Second Generation Photovoltaic Prototype

 

Toronto Grid – Sunlight Studies

 

Denegri Bessai Studio – in collaboration with Internat Energy Solutions Canada (IESC) and the support of the Design Industry Advisory Committee (DIAC) – put together comprehensive research required for  the design and implementation of a multi-functional building-integrated photo voltaic (BIVP) system for multi-storey buildings in Ontario.

This project’s objective is to develop and commercialize a multifunctional building-integrated photovoltaic (BIPV) glazing design as a more energy efficient substitute for standard glazing in new building construction or as a retrofit of existing structures. The BIPV glass panel will minimize heat transfer to the external environment when not desired, block undesired solar gains (but still transmit visible light) and finally produce an electrical load that can be used within the building or introduced to the power grid.

Three Building types were identified as useful case studies for this report: a commercial office tower, a residential condominium tower, and a mid-rise institutional building. These urban building types represent the likely market for IESC’s BIPV application in the coming years.

This diagram illustrates the structural systems typical of each of the three building types studied here. Steel columns have a high strength to width ratio meaning they are an efficient use of space for commercial construction. They are often used in open commercial floor plans encased in a noncombustible material. Concrete columns contain steel reinforcement. They are also common in open floor plans. Columns are not sufficient to resist the lateral forces on a building. High rise construction can use bracing or concrete cores. Concrete cores are common because they fulfill the dual purpose of structural diaphragm and elevator shaft or emergency exit stairwell. Vertical runs for utilities, mechanical, and electrical equipment are most conveniently located within these core shear walls.

 Energy is captured on the building façade via the PV modules and arrays embedded in the glazing units. It is sent as Direct Current through internal conduit to power inverters located in or adjacent to the building core on every floor or second floor of the building, where it is converted to Alternating Current, Research and interviews uncovered several options for the output of this energy. (Ministry of Energy, Ontario Government, Ontario Power Authority, PWC)

Energy harvested from the Building Integrated PV panels must be converted from DC to AC at an inverter room so that it may be available for common usages. Once it is converted to alternating current there are three options for its use:

1. Storage for later use in the building. This would require significant space demand for a storage unit.

2. Release back into the grid for net metering.

3. Redirection to other building systems.

 

Installation of the window wall or curtain wall system in all of the 3 building type case studies that we have identified share the common feature that they are installed at an early stage in the construction process. Once the building core, columns and floor plates are in place, the perimeter cladding- the building envelope- is installed. At this point in the construction workflow, there are no HVAC or electrical systems or specialists on the job site. The curtain wall/ window wall installation is strictly a mechanical installation whereby the envelope components, whether unitized or assembled in place, are bolted to the perimeter of the building.

To install a unitized curtain wall, each unit is lowered down from a pulley system or mechanical device temporarily installed on a girder that is is secured to the structure of the floor a few storeys above. The team situates themselves on the interior of the floor plate to receive the unit. Steel fasteners should already be in place. The glazing system is applied one floor at a time beginning with the ground floor.

 

First Generation BIPV Grazing Module Elevation and Section Detail (IESC)

 

 

 

Building Types and Their Structural Composition

 

 

 

 
BIPV Energy Path Diagram

 

 

Stick Frame Curtain Wall Installation

 

 

Unitized Curtain Wall Installation

 

 

 

 

 

Reference Material
Allen, Edward. Fundamentals of Building Construction. New Jersey: John Willey & Sons, Inc., 2004.  Architectural Energy Corporation. “Energy Design Resources.” 2004. Energy Design Resources Design Brief: Building Integrated Photovoltaics. 15 02 2013 <http://www.energydesignresources.com/media/1756/EDR_ DesignBriefs_integphotovoltaics.pdf>.
Ching, Francis D K. Building Construction Illustrated. New Jersey: John Wiley & Sons, Inc., 2008.
Donenfeld, Eli. Project Manager at FirstCon Group Inc. Alexis Schneider. February 2013.
Hobbs, John. “The Canadian Handbook of Practice for Architects.” Cost Planning and Control. National Practice Program for the Profession of Architecture in Canada, 1999. 334-352.
Hobbs, John. “The Canadian Handbook of Practice for Architects.” Types of Construction Project Delivery. National Practice Program for the Profession of Architecture in Canada, 1999. 311-333.
Hobbs, John. “The Candian Handbook of Practice for Architecture.” Management of the Project. National Practice Program for the Profession of Architecture in Canada, 1999. 251-268.
Hutcheon, Neil B. and Gustav O.P. Handegord. Building Science for a Cold Climate. National Research Council of Canada, 1995.
Lang, Gerry. Architect at Architects Alliance Alexis Schneider. February 2013.
Leslie, Jacquie. Associate Architecture at Dialog Alexis Schneider. February 2013.
Lyons, John. Manager of Sustainability at Dialog Alexis Schneider. February 2013.
Ministry of Energy, Ontario Government. “Net Metering in Ontario.” Official Website of the Ministry of Energy, Government of Ontario. 13 03 2013 <http://www.mei.gov.on.ca/en/pdf/renewable/NetMeteringBrochure.pdf>.
Ontario Power Authority. “Feed-In Tariff (FIT) Program: Program Overview.” 2012. Ontario Power Authority. 13 March 2013 <http://fit.powerauthority.on.ca/sites/default/files/page/FIT_Program_Overview_Version_2.pdf>.
Ontario Power Authority: FIT Price Schedule. 2012. 13 March 2013 <http://fit.powerauthority.on.ca/fit-program/fit-program-pricing/fit-price-schedule>.
Platt, Michael and Andrew M. Reback. Clean Energy Tax Incentives: Current and Proposed. 20 09 2011. 13 03 2013 <http://www.casselsbrock.com/CBNewsletter/Clean_Energy_Tax_Incentives__Current_and_Proposed>.73 References
PWC. “Tax News Network.” August 2012. PWC. 13 March 2013 <https://www.ca.taxnews.com/tnnnews.nsf/Date Web/9BD6AD52106058D785257A60006BF3DD/$file/Oil%20and%20Gas%20Taxation%20in%20Canada_2012. pdf>.
Quirouette, Rick. Decoding Glass & Aluminium Curtain Wall Systems. 20 December 2011. 2 March 2013 <http:// www.facadenexus.com/classified/articles.asp?id=18>.
Schüco. Building Integrated Photovoltaic (BIPV) Systems. 2013. 4 March 2013 <http://www.schueco.com/web/ ca/commercial/solarstrom_und_waerme/products/photovoltaic_systems/pv_modules/schueco_ProSol_PV_ Modules>.
Product Innovations. March 2013 <http://www.schueco.com/specials/profile_magazin/profile_ magazin_10_2013/#/58>.
The Holloway Consulting Group, LLC. Construction Defects Expert / Curtain Wall / Window Wall. February 2013 <http://www.disputesinconstruction.com/construction-dispute-curtain-wall-window-wall/>.
“Unitized Curtain Wall Installation.” 31 December 2009. Youtube. 27 February 2013 <http://www.youtube.com/ watch?v=rXsqTHa6mQs>.
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