IP Library › Granted Patent US 12,738,882
Granted Patent B2
US 12,738,882 · App. 17/497,414 · Granted Sep 15, 2026

Systems and methods for conserving thermal and electrical energy usage in buildings and houses

Inventor: Moncef Krarti (Longmont, CO)
Assignee: The Regents of the University of Colorado
H02S20/32E04F10/10H02S20/23
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Quick Facts
Patent No.
US 12,738,882
App. No.
17/497,414
Granted
Sep 15, 2026
Kind
B2
Abstract

Systems and methods of use of movable shading devices, are disclosed. In some example implementations, the system can include one or more movable shading devices, where the one or more movable shading devices are configured to be selectively moveable, based on control by a programmable controller, with respect to an external surface of a building or house, where the external surface of the building or house includes at least one wall surface and at least one roof surface, to conserve at least one of cooling energy use associated with the building or house and/or heating energy use associated with the building or house.

Claims (39)

1 . A system, comprising:

at least one rail connected to an exterior surface of a building such that the at least one rail is parallel to ground below the rail;

one or more movable shading devices that slide across the external surface of the building along the at least one rail to cover a window of the building or to expose the window of the building, wherein at least one of the one or more movable shading devices includes at least one PV-integrated smart glazed panel;

a programmable controller operably coupled to at least one of the one or more movable shading devices;

wherein the programmable controller is configured to slide the at least one of the one or more movable shading devices with respect to the external surface of a building or house, wherein the external surface of the building or house includes at least one wall surface and at least one roof surface, and

wherein the programmable controller is configured to move at least one of the movable shading devices based on a building energy model, wherein the building energy model comprises information and the overall optical properties of the at least one roof surface as modified by respective positions of the movable shading devices relative to the roof.

2 . The system of claim 1 , wherein at least one of the one or more movable shading devices includes at least one photovoltaic (PV) array panel.

3 . The system of claim 1 , wherein the one or more movable shading devices comprise a PV-integrated smart glazed panel on both sides of the shading devices.

4 . The system of claim 1 , wherein at least one of the one or more movable shading devices is configured as a rotatable, PV-integrated overhang extending over at least one wall surface of the building or house.

5 . The system of claim 1 , wherein the one or more movable shading devices are slidable in position with respect to a roof of the building or house.

6 . The system of claim 1 , wherein the one or more moveable shading devices are slidable along a slope of a roof, to cover at least some of the roof.

7 . The system of claim 1 , wherein the one or more movable shading devices are configured as overhangs positioned on an edge of a roof of the building or house and are configured to provide shade over at least a portion of walls and/or windows of the building or house.

8 . The system of claim 1 , wherein the one or more movable shading devices are configured to rotate, with respect to an edge portion of a roof and with respect to the walls, about an angular axis defined by the edge portion of the roof, such that the one or more shading devices are positionable in a plurality of various angular positions with respect to the roof and with respect to the at least one wall surface.

9 . The system of claim 1 , wherein the one or more shading devices are configured to be adjustable in position and/or angle to rotate about an axis of rotation defined such that the one or more shading devices are tilted at a non-zero angle with respect to a lateral roofline of a roof of the building or house, and such that the one or more shading devices tilt in a first direction at a non-zero angle or tilt in a second, opposite direction than the first direction and at a non-zero angle.

10 . The system of claim 1 , further wherein the programmable controller configured to selectively cause the movement of the one or more movable shading devices.

11 . The system of claim 1 , wherein the programmable controller is further configured to move one or more of the movable shading devices according to solar tracking.

12 . The system of claim 1 , wherein the climate information comprises external temperature.

13 . The system of claim 1 , wherein the climate information comprises season information.

14 . The system of claim 1 , wherein the climate information comprises a time of day.

15 . The system of claim 1 , wherein the climate information comprises solar tracking information.

16 . The system of claim 1 , wherein the building energy model comprises thermal characteristics of the building.

17 . The system of claim 1 , wherein the building energy model further comprises a distinct building energy model, wherein the distinct building energy model comprises estimates of an energy performance of the at least one of the one or more movable shading devices at a plurality of predetermined time intervals.

18 . The system of claim 1 , wherein the at least one PV-integrated smart glazed panel comprise clear and tinted states.

19 . A system, comprising:

at least one rail connected to an exterior surface of a building such that the at least one rail is parallel to ground below the rail;

one or more movable shading devices that slide across the external surface of the building along the at least one rail to cover a window of the building or to expose the window of the building, wherein the one or more movable shading devices include at least one PV-integrated smart glazed panel;

a programmable controller operably coupled to at least one of the one or more movable shading devices;

wherein the programmable controller is configured to slide the at least one of the one or more movable shading devices with respect to the external surface of a building or house,

wherein the programmable controller is further configured to position one of the one or more movable shading devices on the at least one rail at an angle that is greater than 90 degrees as measured from portions of the exterior surface below the one of the movable shading devices;

wherein the external surface of the building or house includes at least one wall surface and at least one roof surface, and

wherein the programmable controller is configured to move the at least one of the movable shading devices based on a building energy model.

20 . A system, comprising:

at least one rail connected to an exterior surface of a building such that the at least one rail is parallel to ground below the rail;

one or more movable shading devices that slide across the external surface of the building along the at least one rail to cover a window of the building or to expose the window of the building, wherein the one or more movable shading devices include at least one PV-integrated smart glazed panel;

a programmable controller operably coupled to at least one of the one or more movable shading devices;

wherein the programmable controller is configured to slide the at least one of the one or more movable shading devices with respect to the external surface of a building or house,

one of the one or more movable shading devices on the at least one rail at an angle that is greater than 90 degrees as measured from portions of the exterior surface below the one of the one or more movable shading devices;

wherein the programmable controller is configured to move the at least one of the one or more movable shading devices based on a building energy model; and

wherein the angle between the shading device and the exterior surface can be controlled independently of the distance that the one of the movable shading devices slides along the rail.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 8, 2025
From: KRARTI, MONCEF
To: THE REGENTS OF THE UNIVERSITY OF COLORADO, BODY CORPORATE
Reel/Frame 072505/0148 →
Continuity (3)
Provisional Application 63197594 · Jun 7, 2021
Provisional Application 63089251 · Oct 8, 2020
Related Publication 20220115981A1 · Apr 14, 2022
References Cited (68)
US 6039390A · Agrawal · 2000 [cited by examiner]
US 6046399A · Kapner · 2000 [cited by examiner]
US 6055089A · Schulz · 2000 [cited by examiner]
US 6798158B2 · Evans · 2004 [cited by examiner]
US 9664976B2 · Rozbicki · 2017 [cited by examiner]
US 10024579B1 · Govar · 2018 [cited by examiner]
US 10072458B2 · Mullet · 2018 [cited by examiner]
US 10253564B2 · Hebeisen · 2019 [cited by examiner]
US 10601363B1 · Rubin · 2020 [cited by examiner]
US 10683979B2 · Gardiner · 2020 [cited by examiner]
US 10938337B1 · Carleton · 2021 [cited by examiner]
US 11349431B1 · Cerullo · 2022 [cited by examiner]
US 11429073B2 · Berman · 2022 [cited by examiner]
US 11887312B2 · Fiala · 2024 [cited by examiner]
US 20050200937A1 · Weidner · 2005 [cited by examiner]
US 20090027759A1 · Albahri · 2009 [cited by examiner]
US 20090120016A1 · Hon · 2009 [cited by examiner]
US 20090320898A1 · Gumm · 2009 [cited by examiner]
US 20100018571A1 · Placer · 2010 [cited by examiner]
US 20100065108A1 · West · 2010 [cited by examiner]
US 20100193013A1 · Kong · 2010 [cited by examiner]
US 20100269888A1 · Johnston, Jr. · 2010 [cited by examiner]
US 20100324962A1 · Nesler · 2010 [cited by examiner]
US 20120138549A1 · Choi · 2012 [cited by examiner]
US 20140198371A1 · Conklin · 2014 [cited by examiner]
US 20150168003A1 · Stefanski · 2015 [cited by examiner]
US 20160085130A1 · Timofejevs · 2016 [cited by examiner]
US 20170130520A1 · Cornelissen · 2017 [cited by examiner]
US 20170336104A1 · Tenghoff · 2017 [cited by examiner]
US 20180102734A1 · Katz · 2018 [cited by examiner]
US 20180129172A1 · Shrivastava · 2018 [cited by examiner]
US 20180301578A1 · Rozbicki · 2018 [cited by examiner]
US 20190036480A1 · Barr · 2019 [cited by examiner]
US 20190267933A1 · Janowski · 2019 [cited by examiner]
US 20190284871A1 · Papamichael · 2019 [cited by examiner]
US 20190341878A1 · Watson · 2019 [cited by examiner]
US 20190386606A1 · Raghunathan · 2019 [cited by examiner]
US 20200076359A1 · Bahn · 2020 [cited by examiner]
US 20200295700A1 · Vaidyanathan · 2020 [cited by examiner]
US 20200321904A1 · Petrachi · 2020 [cited by examiner]
US 20200395885A1 · Janowski · 2020 [cited by examiner]
US 20210242823A1 · Cohenmeyer · 2021 [cited by examiner]
US 20220111744A1 · Ohno · 2022 [cited by examiner]
US 20220251835A1 · Vervisch · 2022 [cited by examiner]
US 20220271703A1 · Mensink · 2022 [cited by examiner]
US 20220372764A1 · Wang · 2022 [cited by examiner]
US 20230139451A1 · Krarti · 2023 [cited by examiner]
Aldawoud, A. 2013. Conventional fixed shading devices in comparison to an electrochromic glazing system in hot, dry climate, Energy and Buildings, 59, 104-110. [cited by applicant]
Ashrae, ANSI/ASHRAE/IES. Standard 90.2-2018 Energy-Efficient Design of Low-Rise Residential Buildings, American Society of Heating, Refrigeration and Air-Conditioning Engineers, Atlanta, GA, 2018. [cited by applicant]
Babaizadeh, H., Haghighi, N., Asadi, S., Broun, R., and Riley, D. 2015. Life cycle assessment of exterior window shadings in residential buildings in different climate zones. Building and Environment, 90, 168-177. [cited by applicant]
Cho, J., Yoo, C., and Kim, Y. 2014. Viability of exterior shading devices for high-rise residential buildings: Case study for cooling energy saving and economic feasibility analysis. Energy and Buildings, 82, 771-785. [cited by applicant]
David, M., Donn, M., Garde, F., and Lenoir, A. 2011. Assessment of the thermal and visual efficiency of solar shades, Building and Environment, 46(7), 1489-1496. [cited by applicant]
Hammad, F., and Abu-Hijleh, B. 2010. The energy savings potential of using dynamic external louvers in an office building. Energy and Buildings, 42, 1888-1895. [cited by applicant]
Hassan, M.A., Shebl, S.S., and Ibrahim, E.A., 2011, Modeling and validation of the thermal performance of an affordable, energy efficient, healthy dwelling unit. Building Simulation, 4, 255.262. [cited by applicant]
Hoffmann, S., Lee, S.E., McNeil, A., Fernandes, L., Dragan Vidanovic, D., and Thanachareonkit, A. 2016. Balancing daylight, glare, and energy-efficiency goals: An evaluation of exterior coplanar shading systems using co… [cited by applicant]
Idchabani, R., El Ganaoui, M., and Sick, F. 2017. Analysis of exterior shading by overhangs and fins in hot climate. Energy Procedia, 139, Dec. 2017, pp. 379-384. [cited by applicant]
Kim, G., Hong, S.L., Tae, S.L., Schaefer Laura, S., and Taidim Jeong, T. 2012. Comparative advantage of an exterior shading device in thermal performance for residential buildings, Energy and Buildings, 46, 105-111. [cited by applicant]
Kim, H., and Clayton, M.J. 2020. Parametric behavior maps: A method for evaluating the energy performance of climate-adaptive building envelopes, Energy and Building, 219, 110020. [cited by applicant]
Konstantoglou, M., and Tsangrassoulis, A. 2016, Dynamic operation of daylighting and shading systems: a literature review, Renewable and Sustainable Energy Reviews, 60, 268-283. [cited by applicant]
Krarti, M. 2020. Evaluation of Energy Performance of Dynamic Overhang Systems for US Residential Buildings, submitted for Buildings and Energy Journal. [cited by applicant]
Loonen, R. C.G.M., Favoino, F., Hensen, J.L.M., and Overend, M., 2017. Review of current status, requirements and opportunities for building performance simulation of adaptive facades. Journal of Building Performance Si… [cited by applicant]
Loutzenhiser, P.G., Maxwell, G.M., and Manz, H. 2007. An empirical validation of the daylighting algorithms and associated interactions in building energy simulation programs using various shading devices and windows, E… [cited by applicant]
Meldem, R., and Winkelmann, F. 1998. Comparison of DOE-2 with temperature measurements in the Pala test houses. Energy and Buildings, 27(1), 69-81. [cited by applicant]
Nielsen, M.V., Svendsen, S., and Jensen, L. B. 2011. Quantifying the potential of automated dynamic solar shading in office buildings through integrated simulations of energy and daylight, Solar Energy, 85(5), 757-768. [cited by applicant]
Nrel, National Solar Radiation Database 1991-2010 Update, (2012). https://rredc.nrel.gov/solar/old_data/nsrdb/1991-2010/. [cited by applicant]
S. Cho, S. Ray, P. Im, H. Honari, J. Ahn, Methodology for energy strategy to prescreen the feasibility of Ground Source Heat Pump systems in residential and commercial buildings in the United States, Energy Strateg. Rev… [cited by applicant]
SAM. 2020. Solar Advisor Module. Analysis tool for Solar Distributed Generation Systems, National Renewable Energy Laboratory, Golden, CO. https://sam.nrel.gov/. [cited by applicant]
Machokostas, A., and Madamopoulos, N. 2016. Quantification of energy savings from dynamic solar radiation regulation strategies in office buildings, Energy and Buildings, 122, 140-149. [cited by applicant]