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RESEARCH PAPERS

Investigation of Cold Filling Receiver Panels and Piping in Molten-Nitrate-Salt Central-Receiver Solar Power Plants

[+] Author and Article Information
J. E. Pacheco, M. E. Ralph, J. M. Chavez

Solar Thermal Technology and Test Departments, Sandia National Laboratories, Albuquerque, NM 87185-0703

J. Sol. Energy Eng 117(4), 282-289 (Nov 01, 1995) (8 pages) doi:10.1115/1.2847839 History: Received February 01, 1995; Revised May 01, 1995; Online February 14, 2008

Abstract

Cold filling refers to flowing a fluid through piping or tubes that are at temperatures below the fluid’s freezing point. Since the piping and areas of the receiver in a molten-nitrate salt central-receiver solar power plant must be electrically heated to maintain their temperatures above the nitrate salt freezing point (430°F, 221°C), considerable energy could be used to maintain such temperatures during nightly shutdown and bad weather. Experiments and analyses have been conducted to investigate cold filling receiver panels and piping as a way of reducing parasitic electrical power consumption and increasing the availability of the plant. The two major concerns with cold filling are (1) how far can the molten salt penetrate cold piping before freezing closed, and (2) what thermal stresses develop during the associated thermal shock. Cold fill experiments were conducted by flowing molten salt at 550°F (288°C) through cold panels, manifolds, and piping to determine the feasibility of cold filling the receiver and piping. The transient thermal responses were measured and heat transfer coefficients were calculated from the data. Nondimensional analysis is presented which quantifies the thermal stresses in a pipe or tube undergoing thermal shock. In addition, penetration distances were calculated to determine the distance salt could flow in cold pipes prior to freezing closed.

Copyright © 1995 by The American Society of Mechanical Engineers
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