analysis of air flow distribution and thermal comfort in a

Thermal comfort

Thermal comfort is the condition of mind that expresses satisfaction with the thermal environment and is assessed by subjective evaluation (ANSI/ASHRAE Standard 55) The human body can be viewed as a heat engine where food is the input energy The human body will release excess heat into the environment so the body can continue to operate

Thermal Comfort Analysis of a Ship Air

The focus of this work is to simulate and optimize thermal comfort in a ship air-conditioning system by evaluating the performance of different types of air supply outlets Thermal comfort analyses were performed in Solidworks Flow Simulation software by changing the number type and position of air supply outlets and the comfort was optimized by evaluating the values of temperature velocity

Air flow simulation of HVAC system in compartment of a

Aug 01 2017So far many studies have been carried out to simulate the air flow distribution and assess the thermal comfort conditions in different enclosed spaces For instance Okland did a study on metro stations and carriages in London They investigated the thermal comfort conditions as well as the air particulates in the studied systems

Ventilator air flow measurement in new houses: The effect

Ventilator air flow measurement in new houses The effect of ventilator location on thermal comfort and air flow distribution in new domestic houses in the UK M M Eftekhari Department of Civil Building Engineering Loughborough University Leicestershire LE11 3TU UK

Optimization of Energy Consumption in Net

Nada et al investigated thermal comfort temperature distribution and air flow pattern using CFD in a theater building which yielded optimal performance temperature proper temperature and velocity of inlet air Orosa and Oliveira compared the adaptive models and PMV and proposed a new method for thermal comfort

THE BASICS OF ROOM AIR DISTRIBUTION

Mar 22 2011• Standard 55 says thermal comfort can be achieved with 0 fpm air motion • Uniform air temperatures indicate good mixing when loads are present • With conventional (well-mixed) systems room air speed is driven primarily by room loads when air supply is below 0 9 CFM/sq ft and air diffusion is adequate per ASHRAE sponsored research

Simulation of Thermal Comfort of a Residential House

effects of air flow due to wind and the most importantly the occupant's comfort To assess the thermal comfort it is necessary to analyse air velocity temperature the distribution and relative humidity of the air in the interior space of the building Standards that may be used to evaluate thermal comfort are widely available and

Under

2 Best air stratification achieved at 1 m/s of supply air velocity 3 The above supply condition proved that thermal comfort and air distribution are improved 4 The UFAD System was operated incorrectly so to insure the above benefits the operators need to be trained and closely managed 28

Numerical Simulation of the Air Flow and Thermal Comfort

Thermal Comfort Mol (TCM) CFD decabin airflow FIALA-Manikin-Model 1 Introduction Thermal comfort and the well-being of passengers in aircraft cabin importare criteria for airlines to purchase a specific aircraft The thermal comfort of passengers in par-ticular is influenced by the air flow the temperature distribution and the thermal radi-

Analysis of Displacement Ventilation for Hospital Patient

Jan 01 2019Effect of the location of stratified layer on the thermal comfort of occupants is discussed in the next section Thermal Comfort Figure 4 shows the resulting distribution of the PMV the thermal comfort index at the 4 feet (1 2 m) height from the floor Ideally the PMV levels should be at thermal neutral level - PMV values close to 0 0

Numerical approximation of air flow temperature

Jul 01 2020Thermal comfort is associated to air flow and temperature distributions in the ventilation system or air conditioning space In this work the principal goal is the analyzing of air flow thermal comfort and the distribution of temperature in the chamber using a commercial computational fluid dynamics package (ANSYS CFX 15)

Basics of Room Air Distribution

Mar 22 2011• When air distribution is designed with a minimum ADPI of 80% the probability of vertical temperature stratification or horizontal temperature non-uniformity is low and conformance with ASHRAE Standard 55 (Thermal Comfort) requirements is high • ADPI does not apply to heating situations or ventilation-related mixing

Investigating Occupancy

Therefore the paper proposes a method to investigate an occupancy-driven HVAC control system that is based on thermal comfort analysis Computational fluid dynamics (CFD) was used to evaluate thermal comfort through modeling of the indoor air distribution and flow

Investigating Occupancy

Therefore the paper proposes a method to investigate an occupancy-driven HVAC control system that is based on thermal comfort analysis Computational fluid dynamics (CFD) was used to evaluate thermal comfort through modeling of the indoor air distribution and flow

Thermal Comfort: Designing for People

Thermal comfort is a condition of mind that ex-presses satisfaction with the thermal environ-ment Due to its subjectivity thermal comfort is different for every individual It is maintained when the heat generated by the human metabolism is allowed to dissipate at a rate that maintains thermal equilibrium in the body Any heat gain or loss

Calculation methods for air supply design in industrial

1 TARGET LEVELS FOR AIR DISTRIBUTION DESIGN 1 1 Introduction The objectives of air distribution systems for warm air heating ventilating and air-conditioning are to create the proper thermal environment conditions in the occupied zone (combination of temperature humidity and air movement) and to control vapor and air bom particle

Analysis of Displacement Ventilation for Hospital Patient

Jan 01 2019Effect of the location of stratified layer on the thermal comfort of occupants is discussed in the next section Thermal Comfort Figure 4 shows the resulting distribution of the PMV the thermal comfort index at the 4 feet (1 2 m) height from the floor Ideally the PMV levels should be at thermal neutral level - PMV values close to 0 0

Comfort Analysis

Comfort Analysis DesignBuilder EnergyPlus simulations can generate extensive data on environmental conditions within the building and resultant occupant comfort levels The following comfort-related output is available: Internal air temperature - the calculated average temperature of the air

Underfloor Air Distribution

The geometry consists of a room with an underfloor air distribution (UFAD) ventilation system The heat sources used are four human simulators and six ceiling lights Cool air is fed to the room through the inlets on the floor while the humans and the lamps heat the surrounding air

The Dynamic Thermal Comfort Index Analysis under the Air

[7] found that the decreased thermal comfort of head is proportional to the cooling capacity of local gas while the optical thermal comfort of head appears at a certain air velocity Xia [8] and other studies have found that the wind speed of achieving thermal comfort is lower in the steady flow of high intensity than that in low intensity

Thermal comfort in buildings

"An analysis of 24 studies on the relationship between temperature and performance indicated a 10% reduction in performance at both 30C and 15C compared with a baseline between 21C and 23C – demonstrating the impact thermal comfort can have on office occupants

Air Flow Control in Buildings

Oct 15 2007Introduction It has long been recognised that the control of air flow is a crucial and intrinsic part of heat and moisture control in modern building enclosures [Wilson 1963 Garden 1965] ] That this statement is true for all climates has been a more recently developed awareness [Lstiburek 1994] A large fraction of a modern well-insulated building's space conditioning energy load is due to

Design Options for HVAC Distribution Systems

3 The success of a building depends on the ability to provide thermal comfort with the least operating costs (maintenance energy or replacement) This depends on the HVAC system design equipment and controls There are several choices for air distribution each satisfying the HVAC objectives with different degrees of success

Vehicle Applications

SUV and MPV vehicles provide additional challenges for occupant comfort With a larger cabin size and additional passengers these vehicles require increased thermal capacity and air flow volume and distribution In some applications providing both front and rear modules delivers the best solution

Thermal Comfort Analysis of a Ship Air

Thermal Comfort Analysis of a Ship Air-Conditioning System Using Solidworks Flow Simulation Abstract: The focus of this work is to simulate and optimize thermal comfort in a ship air-conditioning system by evaluating the performance of different types of air supply outlets

Numerical Studies on the Effect of Cooling Vent Setting

Also the presence of passengers altered the flow and temperature distributions in the cabin considerably The different vent angles also had considerable impact on the air flow pattern and temperature distribution in the cabin affecting the sensation of thermal comfort by the passengers