Browsing University of Waterloo by Author "Wright, John L."
Now showing items 21-40 of 61
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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 ... -
Flow visualization of natural convection in a tall, air-filled vertical cavity
Wright, John L.; Jin, H.; Hollands, K. G. T.; Naylor, David (Elsevier, 2006-03-01)Natural convection of air in a tall vertical cavity was studied using a smoke patterns and interferometry. Experiments covered Rayleigh numbers of 4850 < Ra < 54,800 and aspect ratio A ≈ 40. Secondary cells were noted at ... -
Forced Convection From a Pair Of Spheres: A Three-Temperature Problem
Foroushani, Seyed Sepehr Mohaddes; Wright, John L.; Naylor, David (2015-05)Interaction of spherical particles in a fluid flow is important in combustion, chemical processes and air pollution. In this study, a recently developed technique for characterizing multi-temperature convective heat transfer ... -
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 ... -
Glazing System U-Value Measurement Using a Guarded Heater Plate Apparatus
Wright, John L.; Sullivan, Harry F. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 1988)Precise heat transfer measurements have been carried out during the last 20 years using a guarded heater plate apparatus. This apparatus has been adapted and used over the last several years to perform U-value measurements ... -
Heat Transfer Analysis of a Between-Panes Venetian Blind Using Effective Longwave Radiative Properties
Wright, John L.; Yahoda, Darryl S. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2004)Center-glass thermal analysis programs based on one-dimensional models have proved to be exceptionally useful. Recently efforts have been made to extend the analysis to include venetian blinds. It is convenient to model ... -
Heat Transfer Analysis Of Windows With Venetian Blinds: A Comparative Study
Wright, John L.; Lomanowski, Bartosz (2007-06)The potential to reduce building load and annual energy consumption is widely recognized in the use of shading devices to control solar gain. Consequently, the ability to include and model shading layers in complex glazing ... -
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 ... -
Laminar Free Convection from a Pair of Horizontal Cylinders: A Three-Temperature Problem
Wright, John L.; Naylor, David; Foroushani, Seyed Sepehr Mohaddes (2015-06)The formulation of multi-temperature convection problems in terms of a single driving temperature difference and a single heat transfer coefficient does not properly reflect the physics of the problem. Paired heat transfer ... -
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 ... -
Methods for Calculating the Effective Longwave Radiative Properties of a Venetian Blind Layer
Yahoda, Darryl S.; Wright, John L. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2004)Window solar gain can strongly influence building energy consumption, peak loads, and comfort. Shading devices are routinely used to control solar gain. The use of venetian blinds is particularly common. There is a strong ... -
Methods for Calculating the Effective Solar-Optical Properties of a Venetian Blind Layer
Yahoda, Darryl S.; Wright, John L. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 2005)Window solar gain can strongly influence building energy consumption, peak loads, and comfort. Shading devices are routinely used to control solar gain. The use of venetian blinds is particularly common. There is a strong ... -
Mitigation of Peak Cooling Demand through the Combination of Residential Zoned Cooling and Window Shading: A Building Simulation Case Study
Lomanowski, Bartosz; Wright, John L. (International Building Performance Simulation Association, 2014-05)The present study expands on previous building simulation work con-cerning the potential benefits of residential zoned cooling systems during peak summer days. Such zoned systems provide an opportunity for peak reduction ... -
Modeling Fenestration With Shading Devices In Building Energy Simulation: A Practical Approach
Wright, John L.; Lomanowski, Bartosz (International Building Performance Simulation Association, 2009-07)The use of operable shading devices impacts building loads significantly. The need exists for an explicit treatment of window shading devices in the design of energy efficient buildings through simulation. A general framework ... -
Natural Convection in Sealed Glazing Units: A Review
Wright, John L.; Sullivan, Harry F. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, 1989)In cold climates the augmented edge-glass heat transfer at the bottom of a glazing system creates a special problem. This is where condensed water and/or frost most readily occur. Two mechanisms determining the rate of ... -
A Novel Furnace Design Utilizing a Low Temperature Plastic Condensing Heat Exchanger
Wright, John L.; Sullivan, Harry F. (1982-03)The initial phase of a research and development program for the Consumers' Gas Co. and the Federal Department of Energy, Mines and Resources to design a condensing heat exchanger/gas fired residential air furnace has been ... -
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 ...