Copyright © Ahmed Ullah et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. International Journal of Engineering & Technology, 9 (2) (2020) 284-298 International Journal of Engineering & Technology Website: www.sciencepubco.com/index.php/IJET Research paper Designing of advanced solar absorption chilling unit Ahmed Ullah 1 , Asim Mushtaq 2 *, Rizwan Ahmed Qamar 1 , Zaeem Uddin Ali 1 1 Chemical Engineering Department, NED University of Engineering & Technology, Karachi, Sindh, 2 Polymer and Petrochemical Engineering Department, NED University of Engineering & Technology, Karachi, Sindh, Pakistan *Corresponding author E-mail: engrasimmushtaq@yahoo.com Abstract In emerging nations, access to electricity is inconsistent is a widespread issue. This research aimed to design an absorption chiller based on utilising heat from a solar tracker system to power a chiller. For this purpose, a solar-driven ammonia absorption chilling system is designed. The solar-powered absorption chiller is a chilling system designed to offer refrigeration to developing areas. It is an intermittent system in which ammonia and water are used as absorbent and refrigerant respectively. A small-capacity vapor ab-sorption system was first simulated and its parameters were compared with the calculated ones. The main constituents like condenser, evaporator and generator are designed based on capacity. The basic heat and mass transfer equations relating the working properties are specified. The coefficient of performance (COP) obtained from experiments is in the range of 0.3-0.4. Keywords: Ammonia; Chilling Unit; Condenser; Evaporator; Solar Absorption. 1. Introduction Refrigeration has become a fundamental part of our living life. Almost everybody has a refrigerator, although few know about the procedure requisite to deliver the drop in temperature, known as refrigeration. Nature works a lot of like a warmth motor, heat streams from high- temperature modules to low temperature modules have appeared in Figure 1. Refrigeration is a method to keep a cool component cool or to decrease the temperature of one part beneath that of the other. This technique is, basically at that point, an invert heat motor; where heat is taken from a cool component to be moved to a hotter component by adding work to the framework. In a heat engine, work was completed to do the reverse; effort must be done to the framework. This input effort is customarily mechanical work, similarly be focused by mag- netism, acoustics, lasers and various methods [1], [2]. In the United States, it is easy to take amenities like refrigeration for granted. However, developing countries cannot use traditional refrigeration because it requires electricity, which is unreliable or non-existent in most areas of the developing world. Disease, malnutrition, and economic struggle are just some of the debilitating trends that could be reversed if access to reliable and affordable refrigeration were an option. In the country of Pakistan, a developing nation, most of the labor force works in agriculture. Access to water is plentiful due to geographical location, but electricity is only available to 14.8% of the population (EIA). Therefore, average farmers cannot use electric refrigeration to store their perishable goods. Speaking to Thermogen (an NGO based in Pakistan), the primary motivator for access to refrigeration is to reduce dairy spoilage. Currently, only milk produced in the morning can be taken to markets and the Food and Agriculture Organization estimates that about 27% of all milk produced in Pakistan is lost due to spoilage, spillage, or waste. The value of these losses is US$23 million a year (FAO) [3], [4]. Fig. 1: Schematic Diagram of Heat Engine Thermodynamic. In addition to the economic incentives, lack of refrigeration is a contributing factor to malnutrition and foodborne illness [33.9% of children in Pakistan, under the age of 5, are severely underweight (CIA)]. Conventional refrigeration is not a feasible solution due to lack of elec- tricity; however, the implementation of a solar-powered refrigeration system can provide much-needed refrigeration to rural communities that currently lack such modern conveniences [4], [5]. The benefits of an absorption chiller refrigerator powered by concentrated solar power (CSP) are many. First, concentrated solar power, on a residential scale, presents many opportunities for the use of heat. Although this project focuses on the application of CSP for absorption refrigeration, the heat from this could also be used for water desalination, electricity production, and heat for cooking or sterilisation. Second, the absorption chiller refrigerator itself has fewer moving parts, making it an ideal choice for an area with limited access to the