Terms listed in this glossary are identified in context throughout the courses within this site. You can identify glossary terms links by this icon: 
Make-up water – water supplied to a cooling tower to replenish the water lost through its evaporative cooling process
Minimum Efficiency Reporting Value – Commonly referred to as the MERV Rating is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) to rate the effectiveness of air filters.
Monitor — A window whose sill is above the roof line, which faces two or more directions.
NASA — National Aeronautics and Space Administration
One Pass Water Systems/Single Pass Cooling System – an open loop method of cooling in which water passes over a product or piece of equipment and then enters the environment
Operations & Maintenance — Abbreviated as O&M
Owner's Project Requirements (OPR) — Equipment, system and facility criteria necessary to meet the owner's needs for the planned facility. Also called Operational Performance Requirements, Owner's Design Intent.
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