20th National Thermal Science and Technology Congress (ULIBTK), Balikesir, Turkey, September 2015

XII. National HVAC and Sanitary Congress and Exhibition (TESKON 2015), Tepekule Convention Center, İzmir, Turkey, April 2015

The purpose of this paper is to provide information on CHILLER SELECTOR software which is on chillers’ performance and energy efficiency calculation.  The software includes selection of optimum products, freecooling and evaporative cooling simulation as well.

Key Words: Energy Efficiency, Cooling, Evaporative Cooling, Adiabatic Cooling, Chiller, Chillers, Simulation, Software, Free Cooling, Chiller Selector

X. National HVAC and Sanitary Congress and Exhibition (TESKON 2011), Tepekule Convention Center, İzmir, Turkey, April 2011

R744 (CO2) was used in the early stages of the refrigeration industry, but it lost the competition with halocarbon refrigerants because of its high operating pressure and the loss of capacity and coefficient of performance when rejecting heat near or above the critical point. Because the negative effect of halocarbon refrigerants on environment, that R744 (CO2) started to used recently. New heat exchanger technology and system components allow R744 (CO2) to reach competitive efficiency levels for transcritic cycle especially in northern countries and for sub-critic cascade cycle in southern countries.

Recently, CO2 has been increasingly studied for application as the primary refrigerant in transcritical mobile air conditioners, vending machines, supermarkets, cold rooms, food production and process industry, industrial ice cream machineries and heat pumps.

This article is prepared to give general technical information on R744 (CO2) cooling systems, CO2 evaporators and gas coolers.

Keywords : CO₂, R744, Transcritic CO₂ Cycle, Subcritic CO₂ Cycle, Gas Cooler, Natural Refrigerant

Refrigeration World Magazine, No. 5, December 2009

Increasing energy efficiency is one of the most important points in our era. Becoming a matter of primary importance in air conditioning, industrial, commercial and process cooling applications, energy efficiency affects designs of the systems included dry coolers and water chillers. Besides, legislations and restrictions on energy efficiency also urge manufacturers to develop high performance, energy efficient, environment friendly, economic and long life products. In these purposes, the tendency towards alternative energy efficient systems, which use natural resources, is increasing. Free cooling is one of the natural resourced methods for energy efficiency.

This paper is intended to provide information on free cooling efficiency with a theoretically examination of A, C and E energy class dry coolers combined with the chillers in tandem work in air conditioning application.

I.Cooling Technologies Symposium, İzmir, Turkey, October 2008

Decreasing energy consumption and increasing efficiency is one of the most important points in our era. Becoming a matter of primary importance in air conditioning, industrial and commercial cooling applications, supermarket cooling, blast freezing and process cooling applications, energy efficiency affects design of chillers (and its equipment such as condensers, compressors etc.) and urges manufacturers to develop high performance, energy-efficient, environment friendly, economic, and long life products. This paper is intended to provide information on the factors that affects energy efficiency of finned air cooled condensers used on chillers.