Author name / JHMTR 00 (2013) 000–000 99 99 1. Introduction Industrial halls with large and sometimes huge spaces use the large amounts of annual energy. The reason behind this large energy demand is mainly due to external walls, lack of insulation and high rate of air infiltration in such buildings. In the past decade, many different efforts have been performed in order to decrease the annual energy consumption (AEC) for various buildings. These efforts are almost under two categories as follow:  Improvement the buildings materials and their constructions.  Partially or fully replacement of the renewable energies in residential and commercial buildings. Among the renewable energies, solar energy is a more applicable energy which has different applications from space heating and domestic hot water production to electricity production. Therefore, there are many different studies on the solar energy and its applications. It seems that the air solar heater (A.S.H) as a new application for solar energy is investigated less than the other applications. A.S.Hs have different designs. A simple one is a flat collector which is installed on the building walls vertically or on the roofs with specific slope with respect to earth direction. A.S.Hs almost apply for space heating of residential and non-residential buildings. Among the pervious published researches, some of them are worth mentioning. A comparative performance study of some thermal storage materials used for solar space heating is performed by Khalifa and Abbas [1], numerically. They demonstrated that a storage wall 0.08-m- thick made from the hydrated salt CaCl 2 .6H 2 O maintained the zone temperature close to the comfort temperature with the least room Click here, type the title of your paper, Capitalize first letter of each words First Author a , Second Author b,* a First affiliation, Address, City and Postcode, Country b Second affiliation, Address, City and Postcode, Country Journal of Solar Energy Research 23 (2017) 99-104 Thermal energy saving in industrial halls using vertical air solar heaters Rahim Hassanzadeh a,* , Mohsen Darvishyadegari b a Department of Mechanical and Engineering, Urmia Univercity of Technology, Urmia 57166-17165, Iran b Department of Mechanical and Engineering, Urmia Univercity of Technology, Urmia 57166-17165, Iran Journal of Solar Energy Research (JSER) Journal homepage: www.jser.ut.ac.ir A B S T R A C T In this paper, an analysis on the thermal energy saving in large industrial halls is performed using air solar heaters. Computations are carried out for latitudes in the range of 35 ◦ ≤ Lat. ≤40 ◦ at the fixed Longitude of 45 ◦ . A large industrial hall with dimensions of length=100 m, width=30 m, and 4 m ≤ height ≤ 6 m is considered to study. In addition, on the south wall of the hall 25 flat air solar heater with dimensions of length=2 m and height=3m are considered. Several results are obtained in this study. For example, thermal energy audit of the building revealed that the industrial hall located at the latitude of 40 ◦ has more energy demand compared with the smaller latitudes. On the other hand, it is demonstrated that application of air solar heaters for such building saves the thermal energy consumption significantly depending on the latitude value. © 2017 Published by University of Tehran Press. All rights reserved. ARTICLE INFO Received: 28 Aug 2017 Received in revised form: 12 Sept 2017 Accepted: 24 Sept 2017 Available online: 5 Oct 2017 Keywords: Air solar heater; Energy saving; Solar radiation; Energy audit