Analysis on the thermal environment of the supporting room of sports stadium with air-conditioning system in winter

2011 ◽  
Author(s):  
Yongqiang Xiao
Keyword(s):  
Air Conditioning ◽  
Thermal Environment ◽  
Air Conditioning System

scholarly journals Simulation and experimental study of phase change cooling and heating wall radiation air conditioning system

2020 ◽  
Vol 143 ◽  
pp. 02044
Author(s):  
Gao Chunxue ◽  
Wu Songlin ◽  
Lang Junqian ◽  
Liu Qiuxin
Keyword(s):  
Phase Change ◽  
Thermal Performance ◽  
Air Conditioning ◽  
Field Experiments ◽  
Thermal Environment ◽  
Operating Conditions ◽  
Operation Condition ◽  
Heating Wall ◽  
Air Conditioning System ◽  
Winter Operation

This paper presents a case study of phase change cooling and heating wall radiant (PC-CHWR) air conditioning system application in an energy-saving renovation project in a laboratory in Wuhan, Hubei province in China. To test the thermal performance of the system, the PHOENICS software was utilized to simulate and analyse the indoor thermal environment in the laboratory under both winter and summer operating conditions. In addition, field experiments were also conducted under winter operation condition. By comparing the results between numerical simulation and field experiment, it is found that thermal performance of the PC-CHWR air conditioning system evaluated by these two evaluation methods are quite match. Moreover, the results also show that the PC-CHWR system can meet the cooling and heating load of the building within the acceptable range.

scholarly journals Evaluation of Thermal Behavior of the Skeleton in a Green Building with the Aid of TABS

2019 ◽  
Vol 111 ◽  
pp. 01085
Author(s):  
Hiroshi Muramatsu ◽  
Tatsuo Nobe
Keyword(s):  
Heat Flux ◽  
Thermal Behavior ◽  
Air Conditioning ◽  
Natural Ventilation ◽  
Thermal Environment ◽  
Concrete Slab ◽  
Ventilation System ◽  
Office Building ◽  
Air Conditioning System ◽  
Indoor Thermal Environment

In this study, an office building in Japan that incorporates energy-saving features and environmental technologies was investigated. This office building features a green façade, natural ventilation, a concrete slab with no suspended ceilings, and thermo-active building systems. Two airconditioning systems were installed in this building—a ceiling radiation air-conditioning system and a whole floor-blow off air conditioning system. In addition, a natural ventilation system was installed. We surveyed the heat flux of the ceiling surface and indoor thermal environment of this building from 2015 through 2016. The ceiling using the heat storage amount of concrete maintains a constant temperature in the workplace during as well as after office hours. We also performed detailed measurements of the heat flux of the ceiling surface and indoor thermal environment in the summer of 2017. The results showed that the ceiling radiation air-conditioning system provided a stable thermal environment. Furthermore, we report that making use of the thermal behavior of the skeleton improved the operation of the ceiling radiation airconditioning system.

scholarly journals Human-Oriented Design of an Indoor Thermal Environment

2019 ◽  
Vol 111 ◽  
pp. 02001
Author(s):  
Masanari Ukai ◽  
Tatsuo Nobe
Keyword(s):  
Air Conditioning ◽  
Thermal Environment ◽  
Thermal Sensation ◽  
Hot Spot ◽  
Clothing Insulation ◽  
Air Conditioning System ◽  
Indoor Thermal Environment ◽  
Initial Survey ◽  
Air Conditioning Systems ◽  
Temperature Side

In this study, an initial survey of clothing insulation and changes in the metabolic rate of individuals in office spaces was performed to establish the distribution of room temperatures at which individuals perceived a neutral thermal sensation. Subsequently, the indoor thermal environment in four offices was surveyed during the summer with different air-conditioning systems to determine the thermal environment stability in each case. The results revealed that for the required temperature, there was a noticeable difference between the average and most frequent values. Moreover, it was determined that the required temperature distribution is not normal, but rather, it is skewed to the low-temperature side. In addition, the radiant air-conditioning system was found to generate a narrow distribution of the equivalent temperature and hence, facilitated a more uniform thermal environment compared to a convective (multi-unit) air-conditioning system. Therefore, in buildings with convective air-conditioning systems, even if the planar average thermal environment is categorized as comfortable, it may be possible that workers who are sensitive to the cold or heat will complain of discomfort more frequently than those in buildings with radiant air-conditioning systems because the probability of workers sitting in cold- or hot-spot areas is higher in the former case.

A Numerical Simulation of an Air Conditioning System in Office Using Weak Airflow

2003 ◽  
Author(s):  
Sensuke Shimizu ◽  
Haruo Terasaka ◽  
Akira Yamada
Keyword(s):  
Numerical Simulation ◽  
Air Conditioning ◽  
Thermal Environment ◽  
Thermal Sensation ◽  
Air Conditioner ◽  
Air Conditioning System ◽  
The People

The objective in this study is to evaluate thermal environment of a room with an advanced ceiling hidden type air-conditioner using numerical simulation. As the characteristic of the air-conditioner, it supplies a weak airflow from a large inlet to a room. Circulator fans are fixed on the ceiling. Numerical simulation is performed to a room with the air-conditioner. PMV [1] is calculated from the obtained data and thermal sensation of the people is investigated. From the PMV distribution, it was found that this sensation was improved by the advanced air-conditioner.

scholarly journals Applicability of the whole-house air conditioning system in cold climate district

2019 ◽  
Vol 111 ◽  
pp. 06036
Author(s):  
Sihwan LEE ◽  
Takuya KISHI ◽  
Yoshiharu ASANO
Keyword(s):  
Heat Shock ◽  
Temperature Difference ◽  
Air Conditioning ◽  
Room Temperature ◽  
Thermal Environment ◽  
Residential Buildings ◽  
Cold Climate ◽  
Airflow Rate ◽  
Air Conditioning System ◽  
The Individual

The number of sudden deaths while bathing related to heat shock in Japan is approximately 17,000 people for a year. This number is over 30% of elderly people dying in the residential buildings. To solve this problem, it is effective to introduce a whole-house air conditioning system in the residential buildings. The purpose of this study is to evaluate the applicability of the whole-house air conditioning system in cold climate district in Japan. To achieve this goal, this study is evaluated the thermal environment by using the whole-house air conditioning system and compared with individual air conditioning system. The results show that the maximum room temperature difference is measured approximately 6.8 ºC. As the reverse simulation in the study, this temperature difference can be decreased to approximately 4 ºC by adjusting the supply airflow rate. When the individual air conditioning is used, the room temperature difference is 7.5 ºC. It means that using the whole-house air conditioning system decreases the room temperature difference and reduces heat shock risk. It is also possible to raise the surface temperature of the wall by 20 to 30 % than in case of using individual air conditioning, thus it is effective in preventing dew condensation on the wall surface.

Numerical Investigation on Thermal Environment inside the Passenger Compartment of a Highway Sleeper Coach

2011 ◽  
Vol 55-57 ◽  
pp. 215-218
Author(s):  
Xu Liang Xie ◽  
Fu Lin Shen
Keyword(s):  
Temperature Field ◽  
Air Conditioning ◽  
Thermal Environment ◽  
Solar Irradiation ◽  
Discrete Ordinates ◽  
Passenger Compartment ◽  
Radiation Model ◽  
Air Conditioning System ◽  
Characteristic Distribution ◽  
Air Inlet

In order to verify thermal comfort of a 12-meter-long highway sleeper coach equipped with a four-ducted air-conditioning system, the thermal environment inside the passenger compartment was numerical investigated with RNG k-ε turbulence model. Also, discrete ordinates radiation model was applied to consider the effect of solar irradiation. The characteristic distribution of the airflow organization and temperature field were obtained and compared with experiment results. Results show that the air flow and temperature distribution inside the passenger compartment are not uniform and greatly influenced by solar radiation and air inlet parameters.

Individual Thermal Environments of Building with a Novel Air-Conditioning Energy-Saving Equipment

2013 ◽  
Vol 368-370 ◽  
pp. 645-648
Author(s):  
Nguyen Anh Tuan ◽  
Wu Chieh Wu ◽  
Huy Bich Nguyen
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Thermal Environment ◽  
Air Conditioning System ◽  
Outlet Port ◽  
3 Dimensional ◽  
Thermal Environments ◽  
Energy Saving Potential ◽  
Environment Control ◽  
Port Opening

Individual air-conditioning system (IACS) can create an individual thermal environment control in a workroom which can contribute to save air-conditioning energy. In this study, we analyze the airflow circulation cell of the IACS with varied outlet port opening dimensions using the computational fluid dynamics (CFD) technique. We created an IACS, two workstations, lightings, and a cabinet in a 3-dimensional room. The fluid was assumed to be Newtonian, unsteady, and incompressible. We examined the effects of the outlet port opening on airflow circulation establishing process. Results will indicate the suitable outlet port opening for maintaining individual satisfied occupants’ requirements and improving energy saving potential.

Sign in / Sign up

Export Citation Format

Share Document