Edge stresses in spherical-shell solar receivers
Technical Report
·
OSTI ID:6325237
The suitability of using spherical silicon carbide shells as heat exchangers in solar energy receivers is investigated. The responses of several such shells to the required thermal and pressure loads are examined quantitatively. Shells of different edge diameters, depth, and thicknesses are considered. Numerical data are presented which describe the maximum tensile and compressive stresses arising from heat-transfer requirements and the shells' nominal diurnal temperature cycle. These data describe the stresses resulting from a range of edge conditions. Relatively simple minimum-stress boundary conditions are identified. The characteristics of a pressure seal and edge-support mechanism that permit these minimum-stress boundary conditions to be realized are discussed. The temperature of the middle surface of each shell and the temperature gradient through its thickness are assumed to be uniform over the entire shell. Two design approaches avoid large deviations from the minimum-stress boundary conditions: (1) hemispherical shells can be freely supported; and (2) shallow shells can be restrained by a clamp that accommodates changes in the diameter and rotation of a shell's edge. These designs are compatible with minimizing the effects of thermal transients whose time scale is substantially shorter than the diurnal cycle.
- Research Organization:
- Massachusetts Inst. of Tech., Lexington (USA). Lincoln Lab.
- DOE Contract Number:
- AC02-78ET21015
- OSTI ID:
- 6325237
- Report Number(s):
- DOE/ET/21015-11; ON: DE81029713
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
14 SOLAR ENERGY
141000* -- Solar Collectors & Concentrators
BOUNDARY CONDITIONS
CARBIDES
CARBON COMPOUNDS
COMPUTER CALCULATIONS
COMPUTER CODES
CONFIGURATION
DAILY VARIATIONS
DESIGN
DOMED STRUCTURES
ENERGY TRANSFER
HEAT EXCHANGERS
HEAT TRANSFER
MECHANICAL STRUCTURES
MEDIUM PRESSURE
PRESSURE GRADIENTS
SHELLS
SILICON CARBIDES
SILICON COMPOUNDS
SOLAR RECEIVERS
SPHERICAL CONFIGURATION
STRESSES
SUPPORTS
THERMAL STRESSES
VARIATIONS
141000* -- Solar Collectors & Concentrators
BOUNDARY CONDITIONS
CARBIDES
CARBON COMPOUNDS
COMPUTER CALCULATIONS
COMPUTER CODES
CONFIGURATION
DAILY VARIATIONS
DESIGN
DOMED STRUCTURES
ENERGY TRANSFER
HEAT EXCHANGERS
HEAT TRANSFER
MECHANICAL STRUCTURES
MEDIUM PRESSURE
PRESSURE GRADIENTS
SHELLS
SILICON CARBIDES
SILICON COMPOUNDS
SOLAR RECEIVERS
SPHERICAL CONFIGURATION
STRESSES
SUPPORTS
THERMAL STRESSES
VARIATIONS