Design configuration for a higher efficiency air conditioning system in large space building

Abstract The full air conditioning and the stratified air conditioning designs in large space buildings were investigated based on air flow measurement that pertains to an in-patient hall of a hospital building. We compared and analyzed the indoor comfort parameters such as temperature and air velocity. On the basis of the measurements, we calculated the theoretical load index by solving the model for inner surface temperature of the building envelope based on the modified radiant heat transfer method. Using flow fields and parameters that are generated by computational fluid dynamics (CFD), the indoor thermal comfort when adopting the full air conditioning and the stratified air conditioning designs can be effectively analyzed. And the respective energy saving rate of the two air conditioning design loads in the hall at different storey heights, window-wall ratios, and air supply heights can be compared. Finally, the recommendation for usage of the stratified air conditioning design was put forward in large space buildings.

[1]  Bahram Moshfegh,et al.  Numerical predictions of indoor climate in large industrial premises. A comparison between different k–ε models supported by field measurements , 2007 .

[2]  Mats Sandberg,et al.  Investigation of air quality, comfort parameters and effectiveness for two floor-level air supply systems in classrooms , 2007 .

[3]  Standard Ashrae.  Thermal Environmental Conditions for Human Occupancy , 1992 .

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

[5]  Wong Nyuk Hien,et al.  Effects of double glazed facade on energy consumption, thermal comfort and condensation for a typical office building in Singapore , 2005 .

[6]  Chris T. Kiranoudis,et al.  Computational analysis of thermal comfort: the case of the archaeological museum of Athens , 2000 .

[7]  Qinglin Meng,et al.  CFD study of the thermal environment in an air-conditioned train station building , 2009 .

[8]  P. Nielsen,et al.  The Selection of Turbulence Models for Prediction of Room Airflow , 1998 .

[9]  Leon R. Glicksman,et al.  Application of integrating multi-zone model with CFD simulation to natural ventilation prediction , 2005 .

[10]  Anastasios I. Stamou,et al.  Evaluation of thermal comfort in galatsi arena of the olympics ?Athens 2004? using a CFD model , 2008 .

[11]  Wan Ki Chow,et al.  A simple two-layer zone model on mechanical exhaust in an atrium , 2005 .

[12]  Jian Guo Li,et al.  The Development and Performance Evaluation of Green Cross-Linked Movable Gel , 2011 .

[13]  Anastasios I. Stamou,et al.  Verification of a CFD model for indoor airflow and heat transfer , 2006 .

[14]  R. L. Gorton,et al.  Determination of temperature profiles and loads in a thermally stratified, air-conditioned system. I: Model studies , 1982 .

[15]  Zhiwei Lian,et al.  Air distribution numerical simulating of isothermal jet with interference parameters in large space , 2005, Simul. Model. Pract. Theory.

[16]  J. Niu,et al.  Stratified air distribution systems in a large lecture theatre: A numerical method to optimize thermal comfort and maximize energy saving , 2012 .

[17]  O. I. Stathopoulou,et al.  Indoor air quality in a dentistry clinic. , 2007, The Science of the total environment.

[18]  M.N.A. Saïd,et al.  Measurement of thermal stratification in large single-cell buildings , 1996 .

[19]  R. L. Gorton,et al.  Determination of temperature profiles and loads in a thermally stratified, air-conditioned system. II: Program description and comparison of computed and measured results , 1982 .

[20]  Jiyuan Tu,et al.  Computational Fluid Dynamics: A Practical Approach , 2007 .

[21]  E Ery Djunaedy,et al.  Thermal comfort study of an air-conditioned lecture theatre in the tropics , 2003 .

[22]  Qingyan Chen,et al.  Significant questions in predicting room air motion , 1992 .

[23]  Francis W.H. Yik,et al.  Locating air-conditioners and furniture inside residential flats to obtain good thermal comfort , 2002 .

[24]  Jian Shen,et al.  Model Experimental Study on Stratified Air Distribution with 2D-PIV for High Ceiling Industrial Plant , 2011 .

[25]  Student Member Ashrae,et al.  Air distribution effectiveness with stratified air distribution systems , 2009 .