AACHEN, Germany, November 21, 2012 – Natural substances such as CO2 (R744) have become increasingly important in refrigeration in order to decrease the greenhouse effect. Emerson Climate Technologies is presenting products and integrated solutions for medium and low temperature refrigeration to meet the needs of CO2 applications.
One of those products is the Copeland™ ‘Stream’ series. This range of semi-hermetic compressors designed for medium temperature R744 transcritical applications complements the recently launched Stream range for HFC refrigerants. As the most efficient compressor in its class, it reduces indirect emissions. Integrating this new development, Emerson Climate Technologies offers three 4-cylinder models with refrigerating capacities between 20 kW and 38 kW*. Stream CO2 compressors are characterized by a design pressure of 135 bar. Refrigerant flow and heat transfer have been optimized for best performance. All compressor models of the Stream family are released for operation with frequency inverters and feature CoreSense™ Diagnostics, compressor-based electronics that provides advanced compressor protection and diagnostics for improved system reliability, reduced service costs and increased equipment uptime. With CoreSense technology service engineers can diagnose system-related problems faster or even before they occur in order to keep refrigeration systems in optimum condition over their entire lifetime. The diagnostics module stores compressor asset and runtime information and offers the possibility to monitor individual compressor power.
The CO2 technology provides solutions for low temperature applications. The market has already adopted the Copeland Scroll™ compressors from the ZO series. ZO scrolls are specially designed to meet the high pressure and severe lubrication requirements encountered in subcritical CO2 applications. The range covers refrigeration capacities from 7 to 23 kW** with five standard models ranging from ZO34K3E to ZO104KCE and one Copeland Scroll Digital™ model ZOD104KCE. They are the ideal solution for medium temperature cascade and booster systems, particularly when combined with Copeland Stream for CO2 transcritical.
The refrigeration circuit is rounded off by the Alco Controls CX electronic high pressure expansion valves and oil management devices from Emerson Climate Technologies. CX for liquid injection duty and hot gas bypass are stepper motor driven valves for precise control of CO2 refrigerant mass flow. They are available in four sizes (CX4 to CX7) and can be used with Emerson’s EXD-U00 driver to control the high pressure in a CO2 gas cooler for example. These valves are characterized by a factory test pressure of 171 bar and a maximum operating pressure of 120 bar. Thanks to its positive shut-off capability, the CX valve allows to eliminate the use of a solenoid valve.
Emerson Climate Technologies has upgraded the pressure rating of its TraxOil OM4 oil management system for CO2 subcritical applications. The new maximum working pressure of the OM4 product line is 60 bar, an increase of more than 30%. This working pressure fulfills market requirements with respect to stand still pressure conditions especially in CO2 subcritical applications.
With its extensive product range, Emerson Climate Technologies supports the food retail sector in meeting its environmental objectives. Each store operator therefore has the option of cooling their fresh products the natural way.
* Evaporating -10°C, gas cooler exit: 35°C/90bar, suction superheat 10K subcooling 0K
**LT EN12900: -35°C/-5°C 10K SH
Emerson (NYSE: EMR), based in St. Louis, is a global leader in bringing technology and engineering together to provide innovative solutions to customers through its network power, process management, industrial automation, climate technologies, and appliance and tools businesses. Sales in fiscal year 2011 were US$ 24.2 billion. For more information, visit www.Emerson.com
About Emerson Climate Technologies
Emerson Climate Technologies, a business of Emerson, is the world’s leading provider of heating, ventilation, air conditioning and refrigeration solutions for residential, industrial and commercial applications. The group combines best-in-class technology with proven engineering, design, distribution, educational and monitoring services to provide customized, integrated climate control solutions for customers worldwide. Emerson Climate Technologies’ innovative solutions, which include industry-leading brands such as Copeland Scroll™ and Alco Controls, improve human comfort, safeguard food and protect the environment. For more information, visit www.emersonclimate.eu
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