Document ID: chunk:federal_register_of_legislation:F2022C00033:reg:9:p7
Version: federal_register_of_legislation:F2022C00033
Segment Type: reg
Provision Reference: reg 9 (pt 7/9)
Character Range: 39593–42742

out for the specific collector array size or recirculation loops that are specified for the product.
     Measurements or calculations for products with variable flow rate shall cover the full range of operating conditions.
     A report must be prepared setting out the measurement or calculation of pump flow rate and power. The report must include:
         i. a description of product configuration tested, including collector model, number of collectors, series or parallel connection, pump model, piping length and diameter; and
         ii. a detailed description of the measurement or calculation procedure used, including schematic diagram or photograph of setup; and
         iii. (if measured rather than calculated) measuring equipment used; and
         iv. (if measured rather than calculated) results for flow rate and pump electrical power input.
 The Clean Energy Regulator has published a procedure that may be used to calculate pump flow rate and power consumption for large SWHs, titled Guide for Calculating Pump Flow Rate and Power Consumption for Large Solar Water Heaters. For the avoidance of doubt, use of the procedure is not mandatory.
Note:  The guide could in December 2016 be viewed on the Clean Energy Regulator's website (http://www.cleanenergyregulator.gov.au/RET/Pages/Forms and resources/Forms-and-resources-for-manufacturers.aspx).

Division D - Notes

Pump cycling and simulation stability
 For pumped SWHs the pump controller may cycle the pump on/off if the ratio Ton/Toff is too small.  See Duffie & Beckman, "Solar Engineering of Thermal Processes", Section 10.4 Controls for more detail [1] and how to calculate the required Ton/Toff ratio to avoid pump cycling.
 Modelling an in-tank coil heat exchanger for the solar circulation loop using the Type 60 tank model can lead to convergence problems in TRNSYS 15, particularly for glycol-water mixtures. Using water as the HX fluid instead and/or artificially increasing the collector flow rate may overcome this problem. Changing the heat transfer fluid and/or flow rate will introduce an error, and the increase in flow rate should be kept as small as possible.
Batching multiple TRNSYS rating Calculations

     Running multiple TRNSYS decks can be automated by using a Windows batch file.  For example, four decks (deckfilenameZ1 to deckfilenameZ4) can be run successively by writing the following lines into a Notepad file (note the spaces) and saving the file with .bat extension.

         C:\Trnsys15\trnsys.exe deckfilenameZ1.dck /N
         C:\Trnsys15\trnsys.exe deckfilenameZ2.dck /N
         C:\Trnsys15\trnsys.exe deckfilenameZ3.dck /N
         C:\Trnsys15\trnsys.exe deckfilenameZ4.dck /N

    Right-clicking the batch file allows to one to edit it, left clicking or double clicking will run it.
References

    [1] Duffie, J. A. and Beckman, W. A., Solar Engineering of thermal processes, 3rd ed., Wiley, New York, 2006.

Endnotes

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The endnotes provide information about this compilation and the compiled law.

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