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

Abstract

In order to meet the operation requirements of the 42 Tesla(T) resistive magnet which will be built by Chinese High Magnetic Field Laboratory(CHMFL) in 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 paper will make a detailed analysis about the system upgrading and transformation plan. In terms of the refrigeration, in order 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 the refrigeration. With the increase of 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 flow rate of the 42 T resistive magnet is expected to exceed 1200 m3/h, the purification flow rate of the de-ionized water also need 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.