Electronic Controls

[Bones]

Hey guys, not sure if this is the right place to post this, but figured you guys would be the ones using digital/programmable controls the most...

my situation:
my boss is building a small coolroom for his up and coming fishing trip to the red centre... (Northern Territory, Australia). and he not being into computers, or anything to do with new technology advances within the last 10 years lol asked me if it was possible to get an electronic controller for his coolroom which would cycle the room when it got down to say -20 and come back on at say 5-10'c to conserve power through there generators/inverters etc to allow them to run other things for longer periods.

Being programmable, i would imagaine that all i would have to do would be set the paramaters anyway - as i have not been able to find out any specific operating ranges for the controls available here (Dixel) other then med/low temp... which makes me think you cannot insert your own differentials... and not playing around with them day to day thought i would ask the knowlege base here

[Mark]

Hi Bones

Have you thought of coldroom temperature pulldown times?.It may be a better to cycle c/u and fans when box temperature satisfied within a smaller differential ,as the pulldown times may be longer if the box temperature has risen to the set points you explain.
In other words the run time would be proportional to the associated box/product temperature.
There are a number of options regarding electronic temperature control my first question would be how much you want to spend?.

Kind regards mark

[Bones]

the box will have no fans, it is going to be fully constructed out of 100mm pannel... and he is going to use pate evaporators around all the internal walls and roof to i think.

because it will be loaded with ice fish etc... his idea is to run it down low, and if they want to move camps etc the room will be extra cool, as well as have long off periods once temp is acheived, with the nice insulation and the product being so cold...

i'm not sure exactly how much he wants to spend... he seemed interested at the prices of the dixell controlers.

after working on ice boxes with a similar setup... pull down time should be around 15 minutes to go from 35'c to 0'c and and about the same to get to his -20'c setpoint.

I'll have to take some photos of the finnished product, only being build out of scrap for the trip... if he gets motivated enough to finnish it off to meet the deadline of actually going lol... but you get that.

[chemi-cool]

hi bones,

what you need is plates like they use in icecream trucks.

you refrigerate down to -35 and the cold liquid in the plates, preserve the temp for as long as one day.
Eutectic plates is the name, you can install as many as you like.

check it out.

chemi

[Mark]

yes chemi eutectic plates could be used,however would the high price of eutectic plates not put him off.

[chemi-cool]

hi mark,

I am not dealing with bones`s boss finencial situation but trying to halp the young man

If not , bones will be happier to seat in the pub instead of making a fish box for his boss.

I am sure he is not getting any extra for doing it.

chemi