ISO 19467:2017 download free.Thermal performance of windows and doors — Determination of solar heat gain coefficient using solar simulator.
The terms solar heat gain coefficient (SHGC). total solar energy transmittance (TSET). solar factor and g-value are all used to describe the same quantity. Small differences might be caused by different reference conditions (e.g. differences in the reference solar spectrum). In ISO 19467, solar heat gain coetilcient is used.
ISO 19467 Is designed to provide solar heat gain coefficient values by standardized measurement method and to enable a fair comparison of different products. It specifies standardized apparatus and criteria. The solar heat gain coefficient measuring apparatus applied In ISO 19467 Includes solar simulator, climatic chamber, and metering box. Solar heat gain coefficient values of windows and doors with or without shading devices shall be determined more precisely by means of combination between calculation and rneasurenient.
ISO 19467 does not deal with the centre of glazing solar heat gain coefficient measurement. However, the centre of glazing solar heat gain coefficient can be measured by either this method or cooled plate method (see Reference 1121).
1 Scope
ISO 19467 specifies a method to measure the solar heat gain coefficient of complete windows and doors.
v applies to windows and doors
a) with various types of glazing (gbss or plastic; single or multiple glazing; with or without low emissivity coatings, and with spaces filled with air or other gases).
b) with opaque panels.
c) with various types of frames (wood, plastic, metallic with and without thermal barrier or any combination of materials),
d) with various types or shading devices (blind, screen, film or any attachment with shading effects),
e) with various types of active solar fenestration systems Ibuilding integrated PV systems (BIPV) or buildlng4ntegrated solar thermal collectors (81ST)).
This document does not include the following:
a) shading effects of building elements (e.g. eaves, sleeve wall, etc.);
b) heat transfer caused by air leakage between Indoors and outdoors;
c) ventilation of air spaces In double and coupled windows;
d) thermal bridge effects at the rebate or IoInL between the window or door frame and the rest of the building envelope.
ISO 19467 does not apply to the following:
a) non-vertical windows;
b) curtain walls;
c) industrial, commercial and garage doors.
2 Normative references
The following documents are referred to In the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (Including any amendments) applies.
ISO 9050. Glass En building — Determination of light transmittance, solar direct transmittance, total solar energy transmittance, ultraviolet transmittance and related glazing factors
ISO 9845-1. Solar energy — Refrreoce solar spectral irradiance at the ground at different receiving conditions — Part 1: Direct normal and hemispherical solar irradiance for air mass 1.5
ISO 12567-1, Thermal performance of windows and doors — Determination of thermal transmittance by the hot-box method — Part 1: Complete windows and doors
6.1.2 Summary olthc test apparatus
The measuring apparatus can be summarized as follows.
a) Light emitted by the solar simulator passes through the transparent aperture and is then directed towards the test specimen. The light passing through the test specimen is absorbed by the cooling device.
b) The transparent aperture Is installed In the climatic chamber in order to allow the light from the solar simulator to pass through to the test specimen.
c) The external airflow generator and the external side baffle with transparency may be installed in the climatic chamber in order to adjust the external surface coefficient of heat transfer and environmental external temperature.
d) The cooling device Is installed opposite the test specimen in the metering box in order to remove the solar heat gain and the thermal transmission that has entered the metering box.
e) The heating device and the internal side baffle with transparency may be installed in the metering box In order to adjust the Internal surface coeffIcient of heat transfer and environmental Internal temperature.
f) One or more internal fans may be installed in the metering box in order to stir the internal air to obtain a uniform temperature distribution and/or to adjust the internal surface coefficient of heat transfer.
g) All of the heat flow rates passing through the metering box are measured by the heat flow measuring device in order to determine the net heat flow rate through the test specimen.
h) All the walls and the floor shall be covered with the coating of solar reflectance of 0,05 or lower in order to avoid stray light.
6.2 Solar simulator
A 5teady-state solar simubtor shall be used, which meets with the following requirements.
a) Spectral match of the irradiance: The spectral match of the irradiance on the test plane is defined by the deviation from the global reference solar spectral Irradlance for air mass 1,5 In accordance with ISO 9845-1. For nine wavelength ranges, the percentage of total irradiance is specified in Table L The spectral match to all wavelength ranges specified In Table 1 shall be measured In accordance with IF.C 60904-9 and shall be within 0.55 to 1,45. Examples of spectral match of solar simulator are shown in Table Di.
b) Non-uniformity of the irradiance: The non-uniformity of the Irradiance on the test plane shall be measured in accordance with IEC 60904-9 and shall be within 5 %. However, the designated test area shall be dwided into at least 16 points, alternatively.
c) Temporal instability of the irradiance: Temporal instability of the irradiance on the test plane shall be measured by the procedure for long term instability (LTI) in accordance with IEC 60904-9 and shall be within 5%.
d) Maximum angle of irradiance: The maximum angle of irradiance to the test specimen shall be within 100.
e) Area of effective lrradiance: The width and height of the area of effective irradiance shall be 100% or greater than each dimension of the test specimen width, W,, and height. H1,.
6.3 ClimatIc chamber
The climatic chamber is constructed of the following: a transparent aperture, an external airflow generator, an external side baffle (optional), and the surround panel aperture. It maintains the environmental external conditions (see Eigurc3).
a) Transparent aperture: The transparent aperture Is installed in order to allow the light from the solar simulator to pass through the climatic chamber to the test specimen. The transparent aperture shall be made from high-transmittance glass specified as follows:
I) the solar transmittance of each glass pane according to ISO 9050 shall be 880% or higher
2) the difference between the maximum and minimum value of the spectrum transmittance according to ISO 9050:2003, Table 2 wIthin a range of 380 nm to 2 100 nm shall be 0.050 or lower.
b) External airflow generator: The external airflow generator is installed in order to maintain the external surface coefficient of heat transfer on the test specimen. The airflow shall be parallel to the test specimen and the surround panel. The appropriate air speed shall be set to maintain the external surface coefficient of heat transfer.
c) External side baffle (optional): The external side baffle with transparency may be installed In order to form and maintain the environmental external conditions between the test specimen and the surround panel. The external side baffle is very useful to set up the environmental external conditions. More details are presented In Iso 12567-1. In this case, the environmental temperature may be considered as the aLr temperature. The external side baffle shall be made from high- transmittance glass.
6.4 Metering box
The metering box is constructed from the following a cooling device, an internal side baffle (optional). one or more internal fans (optional), and a heating device (optional). It maintains the environmental internal conditions (see Figure 3).
The appropriate heat flow measuring devices such as heat flow meter and so forth shall be used in order to measure all of the heat flow rates passing through the metering box.
a) Cooling device: The cooling device is installed opposite to the test specimen in order to remove all the heat entering the metering box. The surface of the cooling device shall have a solar absorptance of 0,90 or greater and have a matte finished to maximize heat absorption. The heat flow meters or the calorimeter may be used as the heat flow measuring device. The refrigerant set a temperature lower than environmental internal temperature, is circulated over the rear surface of the cooling device. Environmental internal temperature is controlled by either the heating device, the inlet temperature of the refrigerant or the volumetric flow rate of the refrigerant or by a combination of these three.