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Central air conditioner starting control method

A central air-conditioning and air-conditioning technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as small pressure difference between suction and exhaust, affecting the usable performance and working efficiency of central air-conditioning, and false fault alarms

Active Publication Date: 2017-01-04
QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD
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Problems solved by technology

[0003] However, the general central air conditioner basically adopts suction superheat control to control the expansion valve. However, in the start-up stage of the compressor, the pressure difference between suction and exhaust is small, and it is easy to report a fault that the pressure difference is too low, resulting in a wrong fault alarm, and then Affect the usable performance and working efficiency of the central air conditioner

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0078] like figure 2 Shown: choose R22 refrigerant and stepped screw compressor;

[0079] According to the refrigerant and the compressor, the suction and exhaust pressure difference is set to 0.4Mpa, and the normal suction and exhaust pressure difference is 0.43Mpa;

[0080] Setting the setting adjustment time of the expansion valve to be 5 minutes;

[0081] Set the first setting value to x 1 =0.003Mpa / s, the second setting value is x 2 =0.004Mpa / s;

[0082] Set the freezing water inlet temperature t ranges as t<10°C, 10°C≤t≤12°C, 12°C<t≤14°C, and t greater than 14°C, and set the temperature corresponding to each of the freezing water inlet temperature ranges The maximum suction pressure and the minimum suction pressure are as follows:

[0083]

[0084] Among them, the low pressure alarm value of the electronic expansion valve pressure control stage is: 0.32Mpa when R22 refrigerant is selected.

[0085] Actual measurement results in:

[0086] The actual suction pre...

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Abstract

The invention provides a central air conditioner starting control method. The central air conditioner starting control method comprises determining the suction-exhaust pressure difference and the normal suction-exhaust pressure difference in dependence on a compressor and a refrigerant; measuring the actual suction pressure and the actual exhaust pressure of the compressor, and calculating the difference between the actual suction pressure and the actual exhaust pressure; and comparing the difference with the suction-exhaust pressure difference. With respect to the central air conditioner starting control method, the adjusting time, the suction pressure descent rate and the freezing water inlet temperature are controlled, circulation pressure difference can be established quickly at the starting phase of the compressor, and the problem that the pressure difference is not satisfied for a long time, and therefore the working condition of the compressor is abnormal, and the whole compressor is poor in refrigeration or heating effect.

Description

technical field [0001] The invention belongs to the field of air-conditioning equipment control, and in particular relates to a central air-conditioning start-up control method. Background technique [0002] At present, among air-conditioning and refrigeration equipment, central air-conditioning is recognized and adopted by consumers because of its advantages of low energy consumption and strong temperature control performance. In hot summer or cold winter, the speed at which the indoor temperature drops or rises after the air conditioner is powered on will directly affect the comfort of cooling or heating. Therefore, the cooling / heating speed when the air conditioner is turned on is a measure of the temperature control performance of the air conditioner. One of the important indicators. [0003] However, the general central air conditioner basically adopts suction superheat control to control the expansion valve. However, in the start-up stage of the compressor, the pressu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B49/02F25B41/06F25B41/31
CPCY02B30/70
Inventor 王军程绍江禚百田邵文俊时斌
Owner QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD
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