Solar energy is one of the most well known green sources of energy in the world. It has many applications such as water heating, space cooling, solar drying and etc. This research presents a feasibility study of a small scale air conditioning unit consists of an aqua-ammonia ejector absorption system equipped by evacuated solar thermal collectors. Absorption system provides cooling during hot season and solar collector provides heating during the cold season directly. This refrigeration system consists of 2 pressure levels, a high pressure side in the condenser and the generator, and a low pressure side in the evaporator and the absorber. The idea of utilizing an ejector cycle is to reduce throttle losses. The high-pressure solution expands through the nozzle in the ejector and creates a vacuum at the other end of the ejector. As a vacuum occurs, the vapor from the evaporator is drawn into the ejector. The dynamic simulation has been performed using TRNSYS 16 environment. TRNSYS software is special software for energy system simulation. This software could be used in energy system simulation and specialized in the field of renewable energy. TRNSYS software is able to define a link to other software such as Fluent, MATLAB, Excel and etc for more complicated calculations and simulations. In this study, we modeled the absorption system in Excel, by implementing the derivative equation of binary working fluid (aqua and ammonia). Proper harvesting of solar energy will provide an invaluable thermal source of energy that could be investigated in different applications suchas Air-conditioning (space cooling), space heating, drying and etc. Solar energy can run the system but not continuously. That why we need an auxiliary source to assure the system will functions properly. This study presents the solar fraction for a small scale aqua-ammonia ejector Air conditioner from 10% to 35% when the solar collector area is 5~50m 2 . The economic analysis has also been conducted. Ele
