PCM considered in this study is lithium hydride. The heat transport fluid is assumed to be lithium. The goal of this optimization is to minimize the weight and volume of the TES for a given operation condition. The results include the optimal particle diameter and geometry for the storage tank. (Paper number IAF-ICOSP89-3-1.) 3-4. Heat Transfer on Latent Thermal Energy Storage for Space Solar Dynamic Receiver Kotaro Tanaka, Yoshiyuki Abe, Katsuhiko Kanari, Osami Nomura & Masayuki Kamimoto Energy Materials Section, Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305, Japan. Latent thermal storage is being considered for space solar power applications because of its ability to supply thermal energy to the power generator at constant temperature throughout the orbit and low system mass and volume. This paper will describe latent thermal storage systems incorporated with the space solar dynamic receivers. Experimental and analytical study associated with the phase change process is conducted and a new method which reduces the stress of the canister and enhances the heat transfer is introduced. In this method, the inside of the thermal storage canister is separated by graphite fins which are not wetted by the PCM. Further, consideration on advanced concepts for high temperature energy storage will be discussed. Our particular interest is encapsulating the PCM within the submicron sized porous structure. Significant weight reduction can be achieved by introducing ceramic-PCM composite systems. Systematic screening of latent thermal storage materials for space use has been conducted and several candidate materials have been selected. Most of the selected materials are fluoride salts. Fluoride salts have a high melting temperature and high heat of fusion. However, their low inherent thermal conductivity and large volume change upon melting must be addressed. A principal object in the study is to examine the phase change behaviour of containerized materials. We have performed a detailed thermal and stress analysis on solidification and melting heat transfer process with void formation within the canister. Two experimental studies are now under way. The one is in situ visualization of the void formation and direct measuring the volume change using X-ray Computerized Tomography. The other is the cycling performance tests of thermal storage canisters conducted in the He-Xe gas circulating loop. (Paper number IAF-ICOSP89-3-4.) 3-7. High Temperature Superconducting Technology for Advanced Space Power Systems Ira T. Myers & Karl A. Faymon Power Technology Division, NASA-Lewis Research Center, Cleveland, OH 44135, USA. In the 1960s and again in 1978 NASA sponsored major efforts to assess the then relatively new field of superconductivity for a wide range of space applications. These and other ensuing studies indicated that this technology has potential for significant benefits when applied to space power systems and their components. The advent of High Temperature SuperConductivity (HTSC) makes this technology even more attractive for a wide variety of applications because of the possible relaxed cooling requirements as compared to helium-cooled superconductivity (conventional) phenomena. In 1987 the NASA and the Argonne National Laboratory joined in a cooperative program to identify and evaluate high payoff space and aeronautical applications of HTSC. The initial emphasis of this effort was limited and those space-power-related applications which were considered included microwave power transmission and magnetic energy storage. The results of these initial studies were encouraging and indicated the desirability for further studies.
RkJQdWJsaXNoZXIy MTU5NjU0Mg==