The reliable and economic operation of a solar thermal beating and cooling system depends on the control system and particularly the control strategy. Our work has concentrated on improving the performance and cost effectiveness of active solar cooling and heating systems by developing alternate control strategies. We have developed accurate dynamic models for evaluating the various components (such as collector, transport, storage, an chiller) and validated item experimentally . These models were used to develop an interactive computer-aided design program to investigate various control strategies.
The following publications illustrate our work in active heating and cooling systems:
1. "Filtering Algorithm for Estimating Fluid Temperature Profile in Solar Collectors" M. Sugisaka, R. Fischl, P. Herczfeld, P. Kalata, C. Rorres, Automatica, Vol. 24, No. 3, pp 211-14, May 1988
2. "Solar Collector Loop Parameter Identification Using Distributed Parameter Models from Experimental Date," J.J. Helferty, T. Jurand, R. Fischl, M. Sugisaka, T. Matsuo, 18th Pittsburgh Conf. on Modeling and Simmulation, Pittsburgh, PA, April 23-4, 1987
3. "On the Selection of Distributed Parameter Models for Studies of Solar Energy Systems," with J. Helferty, T. Brisbane, M. Sugasaki, D. Anand, ASME-JSME-JSES Solar Energy Conference, Hawaii, March, 1987.
4. "Dynamic Performance & Control Simulation of Absorption Systems," D. Anand, K. Lindler, J. Helferty, R. Fischl, Proc of ASME-JSME-JSES Solar Energy Conference, Hawaii, March, 1987.
5. "Solar Collector Loop Modeling & Experimental Validation for Distributed Parameter Models," J. Helferty, R. Fischl, T. Brisbane, 4th IFAC Symposium, pp.1015-, Los Angeles, CA, June, 1986.
6. "Filtering Algorithm for Estimating Fluid Temperature Profile in Solar Collectors Under Flow and Stagnant Conditions", M. Sugisaka, R. Fischl, P. Kalata, P.R. Herczfeld and C. Rorres, 6th IFAC Symposium on Identification and System Parameter Estimation, Washington D.C., June 7-11, 1982.
7. "Modeling and Simulation of Flat Plate Collectors for Fluid Flow Control Studies", R. Fischl, P.R. Herczfeld, A. Orbach, Proc. of International Conference on Cybernetics and Society, Atlanta, Georgia, pp. 592-9, October 1981.
8. "Optimal Control of a Solar Collector Loop Using A Distributed-Lumped Model", A. Orbach and C. Rorres, R. Fischl, Automatica, Vol. 17, No. 3, pp.525-539, 1981.
9. "Computer Simulation for Evaluating Control Strategies", S.J. Sokolowski, M.J. Fisher, P.R. Herczfeld, R. Fischl and R. Wolfson, Proc. of ASME-ASEEA Conference, Reno, Nevada, April, 1981.
10. "Experimental Validation of Dynamic Control Models", P.R. Herczfeld, G. Vardakas, R. Fischl, Proc. of ASME-ASSEA Conference, Reno, Nevada, April, 1981.
11. "Optimal and Suboptimal Control Policies for a Solar Collector System", C. Rorres, A. Orbach, R. Fischl, IEEE Transactions on Automatic Control, Vol. AC-25, No. 6, December, 1980.
12. "Control and Sensitivity Analysis of Liquid Flat-Plate Solar Collector Systems," A. Orbach, R. Fischl , Proc., 1980 Int. Symp. on Circuits and Systems, Houston, April, 1980 "Flow Control in Solar Heating and Cooling Applications", A. Orbach, P.R. Herczfeld, R. Fischl, Proc. of 1978 Annual Meeting of AS of Int. Solar Energy Soc., Vol. II, pp. 488-492, Denver, Co. August 1978.
