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Overview and Introduction to DAYSIM and Current Research Developments 1 / 63Sept. 12, 2012
Overview and Introduction to DAYSIM and Current Research Developments
J. Alstan Jakubiecalstan@jakubiec.net
Christoph F. Reinhart
Massachusetts Institute of Technology, Building Technology Program
Overview and Introduction to DAYSIM and Current Research Developments
Overview and Introduction to DAYSIM and Current Research Developments 2 / 63Sept. 12, 2012
Presentation Outline
Introduction to DAYSIM
Simulation of Shading Devices
Electric Lighting Simulation
Examples and Implementation
Questions and Live Demonstration
Overview and Introduction to DAYSIM and Current Research Developments 3 / 63Sept. 12, 2012
Introduction to DAYSIM
Overview and Introduction to DAYSIM and Current Research Developments 4 / 63Sept. 12, 2012
Annual Simulations in DAYSIM
DIVA for Rhino - Environmental Analysis for Buildings 3 / 11Aug. 1, 2012
The DIVA-definition of a well-daylit space
Occupant Behavior and Controls
Daylight Availability Energy
Visual Comfort
A space that is primarily lit with natural light and that combines a high occupant satisfaction with the
visual and thermal environment with low overall energy use for lighting, heating and cooling.
DAYSIM models the effects of occupant behavior and experience on daylight availability and lighting energy use.
Overview and Introduction to DAYSIM and Current Research Developments 5 / 63Sept. 12, 2012
Annual Illuminance and Irradiance Calculations
Calculate hourly or sub-hourly illuminance (lx) or irradiance (kWhm-2) values.
Screen Capture of Photovoltaic Potential Map, Cambridge, MA
Overview and Introduction to DAYSIM and Current Research Developments 6 / 63Sept. 12, 2012
Climate-Based Daylighting Metrics
100%806040200
Overlit Areas
Percent of Occupied Hours
Daylight Autonomy
(500lx)
Daylight Availability
(500lx)
Continuous Daylight Autonomy
(500lx)
Useful Daylight Illuminance
< 100lx
Useful Daylight Illuminance > 2000lx
Useful Daylight Illuminance
100lx-2000lx
Overview and Introduction to DAYSIM and Current Research Developments 7 / 63Sept. 12, 2012
Model Occupant Behavior and Automatic Control Systems with GenDGPProfile.exe
Annual Visual Discomfort from a Single Viewpoint
Annual Visual Discomfort of an Occupant who Can Adapt
Overview and Introduction to DAYSIM and Current Research Developments 8 / 63Sept. 12, 2012
Model Annual Performance of Shading and Lighting SystemsSplit Blind Study
Daylit Area 45%DAmean= 45%Lighting = 7.8 kWh/m2 yr
Daylit Area 69%DAmean= 65%Lighting = 5.7 kWh/m2 yr
Daylit Area 62%DAmean= 57%Lighting = 6.3 kWh/m2 yr
No Shades Single Blind System Split Blind System
100%806040200
Percent of Occupied Hours
Overview and Introduction to DAYSIM and Current Research Developments 9 / 63Sept. 12, 2012
Integrate Detailed Daylighting Analysis with Thermal Simulations
Oriented Towards Window(blinds primarily closed)
0
5
10
15
20
25
30
35
40
1 2 3 4 5 6 7 8 9 10 11 12
EUI k
Wh/
m2
Month
Lighting [x20] Heating Cooling
• Lighting − 11.8 kWh/m2
• Heating − 159.1 kWh/m2
• Cooling − 34.9 kWh/m2
• Total − 205.8 kWh/m2
(blinds closed 75% of occupied time)
Oriented Away From Window(blinds open in Summer)
0
5
10
15
20
25
30
35
40
1 2 3 4 5 6 7 8 9 10 11 12
EUI k
Wh/
m2
Month
Lighting [x20] Heating Cooling
• Lighting − 8.4 kWh/m2
• Heating − 153.2 kWh/m2
• Cooling − 48.7 kWh/m2
• Total − 210.3 kWh/m2
(blinds closed 30% of occupied time)
Output lighting and shading schedule files for use in separate thermal simulation programs.
Overview and Introduction to DAYSIM and Current Research Developments 10 / 63Sept. 12, 2012
The Mechanics
A brief explanation of how this works in DAYSIM.
Overview and Introduction to DAYSIM and Current Research Developments 11 / 63Sept. 12, 2012
Components of a Daylight Simulation
Overview and Introduction to DAYSIM and Current Research Developments
Overview and Introduction to DAYSIM and Current Research Developments 12 / 63Sept. 12, 2012
Scene Files• Radiance format geometry and materials
Area of Interest• User defined sensor points file• Occupant viewpoints
Space Usage• Occupancy schedule• Furniture layout• Lighting system• Shading system
Sky Model• Perez sky based on hourly or sub-hourly weather file
DAYSIMIlluminances
Results Processor
Simulation OutcomesDaylight Autonomy / Availability
Useful Daylight IlluminanceLighting Energy Consumption
Shading Device UseVisual Comfort
Overview and Introduction to DAYSIM and Current Research Developments 13 / 63Sept. 12, 2012
Default Sky Discretization Process (Daylight Coefficients)
~65 Direct Solar Divisions in ‘DS’ Scheme
3 Ground Divisions145 Diffuse Sky Divisions
• Daylight coefficient method.• 145 Tregenza diffuse sky subdivisions• 3 ground divisions• Approximately 65 direct solar positions. Bilinear interpolation used to calculate illuminance contribution in ‘DS’ scheme. • ‘DDS’ method uses 2305 direct solar positions.
Overview and Introduction to DAYSIM and Current Research Developments 14 / 63Sept. 12, 2012
Calculating Illuminance and Turning into Useful Results
Contribution to Illuminance at Each Sensor Point
Daylight Autonomy Distribution in Boston, MA
100%
80
60
40
20
0Perc
ent O
ccup
ied
Hour
s ≥
500l
x (D
A 50
0lx)
Annual Unshaded Illuminance Map at One Sensor Point
Overview and Introduction to DAYSIM and Current Research Developments 15 / 63Sept. 12, 2012
The ‘Header’ File
################################################# DAYSIM 3.0 Project File Generated by DIVA v2.0################################################project_name ReferenceOfficeproject_directory C:\DIVA\temp\ReferenceOffice\bin_directory C:\DIVA\DaysimBinaries\tmp_directory C:\DIVA\temp\ReferenceOffice\Template_File C:\DIVA\DIVATemplate.htm
################################################# site information################################################place Boston Logan IntL Arpt_USAlatitude 42.37longitude 71.02time_zone 75site_elevation 6.0first_weekday1time_step 60wea_data_short_fileUSA_MA_Boston-Logan.Intl.weawea_data_short_file_units1lower_direct_threshold2lower_diffuse_threshold2output_units 2
################################################# Building Information################################################occupancy-file8to6withDST.60min.occ.csvmaterial_fileReferenceOffice_material_daysim.radgeometry_fileReferenceOffice_daysim.radradiance_source_files2,C:\DIVA\Daylight\material.rad,C:\DIVA\temp\ReferenceOffice\ReferenceOffice.rad...
• The header file is a list of inputs that controls everything DAYSIM does during a simulation. ◊ Geometry and climate data ◊ Occupant behavior ◊ Shading and lighting systems ◊ Results• This presentation is not detailed documentation of the header file.• As examples are shown, relevant parts of the header file will also be illustrated.• This is a prelude to Department of Energy funded work on complete documentation of DAYSIM.
Overview and Introduction to DAYSIM and Current Research Developments 16 / 63Sept. 12, 2012
DAYSIM Program Interfaces
Ecotect
http://usa.autodesk.com/ecotect-
analysis/
Rhinoceros 3D
DIVA http://www.diva4rhino.com
SketchUp
su2rad & su2dshttp://code.google.com/p/su2rad/
http://code.google.com/p/su2ds/
Overview and Introduction to DAYSIM and Current Research Developments 17 / 63Sept. 12, 2012
DAYSIM Program Interfaces
Or setup a project using the DAYSIM Java interface with existing Radiance files.
Overview and Introduction to DAYSIM and Current Research Developments 18 / 63Sept. 12, 2012
Disclaimer
I work for Solemma, LLC who develop and sell DIVA.
All of the simulations shown here were prepared using DIVA, but could be performed using other software.
Overview and Introduction to DAYSIM and Current Research Developments 19 / 63Sept. 12, 2012
Simulation of Shading Devices
Overview and Introduction to DAYSIM and Current Research Developments 20 / 63Sept. 12, 2012
Modelling Occupants and Shading Devices in DAYSIM
Blinds Open
Blinds Closed by User
• In a real building, windows are not always unobstructed.
• It is important to predict how often a shading device might be open or closed as it makes a large difference in the amount of available daylight.
Overview and Introduction to DAYSIM and Current Research Developments 21 / 63Sept. 12, 2012
Effect of Shades in a Small Sidelit Space
Shaded Result (Mean DA, 72%)Unshaded Result (Mean DA, 100%)
Overview and Introduction to DAYSIM and Current Research Developments 22 / 63Sept. 12, 2012
Two Ways to Model Contribution of Shading Devices
1. Conceptual Dynamic Shading
2. Detailed Dynamic Shading
• When shades are closed, direct component is neglected and diffuse component scaled by 25%.• Only one simulation. • Unnecessary to model shading geometry, but above assumptions are made.
• Each state of a shading device (up, half-open, down, etc.) is simulated separately and pieced together annually based on shading controls.• As many simulations as shading device states.• Geometry of shading devices must be created in separate Radiance files.
Overview and Introduction to DAYSIM and Current Research Developments 23 / 63Sept. 12, 2012
Conceptual Dynamic Shading
50 W/m2 is the value controlling whether shades are opened or closed in ‘Conceptual’ dynamic shading controls.
Overview and Introduction to DAYSIM and Current Research Developments 24 / 63Sept. 12, 2012
Conceptual Dynamic Shading
...=========================== Shading Control System==========================shading 0conceptual_dynamic_systemfig.dcshade_up.illshade_down.ill
...
sensor_file_info0000000000000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 BG1 0 0 0 0 BG1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#theabovedefinesinthesensorpoints#listfilewhereoccupantssit#(whichsensorsaretriggeredbythe# 50 W/m2 threshold)...
Overview and Introduction to DAYSIM and Current Research Developments 25 / 63Sept. 12, 2012
Detailed Dynamic Shading
Mechanical Dynamic Shading (Blinds)
Switchable Dynamic Shading (Electrochromic Glazing)
Detailed dynamic shading allows control over the geometry of shades, their operation, the setting of multiple shading states and material properties.
Overview and Introduction to DAYSIM and Current Research Developments 26 / 63Sept. 12, 2012
Detailed Dynamic Shading: Manual Control
...=========================== Shading Control System==========================shading-1 ReferenceOffice.dcReferenceOffice.illshading_group_1 1 ManualControlC:\DIVA\Daylight\blank.rad SG0BS0.rad SG0BS0.dc SG0BS0.ill...
100%
80
60
40
20
0Perc
ent O
ccup
ied
Hour
s ≥
500l
x (D
A 50
0lx)
• Operates in the same manner as conceptual dynamic shading. • Or using a previously run daylight glare probability (DGP) calculation (more later).
Overview and Introduction to DAYSIM and Current Research Developments 27 / 63Sept. 12, 2012
Detailed Dynamic Shading: Automated Thermal Control
...=========================== Shading Control System==========================shading-1 ReferenceOffice.dcReferenceOffice.illshading_group_1 1 AutomatedThermalControl C:\DIVA\Daylight\blank.rad 250 2500 SG0BS0.rad SG0BS0.dc SG0BS0.ill...
100%
80
60
40
20
0Perc
ent O
ccup
ied
Hour
s ≥
500l
x (D
A 50
0lx)
• Automatically closes shades when sensor detects 2500lx and opens blinds if selected sensors falls below 250lx.• These values are user definable.
Overview and Introduction to DAYSIM and Current Research Developments 28 / 63Sept. 12, 2012
Detailed Dynamic Shading: Automated Thermal Control With Unoccupied or Cooling Period
...=========================== Shading Control System==========================shading-1 ReferenceOffice.dcReferenceOffice.illshading_group_1 1 AutomatedThermalControlWithOccupancy06010815C:\DIVA\Daylight\blank.rad 250 2500 SG0BS0.rad SG0BS0.dc SG0BS0.ill...
100%
80
60
40
20
0Perc
ent O
ccup
ied
Hour
s ≥
500l
x (D
A 50
0lx)
• Blinds are always closed during the cooling period (06-01 to 08-15) during unoccupied hours and always opened during the heating period.
Overview and Introduction to DAYSIM and Current Research Developments 29 / 63Sept. 12, 2012
Detailed Dynamic Shading: Automated Glare Control
• Set outdoor sensors and control blinds based on exterior illuminance and/or position of the sun.
• This mode is a work in progress.
Overview and Introduction to DAYSIM and Current Research Developments 30 / 63Sept. 12, 2012
Manual Occupant Control Using Daylight Glare Probability
East Facing Occupant Predicted Visual Comfort
West Facing Occupant Predicted Visual Comfort
Resulting Shade Use
...=========================== User Description==========================occupancy58to6withDST.60min.occ.csvminimum_illuminance_level 500daylight_savings_time 1user_profile1active 100 1 3...
# User type 3 means occupant adjusts # shading devices to maintain visual # comfort if DGP simulation results # exist.
# User type 1,incontrast,# uses selected sensor point values # over 50 W/m2
Overview and Introduction to DAYSIM and Current Research Developments 31 / 63Sept. 12, 2012
What is Daylight Glare Probability?
> 0.45 Intolerable< 0.30 Barely Perceptible
improved measurement technology and methodology
For more information see,
Wienold J, Christoffersen J. Evaluation methods and development of a new glare prediction model for daylight environments with the use of CCD cameras. Energy and Buildings 2006; 38: 743-757.
Wienold, J. Dynamic Daylight Glare Evaluation. Proceedings of Building Simulation; 2009.
Overview and Introduction to DAYSIM and Current Research Developments 32 / 63Sept. 12, 2012
Allowing an Occupant to Adapt to Daylight in a Space
90o
Range of Possible Seating Positions for a Single Occupant
Overview and Introduction to DAYSIM and Current Research Developments 33 / 63Sept. 12, 2012
Allowing an Occupant to Adapt to Daylight in a Space
Annual Visual Discomfort from a Single Viewpoint Annual Visual Discomfort of an Occupant who Can Adapt
...AdaptiveZoneApplies 1...
• Simulate multiple DGP visual comfort viewpoints, and DAYSIM automatically chooses the most comfortable.• Currently only works for a single occupant.
Overview and Introduction to DAYSIM and Current Research Developments 34 / 63Sept. 12, 2012
Electric Lighting Simulation
Overview and Introduction to DAYSIM and Current Research Developments 35 / 63Sept. 12, 2012
Electric Lighting Simulations: Occupant Control
Lightswitch Algorithm -- Stochastic Occupant Control Based on a field study of one office building in Nürtingen.
Overview and Introduction to DAYSIM and Current Research Developments 36 / 63Sept. 12, 2012
Electric Lighting Simulations: Occupant Control
Lightswitch Algorithm
Overview and Introduction to DAYSIM and Current Research Developments 37 / 63Sept. 12, 2012
Lightswitch Occupant Behavior Probabilities
Probability of Turning On lights when Arriving Probability of Switching Off Lights when Leaving
• Two user types: considers and does not consider daylight.• Occupants unlikely to turn on lights unless illuminance is below 200lx. • Sometimes people forget to turn off the lights, especially when they plan to come back soon. They forget to turn them off more often when there are occupancy or dimming sensors.
Overview and Introduction to DAYSIM and Current Research Developments 38 / 63Sept. 12, 2012
Manual Lighting Control
...=========================== Electric Lighting System==========================electric_lighting_system 11 manual_control 110.0 1...
Overview and Introduction to DAYSIM and Current Research Developments 39 / 63Sept. 12, 2012
Manual Lighting Control with Dimming Sensor
...=========================== Electric Lighting System==========================electric_lighting_system 14 manual_dimming 110.0 1 3.0 20 500...
Overview and Introduction to DAYSIM and Current Research Developments 40 / 63Sept. 12, 2012
Occupancy On/Off Sensor
...=========================== Electric Lighting System==========================electric_lighting_system 33 occupancy_on_off 110.0 1 3.0 5...
Overview and Introduction to DAYSIM and Current Research Developments 41 / 63Sept. 12, 2012
Occupancy On/Off Sensor with Dimming
...=========================== Electric Lighting System==========================electric_lighting_system 16 occ_onoff_dim 110.0 1 3.0 20 500 5...
Overview and Introduction to DAYSIM and Current Research Developments 42 / 63Sept. 12, 2012
Several Lighting (or Shading) Systems Per Zone
Manual Control
Manual Control with Dimming Sensor
Occupancy On/Off with Dimming Sensor
Overview and Introduction to DAYSIM and Current Research Developments 43 / 63Sept. 12, 2012
Several Lighting (or Shading) Systems Per Zone
Manual Control
Manual Control with Dimming Sensor
Occupancy On/Off with Dimming Sensor
...=========================== Electric Lighting System==========================electric_lighting_system 31 manual_control 110.0 14 manual_dimming 110.0 1 3.0 20 5006 occ_onoff_dimming 110.0 1 3.0 20 500 5...sensor_file_info0000000LG1000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 LG1 0 0 0 0 0 0 0 0 0 0 0 LG2 0 0 0 0 LG2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 LG3 0 0 0 0 0 LG3 0 0...
• Where dimming or shading sensors are located is important too.• Currently DAYSIM assumes perfect sensor knowledge of Illuminance from daylight, but this is not always the case.
Overview and Introduction to DAYSIM and Current Research Developments 44 / 63Sept. 12, 2012
Some Examples
Overview and Introduction to DAYSIM and Current Research Developments
Overview and Introduction to DAYSIM and Current Research Developments 45 / 63Sept. 12, 2012 DIVA for Rhino - Environmental Analysis for Buildings 5 / 11Aug. 1, 2012
A simple question: How should I design the furniture in my space?
Oriented Towards WindowOriented Away From Window
Overview and Introduction to DAYSIM and Current Research Developments
Overview and Introduction to DAYSIM and Current Research Developments 46 / 63Sept. 12, 2012 DIVA for Rhino - Environmental Analysis for Buildings 6 / 11Aug. 1, 2012
A simple question: How should I design the furniture in my space?
Oriented Towards WindowOriented Away From Window
Visual Comfort: blinds closed 30% of occupied hours Visual Comfort: blinds closed 75% of occupied hours
Overview and Introduction to DAYSIM and Current Research Developments
Overview and Introduction to DAYSIM and Current Research Developments 47 / 63Sept. 12, 2012 DIVA for Rhino - Environmental Analysis for Buildings 7 / 11Aug. 1, 2012
A simple question: How should I design the furniture in my space?
Oriented Towards WindowOriented Away From Window
Visual Comfort: blinds closed 30% of occupied hours Visual Comfort: blinds closed 75% of occupied hours
Daylight Autonomy: 61%Daylight Autonomy: 82%
Overview and Introduction to DAYSIM and Current Research Developments
Overview and Introduction to DAYSIM and Current Research Developments 48 / 63Sept. 12, 2012 DIVA for Rhino - Environmental Analysis for Buildings 8 / 11Aug. 1, 2012
A simple question: How should I design the furniture in my space?
Oriented Towards WindowOriented Away From Window
Visual Comfort: blinds closed 30% of occupied hours Visual Comfort: blinds closed 75% of occupied hours
0
5
10
15
20
25
30
35
40
1 2 3 4 5 6 7 8 9 10 11 12
EUI k
Wh/
m2
Month
Lighting [x20] Heating Cooling
0
5
10
15
20
25
30
35
40
1 2 3 4 5 6 7 8 9 10 11 12
EUI k
Wh/
m2
Month
Lighting [x20] Heating Cooling
Energy ConsumptionDaylight Autonomy: 61%Energy ConsumptionDaylight Autonomy: 82%
• Lighting − 11.8 kWh/m2
• Heating − 159.1 kWh/m2
• Cooling − 34.9 kWh/m2
• Lighting − 8.4 kWh/m2
• Heating − 153.2 kWh/m2
• Cooling − 48.7 kWh/m2
Overview and Introduction to DAYSIM and Current Research Developments 49 / 63Sept. 12, 2012
Museum Lighting Analysis by Arup Lighting
source: Matt Franks, Arup Lighting http://www.radiance-online.org/community/workshops/2005-montreal/PDF/Franks_ArupCaseStudies.pdf
Overview and Introduction to DAYSIM and Current Research Developments 50 / 63Sept. 12, 2012
Museum Lighting Analysis by Arup Lighting
source: Matt Franks, Arup Lighting http://www.radiance-online.org/community/workshops/2005-montreal/PDF/Franks_ArupCaseStudies.pdf
Overview and Introduction to DAYSIM and Current Research Developments 51 / 63Sept. 12, 2012
Museum Lighting Analysis by Arup Lighting
source: Matt Franks, Arup Lighting http://www.radiance-online.org/community/workshops/2005-montreal/PDF/Franks_ArupCaseStudies.pdf
Overview and Introduction to DAYSIM and Current Research Developments 52 / 63Sept. 12, 2012
Museum Lighting Analysis by Arup Lighting
source: Matt Franks, Arup Lighting http://www.radiance-online.org/community/workshops/2005-montreal/PDF/Franks_ArupCaseStudies.pdf
No Shading: > 1,500,000 lux-hours
Overview and Introduction to DAYSIM and Current Research Developments 53 / 63Sept. 12, 2012
Museum Lighting Analysis by Arup Lighting
source: Matt Franks, Arup Lighting http://www.radiance-online.org/community/workshops/2005-montreal/PDF/Franks_ArupCaseStudies.pdf
Automated Shading System: 555,000 lux-hours
Overview and Introduction to DAYSIM and Current Research Developments 54 / 63Sept. 12, 2012
Complex Screen Analysis: New Jurong Christian Church
Overview and Introduction to DAYSIM and Current Research Developments 55 / 63Sept. 12, 2012
Complex Screen Analysis: New Jurong Christian Church
Percent Time with View
Percent Time with View
Percent Time with View
Percent Time with View
Percent Time with View
Percent Time with View
Percent Time with View
Percent Time with View
Percent Time with View Percent Time with View
Percent Time with View
Percent Time with View
Percent Time with View
Percent Time with View
glazing only
5cm punch screen only
bottom-hinged 30 degrees
top-hinged 30 degrees
inside-hinged 30 degrees
bottom-hinged 45 degrees
top-hinged 45 degrees
inside-hinged 45 degrees
bottom-hinged 60 degrees bottom-hinged 90 degrees
top-hinged 60 degrees
inside-hinged 60 degrees
top-hinged 90 degrees
inside-hinged 90 degrees
68
73
73
79
78
74
78
78
76 77
80
77
77
77
92
64
50
54
56
52
68
63
62 73
66
47
64
68
98
80
72
76
78
73
84
81
81 86
82
71
81
83
100
93
89
91
92
90
96
94
95 97
95
88
94
96
100
100
100
100
99
100
100
99
100 100
100
99
100
100 100
100
100
100
100
100
100
100
100
100 100
100
100
100
DA500lx
DA500lx
DA500lx
DA500lx
DA500lx
DA500lx
DA500lx
DA500lx
DA500lx DA500lx
DA500lx
DA500lx
DA500lx
DA500lx
DA300lx
DA300lx
DA300lx
DA300lx
DA300lx
DA300lx
DA300lx
DA300lx
DA300lx DA300lx
DA300lx
DA300lx
DA300lx
DA300lx
DA150lx
DA150lx
DA150lx
DA150lx
DA150lx
DA150lx
DA150lx
DA150lx
DA150lx DA150lx
DA150lx
DA150lx
DA150lx
DA150lx
DA50lx
DA50lx
DA50lx
DA50lx
DA50lx
DA50lx
DA50lx
DA50lx
DA50lx DA50lx
DA50lx
DA50lx
DA50lx
DA50lx
DA25lx
DA25lx
DA25lx
DA25lx
DA25lx
DA25lx
DA25lx
DA25lx
DA25lx DA25lx
DA25lx
DA25lx
DA25lx
DA25lx
Overview and Introduction to DAYSIM and Current Research Developments 56 / 63Sept. 12, 2012
Complex Screen Analysis: New Jurong Christian Church
Annual Radiation Map of a Single Panel
• We create a hourly shading coefficient by taking the ratio of the irradiance of a shaded window over the irradiance of an exposed window.
• A caveat is that thermal interaction between the screen and the window is neglected.
• Electric lighting energy is determined by simulated daylight dimming systems in DAYSIM and is used as a schedule input into EnergyPlus.
• Blinds are closed any time a student experiences direct light on their desk. They are only opened twice per day if conditions are comfortable.
Annual Irradiance (kWh/m2)
0 30024018012060
Overview and Introduction to DAYSIM and Current Research Developments
Overview and Introduction to DAYSIM and Current Research Developments 57 / 63Sept. 12, 2012
Percent Time with View
bottom-hinged 90 degrees
77
73 86 97 100 100
Calculated Screen Transmission Coefficients
Percent Time with View
5cm punch screen only
73
64 80 93 100 100DA500lx DA300lx DA150lx DA50lx DA25lx
Overview and Introduction to DAYSIM and Current Research Developments
Overview and Introduction to DAYSIM and Current Research Developments 58 / 63Sept. 12, 2012
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
kWh/
m-2
Lighting Ventilation Cooling
Percent Time with View
glazing only
68
92 98 100 100 100DA500lx DA300lx DA150lx DA50lx DA25lx
Lighting 6.28 kWh/m2
Ventilation 32.3 kWh/m2
Cooling 102.6 kWh/m2
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
kWh/
m-2
Lighting Ventilation Cooling
Percent Time with View
bottom-hinged 90 degrees
77
73 86 97 100 100DA500lx DA300lx DA150lx DA50lx DA25lx
Lighting 8.9 kWh/m2
Ventilation 21.4 kWh/m2
Cooling 77.5 kWh/m2
Thermal Simulation Results
Overview and Introduction to DAYSIM and Current Research Developments 59 / 63Sept. 12, 2012
A few closing comments...
Overview and Introduction to DAYSIM and Current Research Developments 60 / 63Sept. 12, 2012
DAYSIM Programs Hierarchy
Overview and Introduction to DAYSIM and Current Research Developments 61 / 63Sept. 12, 2012
Interior Gains CSV File For Interfacing with Thermal Simulations
ReferenceOffice_intgain.500lx detailed dynamic shading.xlsx
Overview and Introduction to DAYSIM and Current Research Developments
Overview and Introduction to DAYSIM and Current Research Developments 62 / 63Sept. 12, 2012
Go to DAYSIM.com for help, questions and to download.
Overview and Introduction to DAYSIM and Current Research Developments 63 / 63Sept. 12, 2012
Thank you.
Questions?
(followed by a demonstration time permitting)
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