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therapy
Posts: 11
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 Posted: Wed Mar 29, 2006 6:47 pm Post subject: Electrochromic glazing |
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| How to implement electrochromic glazing in building envelope? Which state should I choose: Bleached or Colored? |
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Andy Tindale
Posts: 1198
Location: Stroud |
| Posted: Fri Mar 31, 2006 5:35 pm Post subject: |
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To model electrochromic glazing in DesignBuilder follow these steps:
1. Specify the glazing type to be used when the electrochromic glazing system is clear (bleached) in the standard way on the Openings tab under External glazing.
2. Under External Glazing and Shading headers, check the 'Window shading' option.
3. Select the Type as 'Electrochromic absorptive 6mm' (for example).
4. Select the Position as 4-Switchable.
5. The Shading Type defines the pane which is to be used in place of the standard outer
glazing pane according to the control data in the Control type.
6. Set the Control type together with any supplementary set point data.
I hope this answers your question.
There will be improved online help on using electrochromic glazing in the next version of the software.
Regards
Andy |
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therapy
Posts: 11
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| Posted: Wed Apr 26, 2006 1:43 pm Post subject: |
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Thanks for answering. I have another question: When I'm choosing glazing set to use with electrochromic glazing can I choose anything like :
Dbl Clr 3mm/13mm Air
Trp Clr 3mm/13mm Air
or should I choose Bleached mode glazing like:
Dbl Elec Abs Bleached 6mm/13mm Air
Dbl Elec Ref Bleached 6mm/6mm Air?
Regards
Lukasz |
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Andy Tindale
Posts: 1198
Location: Stroud |
| Posted: Thu Apr 27, 2006 5:02 pm Post subject: |
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Lukasz,
You can use any glazing as the base "Bleached mode" glazing type. We normally recommend using Bleached mode glazing like:
Dbl Elec Abs Bleached 6mm/13mm Air
Dbl Elec Ref Bleached 6mm/6mm Air
Because the transmission properties have been specifically derived from real electrochromic glazing in bleached mode.
Regards
Andy |
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therapy
Posts: 11
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| Posted: Sun Oct 15, 2006 8:42 pm Post subject: Electrochromic glazing control types |
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I cannot find it in Help.So do I proper interpret these control types:
1.Summer (all summer ON?)
2.Inside air temperature (if above specified air temperature then ON?)
3.Cooling (ON when air conditioning is working?)
4.Solar (if above specified solar radiation W/m2 then ON) - but on which surface? (horizontal or on the glazing)
5.Day cooling and Solar + Night (no idea)
Regards
Lukasz |
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Andy Tindale
Posts: 1198
Location: Stroud |
| Posted: Sun Oct 15, 2006 10:56 pm Post subject: |
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Here is the current help text on shading control. Note that option 3 has changed from 'Summer' to 'Scheduled' in version 1.2.
| V.1.2 Online Help wrote: | The choices for Shading control type are the following. Equivalent EnergyPlus control types are shown in italics. If SetPoint is applicable its units are shown in parentheses.
1- Always on (AlwaysOn) - Shading is always on.
The following six control types are used primarily to reduce zone cooling load due to window solar gain.
2-Daylight (MeetDaylightIlluminanceSetpoint) - Used only with Position = 4-Switchable in zones with daylighting controls. In this case the transmittance of the glazing is adjusted to just meet the daylight illuminance set point at the first daylighting
reference point. Note that the daylight illuminance set point is specified under Environmental Control on the Activity tab.
3-Schedule - Shading operation is defined by a schedule.
4-Solar (OnIfHighSolarOnWindow) - Shading is on if beam plus diffuse solar radiation incident on the window exceeds SetPoint (W/m2 or BTU/hr-ft2).
5-Glare (OnIfHighGlare) - Shading is on if the total daylight glare index at the zone’s first daylighting sensor from all of the exterior windows in the zone exceeds the maximum glare index specified in the daylighting input for zone.
Note: Glare control requires Lighting control to be switched on in the zone.
6-Outside air temp (OnIfHighOutsideAirTemp) - Shading is on if outside air temperature exceeds SetPoint (C).
7-Inside air temp (OnIfHighZoneAirTemp) - Shading is on if zone air temperature in the previous time step exceeds SetPoint (C or F)
8-Cooling (OnIfHighZoneCooling) - Shading is on if zone cooling rate in the previous time step is non-zero.
The following two control types can be used to reduce zone cooling load. They are applicable to any Shading type but are most appropriate for interior or exterior
blinds, interior or exterior shades with low insulating value, or switchable glazing.
9-Day cooling and solar + night (OnNight/OnDayIfCoolingAndHighSolarOnWindow) - Shading is on at night. Shading is on during the day the solar radiation incident on the window exceeds SetPoint (W/m2 or BTU/hr-ft2) and if the zone cooling rate in the previous time step is non-zeo.
10-Day cooling and solar (OffNight/OnDayIfCoolingAndHighSolarOnWindow) - Shading is off at night. Shading is on during the day when the solar radiation incident on the window exceeds SetPoint (W/m2 or BTU/hr-ft2) and if the zone cooling rate in the previous time step is non-zeo.
The following three control types can be used to reduce zone heating load during the winter by reducing window conductive heat loss at night and leaving the window unshaded during the day to maximize solar gain. They are applicable to any Shading Type but are most appropriate for interior or exterior shades with high insulating value ("movable insulation"). “Night” means the sun is down and “day” means the sun is up.
11-Night outside low air temp (OnNightIfLowOutsideTemp/OffDay) - Shading is on at
night if the outside air temperature is less than SetPoint (C) and schedule, if specified, allows shading. Shading is off during the day.
12-Night inside low air temp (OnNightIfLowInsideTemp/OffDay) - Shading is on at night if the zone air temperature in the previous time step is less than SetPoint (C) and schedule, if specified, allows shading. Shading is off during the day.
13-Night heating (OnNightIfHeating/OffDay) - Shading is on at night if the zone heating rate in the previous time step exceeds SetPoint (W) and schedule, if specified, allows shading. Shading is off during the day.
The following two control types can be used to reduce zone heating and cooling load. They are applicable to any Shading type but are most appropriate for translucent interior or exterior shades with high insulating value ("translucent movable insulation").
14-Night outside low air temp + day cooling (OnNightIfLowOutsideTemp/OnDayIfCooling)
- Shading is on at night if the outside air temperature is less than Set point (C or F). Shading is on during the day if the zone cooling rate in the previous time step is non-zero.
15-Night heating + day cooling (OnNightIfHeating/OnDayIfCooling) - Shading is on
at night if the zone heating rate in the previous time step is non-zero. Shading is on during the day if the zone cooling rate in the previous time step is non-zero.
SetPoint
The setpoint for activating window shading. The units depend on the type of trigger:
W/m2 or BTU/hr-ft2 for solar-based controls
C or F for temperature-based controls |
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therapy
Posts: 11
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| Posted: Mon Oct 16, 2006 11:32 pm Post subject: |
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Thanks,
Two more questions to go: 
Note that option 3 has changed from 'Summer' to 'Scheduled' in version 1.2. Is it the same, just changed name? Where can I set hours that EC glazing is ON?
3-Schedule - Shading operation is defined by a schedule. Where can I set this schedule? Is it Activity ->Occupancy? |
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Andy Tindale
Posts: 1198
Location: Stroud |
| Posted: Tue Oct 17, 2006 1:22 pm Post subject: |
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The new option 3 has changed behaviour from version 1.1 to 1.2. When you select option 3 you will see that you can define the schedule immediately below the option.
You will need to download and install DesignBuilder version 1.2 beta release from the website to access this.
Regards,
Andy |
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