A quick follow-up on my last blog post with a real life example that happened this week:
I am currently working on business occupancy office renovation project for one of our healthcare clients. My mechanical engineers are running load calculations for the required heating and air conditioning load. Two key pieces of information needed for this calculation are the U-factor and the solar heat gain coefficient (SHGC) of the glass installed in the existing windows. After reviewing all the existing drawings and reviewing the specifications, the glazing specification was found to be missing.
While on site doing some field verification for existing walls, I ran across extra glass panels stored in the shell space. I found a sticker tagged with the original order number and the glazing supplier from the original 2003 project.
When I returned to the office I called the supplier and within an hour they sent me the specified glazing for the window units. Finding the actual makeup of the glazing components allowed us to accurately calculate heat gain in the east, south, west and north exposures. Ultimately, this effects the number of VAV boxes, fans, thermostats and duct runs required for our project. By assuming an inaccurate number for the SHGC we could have under sized the mechanical system serving the spaces used on a daily basis by our clients. This would have meant hot, uncomfortable rooms for the client, and repairs totaling up to four times the cost of doing it right the first time.
This is a great example of the ways in which [smart design] works to deliver solutions and provide the most efficient service, right down to simple on-site investigation.