase the thickness of the frost lay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B47/02F25B49/02
CPCF25B47/02F25B49/02
Inventor 邹本尧张清海
Owner 山东三土能源股份有限公司
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