The appropriate airflow rate for a nozzle in commercial aircraft cabins based on thermal comfort experiments

2017 ◽  
Vol 112 ◽  
pp. 132-143 ◽  
Author(s):  
Xiuyuan Du ◽  
Baizhan Li ◽  
Hong Liu ◽  
Yuxin Wu ◽  
Tengfei Cheng
Keyword(s):  
Thermal Comfort ◽  
Airflow Rate ◽  
Commercial Aircraft ◽  
Aircraft Cabins

Passenger thermal comfort and behavior: a field investigation in commercial aircraft cabins

Indoor Air ◽  
2016 ◽  
Vol 27 (1) ◽  
pp. 94-103 ◽  
Author(s):  
W. Cui ◽  
T. Wu ◽  
Q. Ouyang ◽  
Y. Zhu
Keyword(s):  
Thermal Comfort ◽  
Field Investigation ◽  
Commercial Aircraft ◽  
Aircraft Cabins ◽  
And Behavior

scholarly journals Characterization of endotoxin and 3-hydroxy fatty acid levels in air and settled dust from commercial aircraft cabins

Indoor Air ◽  
2003 ◽  
Vol 13 (2) ◽  
pp. 166-173 ◽  
Author(s):  
C. J. Hines ◽  
M. A. Waters ◽  
L. Larsson ◽  
M. R. Petersen ◽  
A. Saraf ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Hydroxy Fatty Acid ◽  
Commercial Aircraft ◽  
Aircraft Cabins ◽  
Settled Dust

Commercial Aircraft Cabins’ Ventilation Systems

2017 ◽  
Author(s):  
Essam E. Khalil ◽  
Ahmed Azzazi ◽  
Gamal M. ElHarriri ◽  
Taher AbouDeif
Keyword(s):  
Commercial Aircraft ◽  
Aircraft Cabins ◽  
Ventilation Systems

scholarly journals Thermal comfort assessment in civil aircraft cabins

2014 ◽  
Vol 27 (2) ◽  
pp. 210-216 ◽  
Author(s):  
Liping Pang ◽  
Yue Qin ◽  
Dong Liu ◽  
Meng Liu
Keyword(s):  
Thermal Comfort ◽  
Aircraft Cabins ◽  
Civil Aircraft

scholarly journals Application of Horizontal Confluents Jets in a School Virtual Chamber

2021 ◽  
Vol 246 ◽  
pp. 02005
Author(s):  
Eusébio Conceição ◽  
Mª Inês Conceição ◽  
João Gomes ◽  
Mª Manuela Lúcio ◽  
Hazim Awbi
Keyword(s):  
Air Quality ◽  
Thermal Comfort ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Exhaust System ◽  
Comfort Level ◽  
Experimental Chamber ◽  
Airflow Rate ◽  
Inlet System ◽  
Head Level

The study presented in this work is performed in a virtual chamber, similar to an existing experimental chamber, with dimensions of 4.50×2.55×2.50 m3. The chamber, occupied with twelve virtual manikins, is equipped with six tables, twelve chairs, one exhaust system and one inlet system, based in confluents jets system. In the exhaust system are considered six air ducts, located above the head level, connected to the ceiling area. The inlet system, based in four vertical ducts, with 0.15 m diameter, located on the corners of the chamber, are equipped with consecutive holes, that promotes horizontal jets near the wall. The results demonstrate that when the airflow rate increases the air quality number increases, the thermal comfort number decreases and the ADI increases slightly. The predicted percentage of dissatisfied index values show that the thermal comfort level is acceptable, the dioxide carbon concentration values show that the indoor air quality is near the acceptable value and the Draught Risk is acceptable.

Dry Environments: The Influence of Low Humidity on Comfort and Health

1987 ◽  
Vol 31 (10) ◽  
pp. 1101-1104
Author(s):  
Joseph E. Laviana ◽  
Frederick H. Rohles ◽  
Linda I. Hoffberg
Keyword(s):  
Relative Humidity ◽  
Contact Lenses ◽  
Thermal Response ◽  
Commercial Aircraft ◽  
Soft Contact ◽  
Aircraft Cabins ◽  
Soft Contact Lenses ◽  
Health Related ◽  
Low Humidity ◽  
Indoor Spaces

Individuals are routinely subjected to dry environments. These conditions may result from geographic areas, the heating of indoor spaces, or specialized settings (e.g. commercial aircraft cabins). This paper examines the affect of low humidity from two perspectives: comfort and health. Results indicate that the dry-bulb temperature is only 7.8 times more important than relative humidity (rh) in determining the subjective thermal response, and that rh has a greater role in determining how men feel than how women feel. Additionally, it was shown that a perceivable level of annoyance is experienced by both wearers and nonwearers of soft contact lenses at or below 30% rh, and this effect becomes most pronounced after four hours. Other findings indicated that the perception of varying odor intensity levels (e.g., cigarette smoke) is higher in dry environments; several studies are also reported showing the health related benefits of humidification.

scholarly journals On the improvement of thermal comfort in indoor spaces conditioned by split-type systems

2019 ◽  
Vol 111 ◽  
pp. 02052
Author(s):  
Silva Júnior Anastácio da ◽  
Cordeiro Mendonça Kátia ◽  
Vilain Rogério ◽  
Pereira Marcelo Luiz ◽  
Mendes Nathan
Keyword(s):  
Thermal Comfort ◽  
Low Cost ◽  
Type System ◽  
Type Systems ◽  
Cooling Capacity ◽  
Linear Regression Method ◽  
Airflow Rate ◽  
Set Point ◽  
Air Supply ◽  
Radiant Temperature

Conventional on/off-based control split-type appliances are widely used in classrooms and offices, in Brazil and in many other countries, due to their low cost and ease of installation. However, occupants often complain about thermal discomfort depending on their position within the conditioned space, especially in positions that are directly affected by the draft, since those equipment provide high cold air velocities as a result of their high cooling capacity relatively to their air supply area. In order to improve the indoor thermal comfort in spaces conditioned by this kind of system, a simplified empirical model for controlling both the supply airflow and the temperature set-point is proposed in this work. In view of that, the comfort conditions in an occupied classroom were experimentally evaluated according to ISO 7730 Standard, which defines the thermal satisfaction in occupied environments based on the PMV index. Specifically, the speed, temperature and relative humidity of the air and the mean radiant temperature of the room were measured at 8 positions within the air conditioned space, for the three original air flows (high, medium and low) of a 10.5-kW cooling capacity appliance and three set-point temperatures (23, 24 and 25 °C). The simplified model, correlating thermal comfort and the variables that could be directly controlled by the split-type system (airflow rate and temperature), was obtained by adjusting several curves from 72 measuring assemblies (8 measuring points, 3 set-point temperatures and 3 supply airflows). The correlation that best represents the distribution of thermal comfort throughout the conditioned environment was provided by the non-linear regression method of Levenberg-Marquardt.

scholarly journals Comparative Study of a Clean Technology Based on DSF Use in Occupied Buildings for Improving Comfort in Winter

2021 ◽  
Vol 3 (2) ◽  
pp. 311-334
Author(s):  
Eusébio Conceição ◽  
João Gomes ◽  
Maria Manuela Lúcio ◽  
Maria Inês Conceição ◽  
Hazim Awbi
Keyword(s):  
Air Quality ◽  
Comparative Study ◽  
Thermal Comfort ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Thermal Response ◽  
Clean Technology ◽  
Comfort Level ◽  
Airflow Rate ◽  
Winter Conditions

This paper presents a comparative study of a clean technology based on a DSF (double skin facade) used in winter conditions in the occupied buildings comfort improvement, namely the thermal comfort and air quality. The performance of a solar DSF system, the building’s thermal response, the internal thermal comfort and the internal air quality are evaluated. In this study, a DSF system, an air transport system and a HVAC (heating, ventilating and air conditioning) system based on mixing ventilation are used. The study considers a virtual chamber occupied by eight persons and equipped, in the outside environment, by three DSFs. A new horary pre-programming control methodology is developed and applied when the airflow rate is constant and the number of DSFs to operate is variable, when the airflow rate is variable and the number of DSFs to operate is constant and when the airflow rate is variable and the number of DSFs to operate is variable. This work uses a numerical model that simulates the integral building thermal behavior and an integral human thermal response. The internal air, provided by a mixing ventilating system, is warmed using the DSF system. The air temperature inside the DSF system and the virtual chamber, the thermal comfort level using the PMV index, the internal air quality using the carbon dioxide concentration and the uncomfortable hours are calculated for winter conditions. The results obtained show that the energy produced in the DSF, using solar radiation, guarantees acceptable thermal comfort conditions in the morning and in the afternoon. The indoor air quality obtained at the breathing level is acceptable. It is found that the airflow rate to be used is more decisive than the DSF operating methodology. However, when a solution is chosen that combines a ventilation rate with the number of DSF to operate, both variables throughout the day can obtain simultaneously better results for indoor air quality and thermal comfort according to the standards.

Sign in / Sign up

Export Citation Format

Share Document