An Investigation on the Human Thermal Comfort from a Glass Window

Khamporn, Nopparat; Chaiyapinunt, Somsak

doi:10.4186/ej.2014.18.1.25

Cited by 18 publications

(14 citation statements)

References 16 publications

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“…The uncertainty of the measured outside air temperature, inside glass surface temperature, blind temperature and operative temperature is about ±0.5 C for each. For neglecting errors due to angle factor and shading fraction, Khamporn and Chaiyapinunt [10] estimated the uncertainties for the mean radiant temperature calculated from Eq. (10) and evaluated from the measured operative temperature to be ±2.5% and ±3.5, respectively.…”

Section: Uncertainty Analysismentioning

confidence: 99%

“…To reduce this solar heat gain and maintain thermal comfort for the occupants, air conditioning systems are required. A considerable amount of research has been conducted on thermal performance of glass windows in terms of heat transmission and thermal comfort: Athienitis and Haghighat [1]; Gan [2]; Chaiyapinunt et al [3]; La Gennusa et al [4]; La Gennusa et al [5]; Singh et al [6]; Chaiyapinunt and Khamporn [7]; Dong et al [8]; Hwang and Shu [9] and Khamporn and Chaiyapinunt [10]. However, when a building is actually used, occupants often install venetian blinds as an indoor shading device to reduce glare and maintain privacy.…”

Section: Introductionmentioning

confidence: 99%

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Effect of installing a venetian blind to a glass window on human thermal comfort

Khamporn

Chaiyapinunt

2014

Building and Environment

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Section: Uncertainty Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of installing a venetian blind to a glass window on human thermal comfort

Khamporn

Chaiyapinunt

2014

Building and Environment

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“…The effect on the thermal comfort, of the solar radiation that crosses through surfaces of the walls in glass, for a person sitting nearby has been investigated by Cucumo et al [36], Khamporn and Chaiyapinunt [37] and Cannistraro [38], which obtained by tests in a test chamber, with the objective of evaluating Predicted Mean Vote (PMV) and predicted percentage of dissatisfied (PPD). They clearly demonstrate that the mean radiant temperature, PMV and PPD depends on the solar radiation transmitted through the glassed surface, and by the temperature of the surface glazed area.…”

Section: Problem Formulationmentioning

confidence: 99%

“…In literature in the field thermal comfort in presence of radiating surfaces, different formulas have been proposed for the calculation of the mean radiant temperature. The expression most used is provided by the equation Recent works on the thermal comfort in presence of radiating surfaces have been produced by Kamporn [36], and Cannistraro et al [37]. They show that local radiant mean temperature assumes different values in relation to the distance of the point from any radiating surfaces.…”

Section: Effects Of Punctual Refrigeration On Comfortmentioning

confidence: 99%

Indoor comfort in presence radiant exchanges with insolated glassed walls and local acclimatization to increase indoor comfort conditions

Cannistraro¹,

Trancossi²

2018

TI-IJES

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The years '60 have been the starting point on an important R&D activity on the technologies for increasing the indoor comfort conditions. This activity produced related standards, such as ISO7730 an important technological research on domotics and different sensors for controlling indoor acclimatization parameters (temperature, humidity, air speed, etc.) at room level. They produced automatic controls and home automation systems allow managing and control acclimatization at room level. These technical solutions still present difficulties in managing the comfort conditions in large open-space office environments. The thermal uniformity problems are accentuated by the presence of large glassed surfaces. Such architectural conditions generate an uneven thermal distribution because of solar radiation that generates some consequent levels of localized discomfort. It is then evident that an effective optimization of the comfort conditions is much more important when we consider that this architectural design is often used in offices and other working environments. Different shading solutions have been studied with limited success. Previous research activities have introduced a new physical parameter defined as "local mean radiant temperature" that allows a better evaluation of comfort conditions inside large open space environments. This intuition produces an effective local acclimatization system, which grants an effective localized control of comfort conditions in large environments with large glassed surfaces. After an effective analysis of different methods for evaluating the comfort conditions according to actual standards, it evaluates the difference and the influence of the distance from the radiating surface. In conclusion, an effective solution for improving the thermal distribution This plant is realized by two fundamental subsystems: a Wi-Fi sensing subsystem that senses airspeed and temperature and an active conditioning system made by active reversible Peltier cells. The sensing system pilots the active local acclimatization inside the "open-space" environment. In this way, it increases the comfort conditions and the air quality with remarkable energy saving with respect to any traditional airconditioning plant. The nature of the Peltier cells produces the same effect of a micro heat pump that produces localized and punctual HVAC. An effective increase in comfort conditions has been evaluated by means of the traditional parameters, such as PMV and PPD in different conditions of work.

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“…A number of studies have investigated indoor thermal comfort near glazing incorporating with solar radiation effects. Khamporn and Chaiyapinunt (2014), Chaiyapinunt et al (2005), and Singh et al (2008) evaluated thermal comfort near a window for evaluation of the performance of different glazing types and glazing films, and the results BUILD SIMUL https://doi.org/10.1007/s12273-020-0743-x showed suitable glazing type could lower overheating risk due to the solar radiation. Chaiyapinunt and Khamporn (2020) further discussed the thermal comfort with various distances from the window glazing considering the solar effect.…”

Section: Introductionmentioning

confidence: 99%

Thermal comfort in winter incorporating solar radiation effects at high altitudes and performance of improved passive solar design—Case of Lhasa

Huang

Kang

2020

Build. Simul.

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The solar incidence on an indoor environment and its occupants has significant impacts on indoor thermal comfort. It can bring favorable passive solar heating and can result in undesired overheating (even in winter). This problem becomes more critical for high altitudes with high intensity of solar irradiance, while received limited attention. In this study, we explored the specific overheating and rising thermal discomfort in winter in Lhasa as a typical location of a cold climate at high altitudes. First, we evaluated the thermal comfort incorporating solar radiation effect in winter by field measurements. Subsequently, we investigated local occupant adaptive responses (considering the impact of direct solar irradiance). This was followed by a simulation study of assessment of annual based thermal comfort and the effect on energy-saving potential by current solar adjustment. Finally, we discussed winter shading design for high altitudes for both solar shading and passive solar use at high altitudes, and evaluated thermal mass shading with solar louvers in terms of indoor environment control. The results reveal that considerable indoor overheating occurs during the whole winter season instead of summer in Lhasa, with over two-thirds of daytime beyond the comfort range. Further, various adaptive behaviors are adopted by occupants in response to overheating due to the solar radiation. Moreover, it is found that the energy-saving potential might be overestimated by 1.9 times with current window to wall ratio requirements in local design standards and building codes due to the thermal adaption by drawing curtains. The developed thermal mass shading is efficient in achieving an improved indoor thermal environment by reducing overheating time to an average of 62.2% during the winter and a corresponding increase of comfort time.

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An Investigation on the Human Thermal Comfort from a Glass Window

Cited by 18 publications

References 16 publications

Effect of installing a venetian blind to a glass window on human thermal comfort

Effect of installing a venetian blind to a glass window on human thermal comfort

Indoor comfort in presence radiant exchanges with insolated glassed walls and local acclimatization to increase indoor comfort conditions

Thermal comfort in winter incorporating solar radiation effects at high altitudes and performance of improved passive solar design—Case of Lhasa

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