Revitalizing Comfort: designing an Energy–Efficient HVAC System for the University Auditorium

Abdul Samad Khan; Muhammad Ehtesham ul Haque; Adeel Ahmed Khan; Syed Izhar ul haque; Syed Obaidullah; Muhammad Umer Khan

doi:10.36561/ING.26.2

Authors

Abdul Samad Khan NED University of Engineering and Technology, Pakistan https://orcid.org/0009-0005-5449-635X
Muhammad Ehtesham ul Haque NED University of Engineering and Technology, Pakistán https://orcid.org/0000-0001-8751-348X
Adeel Ahmed Khan NED University of Engineering and Technology, Pakistan https://orcid.org/0009-0004-6790-8176
Syed Izhar ul haque NED University of Engineering and Technology, Pakistán https://orcid.org/0009-0002-5693-5879
Syed Obaidullah NED University of Engineering and Technology, Pakistán https://orcid.org/0009-0000-0168-6196
Muhammad Umer Khan NED University of Engineering and Technology, Pakistán https://orcid.org/0009-0001-7173-6395

DOI:

https://doi.org/10.36561/ING.26.2

Keywords:

HVAC, Auditorium, Duct sizing, Cooling load, Piping

Abstract

Nowadays, thermal comfort is becoming a major problem for people due to increasing global warming and climatic changes, but it can be resolved by the concept of Heating, Ventilation, and Air Conditioning (HVAC) systems. The purpose of HVAC is to provide occupants with a comfort zone so that they can feel comfortable according to their thermal comfort. The core objective of this study is to design and propose an HVAC system as per actual design conditions for the University Auditorium located in Karachi, Pakistan. A direct Expansion (DX – Type) system is installed in the Auditorium that has exceeded the lifespan of twenty years, refrigerant R-22 which is currently being used has been obsolete due to its high GWP (Global Warming Potential) and ODP (Ozone Depletion Potential) values which are 1810 and 0.05 respectively. To achieve the objective of this study, two approaches are employed. Cooling Load Temperature Difference (CLTD) method & Hourly Analysis Program (HAP) software. The cooling load calculated from the CLTD method is 202 kW equivalent to 57.5 Ton of Refrigeration (TR). On the other side, the cooling load calculated from HAP software is 192.8 kW equivalent to 55 TR. By considering the calculated cooling load for the University Auditorium, two different HVAC systems are proposed, based on Water cooled and Air-cooled Vapor Compression Cycle. After this study, engineers will be able to design an HVAC system for any facility as per design conditions. Also, they can propose different cost-effective and energy-efficient HVAC systems for that particular space.

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