HVAC - Cooling coil + Calculations ❄️❄️❄️

In this video we take a look at the cooling coil for HVAC systems typical in Air handling units and Fan coil units to help you learn HVAC online. Essential building services engineering tutorials.

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[EngineeringMindset]

⚠️ *Found this video super useful?* Buy Paul a coffee to say thanks: ☕

[robertingersoll]

Good lesson. Small correction - the condensate water term should be negative.
energy in = energy out
h ent air = Q coil + Q condensate + h lvg air
Q coil = Delta air h - Q condensate

[kingkongtiger]

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)

[congthinh]

you teached me, HVAC and English. thank you!

[tiagoferreira]

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

[JayMehta]

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.

[jasonanderson]

Great stuff. Hope to see more about HVAC calculations in the coming videos. Well done

[basilhamdy]

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

[mohammadalshaikhhasan]

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?

[ABBITT]

A better teacher than the $3200 class my union provides.

[wojtek_sanitarnik]

Do you have video about BF & CF fsctors of cooling coil. That would be interesting video. Thanks!

[bhushanpawar]

Sir water inlet temp.to.the cooling coil in ahu is same as chiller set point temperature for calculating kw of cooling coil

[trisafesales]

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...

[ismailmasoodshaikh]

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

[jeffreyfontenot]

What about coil efficiency? Are we assuming 100% efficient heat transfer? What is a typical cooling coil efficiency?

[ramamanikantadondapati]

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.

[amitstorm]

can you give calculations steps for immersed helical coil in a stationary water tank carrying hot air?

[kuleyedi]

Could you also explain heating coil capacity? As far as ı know, at heating capacity we should not add humidity counts to Q and Other hand When we cool room, sometımes ıt concludes excessive humidity problems, how we get rıd of it technically. Thanks for efforts🙏🏻

[mohammadalshaikhhasan]

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

[nse]

Hi, I believe that your formula for Q should not include mw*hw, because this latent heat is included in ma*(h2-h1), am I wrong?