When talk first surfaced a number of years ago about using R-744 (CO2) in commercial refrigeration, there were two challenges — making the refrigerant work as a stand-alone in transcritical applications as well as in cascade systems and developing the components to make such approaches possible. Where does the refrigerant stand currently?
A joint conference focused on refrigerants and hosted by ASHRAE and the National Institute of Standards and Technology (NIST) has been announced for October 2012.
Mueller Streamline Co. has been working with Underwriters Laboratories (UL) to conduct a series of performance tests regarding its copper tube and fittings and some of the newer higher pressure refrigerants. As a result, the company’s Streamline® copper tube and fittings are UL recognized to 700-psi operating pressures.
Vehicle thermal management software aids in a/c system design and predicting performance. It allows engineers to access the required tools and libraries to build simulation models, run simulations, and display results graphically.