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HVAC Calculations

11/09/2016 12:38 AM

I'm learning about HVAC terminology such as how to calculate CFM /BTU/L/S , Change temperature ?

please share our knowledge in form of step by step about this subject specially from HVAC engineer/specialist

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#1

Re: HVAC calculations

11/09/2016 12:55 AM

First step!

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#2

Re: HVAC calculations

11/09/2016 1:26 AM

It takes a whole book (or more) to cover that; not practical to do in a series of forum posts. Some good references are:

Carrier Handbook of Air Conditioning
Modern Refrigeration and Air Conditioning, by Althouse/Turnquist/Bracciano

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#3

Re: HVAC calculations

11/09/2016 2:25 AM

Here's a sample of what you can find by searching:

Free Software | ashrae.org

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#6
In reply to #3

Re: HVAC calculations

11/10/2016 9:35 AM

And ASHRAE the manual is handy as well.

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#4

Re: HVAC calculations

11/09/2016 2:50 AM
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#5

Re: HVAC Calculations

11/10/2016 12:26 AM

Go to the websites of these three companies.

1.Johnstone Supply.

2. United Refrigeration.

3. R.E. Michael.

All three of these companies have online catalogs and paper catalogs. In their catalogs, you can order various books that will explain and educate on all areas of heating, ventilation & air conditioning.

Plus you can also order books that cover systems and control specific areas. Most of these books are written in easy to understand language and have detailed drawings and images.

While there have been constant updates in the HVAC community, the basics have remained the same. I purchased many of my books used and secondhand and saved a great deal of money

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#7

Re: HVAC Calculations

11/11/2016 9:35 AM

To calculate CFM - define it: It means cubic feet (of air flow) per minute. Or it could mean CFM of natural gas flow in a large heating system.

BTU - British Thermal Unit defined the the quantity of heat required to raise the temperature of one British pound of water (at a specified starting temperature of typically 60 °F) by one degree Fahrenheit. The unit of measurement bears a constant relationship to the same in SI units, 1 BTU = 1.05505585262 kJ

If you meant CFM/BTU/L/S as a distinct unit of measure, what are you measuring?

That would read "cubic feet per minute per British Thermal Unit per Liter per second"

That one, unfortunately, leaves me slightly baffled this morning.

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#8

Re: HVAC Calculations

11/15/2016 12:15 AM

Thank every one who responded here, I know there are many books available online for HVAC but those books has much details which may I don't need it I'm looking for a simplified steps to calculate to design , select HVAC system including , cooling capacity required , ducts sizing , AC machine sizing and other details that need in Metric system and weather conditions for Dubai, UAE , so kindly dear HVAC Engineer & expert please provide a example here and calculate ever thing in HVAC step by step so very one can share the knowledge.

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#9
In reply to #8

Re: HVAC Calculations

11/15/2016 3:46 AM

You are asking for a large knowledge base, not easily condensed into a few forum posts.

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#10
In reply to #8

Re: HVAC Calculations

04/10/2017 4:57 AM

I don't see enough information in your post to properly respond to your request. You seem to be asking us to propose your bid on a project. Without specific information to work with this would be very difficult. I could spec out a system for a one family, three bedroom house or a luxury apartment building with pretty much the same calculations but without knowing more about your project and timeframe...

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