Tuesday, January 26, 2016: 11:15 AM-12:45 PM
Fundamentals and Applications
Chair:
Ann Peratt, PKMR Engineers
This session covers five papers that cover building envelope systems. Topics covered include insulation performance and installation, thermal resistance calculations, and drapery used for shading. The attendee will learn about insulation applications as well as some of the latest research regarding shading.
2 In-Situ Measurement of Building Thermal Resistance with a Plane Heater (OR-16-C053)
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Yue Zou, Ph.D., P.E., Donghua University
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Haigang Yu, Donghua University
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In this paper, a new methodology for the field measurement of thermal resistance of building envelope is proposed. A plane heater such as electric blanket is applied to heat one side of the test wall and heat flux transducers are fixed on the other side of wall to measure the heat flux through the measurement section. This could reduce the equipment size significantly and make the installation more easily compared to the traditional hot-box method but still can create enough temperature difference and one-direction heat flux to calculate the thermal resistance of the wall in a relatively short period.
3 Thermal Insulation Performances of Various Opaque Building Envelopes Considering Thermal Bridges (OR-16-C054)
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Jin-Hee Song, Ewha Womans University
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Seung-Yeong Song, Ph.D., Ewha Womans University
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Jae-han Lim, Ph.D., Ewha Womans University
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Min-Ju Park, Civil & Building R&D group, R&D division, Hyundai engineering and construction co,. LTD
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Heat losses and gains through opaque building envelopes (such as walls, roofs and floors) significantly affect the overall energy consumption of buildings. To reduce energy consumption of buildings, it is important to ensure that building envelopes exhibit excellent thermal insulation performance. However, the actual insulation performance of building envelopes varies depending on components and construction methods even if the same insulations of equal thickness are used. Therefore, this study aims to evaluate thermal insulation performances of various opaque building envelopes considering thermal bridges and to discuss methods of reducing thermal bridges.
4 Off-Normal Solar-Optical Performance of Pleated Drapery: Simulation Versus Measurement (OR-16-C055)
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Michael Collins, Ph.D., P.E., University of Waterloo
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Ned Huang, University of Waterloo
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John Wright, Ph.D., P.E., University of Waterloo
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In recent years, significant advances have been made in modeling fenestration with shading attachments. Most shading devices have great potential for reducing both peak building cooling load and annual energy consumption through the control of solar gains, and the ability to quantify their impact is important. As part of an ASHRAE sponsored research project, several new models were developed for various types of shading devices. One of the most complex of these was the pleated drapery model. This model used off-normal solar-optical fabric properties to predict the off-normal solar-optical properties of the pleated drapery. In doing so, the model assumed that the system could be represented as a series of uniformly arranged rectangular pleats. The presented work aims to validate model performance. A Broad-Area Illumination Integrating Sphere (BAI-IS) was used to perform measurements on a pleated drape sample. Three pleated drape samples composed of fabrics with different transmittance and reflectance were used in measurements. Results were compared to the model output for different pleating shape and incidence angles.
5 An Examination of Keyes Fabric Properties Chart: Almost 50 Years Later (OR-16-C056)
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Michael Collins, Ph.D., P.E., University of Waterloo
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Ned Huang, University of Waterloo
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John Wright, Ph.D., P.E., University of Waterloo
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From the late 1940's to the late 1960's, significant efforts were made by ASHVE and ASHRAE to evaluate and quantify the impact of window shading. In the context of the now defunct Shading Coefficient (SC), well known researchers such as Parmelee, Ozisik, Schutrum, Farber, Yellott and Keyes laid the groundwork for much of the work that followed decades later. Of particular interest are the efforts of Keyes, published by ASHRAE in 1967. In that work, he presented measurements of the solar-optical properties of fabrics determined using a custom made apparatus. The main contribution of this work was a method of classifying fabric properties based either on visible inspection, or property measurements. The result was the Keyes Universal Chart, which has been in the Fenestration Chapter of the ASHRAE Handbook of Fundamentals since the 1970's.
