Generalized assessment of heat-storage accumulators based on energy profiles
- Czech Technical Univ., Prague (Czech Republic). Mechanical Engineering Dept.
- Institute of Gas Technology, Chicago, IL (United States)
The analytical and experimental work described in this paper has to do with the development of a new and practical method for designing and rating heat-storage systems operating on a heat-capacity duty cycle of several days. It was carried out as part of a broader project evaluating equipment for exploiting solar energy and heat produced by animals on animal farms. Water-type heat accumulators were found to be an essential component of these systems; however, no generalized or specialized criteria were available for their effective design. Therefore, design optimization was carried out analytically, and the resulting approach was experimentally verified. This process led to the development of generalized criteria for rating the efficiency of stored heat utilization and to the development of reservoir design guidelines that, for practical design purposes, eliminated the need for knowing storage temperature histograms. The analysis is based on defining the storage quality as the degree of perfection ({zeta}{sub e}) in terms of the initial and final exergy (available energy) ratios of the stored heat during the storage period. This function was determined analytically, experimentally verified for four design cases (with and without insulation), and related to the normalized design parameters, rate of temperature degradation, and fluid properties by time-dependent Fourier similarity number Fo. The resulting relationship of the form -- {zeta}{sub e} = k log Fo + q was correlated with the measurements. For a specified storage, the ``degree of perfection`` ({zeta}{sub e}) can then be optimized and the desirable dimensions of a reservoir selected by calculating the characteristic (or normalized) dimension from the Fourier number (Fo).
- Research Organization:
- Institute of Gas Technology, Chicago, IL (United States)
- Sponsoring Organization:
- Institute of Gas Technology, Chicago, IL (United States)
- OSTI ID:
- 10177064
- Report Number(s):
- CONF-940724-1; ON: TI94017661
- Resource Relation:
- Conference: International compressor engineering conference,West Lafayette, IN (United States),19-22 Jul 1994; Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
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