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Environol antifreeze has been suggested for our geothermal application and I was interested to see if anyone has any experience with this or a similar product. It is an ethanol mixture that that is advertised as an environmentally friendly alternative to the standard glycol solutions. The...

The engineer has indicated that he is planning to use the subduct method, and my concerns about moisture in a standard gypsum shaft remain outstanding. In reviewing the application, I missed the smoke damper component and I appreciate you bringing it to my attention. Since it is residential...

Thanks for the replies. My concerns seem to be echoed and I'm going to continue to pressure the design team to ensure that the system is designed for the long term operation. Regarding the airflow rates, I absolutely agree that they are low. The shower rooms are single stall spaces with a...

I am working on a dormitory project where the mechanical system design has changed at the last minute causing the engineer to make changes to the exhaust system that were not originally planned. In this project, the engineer eliminated the metal bathroom exhaust ducts in lieu of a 2-hr rated...

Thank you all for your assistance. There seems to be quite a bit of agreement on restricting the use of corridors to supply the OA to the suite. As a note of clarification, after I read my original post I realized that I did not mention that there are 10 "Suites" per floor that are connected...

I am looking for some guidance on a disagreement that I am having with another engineer regarding the design of a ventilation system for a new residence hall. The residence hall is subject to both the IMC and ASHRAE 62-2004 ventilation requirements. The building is designed with a suite...

You're right, I was surprised by the code reference as well. It was a state project that likely had a long history. Design likely started many years ago. As for the client, I'm not really sure that they know what they want.

Thank you for the information. I had presumed that this would be the case. Without getting into the purely legal aspects, it would seem to me that designing to 90A would be included in current "best practices". And while not "required" it may be prudent. Regarding the code reference, the...

I have a general question regarding the application of NFPA 90A. In a peer review, I noted that smoke dampers are required on an AHU systems that are greater than 15,000 cfm and serve 3-4 floors. The engineer responded by indicating that NFPA is not a code and only a standard, therefore he was...

Thanks for the reply. I guess the pressure drop issue is my whole misunderstanding with this issue. The distict system feeds multiple secondary systems off the same primary loop. The balancing valve location is effectively adding a pressure drop in the return leg. With the balancing valve in...

I am investigating a low hot water flow issue for a single building served by a district heating plant. The pumping system is designed as a constant speed primary distribution with varible speed pumps serving the building loads. A three way mixing valve maintains the building loop temperature...