Synergetic Effect between Lighting Efficiency Enhancement and Building Energy Reduction Using Alternative Thermal Operating System of Indoor LED Lighting

Ahn, Byung Lip; Park, Ji Woo; Yoo, Seung‐Hwan; Kim, Jonghun; Jeong, Hakgeun; Leigh, Seung Bok; Jang, Cheol Yong

doi:10.3390/en8088736

Cited by 12 publications

(9 citation statements)

References 23 publications

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“…Occupant schedules and device usage, light heating, and outer conditions were entered in the same conditions, as shown in Figure A1 and Table A1 [31]. Analysis of monthly energy demand shows a difference occurs in the winter, which confirms that more than about a two times heating energy demand difference occurs in January and December that have the lowest average temperature.…”

Section: Predicted Energy Demandmentioning

confidence: 86%

Indoor Thermal Environment of Temporary Mobile Energy Shelter Houses (MeSHs) in South Korea

Kim¹,

Lee²,

Ahn

et al. 2015

Energies

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Temporary housing must be developed to support the long-term residence needs of disaster victims. The present study assesses a temporary housing unit, the so-called Mobile Energy Shelter House (MeSH), incorporating the "Korean Dwelling Insulation Standard" in order to reduce energy usage for cooling and heating. To assess energy performance, the characteristics of the indoor thermal environment were measured during the winter and summer seasons. In summer, at maximum insolation, the outdoor temperature was 37.6 °C and the indoor temperature of the MeSH ranged from 18 to 24 °C when the cooling system was not used. Conversely, during winter, the average outdoor temperature was −11.3 °C and the indoor temperature ranged from 16.09 to 20.63 °C when a temperature-controlled floor-heating was installed. Furthermore, the Predicted Mean Vote (PMV) was adopted to determine whether the ISO 7730 comfort criterion (i.e., PMV range from −0.5 to +0.5) was achieved. Based on the calculations presented here, PMV in summer ranged from −1.21 to +1.07 and that in winter ranged from −0.08 to −0.85, suggesting that the thermal environment is not always comfortable for occupants in either summer or winter. Nevertheless, the ISO comfort criterion can be achieved through varying OPEN ACCESSEnergies 2015, 10 11140 air velocity in summer and changing clothing characteristics in winter. A comparison between yearly energy demand of existing characteristic temporary housing (Shelter House) and the MeSH modules used in this study was performed. The simulation results show a 60% difference in energy demand between MeSH and existing temporary housing shelter houses.

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Section: Predicted Energy Demandmentioning

confidence: 86%

Indoor Thermal Environment of Temporary Mobile Energy Shelter Houses (MeSHs) in South Korea

Kim¹,

Lee²,

Ahn

et al. 2015

Energies

Self Cite

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“…The increase of temperature T j causes a drop in the value of the emitted light stream Φ, a change in the dominant wave length, as well as a decrease in the LED light source lifetime. Exceeding the maximum junction temperature T j declared by the producers may irreversibly damage a semi-conductive light source [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of the Factors Influencing Junction Temperature of LED Panel Sources

et al. 2019

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Limiting junction temperature T j and maintaining its low value is crucial for the lifetime and reliability of semi-conductive light sources. Obtaining the lowest possible temperature of T j is especially important in the case of LED panels, where in a short distance there are many light sources installed, between which there occurs mutual thermal coupling. The article presents results of simulation studies connected with the influence of construction and ambient factors that influence the value of junction temperature of exemplary LED panel sources. The influence of radiator's construction, printed circuit boards, as well as the influence of ambient factors, such as ambient temperature T a and air flow velocity v were subjected to the analysis. Numerical calculations were done in the FloEFD software of the Mentor Graphics company, which is based on computational fluid dynamics (CFD). For construction of the LED thermal panel model the optical efficiency η o and real thermal resistance Rth j-c were determined in a laboratory for the applied light sources.

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“…According to the latest research, limiting the Tj junction temperature is of key importance to the life of light-emitting diodes [34]. Exceeding the maximum Tj junction temperature set by producers can irreversibly damage a LED [35,36]. For each optical system designer, knowing the luminance level and luminance distribution (including its gradient) on the light source surface is critical regardless of the type of light source used.…”

Section: Introductionmentioning

confidence: 99%

Research on Luminance Distributions of Chip-On-Board Light-Emitting Diodes

Czyżewski

2019

Crystals

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Chip-On-Board Light-Emitting Diodes (COB LED) are increasingly more common. Their development in recent years has directly contributed to increasing the power of LED sources, whilst simultaneously increasing the luminous flux from the entire COB. Consequently, it has led to new developments in some applications. Information regarding the size of the light source luminous surface and luminance distribution on its surface is critical for a designer whilst designing optical systems. The purpose of this conducted research was to establish to what extent luminance distribution is even on the examined COB LEDs. In order to verify luminance distributions on an LED surface, direct measurements with a matrix luminance measuring device were made. As a result of the research, it has been observed that luminance distribution is not even, and in many cases luminance maximum does not fall in the geometric center of the luminous surface, which was initially expected. So, it has been concluded that while designing optical systems for COB LEDs, irregular luminance distribution on their surface needs to be considered.

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Synergetic Effect between Lighting Efficiency Enhancement and Building Energy Reduction Using Alternative Thermal Operating System of Indoor LED Lighting

Cited by 12 publications

References 23 publications

Indoor Thermal Environment of Temporary Mobile Energy Shelter Houses (MeSHs) in South Korea

Indoor Thermal Environment of Temporary Mobile Energy Shelter Houses (MeSHs) in South Korea

Thermal Analysis of the Factors Influencing Junction Temperature of LED Panel Sources

Research on Luminance Distributions of Chip-On-Board Light-Emitting Diodes

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