Paper Conference

Proceedings of eSim 2016: 9th Conference of IBPSA-Canada


Energy analysis of solar chimney assisted solarium with semi-transparent photovoltaic system

Afrooz Ravanfar, Hua Ge, Zaiyi Liao

Abstract: Previous study on the performance of a solar chimney assisted solarium (SCAS) attached to a residential building showed that the integration of a solar chimney with a solarium enhances the natural ventilation of the solarium and maintains interior conditions of the building within the adaptive mean comfort temperature limits. The objective of this study is to analyse the hr Radiative heat transfer coefficient (W/m² K) hc Convective heat transfer coefficient (W/m² K) h Convective heat transfer coefficient (W/m² K) U U value (W/m² K) t Time (h) • q" energy performance of the above mentioned SCAS Heat transferred to the air stream integrated with Photovoltaic (SCASPV) system and investigate effects of integrating PV cells in the solarium under summer conditions. A thermal model is developed and implemented in SIMULINK to simulate the thermal response of solar chimney assisted solarium combined with semitransparent photovoltaic system (STPV) using a heat balance method. The greenhouse air temperature, its ventilation rate and energy production of the STPV are calculated. The numerical simulation results show that γ Coefficient of heat transfer ṁ the air volume that cross the solarium (kg/s) c f Heat capacity of the air (KJ/kgK) V Wind velocity (m/s) k f Thermal conductivity of air (1/K) Nu Nusselt number Ra Rayleigh number Pr Prandtl number α percentage of the solar radiation incident on i the STPV that is absorbed by layer i the integration of SCAS system with STPV system improves the performance of the system and produces electricity that can be used for cooling the adjacent building. NOMENCLATURE W Width (m) L Length (m) A Area (m²) T Temperature ( 🛥 K ) I incident solar radiation, kW/m² S Solar radiation incident β Coefficient of expansion of air emittance μ f Dynamic viscosity g Gravitational constant (m/s) ρ Density of the air (kg/ m³ ) o Air velocity when leaving the chimney (m/s) Cd Coefficient of discharge of air channel Ɵ Tilt angle (Radian) σ Stefan Boltzmann constant, W/(m² K⁴) PSTPV η0 ηc β 0 Power output of PV PV module efficiency at standard conditions Effective efficiency of PV PV module temperature coefficient However, Bryn and Schiefloe (1996) found that an improper design may raise the energy consumption of the building or lead to frequent overheating and high temperatures that are not desirable either for people or plant growth. Hence, to maintain the desirable condition, excess heat must be evacuated from the sunspace. β coefficient of expansion of air Area of PV (m²) STPV Subscripts S Solarium Sc Solar chimney a Ambient, air f Fluid g Glass i Inlet o Outlet r Room w Wall b Floor int Interior in Inside X, Y Surface number E Soil
Pages: 274 - 283