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GB 32311-2015: Minimum allowable values of energy efficiency and energy efficiency grades for hydrogen producing systems by water electrolysis
GB 32311-2015
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.010
F 01
Minimum allowable values of energy efficiency and
energy efficiency grades for hydrogen producing
systems by water electrolysis
ISSUED ON: DECEMBER 10, 2015
IMPLEMENTED ON: JANUARY 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Technical requirements ... 5 
5 Test methods ... 6 
6 Inspection rules ... 7 
Appendix A (Normative) Calculate gas output by measured current value ... 8 
Appendix B (Normative) Calculation of specific energy consumption value ... 9 
Appendix C (Normative) Calculation of energy efficiency ... 11 
Minimum allowable values of energy efficiency and
energy efficiency grades for hydrogen producing
systems by water electrolysis
1 Scope
This Standard specifies the minimum allowable values of energy efficiency,
evaluating values of energy conservation, energy efficiency grades, test
methods, and inspection rules for hydrogen producing systems by water
electrolysis (hereinafter referred to as hydrogen producing systems).
This Standard applies to fixed or mobile hydrogen producing systems. The
structure of water electrolyser is bipolar, press-filtration, pressure type; the
output is ≥5 m3/h.
This Standard does not apply to atmospheric-pressure hydrogen producing
equipment by water electrolysis, small-scale hydrogen producing equipment
with an output < 5 m3/h, solid polymer electrolyte electrolyser (SPE), and
hydrogen-oxygen generator.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 19774 Specification of water electrolyte system for producing hydrogen
GB/T 24499 Technology glossary for gaseous hydrogen, hydrogen energy
and hydrogen energy system
3 Terms and definitions
The terms and definitions defined in GB/T 24499 and the following ones apply
to this document.
3.1 Specific energy consumption values for hydrogen producing systems
by water electrolysis
h.
5.7 Based on the measured DC current value and the number of cells of the
electrolyser, according to Appendix A, calculate the hydrogen output of
hydrogen producing systems.
5.8 Based on the measured DC voltage value and the number of cells of the
electrolyser, according to Appendix B, calculate the electrolyser’s average cell
voltage and unit DC energy consumption.
5.9 Based on the measured electric power for lye pump, make-up water pump,
and the control, according to Appendix B, calculate the unit AC energy
consumption of hydrogen producing systems.
The unit DC energy consumption plus the unit AC energy consumption obtains
the specific energy consumption values for hydrogen producing systems.
5.10 Based on the specific energy consumption values for hydrogen producing
systems, according to Appendix C, calculate the energy efficiency values for
hydrogen producing systems. According to Table 1, determine the energy
efficiency grades.
6 Inspection rules
6.1 The energy efficiency test of the product may be carried out at the
manufacturer or the user. If the measured value of energy efficiency meets the
specified requirements, it is regarded as a qualified product; otherwise it is
regarded as an unqualified product. The test of batch products of the same
model may be sampling inspection. If the requirements are not met, then
another 2 are taken for inspection. The measured values shall meet the
specified requirements. Otherwise, this batch of products is judged to be
unqualified.
6.2 The test of energy efficiency grade for the product shall be carried out before
the product’s commissioning and acceptance. When the user and the
manufacturer have objection to the test of energy efficiency grade for the
product, it may be arbitrated by a third-party professional institution with
relevant qualifications.
Appendix B
(Normative)
Calculation of specific energy consumption value
B.1 Calculation of specific energy consumption value W
The specific energy consumption value W consists of two parts, i.e. the DC unit
energy consumption value Wd and the AC unit energy consumption value Wa.
B.2 Calculation of DC unit energy consumption value Wd
B.2.1 According to the DC voltage U of the electrolyser and the number n of
electrolytic cells, according to the formula (B.1), calculate the average cell
voltage E of the electrolyser.
Where:
E - Average cell voltage, in volts (V);
U - The DC voltage of electrolyser, in volts (V);
n - Number of electrolytic cells.
Note: When the power-on mode is one positive and two negative (that is, the intermediate
electrode is connected to the anode; the electrode at both ends is connected to the
cathode), the number of electrolytic cells is halved.
B.2.2 The DC unit energy consumption value Wd is calculated according to
formula (B.2).
Where:
Wd - DC unit energy consumption value, in kilowatt hours per cubic meter (kW
• h/m3);
2390 - See Appendix A;
1000 - Conversion factor.