389 research outputs found
PARAMETRIC ANALYSIS ON COOLING SET POINT TEMPERATURE IN RESIDENTIAL APARTMENTS IN BEIRUT CITY
No full textDr. Nesreene Ghaddar, Professor: Advisor/Committee Chairperson
Department of Mechanical Engineering
Dr. Kamel Ghali, Professor: Co-Advisor/Member of Committee
Department of Mechanical Engineering
Dr. Ghassan Chehab: Member of Committee
Department of Civil and Environmental EngineeringThis study examines the potential impact of different configurations of building envelope material including external walls and windows on the final cooling energy consumption in a typical residential apartment in Beirut city that uses conventional DX split units in living room and bedroom zones using HAP software. MED-ENEC study is used to benchmark the Business as Usual (BAU) construction scenario of a case study apartment simulated in HAP that uses single walls and single glazing for windows. After the HAP (BAU) model is validated with MED-ENEC at 78 kWh/m2.year, five different scenarios that include different envelope configurations are simulated to assess possible energy savings, cost savings from EDL and generator subscription, in addition to CO2 emissions reduction
sj-pdf-1-gsj-10.1177_21925682211049167 – Supplemental Material for Effect of Phase Change Material Cooling Vests on Body Thermoregulation and Thermal Comfort of Patients With Paraplegia: A Human Subject Experimental Study
No full textSupplemental Material, sj-pdf-1-gsj-10.1177_21925682211049167 for Effect of Phase Change Material Cooling Vests on Body Thermoregulation and Thermal Comfort of Patients With Paraplegia: A Human Subject Experimental Study by Charbel K. Moussalem, Farah Mneimneh, Rana Sarieddine, Shadi Bsat, Mohamad N. El Houshiemy, Georges B. Minassian, Nesreen Ghaddar, Kamel Ghali and Ibrahim Omeis in Global Spine Journal</p
sj-tif-3-gsj-10.1177_21925682211049167 – Supplemental Material for Effect of Phase Change Material Cooling Vests on Body Thermoregulation and Thermal Comfort of Patients With Paraplegia: A Human Subject Experimental Study
No full textSupplemental Material, sj-tif-3-gsj-10.1177_21925682211049167 for Effect of Phase Change Material Cooling Vests on Body Thermoregulation and Thermal Comfort of Patients With Paraplegia: A Human Subject Experimental Study by Charbel K. Moussalem, Farah Mneimneh, Rana Sarieddine, Shadi Bsat, Mohamad N. El Houshiemy, Georges B. Minassian, Nesreen Ghaddar, Kamel Ghali and Ibrahim Omeis in Global Spine Journal</p
sj-tif-2-gsj-10.1177_21925682211049167 – Supplemental Material for Effect of Phase Change Material Cooling Vests on Body Thermoregulation and Thermal Comfort of Patients With Paraplegia: A Human Subject Experimental Study
No full textSupplemental Material, sj-tif-2-gsj-10.1177_21925682211049167 for Effect of Phase Change Material Cooling Vests on Body Thermoregulation and Thermal Comfort of Patients With Paraplegia: A Human Subject Experimental Study by Charbel K. Moussalem, Farah Mneimneh, Rana Sarieddine, Shadi Bsat, Mohamad N. El Houshiemy, Georges B. Minassian, Nesreen Ghaddar, Kamel Ghali and Ibrahim Omeis in Global Spine Journal</p
sj-tif-1-gsj-10.1177_21925682211049167 – Supplemental Material for Effect of Phase Change Material Cooling Vests on Body Thermoregulation and Thermal Comfort of Patients With Paraplegia: A Human Subject Experimental Study
No full textSupplemental Material, sj-tif-1-gsj-10.1177_21925682211049167 for Effect of Phase Change Material Cooling Vests on Body Thermoregulation and Thermal Comfort of Patients With Paraplegia: A Human Subject Experimental Study by Charbel K. Moussalem, Farah Mneimneh, Rana Sarieddine, Shadi Bsat, Mohamad N. El Houshiemy, Georges B. Minassian, Nesreen Ghaddar, Kamel Ghali and Ibrahim Omeis in Global Spine Journal</p
Modulated air layer heat amd moisture transport by ventilation and diffusion from clothing with open aperture
No full textA two-dimensional model is developed for the modulated internal airflow, due to walking, in the gap between clothing and skin surface in the presence of clothing apertures. The normal airflow renewing the air layer through the fabric is modeled using the Ghali et al. three-node fabric ventilation model with corrected heat and moisture transport coefficients within the fabric voids to include the diffusion-dominated transport processes in the fabric at low normal flow rates that occur near the open aperture. The parallel flow is induced by a periodic pressure difference between environmental pressure at the aperture of the clothing system and trapped air layer pressure. The parallel flow in the trapped air layer is assumed to be locally governed by the Womersley solution of time-periodic laminar flow in a plane channel. The two-dimensional (2D) model that uses, in the parallel direction, the Womersley flow of the trapped air layer has predicted significantly lower flow rates than a model based on an inertia-free quasi-steady Poisueille flow model (valid only at low ventilation frequencies). In addition, the model predicted lower sensible and latent heat losses from the sweating skin in the presence of open apertures in the clothing system. The percentage drop in total heat loss due to open aperture is 7.52percent, and 2.63percent, at ventilation frequencies of 25, and 35 revolution per minute, respectively. The reported results showed that under walking conditions, a permeable clothing system with an open aperture reduced heat loss from the skin when compared to a normal ventilation model (closed aperture). These results were consistent with previously published empirical data of Lotens and Danielsson on air layer resistance for open and closed apertures in high air permeable fabrics. Copyright © 2005 by ASME.ASTM, 1996, D73796 ASTM; DANIELSSON U, 1993, THESIS ROYAL I TECHN; FARNWORTH B, 1986, TEXT RES J, V56, P653, DOI 10.1177-004051758605601101; GAGGE AP, 1986, ASHRAE T B, V2; Ghaddar N, 2003, INT J THERM SCI, V42, P605, DOI 10.1016-S1290-0729(03)00026-7; Ghali K, 2002, J HEAT TRANS-T ASME, V124, P530, DOI 10.1115-1.1471524; Ghali K, 2002, INT J HEAT MASS TRAN, V45, P3703, DOI 10.1016-S0017-9310(02)00088-1; GHALI K, 2004, P INT C THERM ENG TH; Ghali K, 2002, J POROUS MEDIA, V5, P17; HAVENITH G, 1990, ERGONOMICS, V33, P67, DOI 10.1080-00140139008927094; HAVENITH G, 1990, ERGONOMICS, V33, P989, DOI 10.1080-00140139008925308; HOLMAN JP, 1997, HEAT TRANSFER, P488; Hyland R.W., 1983, ASHRAE T, V89, P500; JONES BW, 1993, ASHRAE T 1, V98, P189; JONES BW, 1990, P INT C ENV ERG AUST, P66; JONES BW, 1985, P CLIMA 2000 WORLD C, V4, P1; LAMOREUX LW, 1971, B PROSTHET RES, P3; Li Y, 1998, TEXT RES J, V68, P389, DOI 10.1177-004051759806800601; LOTENS W, 1993, THESIS TNO I PERCEPT, P34; McCullough EA, 1989, ASHRAE T, V95, P316; Morton W.E., 1975, PHYS PROPERTIES TEXT; Straatman AG, 2002, PHYS FLUIDS, V14, P1938, DOI 10.1063-1.1476673; WOMERSLEY JR, 1955, PHILOS MAG, V46, P199; WOMERSLEY JR, 1957, 56614 TR WADC AER RE79
Ghali Amin Oral History
No full textGalal Amin was an economics professor the American University in Cairo from the late 1970s through the early 2000s, in addition to being a renowned Egyptian public intellectual, author, and columnist. He describes his father, a prominent academic, and outlines his own early education and life as a graduate student in London, and early career as an economist in Kuwait. He mentions early teaching stints at AUC starting in 1967, contrasting the social class of students then with those in later years, and tells how he came permanently to AUC later in the 1970s. Amin briefly outlines changes in the Economics department over the years, and offers some commentary on AUC students (specifically changes in academic quality over time). He also speaks about the university’s relationship with Egyptian politics and government, including an anecdote about an AUC committee he served on after the 1973 war. His research interests and writings are also covered
Letter 25 from Waguih Ghali to Diana Athill on November 24, 1964
No full textLetter, 3 pagesPersonal names mentioned in the letter: Brian Moore (author of "An Answer from Limbo"); Herbert Zander; Edda; Kurt; Rolf; Agatha Christie; Detective Hercule Poirot; Fyodor Dostoevsk
Convection and ventilation in fabric layers
No full text[No abstract available]Acheson D J, 1990, ELEMENTARY FLUID DYN; American Society for Testing and Materials, 1983, D73775 ASTM; AMIRI A, 1994, INT J HEAT MASS TRAN, V37, P939, DOI 10.1016-0017-9310(94)90219-4; Amiri A, 1998, INT J HEAT MASS TRAN, V41, P4259, DOI 10.1016-S0017-9310(98)00120-3; [Anonymous], 1997, ASHRAE HDB; DANIELSSON U, 1993, THESIS ROYAL I TECHN; Fanger PO, 1982, THERMAL COMFORT ANAL, P156; FARNWORTH B, 1986, TEXT RES J, V56, P653, DOI 10.1177-004051758605601101; FONSECA GF, 1965, TEXT RES J, V35, P95, DOI 10.1177-004051756503500201; FOURT L, 1971, CLOTHING COMFORT FUN; Ghaddar N, 2005, INT J HEAT MASS TRAN, V48, P3151, DOI 10.1016-j.ijheatmasstransfer.2005.03.001; GHADDAR N, 2005, P ASME 2005 SUMM HEA; Ghaddar N, 2005, J HEAT TRANS-T ASME, V127, P287, DOI 10.1115-1.1857949; Ghaddar N, 2003, INT J THERM SCI, V42, P605, DOI 10.1016-S1290-0729(03)00026-7; Ghali K, 2002, J HEAT TRANS-T ASME, V124, P530, DOI 10.1115-1.1471524; GHALI K, 2004, P 1 INT C THERM ENG; Ghali K, 2002, INT J HEAT MASS TRAN, V45, P3703, DOI 10.1016-S0017-9310(02)00088-1; Ghali K, 2002, J POROUS MEDIA, V5, P17; HARTER KL, 1981, TEXT RES J, V51, P345, DOI 10.1177-004051758105100506; HAVENITH G, 1990, ERGONOMICS, V33, P67, DOI 10.1080-00140139008927094; HAVENITH G, 1990, ERGONOMICS, V33, P989, DOI 10.1080-00140139008925308; HONG S, 1992, THESIS KANSAS STATE; JONES BW, 1992, ASHRAE TRAN, V98, P189; JONES BW, 1990, P INT C ENV ERG AUST, P66; JONES BW, 1985, P CLIMA 2000 WORLD C, V4, P1; Kerslake D.M., 1972, STRESS HOT ENV; Kuznetsov AV, 1998, TRANSPORT PHENOMENA IN POROUS MEDIA, P103, DOI 10.1016-B978-008042843-7-50005-2; Kuznetsov AV, 1997, INT J HEAT MASS TRAN, V40, P1001, DOI 10.1016-0017-9310(96)00179-2; KUZNETSOV AV, 1993, INT J HEAT MASS TRAN, V37, P3030; LAMOREUX LW, 1971, B PROSTHET RES, P3; Lee DY, 1999, INT J HEAT MASS TRAN, V42, P423, DOI 10.1016-S0017-9310(98)00185-9; LI Y, 1997, THESIS KANSAS STATE; Lotens W, 1988, ENV ERGONOMICS, P162; Lotens WA, 1993, THESIS TNO I PERCEPT; McCullogh E., 1985, ASHRAE T, V91, P29; McCullough EA, 1989, ASHRAE T, V95, P316; MINCOWYCZ WJ, 1999, INT J HEAT MASS TRAN, V42, P3373; Morris G. J., 1953, J TEXT I, V44, P449; Morton W.E., 1975, PHYS PROPERTIES TEXT; NIELSEN R, 1985, ERGONOMICS, V28, P1617, DOI 10.1080-00140138508963299; NISHI Y, 1970, ASHRAE T, V75, P137; REES WH, 1941, J TEXT I, V32, P149; Straatman AG, 2002, PHYS FLUIDS, V14, P1938, DOI 10.1063-1.1476673; Vafai K., 1990, ASME, V112, P690; VOKAC Z, 1973, TEXT RES J, V42, P474; Womersley J. R., 1957, ELASTIC TUBE THEORY, P56; Woodcock A.H, 1962, TEXT RES J, V32, P628, DOI 10.1177-00405175620320080246
Use of steady and intermittent personalized ventilation in indoor environments: Thermal comfort and Indoor air quality
No full textKamel Ghali; Nesreene Ghaddar; Fadl Moukalled; Fouad Azizi; Walid Chakroun; Arsen MelikovThe wellbeing and productivity of occupants in indoor spaces are correlated to their satisfaction with their thermal environment and their breathable air quality. This is highly dependent on the installation of carefully designed and energy-efficient air distribution systems such as personalized ventilation. These systems are individual devices consisting of a ducting network, which outlet delivers conditioned clean fresh air towards the occupant. As the issuing jet is adjustable in flow rate, direction and temperature, personalized ventilators respond to each occupant’s thermal preferences while improving the inhaled air quality compared to standalone total volume ventilation. Research on personalized ventilation has investigated its performance under steady state conditions. In other words, its adjustable operating conditions were constant over prolonged periods of time.
The first part of this work integrates for the first time, the concept of personalized ventilation with dynamic cooling, known to enhance comfort in warm indoor conditions. This is done by supplying the personalized flow rate in a time-dependent sinusoidal profile that fluctuates between a minimum and a maximum at frequencies of 0.3-1 Hz. The occupant is hence given additional freedom to adjust the jet frequency to their liking or revert to steady supply. This device is denoted as intermittent personalized ventilation. This work studies through experimentally validated CFD models, the performance of intermittent personalized ventilation in a space equipped with typical mixing ventilation and another equipped with a chilled ceiling, in enhancing occupants’ thermal comfort. Breathable air quality will also be assessed, and possible energy savings evaluated in comparison with a steady system. It was found that intermittent personalized ventilators enhanced thermal comfort especially in warm indoor conditions (26 C) with increasing frequency. It did not perform well in neutral conditions (24 C). Moreover, due to increased jet turbulence, it provided lower, but nonetheless satisfactory breathable air quality compared to steady personalized ventilation. Energy savings of 16% and 8% were achieved in the case of mixing ventilation and chilled ceiling.
Personalized ventilation has always been viewed as a means to improve indoor quality for the person using it by reducing exposure to gaseous or particulate matter pollutants. However, in the presence of particle emissions, personalized ventilation can contribute to particle deposition on occupants’ clothing, which can act as subsequent sources if triggered by occupants’ physical activities. Hence, personalized ventilation can contribute to second-hand clothing-mediated exposures. This work also investigates through experimentally validated CFD models the effect of different air terminal devices in reducing inhalation exposure while contributing to second-hand clothing exposure. Results showed that a computer mounted panel showed the best performance as it simultaneously decreased all types of exposure. Vertical desk grills decreased inhalation exposure while having negligible effect on second-hand exposure. Round movable panels decreased inhalation exposure but significantly increased clothing mediated exposures
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