Closed-cycle cooling system at the UPM Cryogenic Facility, Saudi Arabia

A description is given of the recently completed Cryogenic Facility at the University of Petroleum and Minerals, Saudi Arabia. Because the locally available tap water is warm and quite hard, giving rise to corrosion problems, the nitrogen and helium liquefiers feature a closed-cycle water chilling system. The paper discusses the system from the point of view of the liquefier heat outputs, required water flow rates, and the matching of the liquefiers to the chilling system.