Investigation of Air Distribution in Mosque Rooms with Different Angles of Supply and Inlet Velocity

The HVAC (heating, ventilation, and air conditioning) systems utilization has increased in the last decade. It conducts global warming which has an impact on the rising of global temperatures. An excellent air conditioning system will make the room comfortable conditions. This paper aims to investigate the mosque space with a cooling model of wall-mounted air conditioning and the difference in inlet angle and air inlet velocity. The room design was constructed using SolidWorks software. Air distribution observations were created using ANSYS Workbench simulation software. The use of a supply angle of 90° results in an even distribution of air with a low inlet velocity, whereas in conditions of a supply angle of 60° requires a higher inlet speed. Thus, the uniform air distribution is able to be realized by the proper configuration which results an appropriately room temperature and saves energy usage.

Effects of Supply Parameters of Stratum Ventilation on Energy Utilization Efficiency and Indoor Thermal Comfort: A Computational Approach

Stratum ventilation shows the significant potential on energy conservation and indoor thermal comfort under cooling applications. Yet, only limited researches focus on the thermal performance of stratum ventilation under heating condition. The heating and cooling operation characteristic of stratum ventilation is different due to the distinct airflow characteristics. Therefore, this paper investigated the parameters that affect energy utilization efficiency and indoor thermal comfort under heating condition served by stratum ventilation via CFD simulations approach. The supply air parameters included temperature, airflow rate, angle, and return air outlet positions. The evaluation indicators adopt ventilation effectiveness and effective draft temperature (EDT) for assessing the energy utilization efficiency and indoor thermal comfort served by stratum ventilation under heating condition. The results demonstrated that, under the heating mode of stratum ventilation, different effects on the thermal performance were made by the mentioned parameters. The ventilation effectiveness was higher when the air supply temperature is 26°C, airflow rate is 7 air change per hour (ACH), and the air supply angle is 45°. The EDT range of the occupied zone is closest to zero K when the air supply temperature is 28°C, airflow rate is 12 (ACH), and the air supply angle is 60°. The related conclusions obtained from this study provide the theoretical basis for the stratum ventilation design and promote its heating application.

Research on Desk Personalized Ventilation in Winter Based on CFD

The excellent desk personalized ventilation scheme is found in this paper by the way of comparing the four winter air supply schemes, basing on the numerical simulation software of CFD. We find that air supply quality and air supply angle are both the important factors to personalized ventilation individual comfort in winter. The air temperature and velocity surrounding the human body of the excellent desk personalized ventilation scheme are discussed. It comes to the conclusions that under simulated conditions the excellent desk personalized ventilation scheme can better satisfy the human body comfort on the surrounding air temperature and healthy than the traditional air conditioning, and it is easier to achieve energy saving too.

Numerical Simulation on Effects of Air Supply Angle and Air Supply Velocity to Indoor Thermal Environment of Wall Hanging Air-Conditioning

A wall hanging air-conditioning office was simulated on three different air supply angle and three different air supply velocity by the AIRPAK .Based on the velocity fields, temperature fields, PMV-PPD obtained, analysis indoor thermal comfort. The result shows obvious difference of air distribution and great effect of indoor thermal under different air supply angle and different air supply velocity. By comprehensive comparison, the best air supply condition is the one of 75° downward, 3.0m/s.

Thermal Comfort Study of Wall Hanging Air-Conditioning Office in Summer

Airpak was applied to numerically simulate the air distribution under the same air supply temperature ,different air supply velocity (3.6m/s、2.7m/s and 1.8m/s ) and air supply angle (+15°、-45° and-75°) , and evaluate thermal comfort by Comparative analysis velocity fields, temperature fields, PMV—PPD. The results show that different air supply velocity and air supply angle have a significant impact on indoor air distribution under the same air supply temperature. Air supply angle Plays a vital role in pattern and distribution of indoor flow field,air supply velocity mainly effect the magnitude of indoor velocity and temperature. Synthetically comparied, the model’s best supply parameters are supply velocity 2.7m/s and supply angle75°,which mean value of indoor PMV is-0.09, PPD is 8.5%.

Numerical Simulation of Energy Saving at Different Air Supply Angles in Air-Conditioned Room

The air-conditioned room in small space is studied by establishing the mathematical model of the air flow arrangement for energy saving. The energy saving effect is analyzed numerically at different angles under circumstance of the most common way of one-side up supply and down return. Our results show that if air supply angle is set at , the energy utilization coefficient is maximum value,and air condition reaches best energy-saving state. Our design method can be referenced valuably for the air exit design and regulating of air-conditioned room in real project.