Praveen Sirimanne

The world's population is growing, and so is the demand for energy. One of the most significant consumers of energy worldwide is the need for indoor climate control, especially air conditioning. The vast amount of electricity used for air conditioning releases a significant amount of carbon emissions and other greenhouse gases, which is harmful to the environment. But what is thermal comfort, and how does it relate to human psychology? The American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) defines thermal comfort as a sense of mind that depends on person to person. It is a subjective experience that is affected by various microclimatic factors, such as dry bulb temperature and humidity. However, it has been found that psychological factors also play a crucial role in determining an individual's satisfaction with their thermal environment. To gain insight into the psychological aspects of thermal comfort in outdoor spaces, researchers Marialen...

Introduction CoolPack simulation software can be used to solve simple to complex refrigeration cycles for academic, research, and technical purposes. Due to its minimal hardware requirement, CoolPack is able to provide results for the problems within a fraction of a second.  Important ! High school students and undergraduates are highly advised to carry out manual calculations to solve the problems. Most of the simulation programs found on the internet are somewhat erroneous, and someone with less experience is very unlikely to determine such flaws.  Example 01 - Single stage flooded system A 75 kW flooded chiller using R134a refrigerant operates between saturation temperatures of -15 °C in the evaporator and  35 °C in the condenser, with 2 °C subcooling. Assuming negligible piping losses and 80% compressor efficiency, estimate compressor input power at full load for single stage system. 1. Firstly, a schematic diagram like follows may be drawn to make visualization easy....

1    Introduction to CoolPack Coolpack is a piece of software developed as a result of a research project, and is used by refrigeration engineers, technicians, students, etc. for energy optimization of refrigeration systems and to determine and compare the characteristics of different refrigerants available on the market. Unlike most of the other complex software with advanced graphical interfaces, CoolPack has a very simple, but much faster interface, which helps the users to carry out simple refrigeration system calculations with a minimum hardware requirement. The basic functionality of Coolpack can be described as follows. Calculation and comparison of the characteristics of different refrigerants. Property plots Thermodynamic and thermo-physical data Refrigerant properties Cycle analysis of single and multi-stage refrigeration cycles. Calculation and estimation of component sizes and power requirements for proposed refrigeration systems. Simulations to determine the pro...