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How embarassing. The entire sizing of this system was futile, I had a small unit conversion error on my mass balance (multiplied 7.48 instead of dividing) and the real reject heat is only ~19,000 btu/hr. Lesson Learned: Double check those conversions before optimizing/sizing! I small plate...

Actually I've been looking into doping the closed loop water with EDTA. I also found a shell and tube made by ITT Fluid Technology that was in McMaster Carr. its 7'Dx29"L, 4 pass with 29 3/8" tubes, made of 316 stainless. None of the plate and frames listed meet our capacity though.

Well the oiler is going through a separate shell and tube installed by the compressor company. I believe these compressors have an allowable 21 psig drop anyhow. As for the makeup water flowing through these HXs I'll just spec out an appropriate sized pump. I was hoping to be able to avoid a...

Good points. That said, we don't have to use the EG/water mix. That's just was is used to cool ammonia compressors in other areas of the facility. The coolant water is strictly for sanitation. I think I'd better investigate what water codes are required. The city water flow can be adjusted...

Well actually from what I've read the chemicals that contribute to water hardness show reverse solubility. i.e. they precipitate out as you increase temperature. This EG water mix is prepared by a 3rd party contractor who also does the makeup water for our POS boiler system. It's possible he...

I dont mean to confuse. EG= Ethylene Glycol-water mix. Each air compressor has it's own shell and tube heat exchanger that cools the oil from the compressor down from about 225 deg F to 180 deg F shell side. On the tube side these units are using what I believe to be a 50/50 EG water mix that...

It's a direct gas fired system. Basically a packed tower with natural gas exhaust flowing up through stamped stainless steel rings with cool city water introduced from the top. Much better than the current boiler=>condenser system. Now the supports for the packing directly above the incoming...

Ah that sounds pretty good then. Footprint on this piece of equipment is important and this might work where the current defunct aftercoolers (~8-16 sqft) are now. I think in this instace with the ability to use city water this system could recover most of the energy. It's all low grade heat...

Reliability on this project is paramount. This system must operate every night for sanitation of food process equipment, so plant management basically want it over sized and redundant. I'll take your suggestion on the AL2003 and research into it alittle more before contacting my suppliers...

Hello, I'm trying to spec out a way to recover heat off two 400hp screw type air compressors. These units have (or will shortly) their own four pass heat exchangers using an EG/water mix as cooling on the tube side. The oil from the compressor is in a closed loop. Now the units developed by the...

Hi, I'm trying to decide if my company needs to step up to 316 grade stainless from 304 for our future direct gas fired heating system. The system will be operating at 170-190 deg F with city water that has a variable 100-150 ppm chloride content (lake/stream versus well water seasonally) I...