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Defrosting method of variable frequency air source heat pump water heater

An air source heat pump and water heater technology, applied in refrigeration and liquefaction, lighting and heating equipment, damage protection, etc., can solve problems such as unscientific judgment conditions, avoid frost-free defrosting, and reduce temperature fluctuations on the heating side , Improve the effect of energy efficiency ratio

Inactive Publication Date: 2018-11-30
SHUNDE POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, it is unscientific to directly use the tube temperature Ty as the discriminant condition

Method used

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  • Defrosting method of variable frequency air source heat pump water heater
  • Defrosting method of variable frequency air source heat pump water heater
  • Defrosting method of variable frequency air source heat pump water heater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] It is a defrosting method for a variable frequency air source heat pump water heater, and the defrosting method is as follows:

[0030] 1) At the initial stage of compressor start-up, collect the coil temperature Ty of the air-side heat exchanger, and use this temperature as the reference temperature Tb0. , after the compressor starts running for 5 minutes, and the frequency F1 has been running at a constant frequency for more than T1, T1=20 seconds, at this time, the temperature Ty of the heat exchange coil on the air side is collected as the reference temperature Tb0;

[0031] 2) During the normal hot water heating mode, if the operating frequency of the compressor is F2, and the running time has been constant at this frequency for more than T1, it will continue to detect the coil temperature Ty of the air-side heat exchanger;

[0032] 3) Use the controller to calculate the defrosting temperature Tg of the coil at the operating frequency F2, and the calculation formul...

Embodiment 2

[0049] It is a method for defrosting a variable frequency air source heat pump water heater, which is characterized in that the method for defrosting is as follows:

[0050] 1) At the initial stage of compressor start-up, collect the coil temperature Ty of the air-side heat exchanger, and use this temperature as the reference temperature Tb0. , after the compressor starts running for 12 minutes, and the frequency F1 has been running at a constant frequency for more than T1, T1=20 seconds, at this time, the temperature Ty of the heat exchange coil on the air side is collected as the reference temperature Tb0;

[0051] 2) During the normal hot water heating mode of the compressor, if the operating frequency is F2 and has been running at this frequency for longer than T1, it will continue to detect the coil temperature Ty of the air-side heat exchanger;

[0052] 3) Use the controller to calculate the defrosting temperature Tg of the coil at the operating frequency F2, and the cal...

Embodiment 3

[0069] It is a defrosting method for a variable frequency air source heat pump water heater, and the defrosting method is as follows:

[0070] 1) At the initial stage of compressor start-up, collect the coil temperature Ty of the air-side heat exchanger, and use this temperature as the reference temperature Tb0. , after the compressor starts running for 20 minutes, and the frequency F1 has been running at a constant frequency for more than T1, T1=20 seconds, at this time, the temperature Ty of the heat exchange coil on the air side is collected as the reference temperature Tb0;

[0071]2) During the normal hot water heating mode, if the operating frequency of the compressor is F2, and the operating time has been kept at this frequency for more than T1, it will continue to detect the coil temperature Ty of the air-side heat exchanger;

[0072] 3) Use the controller to calculate the defrosting temperature Tg of the coil at the operating frequency F2, and the calculation formula ...

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Abstract

The invention relates to a defrosting method of a variable frequency air source heat pump water heater. The defrosting method is characterized in that the coil temperature Ty of an air side heat exchanger is acquired and serves as reference temperature Tb0 when a compressor is at a starting initial stage, the coil temperature Ty of the air side heat exchanger is continuously detected when the compressor constantly runs for more than time T1 under running frequency F2 during a normal water heating mode, coil defrosting temperature Tg under the running frequency F2 is calculated by a controllerand can be calculated in advance to form a data table stored into an electric control storage, data are acquired by direct table look-up through a control program, defrosting needs to simultaneously meet the conditions that the coil temperature Ty of the air side heat exchanger is lower than Tx and the coil defrosting temperature Tg and the water heating mode continuously runs for more than T3, defrosting is finished under any of the conditions that the coil temperature Ty of the air side heat exchanger is higher than Tz, defrosting times exceeds T4, and the current of the compressor in defrosting exceeds Ir. The defrosting method has the advantages that energy efficiency ratio is increased, fluctuation of heating side temperature caused by defrosting is reduced and the like.

Description

technical field [0001] The invention relates to a defrosting method for a frequency conversion air source heat pump water heater. Background technique [0002] At present, the heat pump defrosting method generally adopts a combination based on the outdoor ambient temperature Ta, the air-side heat exchanger tube temperature Ty, and the continuous running time of the heat pump T3; judging the defrosting based on the above two temperatures, there are the following misjudgments: [0003] 1. In the low temperature environment, since the temperature of the heat exchange tube on the air side is always at a lower temperature, the defrosting condition will be triggered even if the heat exchanger is not frosted; [0004] 2. In frequency conversion operation, since the higher the operating frequency, the lower the temperature of the air side heat exchanger tube, therefore, when the frequency is running, even if there is no frost, the defrosting condition will be triggered; [0005] Th...

Claims

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Application Information

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IPC IPC(8): F25B47/02
CPCF25B47/02F25B2347/023
Inventor 李玉春余华明李锡宇王斯焱
Owner SHUNDE POLYTECHNIC
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