How does ASHRAE 90.1 2001 impact HVAC systems?
Text excerpts from the above ASHRAE Energy Standards for Buildings, except Low Rise Residential Buildings (See enclosed scans of relevant pages): Purpose of Standard: • To provide minimum requirements for energy-efficient design of buildings 6.2.5.3 System Balancing • All HVAC systems shall be balanced • Written balancing report provided to owner for conditioned areas exceeding 5,000ft^2 (500m^2) • Hydronic Systems shall be Proportionately Balanced in a manner to first minimize throttling losses, then the pump impeller shall be trimmed or [max] speed adjusted to meet design flow conditions Exceptions: • Need not trim impeller or adjust speed if: • Pumps equipped with motors 10 hp (7.5 kW) or less • When throttling results are not > 5% of nameplate power draw, or 3 hp (2.2 kW), whichever is greater, above power required with trimmed impeller. 6.3.1 Economizers • Each Cooling system having a fan shall include either an air or water economizer 6.3.4 Hydronic System Design and Control • HV
