Mathematical modelling of the indoor ice arena with two control volumes for calculation of the air exchange

21st International Scientific Conference on Advanced in Civil Engineering "Construction - The Formation of Living Environment"

土木建筑工程

Sargsyan, Samvel^1 ; Zhila, Viktor^1

Moscow State University of Civil Engineering, Yaroslavskoye shosse, 26, Moscow

129337, Russia^1

关键词: Analytical method;    Dynamic coefficient;    Exhaust ventilation;    Heat and mass transfer;    Moisture parameters;    Parameter calculation;    Two-control-volume;    Ventilation and air conditioning;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/365/2/022059/pdf
DOI  :  10.1088/1757-899X/365/2/022059

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The existing methods of calculation of ventilation and air conditioning systems in the indoor ice skating arenas specify the audience stand area zone separately of the ice rink space. They do not take into account interaction of the zones, which have different temperature and moisture parameters. Calculation of the required air exchange of the ice field area is represented herein through mathematical modelling, which reasonably divide the space volume in two distinctive control areas. A mathematical model of the physical process, which takes place in the indoor ice arena space, enables determination of the air exchange to get the required normative parameters of the air in separate space KOs. The suggested method proposes a procedure of the microclimate parameter calculation of separate control volumes of the indoor ice arena space, when the air is distributed according to an "up-to-down" scheme. It will permit to determine the parameters and the operation modes of supply and exhaust ventilation equipment. The method takes into account the processes of heat- and mass transfers in two distinctive control volumes of the ventilated area under permanent conditions. Methodical bases are developed for physically reasonable way of calculating the required air exchange, bearing maximal consideration of the factors influencing heat-air processes in the ventilated volume as a whole and according to two separate typical control volumes of the indoor ice arena ventilated space. The dependence of changes of the relative air consumption in an axis-symmetric jet from the sectional area of the hole, the height of location and the dynamic coefficient of the diffuser are given herein. The method allows determination of the location height and the type of the air diffuser, as well as the air parameters at the jet outlet from the diffuser to provide the design air parameters at the jet inlet into the skating-rink area. There are presented the air jet temperature changes at the jet inlet in the serviced area, as well as the air jet temperature changes at the outlet of the diffuser depending on the amount of the inflow air and the location height of the diffusers. The submitted I-d diagram shows the changes of the air inflow jet settings in the indoor skating-rink space with two control volumes, when the air exchange is made according to the "top-to-down" scheme. The graph-analytical method of the air parameter calculations in the skating-rink area on the basis of I-d-chart, allows to consider the process of mixing air of two control volumes and to clarify the air parameters at the diffuser jet outlet, taking into account the type of the jet, the height of the diffuser location and the characteristics of the diffuser. If the air exchange of the ice rank zone is performed according to the "top-to-down" scheme, the availability of heat and humidity emissions in II KO (stands zone) makes reasonable provision of the inflow air supply by the smallest possible number of the air diffusers, as well as determination of the height of the air diffuser location closer to the served area of the ice rink.