Cold Room Pressure

[Lauren]

Dear All,

Thanks for yr reply.
But based on our cold room design, we have 3 evaporators and each time defrosting (with hot gas at 45 deg C) take 30mins with fan is turn off for only one evaporator and the remaining 2 evaporators still operated as usual to maintain the cold room temperature at -20 deg C. Between, fan delay also applied.
We also have a vent port to equalize the cold room pressure.

With such design, would the cold room pressure still be affected by fan coil defrosting?
How much different if compared with outside pressure and cold room pressure at the same sea level?

I did some calcualtion and found out the cold air(-20 deg C) density is higher than normal air (33 deg C) density... hence the cold room air pressure is greater than atmospheric pressure (14.7 Psia).

Please kindly advise me. Many thanks.

[mad fridgie]

Dear All,

Thanks for yr reply.
But based on our cold room design, we have 3 evaporators and each time defrosting (with hot gas at 45 deg C) take 30mins with fan is turn off for only one evaporator and the remaining 2 evaporators still operated as usual to maintain the cold room temperature at -20 deg C. Between, fan delay also applied.
We also have a vent port to equalize the cold room pressure.

With such design, would the cold room pressure still be affected by fan coil defrosting?
How much different if compared with outside pressure and cold room pressure at the same sea level?

I did some calcualtion and found out the cold air(-20 deg C) density is higher than normal air (33 deg C) density... hence the cold room air pressure is greater than atmospheric pressure (14.7 Psia).

Please kindly advise me. Many thanks.

Please read what you have written, you have the answer.
I have given you a small clue

[NoNickName]

please read what you have written, you have the answer.
I have given you a small clue

rtoflmao :d