ISO 9459-5:2007 Solar heating - Domestic water heating systems - Part 5: System performance characterization by means of whole-system tests and computer simulation
International Organization for Standardization (ISO)
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ISO 9459-5:2007
Scope
This part of ISO 9459 specifies a method for outdoor laboratory testing of solar domestic hot-water (SDHW)
systems. The method may also be applied for in-situ tests, and also for indoor tests by specifying appropriate
draw-off profiles and irradiance profiles for indoor measurements. The system performance is characterized
by means of whole-system tests using a 'black-box' approach, i.e. no measurements on the system
components or inside the system are necessary. Detailed instructions are given on the measurement
procedure, on processing and analysis of the measurement data, and on presentation of the test report.
The theoretical model described in reference [1] is used to characterize SDHW system performance under
transient operation. The identification of the parameters in the theoretical model is carried out by a parameteridentification
software program (see Annex A). The program finds the set of parameters that gives the best fit
between the theoretical model and the measured data.
A wide range of operating conditions shall be covered to ensure accurate determination of the system
parameters. Measured data shall be pre-processed before being used for identification of system parameters.
The identified parameters are used for the prediction of the long-term system performance for the climatic and
load conditions of the desired location, using the same model as for parameter identification. The system
prediction part of the theoretical model requires hourly values of meteorological data (e.g. test reference
years) and specific load data, as described in Annex C.
This part of ISO 9459 can be applied to the following SDHW systems including:
a) systems with forced circulation of fluid in the collector loop;
b) thermosiphon systems;
c) integral collector storage (ICS) systems;.
provided that for b) and c) the validation requirements described in Clause B.2 of Annex B are satisfied.
Systems are limited to the following dimensions1).
- The collector aperture area of the SDHW system is between 1 and 10 m2.
- The storage capacity of the SDHW system is between 50 and 1 000 litres.
- The specific storage-tank volume is between 10 and 200 litres per square metre of collector aperture area.
ISO 9459-5:2007 Referenced Document
ISO 9060 Solar energy — Specification and classification of instruments for measuring hemispherical solar and direct solar radiation*, 2018-11-14 Update
ISO 9459-1 Solar heating; domestic water heating systems; part 1: performance rating procedure using indoor test methods
ISO 9459-2 Solar heating - Domestic water heating systems - Part 2: Outdoor test methods for system performance characterization and yearly performance prediction of solar-only systems
ISO 9846 Solar energy; calibration of a pyranometer using a pyrheliometer
ISO 9459-5:2007 history
2007ISO 9459-5:2007 Solar heating - Domestic water heating systems - Part 5: System performance characterization by means of whole-system tests and computer simulation