Browsing University of Waterloo by Author "Collins, Michael R."
Now showing items 1-20 of 20
-
Assessing Convective Heat Transfer Coefficients Associated with Indoor Shading Attachments Using a New Technique Based on Computational Fluid Dynamics
Wright, John L.; Foroushani, Seyed Sepehr Mohaddes; Naylor, David; Collins, Michael R. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2015-01)ASHRAE research project RP-1311 concluded with the creation of simulation models, the ASHWAT models, for glazing systems with shading attachments. Such assemblies are known as Complex Fenestration Systems (CFS). ASHWAT ... -
Calculating Center-Glass Performance Indices of Windows with a Diathermanous Layer
Collins, Michael R.; Wright, John L. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2006)The fenestration chapter of the 2005 ASHRAE Hand-book—Fundamentals (ASHRAE 2005) has long included methods for determining the U-factor and solar heat gain coef-ficient (SHGC), or window performance indices, using the ... -
A Detailed Model to Determine the Effective Solar Optical Properties of Draperies
Kotey, Nathan Amon; Wright, John L.; Collins, Michael R. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2009)Drapes have the potential to reduce peak cooling load and annual energy consumption because they can be used to control solar gain. Thus, the need to model a drapes in a glazing system analysis is important. A detailed ... -
Determination of convective heat transfer for fenestration with between-the-glass louvered shades
Collins, Michael R.; Tasnim, Syeda Humaira; Wright, John L. (Elsevier, 2008-06-01)In previous work, a two-dimensional steady laminar natural convection model of a window cavity with between-panes louvers (i.e., slats) was developed by approximating the system as a vertical cavity with isothermal walls ... -
Determining Longwave Radiative Properties Of Flat Shading Materials
Kotey, Nathan Amon; Wright, John L.; Collins, Michael R. (2008-08)Solar gain through fenestration has a significant impact on building peak load and annual energy consumption. Shading devices, attached to fenestration, offer a cost effective strategy in controlling solar gain. The ... -
Determining Off-Normal Solar Optical Properties of Drapery Fabrics
Kotey, Nathan Amon; Collins, Michael R.; Wright, John L. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2009)The determination of off-normal solar optical properties of drapery fabrics is particularly useful in modelling the effective solar optical properties of pleated drapery. Special sample holders were designed and fabricated ... -
Determining Off-Normal Solar Optical Properties of Insect Screens
Wright, John L.; Collins, Michael R.; Kotey, Nathan Amon (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2009)Shading attachments may have a strong influence on solar gain. The determination of off-normal solar optical properties of individual layers of glazing/shading systems is required in order to estimate this solar gain, which ... -
Determining Off-Normal Solar Optical Properties of Roller Blinds
Kotey, Nathan Amon; Wright, John L.; Collins, Michael R. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2009)Solar gain through fenestration constitutes a significant portion of peak cooling load and annual energy consumption in buildings. As such, any reduction in solar gain translates into savings associated with the cost of ... -
An Examination of Keyes Universal Chart: 50 Years Later
Wright, John L.; Huang, Ned Y. T.; Collins, Michael R. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2016-01)From the late 1940's to the late 1960's, significant efforts were made by ASHVE and then ASHRAE to evaluate and quantify the impact of window shading. In the context of the now defunct Shading Coefficient, well known ... -
The Formation and Runoff of Condensate on a Vertical Glass Surface
Wright, John L.; Kansal, Vivek; Collins, Michael R. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2014)An experimental study of condensate formation and runoff was performed by exposing a sheet of glass, cooled at its bottom edge, to an enclosure with a controlled environment. This arrangement mimics the indoor glass surface ... -
Improving Load Calculations for Fenestration with Shading Devices
Wright, John L.; Barnaby, Charles S.; Collins, Michael R. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2009-10)Activities and findings arising from ASHRAE Research Project 1311-RP are summarized. This project included three main goals, (a) development of models for pleated drapes, venetian blinds, roller blinds and insect screens, ... -
Indoor-Side Convection Coefficients for Complex Fenestration Systems with Roller Blinds
Wright, John L.; Collins, Michael R.; Naylor, David; Foroushani, Seyed Sepehr Mohaddes (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2017-01)In order to characterize the resistor network that describes convective heat transfer on the indoor side of a complex fenestration system, three convection coefficients are needed. Although methods to obtain convection ... -
A method for determining the effective longwave radiative properties of pleated draperies
Kotey, Nathan Amon; Wright, John L.; Collins, Michael R. (Taylor & Francis, 2011-10-01)Draperies, attached to fenestration, offer a cost-effective strategy in controlling solar gain since draperies have the potential to reduce building peak load and annual energy consumption. The performance of a drapery is ... -
Numerical Analysis of Convective Heat Transfer in Fenestration with Between-the-Glass Louvered Shades
Wright, John L.; Collins, Michael R.; Tasnim, Syeda Humaira (Elsevier, 2009-10)A two-dimensional steady laminar natural convection model of a window cavity with between-panes louvers (i.e., slats) was developed by approximating the system as a vertical cavity with isothermal walls at different ... -
Off-normal solar optical property measurements using an integrating sphere
Collins, Michael R.; Wright, John L.; Kotey, Nathan Amon (Elsevier, 2012-01-01)Shading devices attached to windows can be used to control solar gain and hence reduce building peak load and annual energy consumption. The performance of a shading device in this regard is strongly dependent on its solar ... -
Off-Normal Solar-Optical Performance of Pleated Drapery: Simulation versus Measurement
Wright, John L.; Collins, Michael R.; Huang, Ned Y. T. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2016-01)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 ... -
A Simplified Method For Calculating The Effective Solar Optical Properties Of a Drapery
Kotey, Nathan Amon; Wright, John L.; Collins, Michael R. (2007-06)The use of draperies to control solar gain through windows is common in residential and commercial buildings and their potential for reduction of building peak load and annual energy consumption is recognized to be large. ... -
Solar Gain through Windows with Shading Devices: Simulation Versus Measurement
Wright, John L.; Kotey, Nathan Amon; Barnaby, Charles S.; Collins, Michael R. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2009)Shading devices offer a cost saving strategy in dynamically controlling solar gain through windows. As such, there is an ongoing effort to accurately quantify the thermal performance of shading devices. In the present ... -
Thermal Resistance of a Window with an Enclosed Venetian Blind: A Simplified Model
Wright, John L.; Collins, Michael R.; Huang, Ned Y. T. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2008)Solar gain has a strong influence on building energy consumption and peak cooling load. Venetian blinds are routinely used to control solar gain. Software based on 1-D models is available to accurately predict the thermal ... -
Thermal Resistance of a Window with an Enclosed Venetian Blind: Guarded Heater Plate Measurements
Wright, John L.; Huang, Ned Y. T.; Collins, Michael R. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2006)Window solar gain is known to have a strong influence on building energy consumption and peak cooling load. Venetian blinds are routinely used to control solar gain. Software based on one-dimensional models is available ...