![]() Different practices of HVAC system maintenance can result in substantial differences in building energy use. Many researches have been done to look at design efficiencies and operational controls for improving energy performance of buildings, but very few study the impacts of HVAC systems maintenance. Among various driving factors to energy performance of building, operations and maintenance play a significant role. buildings is consumed by heating, ventilation and air conditionings (HVAC) according to EIA statistics. « lessĪlmost half of the total energy used in the U.S. Further evaluations of duct leakage impacts should be carried out in the future after methodologies are developed to deal with duct surface heat transfer effects, to deal with airflows entering VAV boxes from ceiling return plenums (e.g., to model parallel fan-powered VAV boxes), and to deal with static pressure reset and supply air temperature reset strategies. The VAV system that we simulated had perfectly insulated ducts, and maintained constant static pressure in the ducts upstream of the VAV boxes and a constant supply air temperature at the airhandler. ![]() This suggests that duct sealing should be considered at least for VAV systems with 10% or more total duct leakage. Even with total leakage rates as low as 10%, duct sealing is still cost effective. Using a suggested one-time duct sealing cost of $$0.20 per square foot of duct surface area, these results indicate that sealing leaky ducts in VAV systems has a simple payback period of about 1.3 years. (United States) Additional Journal Information: Journal Volume: 92:2B Conference: ASHRAE annual meeting, Portland, OR, USA, Country of Publication: United States Language: English Subject: 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE OFFICE BUILDINGS SPACE HVAC SYSTEMS COMPUTERIZED SIMULATION D CODES AIR CONDITIONERS AIR CONDITIONING AIR FLOW AIR QUALITY BLOWERS CONTROL THEORY COST ENERGY CONSERVATION MEDIUM TEMPERATURE NEW JERSEY POWER DEMAND SPACE HEATING TEMPERATURE CONTROL THERMAL COMFORT BUILDINGS COMPUTER CODES CONTROL ENERGY SYSTEMS ENVIRONMENTAL QUALITY FEDERAL REGION II FLUID FLOW GAS FLOW HEATING NORTH AMERICA SIMULATION USA 320106* - Energy Conservation, Consumption, & Utilization- Building Equipment- (1987-) 990220 - Computers, Computerized Models, & Computer Programs- =. Authors: Norford, L K Rabi, A Socolow, R H Publication Date: Wed Jan 01 00:00: Research Org.: Center for Energy and Environmental Studies, Princeton Univ., Princeton, NJ OSTI Identifier: 6767943 Report Number(s): CONF-8606125- Journal ID: CODEN: ASHTA Resource Type: Conference Journal Name: ASHRAE Trans.
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