How to estimate the heat generated from the wash station?

[sfxf]

I am working on a project, and need to estimate how much heat is generated from the wash station using hot water spray at 100 F. The overall flow of the hot water spray is 5 gpm. If the wash station is exhausted at 3 cfm/sq ft, do I still need to cool the space? The wash station is enclosed in an air-conditioned space and very little cooling load from lighting and people. Thanks for help!

 

[LSA]

I am not 100% sure what "Wash station" refers to. But from a general approach, I would say...
You need to provide enough air (either make-up or transfer) to balance the air being exhausted. Most likely the wash station is designed to be NEGATIVELY pressurized to keep fumes and oder from escaping the area. Therefore, the exhaust air CFM will be more than the supply, makeup air or any transfer air CFM in that space. The CFM amount depends on your assumptions and/or design criterions.

This is my general understanding of the situation...Hope it a start in the right direction for you.

LSA

 

[sfxf]

Thanks,LSAxDesigner. It is good point to provide negative pressure at the wash booth. What I am trying to figure out is how much cooling the wash booth needs to keep it at 75 deg F. I came up the formular: total cooling load in Btu/hr = 10 gpm (total hot water flow through spray nuzzlers) * 500 * 25(temperature difference between the hot water and wash booth)=125,000 Btu/hr. I would like to hear second opinion. Thanks again!

 

[CRG]

If I understand correctly, the majority of water should be going down the drain. Hence your delta T would be the temperature of water coming into the wash station minus the temperature of the water going down the drain. You could assume that the air leaving the station will be leaving with an RH of 100%. Calculate the mass of water evaporating and the enthalpy of vaporization and see if it has an affect worth dealing with. Assume that the wetted portion of the station will have a temp slightly less than the water temp. Look at the heat gain from the wetted surfaces. Decide what is important and make an energy balance for the station. At this point you should have a good idea as to the amount of heat gain in the space.

What is the temperature of the space directly outside of the wash station?
Can you use transfer air and accept a slightly higher temp in the wash station than in the adjacent space? If you position a transfer air duct to impinge on the wash station operator and then exhaust it above the area that creates most of the heat gain, it might be acceptable solution.

 

[sfxf]

Thanks, CRG. The space directly outside of the wash booth is air-conditioned and is at 75 F.

 

[sfxf]

It shall be OK to provide exhaust in the wash booth, and transfer the conditioned air through transfer grille at wall.