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Thanks TwinScrew, this was ALOT of help. I did have two more questions though. How old is this letter? Where does this 4lbs of refridgerant change per ton of the unit come from? If you know those answers that would be great if not I can work without them. CB EngA

Units are 40 ton units. Thank you for the link. That helps some. If nothing else it gives me some ammo since the rep gave me a condensing temp of 105F when the ambient temp is 105F, I think we all know that isnt going to happen. CB EngA

My company produces products that sanitize and correct odor problems in the air. We use UV lights for sanitization and Ozone plates that make the air odor free. Usually only see these products at waste water treatment plants. We sometimes see UV lights at hospitals, but we dont do food grade...

I had a rep from Carrier tell me today that if he used his condensing unit with Semi's that he could pipe 250' of refridgerant no problem. He doesnt know that I have a Carrier book as well, and all he is using is a chart that has tonange vs. length of line on a logrithmic scale. This scale goes...

I guess I am just too lazy for that. I stick to the example problems now that I am out of school if I need a refresher on problems. In school I most definately used the solution manual to all of my books, but it sounds as if the book does not have a solution manual anyway. If the publisher said...

Then I think the question deserves to be asked. What do you need a solution manual to a text book for?

I believe the screen is meant to keep stuff out of the vent, BUT it could actually be the opposite and the screen is supposed to be keeping stuff in. I would do the test both ways with various size of material and screen size.

My company builds what you are talking about, we call them ground source heat pumps. Also they are called "california loops" you can google either phrase and it should give you a mess of results and information. Probably more information than you need.

One other thing, i dont think conserving the amount of humidification needed is really a concern. This is in Houston! I mean if you can run fast enough and jump, you can swim through the air!!!

Yeah I do not disagree with that logic at all Zesti! But we are talking about a clean room, so actually even though you probably meant it as a joke, the workers ARE in suits which is why I think even the mention of the possibility of carry over to the engineer would make him freak out. Heat...

Not saying you are wrong, just disagreeing. We as a rule dont use wheels when exhausting anything with contaminants in it. To us the idea of having a 100% OA air unit is to have "clean" air coming in. The idea, to me, to use 100% OA here is because you are trying to exhaust air you dont want in...

Zesti, in this application a rotary heat exchanger will have partial contamination carry over, this a bad thing if the exhaust has chemicals and odors you are trying to get out of the room.

Haha you worked for EngA? Thats who I currently work for. Good company with a solid product I believe.

Heat pipe would be a good way to go. No cross contamination and good energy recovery. I would suggest giving the chicago office a call and see what they can do for you.

Engineered Air, has UV lights, Ozone plates for oder control, sales men will help you out alot with equipment selection, units can be built all stainless steel with washdown construction. The equipment is all 100% custom so whatever you can think up they can do. They have a sales office in...

dblyle, I work for a company that designs and sells dessicant dehumidifiers like you are talking about using and here are some things to consider. You will need to have hot DRY air going through the wheel to reactivate it. You will need to check with Munters to see what frost prvention they...

I agree with MintJulep, but i would warn against slowing down your evaporator fan. I design and sell equipment like this and we are always getting calls about broken coils or undersupplied air because someone has decided to slow down the supply fan without consulting us. Also if the fan curve...

zesti is right your coil will already be having frost issues on your evaporator coil, and is right about the amount relative humidity entering the unit, but I must say that actually doesnt matter. If you are cooling air down to 38F you are going to be at the dew point unless you reheat it...

You have to remove the moisture... That means cooling it down to a point where you can reheat it back up to 38F.

But I will answer a couple of your questions. keep in mind these numbers may or may not apply to your specific situation, they are just ball park figures for a "grocery store". 350 sq.ft./ton 125 sq.ft./person 15cfm/person. But I would say not to take those figures to heart. They...