Last month, I opened a discussion on how I have enjoyed integrated project delivery (IPD) and design-build (D-B) projects over the years and how I have been fortunate to learn from other team members as I shaped my “full team participation” (FTP) process.

Over the years of designing and building HVAC infrastructure, I’ve been fortunate to be able to complete the projects via integrated project delivery (IPD) and design-build (D-B), in addition to design-bid-build (DBB) and construction management (CM).

Hydraulic modeling is seldom used in the day-to-day design of closed-loop or open-loop heating and cooling systems.

Years after an HVAC engineer starts to design closed-loop water systems and then progressively moves up the ladder of engineering success, he can forget and/or overlook many of the issues, concerns, details, opportunities, etc. associated with engineering these systems.

With last month’s publication, Engineered Systems magazine and I completed the 25th year of publishing this column.

How often does an existing open condenser water system, or some other type of open water system, get reused as part of a building renovation project and/or mechanical system upgrade

How often does an existing closed loop hot water heating or chilled water cooling system get reused as part of a building renovation project, and/or used to expand the area served by the system coverage to provide additional heating or air conditioning?

This month, the focus is on high-performance health care, and so it got me thinking about IAQ and infection control (IC) within hospi-tals.

This past August, I wrote in this column about the opportunity to invest in a niche business providing temporary HVAC design and construction administration.

How often has an AHU or system been reused as part of a building renovation project and/or to expand the area served by the associated unit to provide additional air conditioning or heating?