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How to calculate recovery time for a house in cooling mode?

How to calculate recovery time for a house in cooling mode?

How to calculate recovery time for a house in cooling mode?

(OP)
Hi guyz,
I am totally new to this site and looks like its a great place to post questions regarding engineering.
Anyways I am trying to calculate the approximate time required to recover the house temperature when going from unoccupied to occupied mode in cooling cycle. Thanks.

RE: How to calculate recovery time for a house in cooling mode?

First order approximation is:

V*Cp*dT/Qx

where

V is the volume of the space
Cp is the volumetric heat capacity of air
dT is the difference between unoccupied and desired temperature
Qx is the quasi-instantaneous excess capacity of your cooling system.

RE: How to calculate recovery time for a house in cooling mode?

(OP)
Hi MintJulep,
Thanks a lot for your reply, but can you please explain how can I find out the Cp and Qx? Thank you.

RE: How to calculate recovery time for a house in cooling mode?

Cp you look up.

Qx is rather more difficult.  You could get a reasonable feel for the system's cooling capacity from the compressor's performance curves.  The excess capacity is the difference between that and the cooling load at the same conditions.

RE: How to calculate recovery time for a house in cooling mode?

(OP)
Thanks a lot MintJulep. I'll look into it.

RE: How to calculate recovery time for a house in cooling mode?

(OP)
I have given you a star MintJulep.  

RE: How to calculate recovery time for a house in cooling mode?

That's a great formula... I was going to recommend a stopwatch smile

RE: How to calculate recovery time for a house in cooling mode?

stopwatch trumps a flux capcitor  

Take the "V" out of HVAC and you are left with a HAC(k) job.

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