Experimentally Study on Optimal Control of the Inertia of Water on the Thermal Performance of All-glass Evacuated Tube Solar Collector
DOI:
https://doi.org/10.54536/ajenr.v2i1.1219Keywords:
Evacuated Tube Solar Collector, Inertia of Water, Optimal Flow ControlAbstract
This article aims to investigate the effect of inertia on the outlet temperature of an evacuated tube solar collector. The experiments were conducted during a 24h period in Minquin County (latitude 38034’N, Longitude 10303’E). An analysis was made to determine whether the evacuated tube solar collectors’ fluid thermal inertia impacts the water storage tank temperature. The results showed differences between the useful energy delivered to the water storage tank in the case with mass flow rate adjusted depending on the incident solar radiation for the entire two days in which experiments were conducted. Two days of cloud and sunshine were considered. An indirect optimal control technique refers to the impacts of the inertia of water on the outlet collector temperature, the on/off control of the pump, and the useful heat gain from the storage tank. During days with clear sky, the average solar radiation, mass flow rate, outlet, and tank temperature were 640.02W/m2, 0.06kg/s, 290C, and 44.240C, respectively. For cloudy day was 449W/m2, 0.02kg/s, 270C and 420C respectively. The control system is provided to run the heating circulating pump after rest for several minutes to facilitate the exhaust system, then continues to run for a cycle. The DTP,ON and DTP, OFF range from 30C to 100C and from 0.20C to 1.50C, respectively.
Downloads
References
Badescu, V. (2008). Optimal control of flow in solar collector systems with fully mixed water storage tanks. Energy Convers. Manage., 49(2), 169–184.
Beckman, W.A., Thornton, J., Long, S., & Wood, B.D. (1994). Control problems in solar domestic hot water systems. Solar Energy, 53(3), 233–6.
Bejan, A. (1982). Extraction of exergy from solar collectors under time varying conditions. Int. J. Heat Fluid Flow, 3(2), 67–72. http//doi.org/10.1016/j.apm.2016.12.033
Bejan, A., & Schultz, W. (1982). Optimum flow-rate history for cooldown and energy storage processes. Int. J. Heat Mass Transfer, 25(8), 1087–92. http//doi.org/10.1016/0142-727X(82)90002-9
Bejan, A., and Schultz, W. (1982). Optimum flow-rate history for cooldown and energy storage processes. Int. J. Heat Mass Transfer, 25(8), 1087–1092.
Furbo, S., and Shah, L. J. (1996). Optimum solar collector fluid flow rates. Proc., EuroSun, DGS Sonnenenergie Verlags, DGS Sonnenenergie Verlags, Munich, 189–193.
Han Zongwei, Zheng Maoyu. Experimental Research on Solar Assisted Ground Source Heat Pump Heating System with a Latent Heat Storage Tank in Severe Cold Area. Acta Energiae Solaris Sinica, 29(5), 574-580, 2008. http//doi.org/10.17577/ijertv3Is040400.
Hollands, K. G. T., and Brunger, A. P. (1992). Optimum flow rates in solar water heating systems with a counterflow exchanger. Solar Energy, 48(1), 15–19.
Horel, J. D., and De Winter, F. (1978). Investigations of methods to transfer heat from solar liquid-heating collectors to heat storage tanks. Final Rep. on U.S. Dept. of Energy Contract, 4, 1238, Altas Corporation, Santa Cruz, CA.
John A. Duffie. Solar Engineering of Thermal Processes. Culinary & Hospitality Industry Publications Services, John Wiley & Sons, Incorporated, New York, 1991, 20-22
Knudsen, S. (2002). Consumers’ influence on the thermal performance of small SDHW systems. Solar Energy, 73(1), 33–42. http//doi.org/10.1016/S0038-092X(02)00018-X
Kovarik, M., and Lesse, P. F. (1976). Optimal control of flow in low temperature solar heat collectors. Solar Energy, 18(5), 431–435. http//doi.org/10.1016/0038-092X(76)90009-8
Nhut, L. M., and Park, Y. C. (2013). A study on automatic optimal operation of a pump for solar domestic hot water system. Solar Energy, 98, 448–457.
Saltiel, C., and Sokolov, M. (1985). Optimal control of a multicomponent solar collector system. Solar Energy, 34(6), 463–473. http//doi.org/10.1016/0038-092X(85)90020-9
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2023 Uwayezu Emmanuel, Hakizabera Olivier, Hirwa Gloria, Nkubito Muhayeyezu Jean Olivier
This work is licensed under a Creative Commons Attribution 4.0 International License.
