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Mad Dog · June 2003

For a cooling requirement of 48,000 btus, what size (TONS?)unit would be required. Mad Dog

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ed wallace · June 2003

a/c tonnage

48,000 btus = 4 tons of coolong 12,000 btus = 1 ton of cooling

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Mike T., Swampeast MO · June 2003

A ton of cooling is roughly equivalent to 12,000 btu/hr. It's based on the cooling power of a ton of ice--literally.

Mad Dog · June 2003

What service !!!!!!!!!!!!!!!!!!!!

this wall is unbelievable. Thanks ED

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Mad Dog · June 2003

Really??? I love those old formulae!!!!!!!!!!

thanks Mike......md

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Mike T., Swampeast MO · June 2003

If the source(s) I've read are correct, it's based on a one-ton (US ton I believe) block of ice in the middle of a room.

Mike T., Swampeast MO · June 2003

Found a better definition

"One ton of refrigeration can get rid of the amount of heat that is needed to melt one short ton of ice in only 24 hours."

ed wallace · June 2003

a/c

you are welcome mad dog the other guys sid it better than i did

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Wayne_12 · June 2003

Don't forget

Don't forget to allow for 400 cfm/ton of cooling or in this case, that 4 ton unit needs to move 1600 cfm of air flow. The supply and return duct are large when dealing with 4 & 5 ton units. If the building has a high latent heat load, the cfm can be reduced to 350 cfm/ton. to remove moisture and longer run times. Good idea to place a freeze stat on the coil or suction line to prevent coil icing. There is less margin for dirty air filters, unused rooms and cool outside air temperatures. A high sensible heat load set the fan to deliver more air flow, 450 cfm/ton.
WD

Mark J Strawcutter · June 2003

ton not necessarily 12kbtu

A nominal 4ton concensor will deliver different btus with different coils.

The ARI ratings are a good source of info.

You need to determine latent and sensible heat loads, then find a condensor/coil combo that matches those values.

Mark

Bob Bona_4 · June 2003

latent

and sensible combined MD?

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ac

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