UEi Test Instruments KM9106/P - Manual (Page 21)

KM9106 Operators Manual 21
To Set A User Fuel:
If one of the standard fuels does not approximate to the one you are using in your
boiler then it is possible to set the Quintox up for a USER FUEL. The information
required to be able to set this are the Chemical Breakdown of the fuel and the Gross
and Nett calorific value. Details of the calculation are shown in the Appendix.
SET
K1g 0.350
K2 11.89
K4 32 K1n 0.393
K3 9.83
O2r 3.0
Parameter
Controls Options
USER FUEL: Set each number as date using or
key and
0 - 9
TIP: If you enter this routine in error, ENTER past all of the numbers to
exit.
Check fuel set by pressing NATURAL GAS
K1g 0.350
K2 11.89
K4 32 K1n 0.393
K3 9.83
O2r 3.0
6.3 Gross or Net Efficiency
The Quintox can calculate efficiency in of one of two ways.
Efficiency = 100% - Losses. See the Appendix for the Efficiency calculation.
•
Gross efficiency uses the gross calorific value of the fuel and deems that the
latent heat of vapourisation is lost up the flue of the boiler and is taken as a loss.
Gross is used in the UK and USA.
• Net Efficiency uses the net calorific value and assumes the latent heat is not lost
up the flue. For Natural gas this efficiency can be 11% higher than the Gross
figure. Net is used in France and Germany.
NOTE: Latent heat is the heat required to turn water at 100
°C into steam at
100 °C, i.e. a change of state from liquid to vapour without rise in
temperature has taken place.
ENTER
FUEL