# Commission Regulation (EU) 2017/1151 of 1 June 2017 supplementing Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information, amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) No 1230/2012 and repealing Commission Regulation (EC) No 692/2008 (Text with EEA relevance), Division 6.13


Fuel consumption for a vehicle with a positive ignition engine fuelled by hydrogen:
FC=0,024×Vd×1Z1×p1T1−1Z2×p2T2For vehicles fuelled either with gaseous or liquid hydrogen, and with approval of the approval authority, the manufacturer may choose to calculate fuel consumption using either the equation for FC below or a method using a standard protocol such as SAE J2572.
FC=0,1×0,1119× H2O+ H2The compressibility factor, Z, shall be obtained from the following table:
Table A7/2
Compressibility factor Z
T (K)
5
100
200
300
400
500
600
700
800
900
p (bar)
33
0,859
1,051
1,885
2,648
3,365
4,051
4,712
5,352
5,973
6,576
53
0,965
0,922
1,416
1,891
2,338
2,765
3,174
3,57
3,954
4,329
73
0,989
0,991
1,278
1,604
1,923
2,229
2,525
2,810
3,088
3,358
93
0,997
1,042
1,233
1,470
1,711
1,947
2,177
2,400
2,617
2,829
113
1,000
1,066
1,213
1,395
1,586
1,776
1,963
2,146
2,324
2,498
133
1,002
1,076
1,199
1,347
1,504
1,662
1,819
1,973
2,124
2,271
153
1,003
1,079
1,187
1,312
1,445
1,580
1,715
1,848
1,979
2,107
173
1,003
1,079
1,176
1,285
1,401
1,518
1,636
1,753
1,868
1,981
193
1,003
1,077
1,165
1,263
1,365
1,469
1,574
1,678
1,781
1,882
213
1,003
1,071
1,147
1,228
1,311
1,396
1,482
1,567
1,652
1,735
233
1,004
1,071
1,148
1,228
1,312
1,397
1,482
1,568
1,652
1,736
248
1,003
1,069
1,141
1,217
1,296
1,375
1,455
1,535
1,614
1,693
263
1,003
1,066
1,136
1,207
1,281
1,356
1,431
1,506
1,581
1,655
278
1,003
1,064
1,130
1,198
1,268
1,339
1,409
1,480
1,551
1,621
293
1,003
1,062
1,125
1,190
1,256
1,323
1,390
1,457
1,524
1,590
308
1,003
1,060
1,120
1,182
1,245
1,308
1,372
1,436
1,499
1,562
323
1,003
1,057
1,116
1,175
1,235
1,295
1,356
1,417
1,477
1,537
338
1,003
1,055
1,111
1,168
1,225
1,283
1,341
1,399
1,457
1,514
353
1,003
1,054
1,107
1,162
1,217
1,272
1,327
1,383
1,438
1,493
In the case that the required input values for p and T are not indicated in the table, the compressibility factor shall be obtained by linear interpolation between the compressibility factors indicated in the table, choosing the ones that are the closest to the sought value.

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Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/7/division/division/6./division/6.13. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/7/division/division-6./division-6.13.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.