Do you mean expensive to operate, not purchase.
I would guess in the system in question it is a dual stage system, where one compressor cools the low stage and the other compressor is water cooled and the water cooler has an air cooled compressor. Who you purchase the unit from and who services it for you can be 2 completely different groups. We have chambers from Ransco, Thermotron and Russells. We use a local HVAC company that has a skilled ultra-low temp tech, as we have 2 dual stage systems(-65C). If it is a dual stage system, make sure the HVAC company has a guy that does the ultra-low, it is a different skill set and the untrained will cost you time and money figuring out how the system actually works. An environmental chamber is a fancy beer cooler/humidor/meat locker/sauna/steam room/warming oven. A water chiller still uses simple refrigeration/HVAC principles. Good luck, Doug From: [email protected] [mailto:[email protected]] On Behalf Of Fred Townsend Sent: Friday, December 05, 2008 4:01 PM To: Marko Radojicic Cc: [email protected] Subject: Re: Recommendations requested: Water chiller companies in N. California Many on your list are not Silicon Valley but they serve Silicon Valley. Caveat Emptor. Perhaps you are looking in the wrong places. There are several HVAC and electrical companies in the Valley that do that sort of work. The key words are HVAC not water chillier. They are as close as the Yellow Pages. I don't know what kind of testing you are doing but chilled water is not normally used because it limits the low end to about 4 degrees C. If you are talking about water cooled mechanical that can be attached to some existing HVAC systems. The choice of systems is highly dependent on volume and range. N2 and CO2 systems are widely used for shocking and are easy to setup. They are expensive relative to mechanical so they are not normally used for production. Fred Townsend DC to Light Marko Radojicic wrote: Hello Group, We are looking to buy a water-cooled environmental chamber which requires an external water chiller for maximum performance. None of our potential vendors offers a turn-key solution however. Does anyone have first-hand recommendations with a chiller company that services Silicon Valley? The following link lists 25 companies which is 22 too many for me to follow up with. I’d really like to narrow the list down first. We are looking for, what else, high quality and low cost. http://www.thomasnet.com/northern-california/chillers-13936489-1.html Thanks, Marko Marko Radojicic Manager, Qualifications and Regulatory StrataLight Communications, Inc. 151 Albright Way Los Gatos, CA 95032 [email protected] Desk: 408.385.3033 Cell: 650.575.3865 CONFIDENTIALITY This e-mail message and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail message, you are hereby notified that any dissemination, distribution or copying of this e-mail message, and any attachments thereto, is strictly prohibited. If you have received this e-mail message in error, please immediately notify the sender and permanently delete the original and any copies of this email and any prints thereof. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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