Abstract
This chapter analyzes pressure drop characteristic of the cooling system for the HTS power cable through experiment. Liquid nitrogen is circulated by a pump and cooled back by cooling system. Typical operating temperature range is expected to be between 65K and 77K. A subcooler heat exchanger uses saturated liquid nitrogen as a coolant to cool the circulating liquid nitrogen stream that cools the HTS power cable. The HTS power cable needs sufficient cooling to overcome its low temperature heat load. To achieve successful cooling, it is required to investigate the hydraulic characteristics to design the cables. Especially, the pressure drop in the cable is an important design parameter, because the pressure drop decides the length of the cable, capacity of the coolant circulation pump, and circulation pressure, etc. The pressure drop through the flowmeters is proportional to the square of the mass flow rate. To reduce the total pressure drop of the cooling system, the flow rate of liquid nitrogen must be controlled by rotational speed of the circulation pump as the flow control valve opens over 45%.
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