GE DMC490 Software Configuration Manual page 35

Electric Specify the maximum electric power generation capacity of the co-
Rated Power generator in kW. It is the maximum potential power contribution of
(kW) the co-generator in the microgrid.
Electric Specify the preferred minimum electric power in kW that the co-
Minimum generator is to generate.
Power (kW)
Heat Rated Specify the heating capacity of the co-generator in kW. It is the
Power (kW maximum heat supply that the co-generator can generate.
Heat Specify the preferred minimum heat supply in kW that the co-
Minimum generator is to generate.
Power (kW)
Electric Specify the efficiency of the co-generator at maximum generator
Efficiency load, in kWh/kg of consumed natural gas. If the co-generator
Maximum efficiency at maximum power is available in terms of percent, this
(kWh/kg) setting can simply be determined by multiplying the percent value
with the higher heating value or energy content of the input fuel in
terms of kWh/kg. Higher heating values for different fuel sources can
be found in the related handbooks or the Internet.
Electric Specify the efficiency of the co-generator at minimum generator load,
Efficiency in kWh/kg of consumed natural gas. If the co-generator efficiency at
Min (kWh/kg) minimum power is available in terms of percent, this setting can
simply be determined by multiplying the percent value with the higher
heating value or energy content of the input fuel in terms of kWh/kg.
Higher heating values for different fuel sources can be found in the
related handbooks or the Internet.
Gas-to- Specify the gas-to-electricity conversion ratio of the co-generator. For
Electric Ratio example, a ratio of 0.35 means that 35% of the energy content of
natural gas is converted to electricity and the remainder is in the form
of heat that cannot be recovered completely.
For example, if there are100 units natural gas (input), we get 35 units
as electricity. The remaining part (that is, 65 units) is heat but all of
that cannot be recovered. We can recover about 45 units. Therefore,
there are 20 units of parasitic loss (not recoverable)
A typical value for this setting is 0.35.
Gas-to-Heat Specify the gas-to-heat conversion ratio of the co-generator. For
Ratio example, a ratio of 0.45 means that 45% of the energy content of
natural gas is converted to recoverable heat. It is the head that can
cover all or part of the heat-demand requirements of the microgrid.
A typical value for this setting is 0.45.
Fuel Density Specify the density of the fuel of the co-generator in terms of kg per
(kg/Nm3) normal cubic meter (Nm3), which is a typical unit for gaseous fuels
such as natural gas. Any fuel source has its own density; search the
related handbooks or the Internet for the appropriate value.
Fuel Cost Specify the cost of fuel that operates the co-generator, in dollars per
($/Nm3) normal cubic meter (Nm3).
For example, enter the price of the natural gas. The default value of
$0.35 per Nm3 is almost equal to $1 per Therm or $10 per thousand
cubic feet of natural gas. The cost is in dollars; for other currencies
simply enter that value and be consistent in all fields involving the
currency.
DMC490 Configuration
0 to 350
1,000,000
0 to
50
1,000,000
0 to 250
1,000,000
0 to
50
1,000,000
0 to 1000 5.25
kWh/kg kWh/kg
0 to 1,000 4.2
kWh/kg kWh/kg
0 to 1 0.35
0 to 1 0.35
0 to 5 0.8
kg/Nm3 kg/Nm3
0 to 100 0.35
Nm3
Nm3
35