Case Study

Skanska Evaluation Data

Evaluation of the Ultimate Power Cell fitted to a 60kVA Stage IIIA Generator


The Ultimate Power cell can be fitted to most engines. This unit introduces small quantities
of hydrogen into the engine’s air intake pipe, with the objective of optimizing fuel burn, and
acting as a combustion reaction catalyst. This optimised combustion will increase the engine’s
efficiency and reduce his environmental impact.

Such a unit was fitted to an Iveco FPT 60kVA generator operated by Skanska adjacent to a
M42 work site. The primary fuel used was Gd+ supplied by GBF. Over two days the emissions
from the engine were measured when running on Gd+ both with and without the hydrogen
injection into engine air intake.

Details of the trial

Gaseous emissions were measured using MGA Prime Q which is a portable gaseous emissions
measurement system with built-in data logger. It is TUV approved. The NDIR cell measures:
NO, NO2, SO2, CO2, CO, N2O, CH4 and C3H8 (HC). The Paramagnetic cell measures O2. CO2 and
O2 are measured as %, the rest are measured as ppm and mg/m3.

Measurements were taken at constant 30kW output (max output is 48kW). In the first period
(the baseline period) the hydrogen unit was off. Subsequently it was working at full capacity
(6 cells in operation) and then the unit was switched to normal operation with 3 cell active.
The unit was kept running overnight. On the second day the output was adjusted to 30kW,
and it ran for 22 minutes. After 22 minutes (at 9.15) an unidentified problem occurred.

PeriodTimeMinGd+UP (H2)
[# cells]
kW out
111:20-11:4222Y0B/L30Baseline – no H2 (UP system off)
212:30-14:3552Y6purge (ignore)30Purge period (12.43 to 14.30)
314:36-16:1094Y630Operational 6 cells
416:10-16:4131Y330Operational 3 cell
Day 2Ran o/n25o/n running + UP system 3 cell
508:52-09:1422Y3303 cell
Periods 1, 3, 4, and 5 are analysed in detail.

The measurements from all seven periods are shown in the appendix.

Guided by these graphs (shown in Appendix) the readings for each period were averaged,
avoiding outliers (mostly due to probe shifting position temporarily).

The average emissions are shown in Table 2

Table 2: Emissions of 60kW Generator with Gd+ and UP Hydrogen system

The results are shown graphically below.

Table 1: Changes in Emissions during Periods 1,3, 4, and 5 (marked as 0, 6, 3, and 3 on x-axis respectively)

The % difference relative to the baseline readings (Period 1) are shown in Table 2.

Table 2: % Difference in Emissions relative to Baseline


The increase in oxygen and decrease in carbon dioxide in the exhaust gases suggests that less
carbon containing fuel is being combusted.
The NOx emission appears to decrease to by 20-30% with H2 injection. The effect on methane
and CO is less clear.
These results are sufficiently interesting to warrant a detailed study in the engine test

Appendix. Seven period (see Table1) y-axis are the same throughout the periods.