| Issue |
E3S Web Conf.
Volume 356, 2022
The 16th ROOMVENT Conference (ROOMVENT 2022)
|
|
|---|---|---|
| Article Number | 03029 | |
| Number of page(s) | 4 | |
| Section | Thermal Comfort and Natural Ventilation | |
| DOI | https://doi.org/10.1051/e3sconf/202235603029 | |
| Published online | 31 August 2022 | |
Thermal environment characteristics of large space building with stratified air conditioning based on Block-Gebhart model during the cooling season
1 University of Shanghai for Science and Technology, School of Environment and Architecture, 516 Jungong Road, China
2 Tongji Architectural Design (Group) Co., Ltd, 1230 Siping Road, China
* Corresponding author: hcyhyywj@163.com
The thermal environment of large space building with stratified air distribution is characterized by its obvious gradient of vertical temperature, and the stratified air conditioning load (SACL) is closely related to the thermal environment. The Block-Gebhart (B-G) model in summer is established for an actual large space building which has two stratified air distribution (STRAD) systems. One system is the air supply nozzles (ASN) arranged at middle sidewall, the other is the half-cylinder diffusers (HCD) arranged at low sidewall. In order to quickly calculate the air temperature of unoccupied zone (ATUZ), two regression equations for the air temperature gradient under the conditions of two STRAD systems were proposed. Considering six factors, the B-G model was used to calculate 648 cases and the two equations were obtained by multiple regression analysis. Through the field measurement in summer, in three cases of ASN system, the mean absolute error (MAE) between predicted and experimental values of ATUZ was 1.4°C, and the mean absolute percentage error (MAPE) was 4.5%; in three cases of HCD system, the MAE was 1.0°C and the MAPE was 3.0%. The results of this study establish the foundation for the calculation of SACL.
© The Authors, published by EDP Sciences, 2022
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