A MATHEMATICAL MODEL FOR SOLAR ASSISTED AUTOMOBILE A/C BASED ON ABSORPTION REFRIGERATION SYSTEM TALAL ABU MANSOUR 1 , SALAMEH SAWALHA 2 & NESREEN SALEM 3 1 Faculty of Engineering, Northern Border University, Arar Kingdom of Saudi Arabia 2 Faculty of Engineering, Northern Border University, Arar, Kingdom of Saudi Arabia On Leave from, Faculty of Engineering Technology, Al-Balqa Applied University, Jordan 3 Jordanbits Training Center, Amman, Jordan ABSTRACT Most conventional air-conditioning (AC) systems used in vehicle are driven by fossil fuel combustion, and therefore give raise emission of environmentally damaging pollutants. In addition, conventional cooling systems increase the load on the engine therefore increase the fuel consumption. In general vehicle is used, on average, about 249 hours annually or about 41 minutes per day, 365 days a year. Estimates of air-conditioning use range from 107 to 121 hours per year or 43% to 49% of vehicle usage. An air conditioner compressor can add up to 5-6 kW peak power draw on a vehicle’s engine. This power draw is equivalent to a vehicle driving steady state down the road at 35 mph (56 km/h). In this research a detailed thermodynamic analysis of water/lithium bromide absorption refrigeration cycle is performed, in specific operational conditions compatible with the nature of the weather in most areas of Saudi Arabia (30 ≤ Ta ≤ 50,5 ≤ Te ≤ 15, 80 ≤ Tg ≤ 120 ), and under cooling load compatible for large size vehicle(5 kW), and a mathematical model of solar assisted automobile A/C based on absorption refrigeration system was been deduced. KEYWORDS: Air-Cooled Absorption System, Solar Radiation, Absorption, Water-Lithium Bromide, Vehicle Emission Gases, Saudi Arabia Transportation Road Sector INTRODUCTION The targets vary from country to country when talking about energy and its uses. Some countries suffer from scarcity and others do not exist at all, but all the countries involved in the issue of pollution caused by the burning of various fuels. Talk about the use of fossil energy in Saudi Arabia has its own meaning for several reasons, a simply applies the concept of burning very large quantities of oil for cooling, comparison with other countries for many different reasons, which will be reviewed later. The Kingdom of Saudi Arabia in the south-west of the continent of Asia, between latitudes 16 and 33 north and longitudes 34 and 56 east, and constitute the bulk of the Arabian Peninsula (80%) with an area of 2,149,690 km 2 , and a population of nearly 29 million, including residents of different countries, in addition to the millions of visitors annually from different corners of the earth for the purpose of Hajj and Umrah. Saudi Arabia has a stable political and economic depends on oil wealth (has the largest reserves in the world), which forms the backbone of exports (90%), making it occupy a very advanced position among world economies in terms of GDP. As a result of this situation the Kingdom witnessed a renaissance in construction, economic and rapidly reflected their results on the citizen in all walks of life and seemed effects are evident in the evolution of infrastructure, education, health and transport in recent years, for example but not limited to increased length of paved roads from 230 in 1955 to 52000 km in 2010 (21.5 % of total road) to cope with the increase in the percentage of ownership of individuals vehicles(individuals ownership vehicles Changed from one vehicle for every 48 persons in 1972 to the vehicle for 4 International Journal of Mechanical Engineering (IJME) ISSN 2319-2240 Vol. 2, Issue 4, Sep 2013, 75-86 © IASET