Control Strategy of Solar Thermal Cooling System under the Indonesia Climate

Authors: Budihardjo Sarwo Sastrosudiro, Arnas Lubis, Muhammad Idrus Alhamid, Nasruddin Jusuf

Abstract:

Solar thermal cooling system was installed on Mechanical Research Center (MRC) Building that is located in Universitas Indonesia, Depok, Indonesia. It is the first cooling system in Indonesia that utilizes solar energy as energy input combined with natural gas; therefore, the control system must be appropriated with the climates. In order to stabilize the cooling capacity and also to maximize the use of solar energy, the system applies some controllers. Constant flow rate and on/off controller are applied for the hot water, chilled water and cooling water pumps. The hot water circulated by pump when the solar radiation is over than 400W/m², and the chilled water is continually circulated by pump and its temperature is kept constant 7 °C by absorption chiller. The cooling water is also continually circulated until the outlet temperature of cooling tower below than 27 ^oC. Furthermore, the three-way valve is used to control the hot water for generate vapor on absorption chiller. The system performance using that control system is shown in this study results.

Keywords: Absorption chiller, control system, solar cooling, solar energy.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1339229

References:

[1] Mohd Zainal Abidin Ab Kadir and Yaaseen Rafeeu. A review on factors for maximizing solar fraction under wet climate environment in Malaysia. Renewable and Sustainable Energy Reviews 14 (2010) 2243-2248.
[2] O. Marc et al. 2010, Experimental investigation of a solar cooling absorption system operating without any backup system under tropical climate, Energy and Buildings 42: 774–782
[3] M. Izquierdo et al. 2014, Solar-powered single-and double-effect directly air-cooled LiBr–H2O absorption prototype built as a single unit, Applied Energy 130: 7–19.
[4] P. Bermejo et al. 2010, Solar absorption cooling plant in Seville, Solar Energy 84: 1503–1512.
[5] H. Yabase, Solar Air-conditioning System Using Single-Double Effect Combined Absorption Chiller, The 5th International Meeting of Advances in Thermo-Fluids, UI-022, 2012
[6] Ministry of Energy and Mineral Resources Indonesia. Energy Outlook 2013, Jakarta.
[7] Suri M, Cebecauer T. Global Horizontal Radiation 2015