scholarly journals Clarifying Optimum Setting Temperatures and Airflow Positions for Personal Air Conditioning System on Flight

2021 ◽  
Vol 18 (4(Suppl.)) ◽  
pp. 1431
Author(s):  
Yuna Matsumoto ◽  
Manami Kanamaru ◽  
Phan Xuan Tan ◽  
Eiji Kamioka
Keyword(s):  
Human Body ◽  
Air Conditioning ◽  
Air Travel ◽  
Fluid Simulation ◽  
The Body ◽  
Air Conditioning System ◽  
Operative Temperature ◽  
Body Experiences ◽  
Localized Heating ◽  
The Ideal

In recent years, the demand for air travel has increased and many people have traveled by plane. Most passengers, however, feel stressed due to the limited cabin space. In order to make these passengers more comfortable, a personal air-conditioning system for the entire chair is needed. This is because the human body experiences discomfort from localized heating or cooling, and thus, it is necessary to provide appropriate airflow to each part of the body. In this paper, a personal air-conditioning system, which consists of six vertically installed air-conditioning vents, will be proposed. To clarify the setting temperature of each vent, the airflow around the passenger and the operative temperature of each part of the body is investigated using fluid simulation. In the simulation, the ideal temperature for each part of the body is defined and compared with the operative temperature to verify how close both temperatures are, resulting in determining the ideal setting temperature. The simulation result shows, that most parts of the body reach their ideal temperatures. In addition, the optimum setting temperature and position of each air-conditioning vent, which contribute to maintaining the thermal comfort of the human body on the plane, is clarified.

Embodying the culture of achievement: Culture between illness and perfection is a ‘thin line’ – obtaining the ideal female body as an act of achievement

2021 ◽  
pp. 1354067X2110040
Author(s):  
Josefine Dilling ◽  
Anders Petersen
Keyword(s):  
Experimental Study ◽  
Human Body ◽  
Female Body ◽  
The Body ◽  
Thin Line ◽  
Complex Processes ◽  
The Individual ◽  
Different Levels ◽  
The Ideal ◽  
Body Ideals

In this article, we argue that certain behaviour connected to the attempt to attain contemporary female body ideals in Denmark can be understood as an act of achievement and, thus, as an embodiment of the culture of achievement, as it is characterised in Præstationssamfundet, written by the Danish sociologist Anders Petersen (2016) Hans Reitzels Forlag . Arguing from cultural psychological and sociological standpoints, this article examines how the human body functions as a mediational tool in different ways from which the individual communicates both moral and aesthetic sociocultural ideals and values. Complex processes of embodiment, we argue, can be described with different levels of internalisation, externalisation and materialisation, where the body functions as a central mediator. Analysing the findings from a qualitative experimental study on contemporary body ideals carried out by the Danish psychologists Josefine Dilling and Maja Trillingsgaard, this article seeks to anchor such theoretical claims in central empirical findings. The main conclusions from the study are used to structure the article and build arguments on how expectations and ideals expressed in an achievement society become embodied.

PS01.152: BODY TEMPERATURE IN THORACOSCOPIC ESOPHAGECTOMY AND AIR CONDITIONING SYSTEM OF OPERATION ROOM

2018 ◽  
Vol 31 (Supplement_1) ◽  
pp. 92-93
Author(s):  
Hisashi Usuki ◽  
Takayoshi Kishino ◽  
Masao Fujiwara ◽  
Keiichi Okano ◽  
Yasuyuki Suzuki
Keyword(s):  
Body Temperature ◽  
Air Conditioning ◽  
Conflicts Of Interest ◽  
The Body ◽  
Thoracoscopic Esophagectomy ◽  
Air Conditioning System ◽  
Operation Room ◽  
Starting Point ◽  
Group A ◽  
Group B

Abstract Background It is well known that the perioperative hypothermia often cause the perioperative complications. In this study the hypothermia during the thoracoscopic esophagectomy and the relationship between the hypothermia and the air conditioning system of operation room were evaluated. Methods The subject of this study was 58 patients with esophageal cancer. Fifty of them were male and the others were female and the age was 65.2 + -8.4 years old. Forty three of 58 patients underwent the surgery in the old operation rooms (Group A) and 15 of them underwent it in the operation rooms with new air condirioning system (Group B). The 18 measuring points were picked up for each patient, which were from 10 to 180 minutes after start. The body temperatures were measured every 10 minutes after starting anesthesia. The temperature difference comparing with the starting point of surgery and the frequency of hypothermic state were evaluated. ‘Hypothermic state’ was defined that the temperature reduce more than 0.3 centigrade in comparison with the temperature at the starting point of surgery in this study. Results < 1 > The body temperature reduced early 60 minutes and then rose slowly. It reduce 0.22 + -0.35 centigrade at 60 minutes after starting surgery in comparison with the starting point of surgery. < 2–1 > The temperature of the patients in Group A reduced 0.24 + -0.03 centigrade and 0.32 + -0.09 centigrade at 30 and 60 minutes after starting surgery. But, the temperature of the patients in Group B reduced only 0.05 + -0.01 centigrade at 30 minutes after starting surgery and the temperature recovered at 60 minutes. These differences were statistically significant. < 2–2 > The total measuring points were 774 points in Group A and 270 points in Group B. The hypothermic state was observed 353 measuring points (45.6%) in Group A, and only 8 points (3.0%) in Group B. This difference was statistically significant. Conclusion The new operation rooms, in which the temperature of the air flow for the patients and that for surgeons can be set separately, is useful for keeping the body temperature of the patients adequately. Disclosure All authors have declared no conflicts of interest.

Evaluation of membrane-based air pre-dehumidification for a capillary radiant air conditioning system

2020 ◽  
pp. 1420326X2096738
Author(s):  
Zan-She Wang ◽  
Fang-Ting Yin ◽  
Ran Li ◽  
Zhao-Lin Gu
Keyword(s):  
Moisture Content ◽  
Air Conditioning ◽  
Dew Point ◽  
Liquid Desiccant ◽  
Air Conditioning System ◽  
Point Temperature ◽  
Dew Point Temperature ◽  
Temperature Range ◽  
Libr Solution ◽  
The Ideal

The polyvinylidene fluoride hollow fibre membrane air dehumidification tests were carried out between the liquid desiccant solutions and the wet air. Three liquid desiccant solutions of LiBr solution (50%), LiCl solution (35%) and CaCl2 solution (40%) were tested under different wet air conditions. The results showed that all the membrane dehumidification processes were stable. The air moisture content in the outlet of the membrane was maintained as 6.5 g/kg (da)–8.2 g/kg (da) when the air moisture content in the inlet of the membrane was operated from 17.1 g/kg (da) to 32.4 g/kg (da). The dehumidification amount of LiBr solution (50%) and LiCl solution (35%) was more productive. On this basis, a membrane-based air pre-dehumidification process for the capillary radiant air conditioning system was built. Since the ideal dew point temperature range of the indoor air is below 14–17°C according to the cold supply water, all the air moisture content at the membrane outlet is much lower than that of the ideal dew point temperature range, which means non-condensing occurs in the capillary tube surface. The membrane-based air pre-dehumidification process can easily form an adaptive regulation process of humidity with the capillary radiant air conditioning system under different environmental parameters.

Small Molecules Originated from Tryptophan and their Clinical Significance as Potential Biomarkers

2021 ◽  
Vol 25 ◽  
Author(s):  
Katarzyna Kowalik ◽  
Natalia Miękus ◽  
Tomasz Bączek
Keyword(s):  
Human Body ◽  
Kynurenine Pathway ◽  
The Body ◽  
Medical Procedures ◽  
Current Trends ◽  
Tryptophan Metabolites ◽  
Patient Prognosis ◽  
Potential Biomarkers ◽  
The Ideal

Background: L-tryptophan is an essential amino acid, necessary for the human body to function. Its degradation occurs through two metabolic pathways. Approximately 95% of the L-tryptophan available in the body is converted via the kynurenine pathway, while the remainder is degraded via the serotonin pathway. Properly maintained balance between the concentrations of individual small molecular metabolites is extremely important to maintain homeostasis in the human body, and its disruption could lead to the development of numerous neurological, neurodegenerative, neoplastic, as well as cardiovascular diseases. Recent reports suggested that by controlling the levels of selected L-tryptophan metabolites (potential biomarkers), it is possible to diagnose numerous diseases, monitor their course and assess patient prognosis. Objective: The aim of this paper is to review the currently important clinical applications of selected biomarkers from the L-tryptophan metabolism pathways that would be helpful in early diagnosis, monitoring the course and treatment of serious diseases of affluence, which ultimately could improve the patients’ quality of life, as well as support targeted therapy of the aforementioned diseases. Conclusion: Since the biochemical biomarkers determination in body fluids presents the ideal minimally invasive tool in the patents’ diagnosis and prognostication, the topic is up-to-date and, importantly, emphasized the current trends and perspectives of application of analysis of selected L-tryptophan metabolites named kynurenine and serotonin-derived small compounds in the routine medical procedures.

scholarly journals CFD Study on Thermal Implication towards Human Body in Office Environment

2021 ◽  
Vol 85 (1) ◽  
pp. 125-134
Author(s):  
Ahmad Rasdan Ismail ◽  
Norfadzilah Jusoh ◽  
Nor Kamilah Makhtar ◽  
Nor Kamaliana Khamis ◽  
Raemy Md Zein ◽  
...  
Keyword(s):  
Air Conditioning ◽  
Work Productivity ◽  
Environmental Parameters ◽  
Thermal Conditions ◽  
Air Conditioning System ◽  
Operative Temperature ◽  
Office Environment ◽  
Computational Fluid Dynamics Simulations ◽  
Dynamics Simulations ◽  
Radiant Temperature

Temperatures are rising gradually around the world due to the issue of global warming. This condition also affects those who have to work for long hours. A comfortable work environment helps employees to increase work productivity. Thermal comfort is the occupant’s satisfaction with the surrounding thermal conditions. Therefore, the objective of this study is to evaluate the thermal environmental conditions of air conditioning through Computational Fluid Dynamics simulations. The distributions of environmental parameters such as air velocity, air temperature, radiant temperature, inside an o?ce room with air-conditioning are presented. Based on these distributions, spatial pro?les of Predicted Mean Vote Index (PMV) are obtained to illustrate thermal conditions intuitively. This study was conducted under controlled environment inside special laboratory. To achieve this model office environment has been built in an environmental chamber. The distribution of PMV indicates that operative temperature at the 23 oC shows that the PMV is comfortable. The value of PMV in operative temperature at 23 oC is 0.79 near the skin of an occupant. The research outputs provide useful information for designers of the air-conditioning system to build a comfortable indoor environment in the office environment.

A Novel Modeling Approach to Estimate Segmental and Intersegmental Ventilation and Heat Transport From a Walking Clothed Human Using Electric Circuit Analogy

2017 ◽  
Author(s):  
Nagham Ismail ◽  
Nesreen Ghaddar ◽  
Kamel Ghali
Keyword(s):  
Heat Transport ◽  
Human Body ◽  
Electric Circuit ◽  
Heat Losses ◽  
The Body ◽  
Effective Model ◽  
Sensible Heat ◽  
Body Experiences ◽  
Circuit Analogy ◽  
Relative Wind

When the clothed human body experiences relative wind due to walking and external wind, heat and vapor transfers from the body to the environment are enhanced by ventilation through clothing. The clothing ventilation is related to the clothing permeability, open and close apertures, relative wind, clothed limbs swinging motion as well as the inter-segmental ventilation that occurs at the interconnection between the clothed human trunk and arms. In this study, a computationally effective model is developed to estimate clothing ventilation based on the analogy between the air flow in the microclimate air layer and an electric circuit composed of resistance and inductance elements. The model takes into account the inter-connection between the segments for the clothed human upper part driven by difference of pressure in the microclimate air of the trunk and the upper arms. The estimation of the segmental ventilation, taking into account the inter-connection, allows the correction of the clothing dry resistances in a bio-heat model that will be used to predict the sensible heat losses of the clothed human.

ANALYSIS OF COMPETING VARIANTS OF AIR CONDITIONING SYSTEMS WITHOUT AIR EXTRACTION FROM ENGINES AT THE STAGE OF PASSENGER AIRCRAFT ONBOARD SYSTEMS CONCEPTUAL DESIGN

2019 ◽  
Vol 6 (3) ◽  
pp. 80-85
Author(s):  
Denis Igorevich Smagin ◽  
Konstantin Igorevich Starostin ◽  
Roman Sergeevich Savelyev ◽  
Anatoly Anatolyevich Satin ◽  
Anastasiya Romanovna Neveshkina ◽  
...  
Keyword(s):  
Conceptual Design ◽  
Air Conditioning ◽  
Research University ◽  
Cooling System ◽  
Fuel Efficiency ◽  
Air Cooling ◽  
Moscow Aviation Institute ◽  
Air Conditioning System ◽  
Low Efficiency ◽  
Air Conditioning Systems

One of the ways to achieve safety and comfort is to improve on-board air conditioning systems.The use of air cooling machine determines the air pressure high level at the point of selection from the aircraft engine compressor. Because of the aircraft operation in different modes and especially in the modes of small gas engines, deliberately high stages of selection have to be used for ensuring proper operation of the refrigeration machine in the modes of the aircraft small gas engines. Into force of this, most modes of aircraft operation have to throttle the pressure of the selected stage of selection, which, together with the low efficiency of the air cycle cooling system, makes the currently used air conditioning systems energy inefficient.A key feature of the architecture without air extraction from the main engines compressors is the use of electric drive compressors as a source of compressed air.A comparative analysis of competing variants of on-board air conditioning system without air extraction from engines for longrange aircraft projects was performed at the Moscow Aviation Institute (National Research University).The article deals with the main approaches to the decision-making process on the appearance of a promising aircraft on-board air conditioning system at the stage of its conceptual design and formulated the basic requirements for the structure of a complex criterion at different life cycle stages.The level of technical and technological risk, together with a larger installation weight, will require significant costs for development, testing, debugging and subsequent implementation, but at the same time on-board air conditioning system scheme without air extraction from the engines will achieve a significant increase in fuel efficiency at the level of the entire aircraft.

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