Design of the Cooling Water System Upgrade for 42 T Resistive Magnet at the CHMFL

Abstract

To meet the operation requirements of the 42 T resistive magnet which will be built by the Chinese High Magnetic Field Laboratory (CHMFL) in the future, the cooling water system needs to be upgraded accordingly. The cooling water system will improve its performance based on the existing cooling system. This article will make a detailed analysis of the system upgrading and transformation plan. In terms of refrigeration, to meet the requirements of larger refrigeration temperature difference, a new centrifugal chiller with large temperature difference will be added in series with the existing unit of refrigeration. With the increase in heat load, the system will connect a new plate heat exchanger in parallel on the basis of the original heat exchange capacity. However, the circulating cooling water flowrate of the 42 T resistive magnet is expected to exceed 1200 m3/h, the purification flowrate of the deionized water also needs to be upgraded, and the purification ratio is expected to reach more than 6%. In addition, the control system will be also combined with the new equipment and pipelines to realize a variety of chilled water storage and supply modes to better meet the operation of the new-built magnet.