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...
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...
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...
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...
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...
