Chiller - Cooling Capacity Control
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Date: 2023-11-17
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Comments and reviews: 17
Michael
IGVs impart a pressure drop in the refrigerant loop lowering its density. The compressor is a volumetric device so now each unit volume of refrigerant has less mass. The evaporator is a mass device so there is less mass flow from the restricted inlet thus less capacity. The IGVs also pre-swirl the refrigerant thus keeping the compressor on its curve. The compressor generates constant compression ratio at constant speed so the outlet pressure is proportionally lower due to lower inlet pressure. Capacity has nothing to do with refrigerant angle of incidence but stability does. A simple butterfly valve could be used but they impart too much turbulence at low opening and dont give the range of IGVs because of their flow characteristics.
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IGVs impart a pressure drop in the refrigerant loop lowering its density. The compressor is a volumetric device so now each unit volume of refrigerant has less mass. The evaporator is a mass device so there is less mass flow from the restricted inlet thus less capacity. The IGVs also pre-swirl the refrigerant thus keeping the compressor on its curve. The compressor generates constant compression ratio at constant speed so the outlet pressure is proportionally lower due to lower inlet pressure. Capacity has nothing to do with refrigerant angle of incidence but stability does. A simple butterfly valve could be used but they impart too much turbulence at low opening and dont give the range of IGVs because of their flow characteristics.
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IMHOTEP1
I think you should have mentioned that the hot gas leaves first of all the compressor heads up to the cooling tower (your red color line at 32c) cools down them come back as subcooled into the evaporator then leaves the evaporator heading to the AHU.
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I think you should have mentioned that the hot gas leaves first of all the compressor heads up to the cooling tower (your red color line at 32c) cools down them come back as subcooled into the evaporator then leaves the evaporator heading to the AHU.
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Dimas
Thanks for the video. I REALLY DO APPRECIATE IT. am still waiting for the next another video form this chanel. I HOPE it would be all about the wiring diagram which is controlling the system in its sequences, thank you so much.
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Thanks for the video. I REALLY DO APPRECIATE IT. am still waiting for the next another video form this chanel. I HOPE it would be all about the wiring diagram which is controlling the system in its sequences, thank you so much.
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Arjun
It actually founded useful even but I know the 3D dimension of the compressor to draw, labels and creativity because it's founded difficult to understand about the name of the labels and demonstrations for my work experiences.
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It actually founded useful even but I know the 3D dimension of the compressor to draw, labels and creativity because it's founded difficult to understand about the name of the labels and demonstrations for my work experiences.
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Anthony
Isn't this very similar to an expansion valve? Would this drop the pressure as well? Even though the vapor should already be at a low pressure coming from the evap? Why can't we use an expansion valve for capacity control?
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Isn't this very similar to an expansion valve? Would this drop the pressure as well? Even though the vapor should already be at a low pressure coming from the evap? Why can't we use an expansion valve for capacity control?
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yokelee
the video should not be describing chill and condensor water layout. instead it should combine vane guide and hot gas bypass. also show compressor surge graph and when hot gas bypass is required.
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the video should not be describing chill and condensor water layout. instead it should combine vane guide and hot gas bypass. also show compressor surge graph and when hot gas bypass is required.
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Lucas
I thought the cooling capacity was controlled by the expansion valve, as you explained in a previous video. Does it a work in a combination of the expansion valve and the compressor?
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I thought the cooling capacity was controlled by the expansion valve, as you explained in a previous video. Does it a work in a combination of the expansion valve and the compressor?
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Carlos
Hey thanks for this great videos. Question aren this temperature sensors usually located in a well or they need to be in direct contact with the water, refrigerant or oil?
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Hey thanks for this great videos. Question aren this temperature sensors usually located in a well or they need to be in direct contact with the water, refrigerant or oil?
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chamila
Many thanks for sharing your knowledge with us. In here your talking about centrifugal compressor, so in screw type compressor what is the capacity control method?
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Many thanks for sharing your knowledge with us. In here your talking about centrifugal compressor, so in screw type compressor what is the capacity control method?
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education
Just curious as to why the induction motor housing would be insulated. Wouldnt you want to bleed off as much heat from that motor as possible? Thanks
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Just curious as to why the induction motor housing would be insulated. Wouldnt you want to bleed off as much heat from that motor as possible? Thanks
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Jake
How does the vane control work in tandem with the expansion valve? The expansion valve can also be allowed to open only as much as required, right?
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How does the vane control work in tandem with the expansion valve? The expansion valve can also be allowed to open only as much as required, right?
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Sam
How about VSD centrifugal compressor? In that case do they also have guide vane? And which is a priority to control? VSD speed or vane opening?
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How about VSD centrifugal compressor? In that case do they also have guide vane? And which is a priority to control? VSD speed or vane opening?
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Amd
I see at the end of the video, you've used kind of chiller simulation program, may I know the name or link of this program please?
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I see at the end of the video, you've used kind of chiller simulation program, may I know the name or link of this program please?
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Masterchef
on what parameter does the guide vanes operate? evaporator refrigerant pressure or leaving chilled water temperature?
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on what parameter does the guide vanes operate? evaporator refrigerant pressure or leaving chilled water temperature?
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Sadan's
Thankc for the support. could you please tell me what is the use of induction Moter installed with the compressor unit?
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Thankc for the support. could you please tell me what is the use of induction Moter installed with the compressor unit?
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Amjad
Thank you for your outstanding explanation it was useful indeed I'm making service to one of this type of chillers
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Thank you for your outstanding explanation it was useful indeed I'm making service to one of this type of chillers
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Saqib
Very knowledgeable
Sir plz share one clip about high compressor lift alarm in centrifugal compression system.
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Very knowledgeable
Sir plz share one clip about high compressor lift alarm in centrifugal compression system.
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