A two-phase fluid loop is one kind of thermal control systems for a satellite. This loop has an advantage in large amount of heat transportation. The accumulator is one of control elements for two-phase fluid loop. The accumulator controls the pressure in the loop by charged or discharged working fluid. A thermal accumulator is driven by heating or cooling of accumulator body. Amount of discharge liquid flow from accumulator was measured with an accumulator test bed. This test bet consists of a test accumulator and a tank that is a substitute for the two-phase fluid loop. Discharge flow rate was varied by heating or cooling position and by a wick in the accumulator. The performance of the accumulator was estimated from input energy and work for output.

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