glycol in chilled water system - HVAC-Talk
WEBJul 27, 2012 · Glycol in chillers. You lose approximately 25% of your heat transfer rate in a 50/50 mix. You're gonna run lower suction pressure, or higher head pressure, equipment needs to be selected for expected fluid concentrations, for proper operation. Reply. 09-03-2012, 11:01 AM #12.
Glycol vs Chilled Water - HVAC-Talk
WEBJul 1, 2009 · 1. Glycol systems, when used are typically restricted to those areas which could be subject to freezing due to outdoor temperatures (e.g. as used for a snow melting system). The chilled and hot water system piping in the project has been routed entirely indoors and is not subject to direct freezing from the outdoor air. 2.
Glycol chilled water loop question - HVAC-Talk
WEBJan 25, 2007 · Glycol chilled water loop question. We are going to use prop. glycol in our c/w loop for the first time this year. We have a 2100 gal system in a 5 story building. We installed an automatic glycol feed tank and introduced enough PG to make a 30% concentration. My question is that we seem to be losing pressure in …
Do you put glycol in chilled water loop? - HVAC-Talk
WEBFeb 25, 2008 · Here are a couple of things to keep in mind about glycol: 1. There will be a capacity correction, gpm goes up and chiller capacity goes down. 2. You need to be aware of the corrosive nature of the different types of glycol and the …
Propylene or ethylene glycol? - HVAC-Talk
WEBNov 30, 2010 · I am looking for pros and cons of using propylene or ethylene glycol in small chilled water systems that may be exposed to freezing conditions during cold weather. My background is design so I am aware of the physical properties of each product, I am looking for input more on the practical (cost, hard to get, etc.) side of things. Thanks in ...
Using PVC in a chilled water system - Page 2 - HVAC-Talk
WEBJul 4, 2008 · PVC sch 80 is the most common pipe for chilled water down here. PVC will expand and contract with temperature more than black iron will. We are year round cooling so no need for antifreeze unless you needed to run a chiller really cold to compensate for undersizing or for a process. So no real problems here with glycol reacting with the PVC.
Using PVC in a chilled water system - HVAC-Talk
WEBJul 1, 2008 · PVC for chilled water works great, but as noted earlier strapping and hanging is critical. Another contractor installed a system and it broke open over a weekend and flooded the office, the only good thing is it was the buiulding & land developement offices on the second floor of a 12 story building that were wiped out.
High system fill pressure for chilled water system - HVAC-Talk
WEBAug 31, 2004 · Have a industrial chilled water/prop glycol 25% mix system with about 20' of vertical height and 70' of horizontal piping, fittings etc. Customer is running system around 40psi fill pressure. I say its overkill for this application. Using the 1psi=2.31ft of pressure 12 psi should be more than enough to run the system.
Do you put glycol in chilled water loop? - Page 2 - HVAC-Talk
WEBMar 2, 2008 · Glycol requires a "tighter" system. Also depending on the layout of your system and the size of it you may just want to drain the water out during the off months of the chiller. "For example if you do have a/multiple AHU (s) with OA intake then maybe you can isolate and just drain those coils, but if you just drain it you need to make sure you ...
Effects of glycol on water treatment - HVAC-Talk
WEBJul 20, 2013 · If propylene glycol is introduced into a chilled water system, what effect will it have on system performance? Large (7000+ ton) plant serving hospital, suddenly I have elevated evaporator approaches and a reduction in heat transfer at AHU coils. Only difference is a moderate amount of glycol accidentally dumped into the CHW system.