Research Article European Journal of Technique (EJT) Vol 9, Number 1, 2019 Copyright © INESEG ISSN 2536-5010 | e-ISSN 2536-5134 http://dergipark.gov.tr/ejt EJT ASSESSMENT OF ENERGY PERFORMANCE BASED ON ENERGY AUDIT OF A HOTEL USING EXERGY APPROACH Mehmet Emin Ugur OZ 1* , M. Ziya SOGUT 2 This study presents an analytic assessment method of energy consumption processes that was developed to apply to the energy management systems of hotels. This method has based directly on an exergetic approach and examined energy and environmental performances using energy and exergy analysis with the pre-energy audit. The energy efficiency performance of the hotel was considered for uninsulated (Case I) and insulated (Case II) conditions. The results of the analysis show that energy consumption losses are related to not only the structural features of the buildings but also the operational management of the hotels. Also, the specific energy consumption of Case II is 43,08% higher than the Case I. Exergetic efficiency for insulated and uninsulated conditions were found as 27.31% and16.26%, respectively. At the end of the study, some recommendations on effective energy management and the applications of a hotel were revealed. Key words: Hotels, Energy Management, Energy Audit, Energy Analysis, Exergy Analysis. 1. Introduction Increases in the energy consumption based on fossil energy resources, which is the primary reason for the environmental impact, has been motivated all sectors for investigation energy-efficient applications. According to researches of the European Union (EU), the building sector has approximately 40% of the total energy consumption and 36% of the CO2 emissions. Hotels, which are known as having high energy consumption and large complex buildings among the commercial buildings, have 6% roundly of the total energy consumption of the building sector. Hotels, as commercial enterprises, directly depends on tourism mobility and the capacity of the sector, which served 980 million people in 2011, is expected to will increase to 55% in 2020 to serve more than 1.5 billion people [1]. A study about 610 hotels across Europe with including 40 hotels in Ankara Turkey, revealed that the amount of energy used by most hotels is between 200-400 kWh/m 2 .yr. This important potential for consumption, which is dependent on the occupancy rates of hotels, has contributed significantly to the emission production [2]. Therefore, the determination of energy efficiency and savings potential is the critical point for reducing energy waste and CO2 emissions. In the literature, many studies related energy efficiency and savings based on the building sector like commercial, high- volume buildings and hotels have found [3,4]. Energy analysis considering hotels is defined as a 1 M.Emin Ugur OZ Vocational Schools of Tech. Sci., Energy Depart., Uludag Univ., Bursa, Turkey (meuguroz@uludag.edu.tr) https://orcid.org/0000-0002-2306-6008 2 M.Ziya Sogut, Maritime Faculty, Piri Reis University, Tuzla/Istanbul, Turkey, (mzsogut@gmail.com) https://orcid.org/0000- 0002-2306-6008 Received: 20 December 2018; Accepted: 10 June 2019 Doi: https://doi.org/10.36222/ejt.500241 52