HVAC - Cooling coil + Calculations
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Date: 2023-11-17
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Comments and reviews: 27
Tiago
Hi! Thank you for your great job! You really understand a lot of things about hvac systems and their components! Please don't stop and continue the great job!
Just gonna suggest some themes that I find interesting to understand better so you can maybe had to your list, if you find them interesting:
- the various psychometrics evolutions of the air passing through the coils and other components (water cooling and heating coil, dx heating and heating coil, just an electrical resistance, humidification and dehumidification, and maybe others)
- how a boiler works and main components (domestic ones (traditional and condensation ones) and industrial ones as you show in one of the videos)
- how other type of cooling towers works
- the tabs systems (thermo active building systems)
Thank you once again and sorry for possible bad english
Best regards
reply
Hi! Thank you for your great job! You really understand a lot of things about hvac systems and their components! Please don't stop and continue the great job!
Just gonna suggest some themes that I find interesting to understand better so you can maybe had to your list, if you find them interesting:
- the various psychometrics evolutions of the air passing through the coils and other components (water cooling and heating coil, dx heating and heating coil, just an electrical resistance, humidification and dehumidification, and maybe others)
- how a boiler works and main components (domestic ones (traditional and condensation ones) and industrial ones as you show in one of the videos)
- how other type of cooling towers works
- the tabs systems (thermo active building systems)
Thank you once again and sorry for possible bad english
Best regards
reply
MOHAMMAD
Thanks for the great video. so helpful
In case we have AHU designed and the evaporator coil sized to specific capacity, can we increase the airflow to achieve higher capacity?
A chiller designed to specific capacity and connected to AHU to achieve a certain indoor temperature and air change rate, whats could happen if the AHU coil changed to another one smaller with the same high air flow?
The face velocity will be higher?
The effects on sensible capacity?
The effects on latent capacity?
Thanks again
reply
Thanks for the great video. so helpful
In case we have AHU designed and the evaporator coil sized to specific capacity, can we increase the airflow to achieve higher capacity?
A chiller designed to specific capacity and connected to AHU to achieve a certain indoor temperature and air change rate, whats could happen if the AHU coil changed to another one smaller with the same high air flow?
The face velocity will be higher?
The effects on sensible capacity?
The effects on latent capacity?
Thanks again
reply
education
hi. i have a question in different subject if you can help
in evaporative cooling. is it useful to decrease the temp of water spry or water washer
ex: if out air 36c, 60%rh. on psy with 90% evaporative efficiency. h ll get a 28c db and 90%rh.
so if i enter a 7c cold water to the washer. will i get a cold air temp. with knowing that in 100%humidity the db is about 27c
thanks
reply
hi. i have a question in different subject if you can help
in evaporative cooling. is it useful to decrease the temp of water spry or water washer
ex: if out air 36c, 60%rh. on psy with 90% evaporative efficiency. h ll get a 28c db and 90%rh.
so if i enter a 7c cold water to the washer. will i get a cold air temp. with knowing that in 100%humidity the db is about 27c
thanks
reply
Jay
Hi, thanks for the video!
How do you select a coil to be used in order to achieve a desired cooling capacity? In other words I would like to understand how must I design the coil geometry to achieve certain cooling capacity, with the water inlet & outlet temps. known, air entering temp known etc.
reply
Hi, thanks for the video!
How do you select a coil to be used in order to achieve a desired cooling capacity? In other words I would like to understand how must I design the coil geometry to achieve certain cooling capacity, with the water inlet & outlet temps. known, air entering temp known etc.
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Richard
good day kind question for this group, i just want to know if there is a formula for cooling capacity which fcu is converted from dx to chilled water or how many percent does of cooling load will be lost if converted, thank you who ever answers,
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good day kind question for this group, i just want to know if there is a formula for cooling capacity which fcu is converted from dx to chilled water or how many percent does of cooling load will be lost if converted, thank you who ever answers,
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MOHAMMAD
Perfect and useful.
I wish new videos about cooling coil water pressure drop and air pressure drop.
but for the latent heat cooling load calculation, you assumed hw = hf ( heat of vaporization vs heat of saturated liquid. why?
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Perfect and useful.
I wish new videos about cooling coil water pressure drop and air pressure drop.
but for the latent heat cooling load calculation, you assumed hw = hf ( heat of vaporization vs heat of saturated liquid. why?
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KKd)
Thanks for the great video. Please make more videos on HVAC system designs with calculation in different buildings. (May be start with something like single zone design with cooling load & fresh air requirement etc)
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Thanks for the great video. Please make more videos on HVAC system designs with calculation in different buildings. (May be start with something like single zone design with cooling load & fresh air requirement etc)
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Munkhtulga. U
Hello The engineering mindset. I would like to study more about HVAC system. And planning to study abroad. Is there any recommendation which is good university or course? Hope you will reply asap Thank you
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Hello The engineering mindset. I would like to study more about HVAC system. And planning to study abroad. Is there any recommendation which is good university or course? Hope you will reply asap Thank you
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Malik
Pual my question is when three way valve is activated then in this situation how much water enters into the cooling coil? Or water completely bypass the cooling coil and goes back in to return line.
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Pual my question is when three way valve is activated then in this situation how much water enters into the cooling coil? Or water completely bypass the cooling coil and goes back in to return line.
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Trisafe
Hi Paul, superb illustrations and explanations. Just one small doubt Do we have to get RH of 100% for air coming out from the cooling coil in order to achieve the desired cooling effect.
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Hi Paul, superb illustrations and explanations. Just one small doubt Do we have to get RH of 100% for air coming out from the cooling coil in order to achieve the desired cooling effect.
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Honest
We can make industries but the citizens, politicians and bureaucrats are utterly corrupted in Bangladesh. So I don't dare to make and to run the business on it. Thanks from Bangladesh.
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We can make industries but the citizens, politicians and bureaucrats are utterly corrupted in Bangladesh. So I don't dare to make and to run the business on it. Thanks from Bangladesh.
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Ramamanikanta
Sir you are saying the relative humidity is 100 persent. But human comfort is 50-55 percent. And also please make an video about relative humidity, specific humidity, dewpoint.
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Sir you are saying the relative humidity is 100 persent. But human comfort is 50-55 percent. And also please make an video about relative humidity, specific humidity, dewpoint.
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Ismail
Thanks for this very useful information, can you please let me know the water side pressure drop of cooling coil and the refrigerant required in DX coils for 1 TR of cooling
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Thanks for this very useful information, can you please let me know the water side pressure drop of cooling coil and the refrigerant required in DX coils for 1 TR of cooling
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ANANTH
Our Indoor design will be 23C, RH - below 60 %.
in this case the air which coming out from coil air having almost 100% RH! Here how will you control this RH Level?
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Our Indoor design will be 23C, RH - below 60 %.
in this case the air which coming out from coil air having almost 100% RH! Here how will you control this RH Level?
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Judas-Priest
You sound Aussie. I assume you're a mech engineer working in HVAC. How's the HVAC job market? I'm planning on heading back to uni to study engineering.
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You sound Aussie. I assume you're a mech engineer working in HVAC. How's the HVAC job market? I'm planning on heading back to uni to study engineering.
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Zee
Does the relative humidity affect the enthalpy?
According to the air properties i find 99 kJ/kg for h1. But paul uses 78 kJ/kg. What is the reason for this?
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Does the relative humidity affect the enthalpy?
According to the air properties i find 99 kJ/kg for h1. But paul uses 78 kJ/kg. What is the reason for this?
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Ali
Thanks for this helpful video. I have a question about the air pressure drop, how to calculate it? If you can provide me with some sources it will be better
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Thanks for this helpful video. I have a question about the air pressure drop, how to calculate it? If you can provide me with some sources it will be better
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Basil
Please can you tell us what is the next step after calculate the cooling coil capacity, how to select the correct coil for your application
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Please can you tell us what is the next step after calculate the cooling coil capacity, how to select the correct coil for your application
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Like&Share
Hi, I believe that your formula for Q should not include mwhw, because this latent heat is included in ma(h2-h1, am I wrong?
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Hi, I believe that your formula for Q should not include mwhw, because this latent heat is included in ma(h2-h1, am I wrong?
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Luke
Dont you need the Dt to be able to ascertain the 4. 67kg/s? How would you have this info without knowing the delta to begin with?
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Dont you need the Dt to be able to ascertain the 4. 67kg/s? How would you have this info without knowing the delta to begin with?
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Bhushan
Sir water inlet temp. to. the cooling coil in ahu is same as chiller set point temperature for calculating kw of cooling coil
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Sir water inlet temp. to. the cooling coil in ahu is same as chiller set point temperature for calculating kw of cooling coil
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Jeffrey
What about coil efficiency? Are we assuming 100% efficient heat transfer? What is a typical cooling coil efficiency?
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What about coil efficiency? Are we assuming 100% efficient heat transfer? What is a typical cooling coil efficiency?
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Zeeshan
Can u tell me about coil in ahu.
Meaning of 4/6 row coil.
When we'd day this ahu is 4 row or any row?
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Can u tell me about coil in ahu.
Meaning of 4/6 row coil.
When we'd day this ahu is 4 row or any row?
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DANTHE
How come you have 100% RH when the air has been conditioned through the cooling coil? Keep up the good videos
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How come you have 100% RH when the air has been conditioned through the cooling coil? Keep up the good videos
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Butch
The specific humidity unit in the condensate water mass flow rate calculation is wrong. It should be in kg/kg.
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The specific humidity unit in the condensate water mass flow rate calculation is wrong. It should be in kg/kg.
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partha
In the cooling load calculation, Q_dot should be negative i. e. -78. 5 KW. Why have you taken it positive?
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In the cooling load calculation, Q_dot should be negative i. e. -78. 5 KW. Why have you taken it positive?
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Amit
can you give calculations steps for immersed helical coil in a stationary water tank carrying hot air?
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can you give calculations steps for immersed helical coil in a stationary water tank carrying hot air?
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