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ronaldjaysonm
28-09-2009, 11:23 AM
dear sir,

please post some rule of thumbs in heat load calculations.depending on the room and temperature.

1.)blast freezer
2.)cold storage room
3.)chiller rooms
4.)anterooms

and other room with other applications for more accurate design and heat load calculations.

powell
28-09-2009, 12:38 PM
Here's a link to Heatcrafts manual. Read it through and you'll have your answer.

http://www.hvacrinfo.com/ (http://www.hvacrinfo.com/)

Go to:

Refrigeration System Design & Operation

Heatcraft Engineering Manual

nike123
28-09-2009, 01:39 PM
dear sir,

please post some rule of thumbs in heat load calculations.depending on the room and temperature.

1.)blast freezer
2.)cold storage room
3.)chiller rooms
4.)anterooms

and other room with other applications for more accurate design and heat load calculations.


"more accurate design" and "rule of thumb" in same sentence is oksymoron (http://en.wikipedia.org/wiki/Oxymoron).;)

Brian_UK
28-09-2009, 10:45 PM
"more accurate design" and "rule of thumb" in same sentence is oxymoron (http://en.wikipedia.org/wiki/Oxymoron).;)
Well, he is a design engineer ;)

mad fridgie
29-09-2009, 01:18 AM
Rule of thumb.

Go to the postion of where the new room is going.
Take 10 steps back.
Place thumb 25mm away from left eye. (close right eye)
If you can see the proposed room (area) passed your thumb, then take on step back. Make sure you count the steps back.
Repeat until you can no longer see the proposed room.
Have you counted your steps, yes?
Well for HT rooms 1hp per step
for LT rooms 1.5Hp per step.

mad fridgie
29-09-2009, 01:19 AM
Now your are a design engineer, please keep the above post a secret!!!!!!!!!!!!!!!!!

Brian_UK
29-09-2009, 11:30 PM
Rule of thumb.

Go to the postion of where the new room is going.
Take 10 steps back.
Place thumb 25mm away from left eye. (close right eye)
If you can see the proposed room (area) passed your thumb, then take on step back. Make sure you count the steps back.
Repeat until you can no longer see the proposed room.
Have you counted your steps, yes?
Well for HT rooms 1hp per step
for LT rooms 1.5Hp per step.
Excellent method, I must cut and paste that one for my notebook. :D

mad fridgie
29-09-2009, 11:39 PM
Excellent method, I must cut and paste that one for my notebook. :D
Nothing is free in this world, it will cost you a beer:D copyright rules?

Brian_UK
29-09-2009, 11:58 PM
Nothing is free in this world, it will cost you a beer:D copyright rules?Sorry, don't do beers only forum doughnuts (donuts). :D

mad fridgie
30-09-2009, 12:17 AM
Sorry, don't do beers only forum doughnuts (donuts). :D
Deal done YUM YUM

nike123
30-09-2009, 05:07 AM
Excellent method, I must cut and paste that one for my notebook. :D
Be sure that is encrypted and password protected.:eek:

Magoo
30-09-2009, 05:25 AM
Man, one term., I really hate with a passion is "rule of thumb ".
Every application requires a design for load, product , location, if you do not know the system. Start a career change.

abet_meneses
30-09-2009, 02:42 PM
ronaldjayson,

Forget that thumb rule ,do the calculation the old way,i mean the long hand computation.try to avoid using the manufacturer software as much possible.No shortcuts.

regards,