We have a dehumidifier Unit mfd by M/S Bry air. Air vol 1750cfm. we are facing with the RH Variation during night time. need your experiances in solving the problem.
What happens during night time the RH is higher than required.
Is the operation within the room is same as during day, viz: the internal heat dissipation load is same. But for some reason the some the heat dissipation within the room is less than what is during day time RH will increase with temperature also lower.
You may not have enough thermal input to allow regeneration using the higher humidity evening air. If you cannot get the ambient air hot enough, its higher humidity will prevent full regeneration of the desiccant- leading to increased RH output.
Check the air temps on a psych chart to see if you can extract adequate moisture with the ambient air and existing heaters. If the air volume will not support air leaving the regenerator at less than about 60% RH, you will have a problem extracting enough moisture to maintain equilibrium.
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NO MATTER HOW WELL YOU HAVE DONE SO FAR, ALWAYS TRY TO BE BETTER TOMORROW.
Dehumidifier you are referring may be stand alone within the conditioned space. The load during night may not be same as the during day time as there is insufficient internal Heat dissipation causing the higher RH.
Normally most of the units (AC system) are designed for summer condition , thus naturally other than summer conditions the load will vary. In some parts the monsoon load is more than summer due to high Humid conditions, if the plant is designed for summer condition you will have issues whenever the ambient is different than summer.
As ENERVAC indicated- it is certainly possible for "normal" ambient conditions to exceed "design" conditions, especially with moisture. Consider a rainy day at 85F (essentially 100% RH or a 85F wet bulb) in an area with a 95FDB/78FWB design conditions for HVAC. The total thermal content, and corresponding moisture content, will be significantly higher than at the "design" condition. This could be the problem relative to actual loading of the dryer but I still think that your ultimate issue is the ambient humidity affecting the regeneration capacity.
The dry-bulb/wet-bulb test that I referred to earlier will give you a reasonable check of that condition. IF the higher ambient moisture is causing the problem, higher regeneration air temperatures should resolve the issue. I suggest that you install an electric heater in series with your existing system (to activate if unit humidity exceeds set-point and to be de-activated under normal conditions).
You might also contact Bry-Air with the units model (and especially serial) numbers. They will be able to tell you the design conditions for your system- internal air being dried and ambient air used for regeneration- and may also be able to guide you toward resolution with a unit that is out of design range. Worst cast- you may need to purchase a supplemental unit- again, to be activated only when the primary system is unable to meet requirements.
__________________
NO MATTER HOW WELL YOU HAVE DONE SO FAR, ALWAYS TRY TO BE BETTER TOMORROW.
RH Variation in Dehumidifier Unit
Re: RH Variation in DH Unit
