High-drop multi-connected air-conditioning system and its control method
A multi-connected air conditioner and control method technology, applied in the direction of mechanical equipment, etc., can solve problems such as danger, and achieve the effect of realizing ultra-conventional high-drop connections
Inactive Publication Date: 2019-04-12
QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD
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Problems solved by technology
Under some working conditions, when the operating pressure of the unit is high, the liquid column pressure will cause the pressure in front of the electronic expansion valve of the side machine installed below to exceed the design pressure of the refrigerant system and cause danger
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Embodiment
[0065] When the air conditioning system of this application uses R410A refrigerant, the outdoor unit is installed above and the indoor unit is installed below. The specific steps are as follows:
[0066] When measuring the actual installation, the drop between the outdoor unit and the indoor unit is 100m;
[0067] According to the prior art, the density of R410A refrigerant is ρ=932kg / m 3 , The maximum design pressure of the system using R410A refrigerant is P x =4.15MPa, system control parameter error compensation P y =0.05MPa;
[0068] Set the refrigerant dryness required by the air-conditioning system to 0.1. According to the pressure enthalpy diagram of R410A refrigerant, the corresponding temperature when the dryness is 0 is 34°, and the corresponding temperature when the dryness is 0.1 is 24°, that is Obtain the control temperature as T k =34°-24°=10°;
[0069] Obtain the gravity acceleration of the installation area g=9.8m / s 2
[0070] The control pressure is calculated accordin...
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The invention discloses a control method of a high-fall multi-split air conditioner system. The method comprises the steps that the control pressure of the air conditioner system is set; the exhaust pressure of a compressor of an outdoor unit, the temperature of an inlet of an electronic expansion valve of the outdoor unit and the temperature of an outlet of the electronic expansion valve of the outdoor unit are monitored in real time, and the temperature difference of the two temperatures is computed; and the exhaust pressure of the compressor of the outdoor unit is compared with the control pressure, and if the exhaust pressure of the compressor of the outdoor unit is higher than the control pressure, the opening degree of the electronic expansion valve of the outdoor unit is adjusted according to the temperature difference. According to the high-fall multi-split air conditioner system and the control method thereof, through secondary comparison between the pressures and the temperatures, the opening degree of the electronic expansion valve is adjusted, the problem that dangers occur to the electronic expansion valve due to the fact that the pressure exceeds the highest bearing pressure when hyper-conventional high fall between the outdoor unit and an indoor unit exists can be solved, and thus the hyper-conventional high fall connection between the indoor unit and the outdoor unit of the air conditioner system is achieved.
Description
Technical field [0001] The invention belongs to the field of air conditioning equipment, and in particular relates to a high-drop multi-line air conditioning system and a control method thereof. Background technique [0002] Multi-line (or air-conditioning system with outdoor unit dragging multiple indoor units, the following content only mentions multi-line) When the ultra-conventional high-drop connection is made, due to the weight of the liquid refrigerant (liquid column), the side machine is installed below The pressure of the liquid pipe rises abnormally. In some working conditions, when the unit operating pressure is high, the liquid column pressure will cause the pressure before the electronic expansion valve of the machine on the lower side to exceed the design pressure of the refrigerant system, which may cause danger. [0003] The general way to solve this problem is to add a pressure reducing device to the liquid pipe of the outdoor unit. Through the control of the pres...
Claims
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IPC IPC(8): F24F11/64F24F11/84
Inventor 罗建文何建奇斯钦卢大海毛守博国德防
Owner QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD