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ASHRAE Standard 155-2024 -- Method of Testing for Rating Commercial Space Heating Boiler Systems (ANSI Approved; AHRI Co-sponsored), 2024
- ASHRAE Online Bookstore
- Errata
- Addenda
- Return to Previous Page
- ANSI/ASHRAE/AHRI Standard 155-2024 [Go to Page]
- Contents
- Foreword
- 1. Purpose
- 2. Scope [Go to Page]
- 2.1 This standard applies to steam and hot-water boiler systems (individual, modular, or multiple boilers) for use in space heating applications and having individual boilers or modules with gas, oil, electric, or multiple fuel inputs of at least 300...
- 2.2 This standard provides methods to compare energy consumption measures of various boiler systems. It is not intended to provide an absolute measure of performance in any specific installation configuration.
- 2.3 This standard includes
- 2.4 This standard applies to the space heating performance of boiler systems used for multiple functions, including space heating.
- 2.5 This standard does not cover methods of testing boiler systems used only in service water heating applications.
- 3. Definitions and Nomenclature [Go to Page]
- 3.1 Definitions
- 3.2 Nomenclature
- 4. Requirements [Go to Page]
- 4.1 Types of Tests
- 4.2 Calculated Results
- 5. Instruments
- 6. Apparatus [Go to Page]
- 6.1 Test Room or Area. The test location must be a size that permits access to all parts of the test unit and instrumentation and that maintains stable ambient conditions. Provisions for removing the products of combustion from the test area and for ...
- 6.2 Vent Connection. Boilers for installation with either positive or negative pressure venting shall be tested with positive pressure venting following the requirements of Section 6.2.3.
- 6.3 Steam Piping. Figure 8 shows a diagram of a boiler setup. Size and install riser, header, and equalizer piping as specified in the manufacturer’s instructions shipped with the boiler. If risers and headers are required but are not specified in ...
- 6.4 Water Piping
- 6.5 Application of Instruments (Steam and Water)
- 7. Test Conditions [Go to Page]
- 7.1 General
- 7.2 Test Unit
- 7.3 Energy Source
- 7.4 Installation of Burners. The burner shall be installed in accordance with the manufacturer's instructions shipped with the boiler.
- 7.5 Input Rate. See Section 4.1.1.
- 7.6 Steady-State Test Conditions, Steam and Water
- 7.7 Additional Test Requirements for Water, Steady State
- 7.8 Additional Test Requirements for Steam, Steady State
- 7.9 Idling Test Conditions, Steam or Hot Water
- 7.10 Throughflow Loss Test Conditions, Water
- 8. Test Procedures [Go to Page]
- 8.1 Steady-State Tests for Determining Efficiency and Output
- 8.2 Steady-State Combustion Efficiency Test
- 8.3 Idling Test
- 8.4 Throughflow Loss Test
- 9. Data to be Recorded [Go to Page]
- 9.1 Combustion Efficiency Test
- 9.2 Idling Test
- 9.3 Throughflow Loss Test
- 9.4 Jacket Loss Test. The following items shall be measured during the jacket loss test:
- 10. Calculation of Rated Performance from Test Results [Go to Page]
- 10.1 General Calculations
- 10.2 Combustion Efficiency Calculations
- 10.3 Jacket Loss, Lj, Percent
- 10.4 Steady-State Thermal Output, q̇out,ss, Btu/h (kW)
- 10.5 Rated Steady-State Thermal Efficiency, Including Auxiliary Inputs, hss,thermal, Percent
- 10.6 Idling Test. The following items shall be calculated for each idling test required by Section 4.1 and for each optional idling test that is conducted. All data shall be for the test cycles only; stabilization cycles shall be excluded. All data s...
- 10.7 Throughflow Loss Rate. The following items shall be calculated for each optional throughflow loss test that is conducted. All data shall be for the test period only; the stabilization period shall be excluded.
- 10.8 Calculation of Boiler Water Mass Flow Rate during Steady-State Test, ṁrating, by Heat Balance, lb/h (kg/h)
- 11. Calculation of Hot-Water Ratings from Steam Test Results [Go to Page]
- 11.1 Steady-State Performance. The equations in this subsection shall be used to calculate the steady-state performance in hot-water mode for fuel-fired steam and hot-water boilers tested only in steam mode. For electric boilers, the rated steady-sta...
- 11.2 Idling Energy Input Rate. The equations in this subsection shall be used to calculate the idling performance in hot-water mode for steam and hot-water boilers tested only in steam mode.
- 11.3 Throughflow Loss Rate. If a steam and hot-water boiler is tested only in steam mode, the rated throughflow loss rate in hot-water mode shall be calculated using the method in Section 12.5.
- 12. Interpolation and Extrapolation of Test Results [Go to Page]
- 12.1 Steady-State Output as a Function of Water Flow Rate for a Fixed Input Rate and Boiler Inlet (Return) Water Temperature. The calculations in this section shall be used to compute the steady-state output as a function of water flow rate given tes...
- 12.2 Steady-State Output as a Function of Boiler Inlet (Return) Water Temperature for a Fixed Input Rate and Water Flow Rate
- 12.3 Idling Energy Input as a Function of Water Flow Rate for a Fixed Water Temperature. The idling energy input rate q̇in,idle shall be tested at the water flow rate used for the maximum input rating test and shall be assumed to be constant for a g...
- 12.4 Idling Energy Input as a Function of Water Temperature for a Fixed Water Flow Rate
- 12.5 Throughflow Loss Rate as a Function of Water Temperature
- 12.6 Part-Load Performance when Cycling Below the Minimum Steady-State Input Rate at a Fixed Flow Rate
- 12.7 Part-Load Performance when Modulating Between Tested Steady-State Input Rates at Fixed Outlet (Supply) or Inlet (Return) Water Temperature and with Fixed Water Flow Rate or Variable Flow Rate and Fixed Temperature Rise
- 12.8 Boiler Time Constant
- 13. Piping and Other Figures
- 14. References and Bibliography
- Normative Appendix A: Correction Factors
- Informative Appendix B: Forms for Recording Test Data
- Informative Appendix C: Interpolation and Extrapolation of Test Results [Go to Page]
- C1. Steady-State Output as a Function of Water Flow Rate for Fixed Input Rate and Boiler Inlet Water Temperature
- C2. Steady-State Output as a Function of Inlet Water Temperature for a Fixed Input Rate and Water Flow Rate
- C3. Idling Energy Input as a Function of Flow Rate for a Fixed Water Temperature
- C4. Idling Energy Input as a Function of Water Temperature for a Fixed Water Flow Rate
- C5. Throughflow Loss Rate as a Function of Water Temperature for a Fixed Water Flow Rate
- C6. Part-Load Performance When Cycling Below the Minimum Input Rating at Fixed Water Flow Rate and Fixed Outlet (or Inlet) Water Temperature
- C7. Part-Load Performance when Modulating Between Minimum Input Rating and Maximum Steady-State Input Rate at Fixed Outlet (or Inlet) Water Temperature and with Fixed Water Flow Rate or Variable Water Flow Rate with Fixed Temperature Rise
- C8. Boiler Time Constant
- Informative Appendix D: Guidance on Flue Gas Sampling for Excess Air Determination in Noncircular Ducts
- Informative Appendix E: Informative References and Bibliography [Go to Page]
