Forum / THE MAIN WALL / MBH vs. BTU

## MBH vs. BTU (19 Posts)

• ### MBH vs. BTU

Can someone tell me this difference between a MBH and a BTU?
• ### Shorthand

• BTU is heat energy required to raise one pound of water one degree Fahrenheit. (It's actually more finicky, but this is close.) MBTU is 1,000 BTUs. "M" seems to come from old Roman numerals. Also common in printing when specifying quantity.
• ### Thanks

Many thanks on a Friday morning. Hope you guys have a good weekend.
• ### Not to be pedantic but

when I teach engineering (to architects) I dock them half a point for the "raise" by one degree answer. I give full credit for "change" temperature because when one gets, the other loses. Handy in cooling too. My students both love me and hate me :^)>

Brad, Not sure that that is an accurate statement. Cooling can't actually be added to an object or space. What makes an object or space seem cooler is actually the removal of heat. In an air conditioning or refrigeration system heat is actually moved from one space to another space. Such as; in a house, heat or BTU's are actually moved from inside the space to outside, essentially raising the temperature outside. This is noticed when your hand is placed on top of a condenser fan (the air will be warm). So a BTU can only raise the temperature. You actually have to remove BTU's to make something SEEM cooler. Not to be a wise A*#, just sounded like a fun argument. And I felt bad for the architects. kf
• ### Ah, Grasshoppa...

A Btu indeed IS defined as the amount of heat required to change a pound of water one degree Fahrenheit. As stated, by definition. That it is moved in one direction or the other makes no difference. One fluid loses, the other gains. When water is chilled for AC, it is BTU's removed. Still change. The vector (direction of heat flow and means) matters not. I never stated anything about "adding cooling", just the definition of BTU. p.s. Do not feel bad for the Architects. At least one of them switched to engineering!
• ### heat is \"required\" to cool?

> A Btu indeed IS defined as the amount of heat
> required to change a pound of water one degree
> Fahrenheit. As stated, by definition. That it is
> moved in one direction or the other makes no
> difference.
But heat is not "required" to cool something, although one can correctly say that heat is moved; or one can say that negative heat is required. The direction certainly makes a difference; try running the AC backwards! The use of language in science is very precise; it can't be used in any way one wants to, unlike general conversation.
• ### Indeed.

Moving heat is required to cool. Move heat from one point to another and the first point (object, fluid, what have you) will be cooled. The BTU is simply a measurement of heat quantity. It has no direction. Yes, you can run AC backwards as in a heat pump. It moves (and generates by heat of compression) what is measured in BTU's. Simply.
• ### A good page to bookmark:

Acronyms of the Industry
dan@heatinghelp.com

• ### That was ASAP!

:^)> And PDQ, too.
• ### WOPAC Boilers

Dan, Good list. I like “BER” which stands for Beyond Economic Repair. Reminds me of one that I used to use on invoices, so I did not offend the homeowner. They thought that their boiler was like a cat, with 9 lives. I thought it was a WOPAC. W.O.P.A.C. = Worn Out Piece Of Crap. :o) Regards Ed Carey
• ### WOPAC Boilers

Dan, Good list. I like “BER” which stands for Beyond Economic Repair. Reminds me of one that I used to use on invoices, so I did not offend the homeowner. They thought that their boiler was like a cat, with 9 lives. I thought it was a WOPAC boiler. W.O.P.A.C. = Worn Out Piece Of Crap. :o) Regards Ed Carey
• ### And to think

All this started due to a lack of coffee braincramp. Gotta' love this place!
• ### It's Friday again, and I've got plenty of coffee

> All this started due to a lack of coffee
> braincramp. Gotta' love this place!