title: Hybrid heating systems optimization of residential environment to have thermal comfort conditions by numerical simulation.
abstract: The aim of this study is to determine optimum hybrid heating systems parameters, such as temperature, surface area of a radiant heater and vent area to have thermal comfort conditions. DOE, Factorial design method is used to determine the optimum values for input parameters. A 3D model of a virtual standing thermal manikin with real dimensions is considered in this study. Continuity, momentum, energy, species equations for turbulent flow and physiological equation for thermal comfort are numerically solved to study heat, moisture and flow field. K - ɛRNG Model is used for turbulence modeling and DO method is used for radiation effects. Numerical results have a good agreement with the experimental data reported in the literature. The effect of various combinations of inlet parameters on thermal comfort is considered. According to Pareto graph, some of these combinations that have significant effect on the thermal comfort require no more energy can be used as useful tools. A better symmetrical velocity distribution around the manikin is also presented in the hybrid system.
authors.affiliation: Mechanical Engineering Department, University of Zabol, Zabol, Iran.
authors.forename: Nabi
authors.initials: N
authors.lastname: Jahantigh
authors.affiliation: Mechanical Engineering Department, K. N. Toosi University of Technology, Tehran, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Keshavarz
authors.affiliation: Mechanical Engineering Department, K. N. Toosi University of Technology, Tehran, Iran.
authors.forename: Masoud
authors.initials: M
authors.lastname: Mirzaei
keywords: Conventional heating; Optimal conditions; Radiant panels; Thermal comfort; Virtual manikin