Re: A curly load calculation
Hi Goober.
No wonder your head has gone!
With the info you have supplied It does indeed not make sense!
The heat loads being introduced are erratic and unstable, sounds like a lot of blast freezers I have visited.
Good Luck Grizzly
Re: A curly load calculation
Hi Goober.
develop a heat load profile, work from there. Add base structural load as a given.
PM if you want to.
Sounds like a cheese curing /maturing system.
Re: A curly load calculation
:) sounds like a fun project. These conundrums makes the job more interesting than the usual.
As Magoo says profile the load, you are only varying your mass and pull down time over the seven days. Then it is stable for pull down and hold temp.
The controlling of plant is way more involved than the load calc as you need to vary your heat exchange surface theoretical size while I am guessing maintaining close RH control.
You will also need to consider ambient infiltration during loading and product entering temp variances to give a stable control strategy over the seasonal changes.
Re: A curly load calculation
You are right. Till there is a loading in the room & unless the each day's loading is in a way separated out, the temperatures shall be fluctuating & getting two weeks pull down period seems unrealistic.
So after the last day of loading the pull down period can be considered.
Plus what our experience shows that the earlier cooled material gives out its temperature when fresh material is loaded & undergoes temperature shocks till the entire loading is complete.
This is typically a scene in cooked products line & they are chilled before freezing & the loading keeps taking place through out the day till the production is on.