Numerical Simulation of a Solar Domestic Hot Water System

32nd UIT (Italian Union of Thermo–fluid-dynamics) Heat Transfer Conference

物理学;力学

Mongibello, L.^1 ; Bianco, N.^2 ; Di Somma, M.^2 ; Graditi, G.^1 ; Naso, V.^2

ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Portici RC, Napoli, Italy^1

Dipartimento di Ingegneria Industriale (DII), Università Degli Studi Federico II, Napoli, Italy^2

关键词: Energy conservation equations;    Euler implicit scheme;    Experimental values;    Implicit algorithm;    One-dimensional model;    Solar domestic hot water systems;    Solar domestic hot waters;    Solar irradiances;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/547/1/012015/pdf
DOI  :  10.1088/1742-6596/547/1/012015

学科分类：力学，机械学

来源: IOP

【 摘 要 】

An innovative transient numerical model is presented for the simulation of a solar Domestic Hot Water (DHW) system. The solar collectors have been simulated by using a zerodimensional analytical model. The temperature distributions in the heat transfer fluid and in the water inside the tank have been evaluated by one-dimensional models. The reversion elimination algorithm has been used to include the effects of natural convection among the water layers at different heights in the tank on the thermal stratification. A finite difference implicit scheme has been implemented to solve the energy conservation equation in the coil heat exchanger, and the energy conservation equation in the tank has been solved by using the finite difference Euler implicit scheme. Energy conservation equations for the solar DHW components models have been coupled by means of a home-made implicit algorithm. Results of the simulation performed using as input data the experimental values of the ambient temperature and the solar irradiance in a summer day are presented and discussed.