SA/SNZ MP 104:2021
Modelling of heated water systems in accordance with AS/NZS 4234:2021, using TRNSYS
Miscellaneous publication provides software tools to support the application of AS/NZS 4234:2021, heated water systems - Calculation of energy consumption, for evaluating the annual energy performance of water heaters, to determine the standardized annual purchased energy use. Note: This miscellaneous publication is accompanied by additional files for use with 3rd party software. KEYWORDS: Heated water systems; calculation of energy consumption; electric storage water heaters; gas storage water heaters; solar water heaters; solar preheaters; solar‐boosted heat pump water heaters; transient system simulation program
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SA/SNZ MP 104:2021 Modelling of heated water systems in accordance with AS/NZS 4234:2021, using TRNSYS
Preface
Section 1 Scope and general
1.1 Scope
1.2 Application
1.3 Normative references
1.4 Terms and definitions
Section 2 Performance evaluation
2.1 General
2.2 TRNSYS deck examples
2.3 TRNSYS source code
2.4 Nonlinear solar collector efficiency characterization
2.5 Incidence angle modifier
2.5.1 General
2.5.2 Symmetric collectors
2.5.3 Data table of incidence angle modifier values
2.5.4 Collectors with north–south and east–west symmetry
2.5.5 Incidence angle modifier map
2.5.6 Collectors with east–west symmetry only
2.6 Collector configuration
2.6.1 General
2.6.2 Collector heat removal via heat pipe
2.6.3 Thermosiphon systems with collector loop heat exchanger
2.6.4 Serpentine riser solar collector
2.6.5 Thermal cut-off valve in the thermosiphon loop
2.7 Storage tank options
2.7.1 Over-temperature relief valve
2.7.2 One-shot boosting
Section 3 TRNSYS modelling
3.1 General
3.2 Deck layout
3.3 Simulation results
3.3.1 Annual performance output
3.3.2 Energy balance
3.3.3 Runtime graph
3.4 Solar collector area
3.5 Default maximum tank temperature settings for collector loop pump controller
3.6 Piping models
3.6.1 Dip tubes
3.7 Instantaneous gas heater modelling
3.8 PV powered water heater modelling
3.9 Thermal stratification in storage tanks
3.9.1 Pumped circulation loops
3.9.2 Measurement and documentation of pump flow rate and power
3.9.3 Controller cycling and simulation stability
3.10 TRNSYS modelling parameters for thermosyphon solar water heaters
3.10.1 General
3.10.2 Thermosiphon flow restriction valves
3.11 Legionella control
3.12 Calibration of heat pump parameters against test data
3.12.1 General
3.12.2 Integral heat pump condenser temperature difference
3.12.3 Low temperature operation penalty factor
3.13 Units
3.14 Rounding of numerical results
3.15 Batch execution of TRNSYS rating calculations
Section 4 Sample input files for use with TRNSYS
4.1 General
4.2 Climate zone Include files
Bibliography
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References
Test methods for solar collectors - Thermal performance of glazed liquid heating collectors including pressure drop
Solar and heat pump water heaters - Design and construction
Heat pump water heaters - Performance assessment - Part 1: Air source heat pump water heaters
Related Information
Similar Standards
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AS/NZS 3598.1:2014
Energy audits - Part 1: Commercial buildings -
AS/NZS 3598.2:2014
Energy audits - Part 2: Industrial and related activities -
AS/NZS 3598.3:2014
Energy audits - Part 3: Transport related activities -
AS/NZS 4234 Sup 1:2021
Heated water systems - Calculation of energy consumption-Parameters and outcomes for software simulations (Supplement to AS/NZS 4234:2021)
SA/SNZ MP 104:2021 Modelling of heated water systems in accordance with AS/NZS 4234:2021, using TRNSYS
Preface
Section 1 Scope and general
1.1 Scope
1.2 Application
1.3 Normative references
1.4 Terms and definitions
Section 2 Performance evaluation
2.1 General
2.2 TRNSYS deck examples
2.3 TRNSYS source code
2.4 Nonlinear solar collector efficiency characterization
2.5 Incidence angle modifier
2.5.1 General
2.5.2 Symmetric collectors
2.5.3 Data table of incidence angle modifier values
2.5.4 Collectors with north–south and east–west symmetry
2.5.5 Incidence angle modifier map
2.5.6 Collectors with east–west symmetry only
2.6 Collector configuration
2.6.1 General
2.6.2 Collector heat removal via heat pipe
2.6.3 Thermosiphon systems with collector loop heat exchanger
2.6.4 Serpentine riser solar collector
2.6.5 Thermal cut-off valve in the thermosiphon loop
2.7 Storage tank options
2.7.1 Over-temperature relief valve
2.7.2 One-shot boosting
Section 3 TRNSYS modelling
3.1 General
3.2 Deck layout
3.3 Simulation results
3.3.1 Annual performance output
3.3.2 Energy balance
3.3.3 Runtime graph
3.4 Solar collector area
3.5 Default maximum tank temperature settings for collector loop pump controller
3.6 Piping models
3.6.1 Dip tubes
3.7 Instantaneous gas heater modelling
3.8 PV powered water heater modelling
3.9 Thermal stratification in storage tanks
3.9.1 Pumped circulation loops
3.9.2 Measurement and documentation of pump flow rate and power
3.9.3 Controller cycling and simulation stability
3.10 TRNSYS modelling parameters for thermosyphon solar water heaters
3.10.1 General
3.10.2 Thermosiphon flow restriction valves
3.11 Legionella control
3.12 Calibration of heat pump parameters against test data
3.12.1 General
3.12.2 Integral heat pump condenser temperature difference
3.12.3 Low temperature operation penalty factor
3.13 Units
3.14 Rounding of numerical results
3.15 Batch execution of TRNSYS rating calculations
Section 4 Sample input files for use with TRNSYS
4.1 General
4.2 Climate zone Include files
Bibliography
SA/SNZ MP 104:2021
Online Library subscription pricing
The cost of your subscription will depend on which standards you want to access, and how many people in your organisation need to be able to access the Online Library subscription at the same time (concurrent users). During your subscription period, we are also able to make any necessary changes and ensure you are aware of any pricing changes that result. For a quote, contact our Online Library team by emailing onlinelibrary@standards.govt.nz.