Experimental analysis and modeling of hydronic radiant ceiling panels using transient-state analysis

Abstract The model developed in this investigation considers the hydronic panels as a transient-state heat exchanger connected to a detailed lumped transient model of the building. The behavior of the hydronic ceiling system and the interactions with its environment has been experimentally and numerically evaluated. This article presents the results of a study performed to develop a transient model of hydronic ceiling panels in heating or cooling modes and its environment (window, building structure, internal thermal loads and ventilation). Only the dry regime is considered in this case. Using as inputs the hydronic ceiling and room dimensions, material properties and the transient measurements of the air temperature at the adjacent zones, climatic conditions, supply air and water temperatures and mass flow rates, the model permits to estimate the water exhaust temperature, ceiling average surface temperature, resultant and dry air room temperatures, hydronic ceiling power and internal surface temperatures of the room in order to compare with measurements taken during the commissioning process. Two transient tests in heating and cooling modes are used to the experimental validation.

[1]  T. Yuge,et al.  Experiments on Heat Transfer From Spheres Including Combined Natural and Forced Convection , 1960 .

[2]  Jianlei Niu,et al.  Indoor climate in rooms with cooled ceiling systems , 1994 .

[3]  K. A. Antonopoulos,et al.  Experimental and theoretical studies of space cooling using ceiling-embedded piping , 1997 .

[4]  Stéphane Bertagnolio,et al.  Building and HVAC system simulation with the help of an engineering equation solver , 2008 .

[5]  Jacques Miriel,et al.  Radiant ceiling panel heating–cooling systems: experimental and simulated study of the performances, thermal comfort and energy consumptions , 2002 .

[6]  Jean Lebrun,et al.  Experimental study and modeling of cooling ceiling systems using steady-state analysis , 2010 .

[7]  Stanley A. Mumma,et al.  Simplified cooling capacity estimation model for top insulated metal ceiling radiant cooling panels , 2004 .

[8]  Refrigerating.  ASHRAE handbook of fundamentals , 1967 .

[9]  Stéphane Bertagnolio,et al.  Dynamic Thermal Modeling of a Radiant Panel System and its Environment for Commissioning: Application to a Case Study , 2009 .

[10]  Cristian Cuevas,et al.  Testing and thermal modeling of radiant panels systems as commissioning tool , 2010 .

[11]  Gerd Hauser,et al.  Computer simulation of hydronic heating/cooling system with embedded pipes , 2000 .

[12]  Martin Behne,et al.  Indoor air quality in rooms with cooled ceilings.: Mixing ventilation or rather displacement ventilation? , 1999 .

[13]  Muhammad M. Rahman,et al.  Transient Conjugate Heat-Transfer Model for Circular Tubes Inside a Rectangular Substrate , 2006 .

[14]  Frank P. Incropera,et al.  Fundamentals of Heat and Mass Transfer , 1981 .

[15]  Mats Sandberg,et al.  Experimental investigation of the velocity field and airflow pattern generated by cooling ceiling beams , 2001 .

[16]  Hazim B. Awbi,et al.  Mixed convection from heated room surfaces , 2000 .

[17]  Geoffrey P. Hammond,et al.  Improved data correlations for buoyancy-driven convection in rooms , 1983 .