Numerical Investigations of Air Flow Patterns and Thermal Comfort in an Ice-Cream Factory Conditioned by Conventional Air Conditioning or Radiant Cooling Systems

2012 ◽  
Author(s):  
Essam Khalil ◽  
Waled Sweida
Keyword(s):  
Thermal Comfort ◽  
Air Conditioning ◽  
Air Flow ◽  
Ice Cream ◽  
Flow Patterns ◽  
Cooling Systems ◽  
Numerical Investigations ◽  
Radiant Cooling

scholarly journals The Examination of Air Blowing Method and Thermal Comfort of Variable Air Conditioning System using Coanda Effect

2019 ◽  
Vol 111 ◽  
pp. 01079
Author(s):  
Hikari Sakakibara ◽  
Takashi Akimoto ◽  
Hitomi Igarashi ◽  
Shunsuke Nakamura ◽  
Madoka Kimura
Keyword(s):  
Thermal Comfort ◽  
Air Conditioning ◽  
Air Flow ◽  
Building Design ◽  
Upper Body ◽  
Coanda Effect ◽  
Subjective Perception ◽  
Air Conditioning System ◽  
Air Blowing ◽  
Coandǎ Effect

The “Strategic Energy Plan” implemented by the Cabinet of Japan in 2014 strives for zero energy building design for typical new construction by 2030. The present study focuses on a ductless and variable air conditioning system, using the Coanda effect, with the aim of reducing fan power, and saving of resources by reducing the space between the ceiling. In this study, we examined the air blowing method and evaluated thermal comfort using computational fluid dynamics as well as subjective perception of coolness in a midsize office. A draft zone was reduced by extending the interval between conditioned air outlets. However, if the extension of throw length was excessive, hot space would be formed near the air outlets, and there would be a risk of impacting thermal comfort. Moreover, we confirmed that the thermal comfort was generally favourable. In particular, perceived thermal comfort was better at the position in the office where the air flow landed on the upper body of the subjects. On the other hand, it decreased when the influence of the air flow was small, and at the point where air flow landed on the lower body of the subjects.

scholarly journals Cooling without Air Conditioning: Membrane-Assisted Radiant Cooling for Expanding Thermal Comfort Zones Globally

2020 ◽  
Author(s):  
Eric Teitelbaum ◽  
Adam Rysanek ◽  
Jovan Pantelic ◽  
Dorit Aviv ◽  
Lea Ruefenacht ◽  
...  
Keyword(s):  
Thermal Radiation ◽  
Thermal Comfort ◽  
Air Conditioning ◽  
Air Cooling ◽  
Humidity Control ◽  
Tropical Environments ◽  
Radiant Cooling ◽  
Global Cooling ◽  
Paradigm Shifting

In this paper, we present results from a world-first radiant cooling pavilion, demonstrating a method of cooling people without cooling the air. Instead, surfaces are chilled and thermal radiation is used to keep people cool. A thermally-transparent membrane is used to prevent unwanted air cooling and condensation, a required precursor to deploying radiant cooling panels without humidity control in tropical environments. The results from this thermal comfort study demonstrate the ability to keep people comfortable with radiation in warm air, a paradigm shifting approach to thermal comfort that may help curb global cooling demand projections.

Air Flow in Large Space Building with CFD Model and Local Test

2011 ◽  
Vol 213 ◽  
pp. 260-266
Author(s):  
Jun Wang ◽  
Hai Xia Wang
Keyword(s):  
Energy Efficiency ◽  
Thermal Comfort ◽  
Air Conditioning ◽  
Air Flow ◽  
Air Distribution ◽  
Cfd Model ◽  
Large Space ◽  
Air Conditioning System ◽  
Local Test ◽  
Comparison And Analysis

Simulation with CFD and local test are two main methods in study on air flow in large space building. This paper tests and simulates thermal comfort and air distribution of existing air- conditioning mode of some exhibition center. Through comparison and analysis on existing and simulated air-conditioning pattern, draw a conclusion that it’s feasible to simulate thermal comfort and air distribution of air-conditioning. And the research is important to guide energy efficiency and design optimization of air-conditioning system in large space building.

Flow Regimes and Thermal Comfort Around Spectators in Air Conditioned Squash Courts

2011 ◽  
Author(s):  
Hesham S. A. Munem ◽  
ElSayed K. Abou El Kassem ◽  
Essam E. Khalil
Keyword(s):  
Thermal Comfort ◽  
Air Conditioning ◽  
Cfd Simulation ◽  
Air Flow ◽  
Flow Regimes ◽  
Flow Properties ◽  
Simulation Techniques ◽  
Heated Air ◽  
Computational Fluid Dynamics Cfd ◽  
Humidity Profiles

Although there are still a number of squash arenas that are not air-conditioned or heated; Air conditioning of squash courts has become a trend when design and establishing new squash courts as well as other sporting arena. The current paper numerically investigates the influence of location and number of air conditioning supply and extracts openings on air flow properties in spectators’ area within a squash area. The present work focuses on predicting air flow patterns and thermal behaviour through investigating of the air flow regimes and moisture content inside the spectators’ area. Furthermore, the work investigates the heat transfer behaviour through analysing temperature and relative humidity profiles within the area. Moreover, carbon dioxide dispersion is investigated in order to recommend design features that aid to achieve the thermal comfort environment inside the studied area. The present investigation made use of Computational Fluid Dynamics (CFD) simulation techniques as embedded in the commercially available code (FLUENT 6.2).

Interior air flow simulation in railway rolling stock

2002 ◽  
Vol 216 (4) ◽  
pp. 231-236 ◽  
Author(s):  
T Berlitz ◽  
G Matschke
Keyword(s):  
Thermal Comfort ◽  
Air Conditioning ◽  
Air Flow ◽  
Flow Simulation ◽  
Full Scale ◽  
Rolling Stock ◽  
Parameter Variations ◽  
Normative Requirements ◽  
Scale Test ◽  
Technical Features

For the thermal comfort of passengers in modern trains thermodynamic parameters such as pressure, temperature and relative humidity are important, but also technical features such as location, velocity and direction of the air supplied to the compartment must not be neglected. By applying computational fluid dynamics (CFD) to the simulation of the interior air flow, time- and cost effectiveness can be increased significantly: in an early development phase, where influencing the design and the concept is still possible with low additional effort, air conditioning can be optimized in a very cost- and time-effective way. Thus, by exceeding the normative requirements the passenger's needs are met more closely and more easily. After validation of the method and numerical model by full-scale measurements, a powerful and sound tool for parameter variations and the design and construction of air-conditioning facilities is obtained. The interior air flow in the first-class compartment of a regional train was simulated numerically. Thermodynamic and aerodynamic parameters were measured in a full-scale test train for the validation. The results show the ability of CFD to deal with parameter variations and the prediction of thermal comfort. Benefits and drawbacks and the limits of the application of CFD have been worked out.

scholarly journals THERMAL COMFORT OF TASK AIR CONDITIONING WITH ISOTHERMAL AIR FLOW UNIT

2004 ◽  
Vol 69 (575) ◽  
pp. 75-82 ◽  
Author(s):  
Sueg-jae LEE ◽  
Shin-ichi TANABE ◽  
Tatsuo NOBE
Keyword(s):  
Thermal Comfort ◽  
Air Conditioning ◽  
Air Flow ◽  
Flow Unit
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