Plug loads refer to energy used by equipment that is plugged into an outlet. In an office, key plug loads include computer and monitors, printers, and copiers. Plug loads can average approximately 30% of electricity use in office settings, much of which can be attributed to parasitic loads.
A ventilation fan belt is a belt, driven by the crankshaft of an engine, that turns a fan for drawing cooling air through the radiator. Synchronous drive belts are designed to reduce both belt slippage and frictional losses. Cogged V-belts are designed to reduce the bending resistance as the belt travels around the sheave (pulley) and have less frictional losses than standard V-belts.
GSA's Green Proving Ground found that the use of cogged V-belts and synchronous-drive fan belts are a low-investment way to reduce the inefficiencies in ventilation fans caused by bel slippage and bending resistance. GPG found an energy savings of 2 - 20% for synchronous belts, with about half that savings for cogged fan belts. Payback is between 1 and 4 years, depending on the type of fan belt.
Contributes to meeting The Guiding Principles for High Performance and Sustainable Buildings
GSA's Green Proving Ground recommends replacing V-belts with synchronous drive belts on all variable air volume (VAV) fans. On constant volume (CV) fans, belts should be replaced at end-of-life with cogged V-belts.