How to calculate recovery time for a house in cooling mode? 1

[lchandna]

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.

 

[MintJulep]

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.

 

[lchandna]

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

 

[MintJulep]

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.

 

[lchandna]

Thanks a lot MintJulep. I'll look into it.

 

[lchandna]

I have given you a star MintJulep.

 

[ChrisConley]

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

 

[AbbyNormal]

stopwatch trumps a flux capcitor

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