[esp-r] Re: Is there any model about lighting,illuminance

[Jon Hand]

I copied a section from the ESP-r Cookbook on the capabilities of
ESP-r which gives an overview of daylighting in ESP-r.  Essentially
you can assess daylighting via many different methods including
a simple split-flux method all the way to invoking Radiance at each
timestep and controlling lighting on the radiation falling on points
in the room.

There is not yet a section in the Cookbook that talks about lighting
control in ESP-r.  Within the ESP-r interface the facilities to describe
lighting controls are in the zone casual gain control menu.

18.3  Building envelope and day-lighting

This sections is an overview of the treatment of
solar radiation outside a building as well as its
distribution within and between zones. Outside
surface conduction is also discussed.

The default treatment is to assume no shading and that
the distribution of insolation is diffusely distributed
within a room. If there are external sources of shading
these are represented as opaque non-reflective block shapes. Shading
calculations (direct and diffuse) are done for each
hour on a typical day of each month. Diffuse shading
can be based on isotropic or anistropic sky conditions.

Insolation distribution (including radiation
falling on internal mass surfaces) can also be
predicted at each hour on a typical day of each month.

Beam solar radiation is tracked to first absorption and
then diffusely distributed. Solar radiation passing into
adjacent zones is treated as a diffuse source. Solar
radiation passing out through a facade is assessed.

Optical data on transmission and absorption at five
angles is typically used and can be imported from Window 5.1
or 5.2. Data from WIS requires additional editing. Bidirectional
optical properties and control is supported for those with
experimental data.

Seasonal adaptation of shading devices requires separate
models, each pointing to obstruction descriptions for that season.

Optical properties can be switched based on a range of
criteria (the number of layers is required to be constant).
There is a facility to substitute an alternative construction
as well as alternative optical properties. The requirement
for a constant number of layers poses a challenge for
the representation of movable blinds and shutters.

Day-lighting control can be based on split-flux method, user
defined daylight factors or time-step use of the Radiance
visual simulation suite to compute lux on a sensor. Multiple
circuits can be treated in each thermal zone.

Some users choose to explicitly represent opaque blinds as
sets of surfaces. In the case of blinds between glass this
is often approached by treating the blind as a layer with
the construction which has optical properties approximating
the transmission through the slats and openings. If the
optical properties of this layer are switched then the
absorption characteristics of the blind layer change
(as does the thermal state of the construction).

Conduction is typically represented in 1D but can be
switched to 2D and 3D (the input data requirements
increase considerably).

________________________________________
From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] On Behalf Of 李志英 [lzytongji at yahoo.com.cn]
Sent: 22 July 2009 12:38
To: esp-r at lists.strath.ac.uk
Subject: [esp-r]  Is there any model about lighting,illuminance

Hi,

    Anybody help me to find some model about lighting,illuminance in ESP-r?

Thanks,
Teresa


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