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Multi-zone frosting map-based defrosting control method of air source heat pump

An air source heat pump, multi-zone technology, applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of compressor burnout, energy waste, insufficient heating, etc., and achieve the effect of avoiding false defrosting

Active Publication Date: 2016-06-29
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The consequences of "wrong defrosting" are not only energy waste, insufficient heating, and reduced indoor thermal comfort. In severe cases, the high-pressure side pressure exceeds the system high-voltage protection value, and the power of the compressor rises sharply, causing the compressor to burn out. vicious accident

Method used

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  • Multi-zone frosting map-based defrosting control method of air source heat pump
  • Multi-zone frosting map-based defrosting control method of air source heat pump
  • Multi-zone frosting map-based defrosting control method of air source heat pump

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Embodiment Construction

[0051] Determine the extent of the map: figure 1 , according to the main applicable temperature range of the air source heat pump and the temperature conditions of the air source heat pump heating in the area without heating season (with the semi-monthly average temperature as the dividing line), the abscissa (air temperature) range of the frosting map is set as -15 ℃~11.5℃, the ordinate takes the range of air relative humidity as 0~100%;

[0052] Determine the critical dew point line: use the air temperature and relative humidity to calculate the dew point temperature at any point on the frost diagram, and then connect the lines with the same dew point temperature to form an equal dew point temperature line; then according to the coil temperature T w T with air temperature a The calculation relation T of w =(1-k 2 )T a -k 1 , select an air source heat pump, and the on-site test obtains the k corresponding to the host 1 =10.26, k 2 = 0.17; any air temperature can be use...

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Abstract

The invention discloses a multi-zone frosting map-based defrosting control method of an air source heat pump and belongs to the technical field of defrosting. The control method is used for realizing efficient defrosting on the basis of multi-zone frosting maps by monitoring temperatures, humidity and time for air source heat pump units such as air source heat pump hot and cold water units, heat pump type room air conditioners and the like. The technical scheme is as follows: firstly, frosting maps of multiple zones are developed and contain two lines, three zones and five regions, and frosting speeds of the air source heat pump under different environment conditions can be judged according to the frosting maps of the zones; then monitored running time of the air source heat pump in different frosting zones is converted into standard defrosting time, and when the accumulated value of the time is equal to the set optimal defrosting interval, an air source heat pump unit begins to defrost. With the adoption of the method, the defrosting moment can be accurately judged, false defrosting accidents can be avoided, and the defrosting efficiency is high; the method is not limited by regions and climates and is high in practicability.

Description

technical field [0001] The invention relates to a novel defrosting control method, in particular to an air source heat pump defrosting control method based on a multi-region frost formation map, belonging to the technical field of defrosting. Background technique [0002] Frosting is a key problem affecting the operating efficiency of air source heat pump units. The existence and growth of the frost layer increases the heat transfer resistance of the outdoor heat exchanger of the air source heat pump unit, reduces the heat transfer coefficient, and increases the air flow resistance, which must be controlled by defrosting. Existing defrosting control methods include: 1) timing defrosting method; 2) heat exchanger surface temperature-time defrosting control method; 3) pressure-temperature defrosting control method; 4) heat exchanger surface temperature change rate defrosting Frost control method; 5) Defrost control method of heat exchanger surface and air temperature differen...

Claims

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Application Information

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IPC IPC(8): F25B47/00
CPCF25B47/00F25B2600/00
Inventor 王伟孙育英刘景东朱佳鹤白晓夏
Owner BEIJING UNIV OF TECH
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