CALCULATE Chiller cooling capacity - Cooling Load kW BTU Refrigeration Ton
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Date: 2023-11-17
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Comments and reviews: 23
Sarthak
Excellent video. I have 1 doubt please solve it.
From internet i saw this formula relation
GPM = 24TR/delta T
This is for water.
Now for derivation of this relation:
We know from heat equation
mcdeltaT = TR3. 52
Where m=mass flow rate of water in kg/sec, c= Specific heat of water in KJ/Kg-C, TR= Tonnes of refrigeration.
Now m = Densityvolume flow rate
Now putting, c = 4. 2 KJ/Kg-C and Density = 1000 kg/m3
We get,
4200Volume flow rate (m3/s) deltaT = TR3. 52
Solving, Volume flow rate = (3. 52/4200(TR/deltaT) m3/s
Now to convert it in GPM we know
1 m3/s = 15850 GPM
So,
V = 13. 3TR/deltaT
These 2 relation is not matching. Please check and tell where i am doing wrong. I have checked multiple times. Please help.
reply
Excellent video. I have 1 doubt please solve it.
From internet i saw this formula relation
GPM = 24TR/delta T
This is for water.
Now for derivation of this relation:
We know from heat equation
mcdeltaT = TR3. 52
Where m=mass flow rate of water in kg/sec, c= Specific heat of water in KJ/Kg-C, TR= Tonnes of refrigeration.
Now m = Densityvolume flow rate
Now putting, c = 4. 2 KJ/Kg-C and Density = 1000 kg/m3
We get,
4200Volume flow rate (m3/s) deltaT = TR3. 52
Solving, Volume flow rate = (3. 52/4200(TR/deltaT) m3/s
Now to convert it in GPM we know
1 m3/s = 15850 GPM
So,
V = 13. 3TR/deltaT
These 2 relation is not matching. Please check and tell where i am doing wrong. I have checked multiple times. Please help.
reply
Leland
This is semantics really and should not take away from the awesome video (I'll still buy you a coffee Paul) but the final calculation for BTU/h is not correct. I believe it was just a typo but it should be 8, 530, 355 BTU/h. If you figure 12000BTU per 1 RT. 12000 x 711 = 8, 532, 000. If you rather 3412. 142BTU per 1KW. 2500 x 3412. 142 = 8, 530, 355 BTU/h. BTW I have learned more watching your videos than studying any other format. Excellent work and I particularly like the blender 3D renderings of the machinery. Best wishes.
reply
This is semantics really and should not take away from the awesome video (I'll still buy you a coffee Paul) but the final calculation for BTU/h is not correct. I believe it was just a typo but it should be 8, 530, 355 BTU/h. If you figure 12000BTU per 1 RT. 12000 x 711 = 8, 532, 000. If you rather 3412. 142BTU per 1KW. 2500 x 3412. 142 = 8, 530, 355 BTU/h. BTW I have learned more watching your videos than studying any other format. Excellent work and I particularly like the blender 3D renderings of the machinery. Best wishes.
reply
education
Thank for your video, but Im still a little confused about the temperature difference. While chillers are turned on or off, the outlet temperature will change drastically causing the temperature difference also change. Should I take the temperature difference in the two time period as normal or there is another way to tackle it. Thanks.
reply
Thank for your video, but Im still a little confused about the temperature difference. While chillers are turned on or off, the outlet temperature will change drastically causing the temperature difference also change. Should I take the temperature difference in the two time period as normal or there is another way to tackle it. Thanks.
reply
jayson
nice video, excellent explanation. just a little bit error in some unit & results computation. i just have a question how can we design the building cooling capacity. meaning what cooling capacity do we install, pls. indicate all the parameter or the requirements for the right design. hope you answer my question. i wait for it.
reply
nice video, excellent explanation. just a little bit error in some unit & results computation. i just have a question how can we design the building cooling capacity. meaning what cooling capacity do we install, pls. indicate all the parameter or the requirements for the right design. hope you answer my question. i wait for it.
reply
Law
Hi Paul how r you?
Chillers circuit consist of 35% glycol & 65% water and you have mentioned specific heat capacity of water only? Is glycol has the same specific heat capacity as water? If not what is specific heat capacity mixture of water and glycol? and whats the density per kg?
Thanks Paul
reply
Hi Paul how r you?
Chillers circuit consist of 35% glycol & 65% water and you have mentioned specific heat capacity of water only? Is glycol has the same specific heat capacity as water? If not what is specific heat capacity mixture of water and glycol? and whats the density per kg?
Thanks Paul
reply
stan1488
hello 2 questions that I have
1 If using chiller manufacturers flow curve chart do i still need to add the n density factor or thats built into that?
2 Necessary to convert to Kelvin vs Celsius? more accurate?
thank you! stan
reply
hello 2 questions that I have
1 If using chiller manufacturers flow curve chart do i still need to add the n density factor or thats built into that?
2 Necessary to convert to Kelvin vs Celsius? more accurate?
thank you! stan
reply
sandeep
Nice video sir, could you please upload the video related to compressor capacity calculation of refrigeration system? Compressor is driven by electric power so why do we show capacity of compressor in TR instead of HP?
reply
Nice video sir, could you please upload the video related to compressor capacity calculation of refrigeration system? Compressor is driven by electric power so why do we show capacity of compressor in TR instead of HP?
reply
NSANGOU
Hi,
Great video! Thank you very much for sharing.
There is an error in the water density unit (in the definition): kg/m instead of kg/m3. But the wright unit is used in your calculation.
Best regards.
reply
Hi,
Great video! Thank you very much for sharing.
There is an error in the water density unit (in the definition): kg/m instead of kg/m3. But the wright unit is used in your calculation.
Best regards.
reply
Raj
Thank Sir, I have a question that same formula can be used for air medium to calculate the Air conditioner cooling capacity. Or any thing different to be used. If any pls make it as a video.
reply
Thank Sir, I have a question that same formula can be used for air medium to calculate the Air conditioner cooling capacity. Or any thing different to be used. If any pls make it as a video.
reply
Pulse
Hi Paul. Thank you so much for making engineering so simple to understand.
Requesting you to make a video on detailed sizing & component selection calculations for Chiller/Heat Pump.
reply
Hi Paul. Thank you so much for making engineering so simple to understand.
Requesting you to make a video on detailed sizing & component selection calculations for Chiller/Heat Pump.
reply
SYED
Hi, first of all I want to thank you for taking up our design knowledge to another level thru these videos, one request calculation of vrf/vrv outdoor unit will be really appreciated.
reply
Hi, first of all I want to thank you for taking up our design knowledge to another level thru these videos, one request calculation of vrf/vrv outdoor unit will be really appreciated.
reply
Subodha
Hey, small type at 6: 44. I believe the value of BTH/hr needs to be on the 8 million range, now its at 800 thousand range. Your imperial value at 9: 13 is correct.
reply
Hey, small type at 6: 44. I believe the value of BTH/hr needs to be on the 8 million range, now its at 800 thousand range. Your imperial value at 9: 13 is correct.
reply
Borra
I am using Brine(Methanol+water) as a fluid to maintain the temperature below -5, then how should I take the specific heat capacity, density and volumetric flowrate?
reply
I am using Brine(Methanol+water) as a fluid to maintain the temperature below -5, then how should I take the specific heat capacity, density and volumetric flowrate?
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Master
I'm a Master HVAC Tech. In New Jersey, I would be interested in you explain how to properly size FCU's ( chilled and heat)
How determine pump size. Thank you
reply
I'm a Master HVAC Tech. In New Jersey, I would be interested in you explain how to properly size FCU's ( chilled and heat)
How determine pump size. Thank you
reply
John
waoo cool video, I have Senior project deal with Thermal Energy system. after watching this video it open my mind how to get the job done. thank so much.
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waoo cool video, I have Senior project deal with Thermal Energy system. after watching this video it open my mind how to get the job done. thank so much.
reply
Toyin
Does the efficiency of a chiller stay constant for the life time of operation or does the efficiency fall with the chiller depreciating value?
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Does the efficiency of a chiller stay constant for the life time of operation or does the efficiency fall with the chiller depreciating value?
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Zeeshan
when we are calculating specific hear capacity & density of water so way we use 1 bar pressure with average temperature in table
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when we are calculating specific hear capacity & density of water so way we use 1 bar pressure with average temperature in table
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education
so, in short it's like E=mcdelta T, with rate of change (or take time derivative to get Q)
as taught in high school physics
reply
so, in short it's like E=mcdelta T, with rate of change (or take time derivative to get Q)
as taught in high school physics
reply
Aziz
Thanks a lot, it helps me a lot in calculating the cooling capacity inside a company to know how much tons we need to produce
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Thanks a lot, it helps me a lot in calculating the cooling capacity inside a company to know how much tons we need to produce
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syed
If the air cooled chiller is off but the bms valve ( actuator valve ) is open its not closing, What could be reason for this.
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If the air cooled chiller is off but the bms valve ( actuator valve ) is open its not closing, What could be reason for this.
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Bilal
If my load is not water like in this video. Do I use the density and specific heat of the liquid load I am using?
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If my load is not water like in this video. Do I use the density and specific heat of the liquid load I am using?
reply
hana
Hi can someone answer my question please. i have an exam soon. what happens if you increase the water flow rate?
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Hi can someone answer my question please. i have an exam soon. what happens if you increase the water flow rate?
reply
WIN
hi where can I get the value for thw
density average temp and specific heat average temp. thanks
reply
hi where can I get the value for thw
density average temp and specific heat average temp. thanks
reply
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