Question about Heating & Cooling

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Posted on Jan 02, 2017

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Just reset everything,it sounds like your t-stat is defective

Jul 08, 2015 | Honeywell Electronic Programmable...

CFM is air flow, a product of fan size and speed and duct size, opening sizes etc.. The tonnage of the unit has no bearing on airflow.

Apr 01, 2015 | Cfm Heating & Cooling

There is no equivilancy between the two...pounds of thrust would be 'foot pounds of torque' and cfm is the amount of air delivery is passing a specific sized opening in cubic feet per minute.

If you are looking at how much pressure is in for instance a residential air conditioning system, they are typically designed for .5"w.c. total system static. Meaning the pressure in the supply air duct plus the negative static added together cannot exceed .5" of water column. Approximately 28" w.c. per pound of pressure and we don't want any more than 1/2 of one inch water columm....

Now if you're talking about turbo-chargers....thats a different story and I haven't a clue.

If you are looking at how much pressure is in for instance a residential air conditioning system, they are typically designed for .5"w.c. total system static. Meaning the pressure in the supply air duct plus the negative static added together cannot exceed .5" of water column. Approximately 28" w.c. per pound of pressure and we don't want any more than 1/2 of one inch water columm....

Now if you're talking about turbo-chargers....thats a different story and I haven't a clue.

Mar 04, 2015 | Cfm Heating & Cooling

Hi,

CFM is short for cubic feet per minute....

It is usually used in relation ship to air movement...

It is a unit of measurement for the amount of air that it moving through say a furnace, blower, or duct...

heatman101

CFM is short for cubic feet per minute....

It is usually used in relation ship to air movement...

It is a unit of measurement for the amount of air that it moving through say a furnace, blower, or duct...

heatman101

Jan 16, 2011 | Microwave Ovens

12000 BTU is 1 ton

300 - 350 CFM in 1 ton depends on mfg.

Cfm and Tonnage of Refrigerent is are different units, then how these two units can be compared

Cfm means air flow per cubic meter per hour.

300 - 350 CFM in 1 ton depends on mfg.

Cfm and Tonnage of Refrigerent is are different units, then how these two units can be compared

Cfm means air flow per cubic meter per hour.

Dec 14, 2010 | Cfm Daikin R410a Split System Air...

their is a chart that homedepot use to give in a/c dept may still be their but a 6" run is about 100 cfm this will cover 10x10 1 sq inch is 1 cfm 1 ton is 400 cfm a gas system is 400 per ton and a heat pump is more like 425 but is best to figure the 400 cfm for both say you got 12x10 room that is 120 sq ft so you need around 120 cfm and if the 6" duct is 100% hard pipe with no flex you can get that if you balance your air if more help is needed email pendletonheatandair@hotmail.com please give me a vote and rating

Sep 22, 2010 | Cfm Heating & Cooling

Hi,

To size that return duct you need to know the cfm of the unit, and size according to that...Ell's and distance also need to be factored in....

Here is a free duct calc. that you can use to help you size you ductwork...

Here is a website that will let you get a free trial duct calc.

http://efficientcomfort.net/Calculators.html

Here is another free duct clac...

http://duct-sizing.downloadsoftware4free.com/

Heatman101

To size that return duct you need to know the cfm of the unit, and size according to that...Ell's and distance also need to be factored in....

Here is a free duct calc. that you can use to help you size you ductwork...

Here is a website that will let you get a free trial duct calc.

http://efficientcomfort.net/Calculators.html

Here is another free duct clac...

http://duct-sizing.downloadsoftware4free.com/

Heatman101

Sep 21, 2010 | Coleman Heating & Cooling

Owner found the original set of design drawings. Added up the total cfm of the outlets, and modelled the duct system to find the design static pressure. At this stage of it's life, we're limiting the AHU to only 3/4 of design load.

Nov 14, 2009 | Heating & Cooling

There's a thumb rule in A/C air distribution. At 1 TR load, the air supply is about 400 CFM and the ideal diffuser size is 16" x 16" with an effective flow area of about 70%. Branch duct size for this outlet should be around 12" x 12".

Jun 20, 2009 | Carrier Heating & Cooling

Here are a few ways to calculate your BTU's.

Get ready to use that algebra you thought you'd never use.

1 Ton = 12000 BTU's

400cubic feet per minute (CFM) = 1 Ton on standard ac units (300 is an absolute minnimum)

BTU's air heat = difference in temp. ( ∆T ) x 1.08 x CFM

∆T = BTU's / (1.08 x CFM)

i.e. 65◦F entering your unit and 93◦F air leaving on a 12000BTU unit.

∆T = 28

CFM = 400

28 x 1.08 x 400 = 12096BTU's

Another way...

Electric heat calculations.

BTU's = KW (killowatts) x 3413

Watts = Volts x Amps (single Phase) Most Homes))

Watts = Volts x Amps x Phase (this is for three phase units.)three wires and a ground))

120 volts 30 amps single phase (common)

120 x 30.0 x 1 = 3600 or 3.6KW 3.6 x 3413 = 12286BTU's

Get ready to use that algebra you thought you'd never use.

1 Ton = 12000 BTU's

400cubic feet per minute (CFM) = 1 Ton on standard ac units (300 is an absolute minnimum)

BTU's air heat = difference in temp. ( ∆T ) x 1.08 x CFM

∆T = BTU's / (1.08 x CFM)

i.e. 65◦F entering your unit and 93◦F air leaving on a 12000BTU unit.

∆T = 28

CFM = 400

28 x 1.08 x 400 = 12096BTU's

Another way...

Electric heat calculations.

BTU's = KW (killowatts) x 3413

Watts = Volts x Amps (single Phase) Most Homes))

Watts = Volts x Amps x Phase (this is for three phase units.)three wires and a ground))

120 volts 30 amps single phase (common)

120 x 30.0 x 1 = 3600 or 3.6KW 3.6 x 3413 = 12286BTU's

Aug 09, 2008 | LG BG8000ER Air Conditioner

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