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Simulation for Energy Savings in AC Systems Equipped with Shaded Condensing Units

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2019 ASEE Annual Conference & Exposition


Tampa, Florida

Publication Date

June 15, 2019

Start Date

June 15, 2019

End Date

June 19, 2019

Conference Session

ECCD Technical Session

Tagged Division

Energy Conversion and Conservation

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Paper Authors


Maher Shehadi Purdue Polytechnic Institute

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Dr. Shehadi is an Assistant Professor of Mechanical Engineering Technology (MET) at Purdue University. His academic experiences have focused on learning and discovery in areas related to HVAC, indoor air quality, human thermal comfort, and energy conservation. While working with industry, he oversaw maintenance and management programs for various facilities including industrial plants, high rise residential and commercial buildings, energy audits and condition surveys for various mechanical and electrical and systems. He has conducted several projects to reduce carbon dioxide and other building emission impacts by evaluating and improving the energy practices through the integration of sustainable systems with existing systems. His current research focuses on engaging and educating students in sustainable and green buildings' design and energy conservation. He is currently investigating various ways to reduce energy consumption in office buildings.

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Part of University Name Removed Mechanical Engineering Technology (MET) program is to educate MET students on energy conservation in general and for buildings in specific. In this study, which was part of a project conducted for HVAC & Refrigeration class (course code removed), the team decided to investigate ways to reduce energy or improve the coefficient of performance (COP) and efficiency of refrigeration cycles by looking into energy consumption in the condenser unit of the system. Sometimes overlooked and underappreciated, a power plant condenser can make or break the efficiency and power delivery goals. Understanding how important a role the condenser plays is a good step toward greater energy conservation awareness. The team conducted a parametric study to analytically investigate improvements in the COP of a refrigeration cycle when its condenser is shaded from the solar flux. Energy balance and heat transfer equations for heat exchangers were used to determine the shaded and unshaded condenser temperatures while keeping the split temperature difference constant. The simulation investigated improvement in COP for multiple chiller units having various cooling loads varying from 286-1300 kW. Multiple cases and scenarios were investigated keeping the evaporator temperature fixed while varying the outdoor temperature and vice versa. A base case with 5°C evaporator temperature and 35°C for the ambient air temperature was used. The improvement in the COP for the base case with shaded condenser ranged between 10-15% for various cooling loads. As the ambient air temperature or the evaporator temperature were increased, the improvement in the COP decreased with more reductions seen at the lower cooling load ranges.

Shehadi, M. (2019, June), Simulation for Energy Savings in AC Systems Equipped with Shaded Condensing Units Paper presented at 2019 ASEE Annual Conference & Exposition , Tampa, Florida. 10.18260/1-2--33266

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