In the paper a dynamic model for simulating the behavior of a thermal solar collector is presented. The collector is unglazed with a metal receiving pipe thermally linked to fins and presents thermal insulation in the back side and surface. The main characteristic of the proposed model is its capability of simulating the thermal performances for any given time discretization or collector axial discretization. The routine implemented is such to generate the system of partial differential equations (in matrix form) which dimension depends on the number of axial nodes assumed (nx); the system is then numerically integrated upon the imposed discretization time (∆t). The model realized is “White Box” (all phenomena occurring within the component are studied referring to physical equations) and “State Determined” (state variables can be defined: energy storage is possible and heat can be accumulated both in the metal absorber and in the Heat Transfer Fluid). The collector pipe is split up into nx segments (axial discretization) with length ∆x; for each of the segments energy conservation equations are applied to both the metal pipe and the Heat Transfer Fluid flowing within it. The component therefore presents a 2 node distribution in the longitudinal direction. The model is realized within Simulink® and is based on a Matlab® S-Function where all the equations are implemented in parameterized form and integrated. Results of are proposed from dynamic simulations with different degrees of axial discretization of the system and with time varying inputs.

Dynamic model of a thermal solar collector / Gambarotta, Agostino; Vaja, Iacopo. - 1:(2007), pp. 1-14. (Intervento presentato al convegno 6th EUROSIM Congress on Modelling and Simulation - EUROSIM 2007 tenutosi a Ljubljana, Slovenia nel 9/2007).

### Dynamic model of a thermal solar collector.

#### Abstract

In the paper a dynamic model for simulating the behavior of a thermal solar collector is presented. The collector is unglazed with a metal receiving pipe thermally linked to fins and presents thermal insulation in the back side and surface. The main characteristic of the proposed model is its capability of simulating the thermal performances for any given time discretization or collector axial discretization. The routine implemented is such to generate the system of partial differential equations (in matrix form) which dimension depends on the number of axial nodes assumed (nx); the system is then numerically integrated upon the imposed discretization time (∆t). The model realized is “White Box” (all phenomena occurring within the component are studied referring to physical equations) and “State Determined” (state variables can be defined: energy storage is possible and heat can be accumulated both in the metal absorber and in the Heat Transfer Fluid). The collector pipe is split up into nx segments (axial discretization) with length ∆x; for each of the segments energy conservation equations are applied to both the metal pipe and the Heat Transfer Fluid flowing within it. The component therefore presents a 2 node distribution in the longitudinal direction. The model is realized within Simulink® and is based on a Matlab® S-Function where all the equations are implemented in parameterized form and integrated. Results of are proposed from dynamic simulations with different degrees of axial discretization of the system and with time varying inputs.
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2007
9783901608322
Dynamic model of a thermal solar collector / Gambarotta, Agostino; Vaja, Iacopo. - 1:(2007), pp. 1-14. (Intervento presentato al convegno 6th EUROSIM Congress on Modelling and Simulation - EUROSIM 2007 tenutosi a Ljubljana, Slovenia nel 9/2007).
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Utilizza questo identificativo per citare o creare un link a questo documento: `https://hdl.handle.net/11381/1712929`
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