Rancang Bangun Bed Storage untuk Thermal Energy Storage Berbasis Parafin dan Serbuk Besi

Abstract

Thermal Energy Storage (TES) is used as a heat storage medium for concentrated solar power systems, solar heaters and thermal management systems in light vehicles. The challenge with the TES application is that the design of the bed storage used must fulfill the basic function, namely the heat transfer process when charging and discharging and being able to store heat with minimal heat loss. In this research, bed storage for TES is designed to fulfill its function as a heat storage medium for low temperature applications, namely 50–100°C. The storage material used is a mixture of paraffin and iron powder with a mass ratio of 90:10. Determination of function using the Pahl and Beitz design method, provides the option of using a coil tube with copper material as a heat transfer medium and bed storage with a polyacetal thermoplastic polymer material. The test results of the prototype bed storage charging process show a heat transfer efficiency of up to 26.85% with an overall heat transfer coefficient of 21.422 W/m2.°C. The discharging process shows effective performance, optimal heat transfer characteristics based on the high heat transfer coefficient. The use of polyacetal material and the low thermal conductivity value of 0.231 W/mK causes a very slow heat loss rate of only 2.924 W. The prototype made is able to maximize the heat transfer process on the side of the bed storage material for charging and discharging functions and is able to reduce the rate of heat loss in storing function.