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Method for detecting frosting state of heat exchanger through temperature and humidity sensors

A humidity sensor and heat exchanger technology, which is applied in mechanical equipment, heating and ventilation control systems, heating and ventilation safety systems, etc., can solve problems such as incomplete defrosting, poor prediction effect, and reduced heat exchange capacity, so as to avoid The effect of incomplete defrosting, simple and convenient application, and clear state logic

Inactive Publication Date: 2020-12-04
GUANGDONG NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Frosting of the evaporator leads to deterioration of the performance of the air source heat pump and a decrease in heat exchange capacity
The defrosting process increases the instability of the operation of the air source heat pump unit, resulting in a decrease in indoor comfort.
The frosting of traditional heat exchangers uses the method of detecting the temperature difference between the ambient temperature and the coil temperature. However, in different environments, whether frosting depends not only on temperature, but also on humidity is an important factor for frosting. In the case of complex changes, there are problems such as false detection of frosting, poor prediction effect, and complicated detection process, which lead to inaccurate results, invalid defrosting or incomplete defrosting, resulting in deterioration of unit operation performance, heating capacity, air volume, Phenomena such as COP and other performance degradation greatly affect the reliability and stability of the air source heat pump unit

Method used

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  • Method for detecting frosting state of heat exchanger through temperature and humidity sensors
  • Method for detecting frosting state of heat exchanger through temperature and humidity sensors
  • Method for detecting frosting state of heat exchanger through temperature and humidity sensors

Examples

Experimental program
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Effect test

Embodiment 1

[0050] refer to figure 1 , a method for temperature and humidity sensors to detect the frosting state of a heat exchanger, based on the temperature sensor, humidity sensor 2, and water vapor dew point temperature, the temperature sensor and humidity sensor 2 are placed next to the coil 3, and the fins of the heat exchanger 1 In the middle position, the temperature T and relative humidity H of the fins of the heat exchanger are detected by the temperature sensor and the humidity sensor, combined with the heating continuous running time HCT of the unit, the above parameters are compared and analyzed with the corresponding preset threshold parameters. The setting thresholds include temperature threshold T1, temperature threshold T2, temperature threshold T3, humidity threshold H1, humidity threshold H2, heating continuous running time threshold HCT1, heating continuous running time threshold HCT2, real-time acquisition of heat exchanger through temperature sensor and humidity sens...

Embodiment 2

[0060] refer to image 3 A method for detecting the frosting state of a heat exchanger with a temperature and humidity sensor, comprising the steps of:

[0061] S01: judge whether the temperature T is greater than T3, if the judgment result is yes, turn to S02, if the judgment result is no, turn to S03;

[0062] S02: The frosting state of the heat exchanger is no frosting;

[0063] S03: judge whether the temperature T is greater than T2, if the judgment result is yes, turn to S04, if the judgment result is no, turn to S07;

[0064] S04: judge whether the relative humidity H is greater than H1, if the judgment result is yes, turn to S05, if the judgment result is no, turn to S02;

[0065] S05: judge whether HCT is less than HCT1, if the judgment result is yes, turn to S02, if the judgment result is no, turn to S06;

[0066] S06: The frosting state of the heat exchanger is low-probability frosting;

[0067]S07: judge whether temperature T is greater than T1, if the judgment ...

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Abstract

The invention discloses a method for detecting the frosting state of a heat exchanger through a temperature sensor and a humidity sensor, the temperature sensor and the humidity sensor are placed beside a coil pipe and in the middle of a heat exchanger fin, the temperature T and the relative humidity H of the heat exchanger fin are detected through the temperature sensor and the humidity sensor, and unit heating continuous operation time HCT is combined.The parameters are compared and analyzed with corresponding preset threshold parameters, wherein the preset thresholds include a temperature threshold T1, a temperature threshold T2, a temperature threshold T3, a humidity threshold H1, a humidity threshold H2, a heating continuous operation time threshold HCT1 and a heating continuous operation time threshold HCT2.The temperature and the relative humidity of the heat exchanger fin are obtained in real time through the temperature sensor and the humidity sensor, and state analysis and prediction are conducted on the frosting condition of the heat exchanger.According to the method, the frosting condition of the heat exchanger of a heat pump unit is accurately detected and predicted, areliable basis is provided for defrosting and frosting prevention of the heat pump unit, and the unit is prevented from entering invalid defrosting or incomplete defrosting.

Description

technical field [0001] The invention relates to an air source heat pump unit, in particular to a method for detecting the frosting state of a heat exchanger by a temperature and humidity sensor. Background technique [0002] For air source heat pumps, the weakest link in the current technology is the defrosting problem during winter operation. The frosting of the evaporator will lead to the deterioration of the performance of the air source heat pump and the decrease of the heat exchange capacity. The defrosting process increases the instability of the operation of the air source heat pump unit, resulting in a decrease in indoor comfort. The frosting of traditional heat exchangers uses the method of detecting the temperature difference between the ambient temperature and the coil temperature. However, in different environments, whether frosting depends not only on temperature, but also on humidity is an important factor for frosting. In the case of complex changes, there a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/30F24F11/64F24F11/61F24F11/41F24F140/20
CPCF24F11/30F24F11/41F24F11/61F24F11/64F24F2140/20
Inventor 赵密升林坚俊肖威
Owner GUANGDONG NEW ENERGY TECH DEV
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