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ASHRAE Standard 155 2024

ASHRAE Standard 155 2024

$49.83

ASHRAE Standard 155-2024 — Method of Testing for Rating Commercial Space Heating Boiler Systems (ANSI Approved; AHRI Co-sponsored)

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ASHRAE 2024
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ANSI/ASHRAE/AHRI Standard 155 provides a method of test for rating commercial space heating boiler systems, with the objective of providing a means to determine the seasonal efficiency of individual, modular, and multiple boiler systems having various means of staging boilers to meet the building load, various boiler outlet (supply) or boiler inlet (return) water control strategies, and various pumping strategies, when applied, to meet the load of a particular building or prototype building in a particular climate. This standard provides test procedures and calculation procedures that allow a full performance map to be created for an individual boiler from the test results.

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PDF Pages PDF Title
1 ANSI/ASHRAE/AHRI Standard 155-2024
3 Contents
4 Foreword
1. Purpose
2. Scope
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.
5 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
3.1 Definitions
7 3.2 Nomenclature
11 4. Requirements
4.1 Types of Tests
12 4.2 Calculated Results
5. Instruments
15 6. Apparatus
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.
18 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
19 6.5 Application of Instruments (Steam and Water)
21 7. Test Conditions
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.
22 7.6 Steady-State Test Conditions, Steam and Water
23 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
24 7.10 Throughflow Loss Test Conditions, Water
25 8. Test Procedures
8.1 Steady-State Tests for Determining Efficiency and Output
8.2 Steady-State Combustion Efficiency Test
28 8.3 Idling Test
8.4 Throughflow Loss Test
29 9. Data to be Recorded
9.1 Combustion Efficiency Test
9.2 Idling Test
30 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
10.1 General Calculations
31 10.2 Combustion Efficiency Calculations
34 10.3 Jacket Loss, Lj, Percent
37 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…
39 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)
40 11. Calculation of Hot-Water Ratings from Steam Test Results
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…
43 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
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…
45 12.2 Steady-State Output as a Function of Boiler Inlet (Return) Water Temperature for a Fixed Input Rate and Water Flow Rate
47 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…
48 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
49 12.6 Part-Load Performance when Cycling Below the Minimum Steady-State Input Rate at a Fixed Flow Rate
50 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
51 12.8 Boiler Time Constant
52 13. Piping and Other Figures
62 14. References and Bibliography
63 Normative Appendix A: Correction Factors
64 Informative Appendix B: Forms for Recording Test Data
71 Informative Appendix C: Interpolation and Extrapolation of Test Results
72 C1. Steady-State Output as a Function of Water Flow Rate for Fixed Input Rate and Boiler Inlet Water Temperature
73 C2. Steady-State Output as a Function of Inlet Water Temperature for a Fixed Input Rate and Water Flow Rate
77 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
81 C6. Part-Load Performance When Cycling Below the Minimum Input Rating at Fixed Water Flow Rate and Fixed Outlet (or Inlet) Water Temperature
82 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
86 C8. Boiler Time Constant
90 Informative Appendix D: Guidance on Flue Gas Sampling for Excess Air Determination in Noncircular Ducts
92 Informative Appendix E: Informative References and Bibliography

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ASHRAE Standard 155 2024
$49.83