Results 1 to 5 of 5
Thread: Freezer Room PRV
-
12-09-2011, 10:46 AM #1
Freezer Room PRV
Years ago I had a quick spreadsheet calculation to determine the size of a room PRV, sadly that laptop is no more. Unfortunately, I dont know where I got the information from and have been asked to prove how I selected the number of PRVs installed. Can anyone help?
Refrigerated Trailer Rental
-
12-09-2011, 07:58 PM #2
Re: Freezer Room PRV
Try www.totaline.com
they have some caculating sheets.
-
12-09-2011, 10:26 PM #3
Re: Freezer Room PRV
Hi cclpaul.
Sorry I have not found any software yet but I have found a written explanation of how to calculate relief Vales sizes etc.
The pressure relief valve, see Figure 9 equalizes internal and external pressures to reduce the possibility of these problems occurring. The number and size of the relief valves can be calculated using the following formula:
Where A is the required venting area in m2, Q is the rate of heat production or extraction in the cold store in kW, T is the cold store temperature in °C and P is the allowable pressure difference from store to outside, in N/m2 or Pa.
It is recommended that at least the following Q values should be considered when determining the maximum possible value of Q to be used in the formula:
- Maximum possible rate of extraction.
- Maximum possible rate of heat input during defrosting.
- Maximum rate of heat input during any possible transient conditions, such as might arise after a defrost, if cold air were blown through a hot finned cooler.
Grizzly
-
13-09-2011, 01:36 AM #4
Re: Freezer Room PRV
Grizzly
Your a dark horse mate...been keeping your extra talents well hidden well until now
I can gauge from that the sort of info you have stored upstairs
R's chillermanIf the World did not Suck, We would all fall off !
-
13-09-2011, 05:16 PM #5
Re: Freezer Room PRV
Thank you all, I will write it down at the front of one of my books this time.
Refrigerated Trailer Rental