Electrical Connections

Buss duct is used for all gas generator output power connections to the main switch, cable tray for all connecting control wiring.  The diesel generator is connected via conventional wire and wireway.

Jacket Water and Auxiliary (Oil and Turbocharger Intercooler) Cooling

Jacket water and auxiliary radiators are roof mounted (horizontally) above an air plenum room below, which is pressurized by four 5 HP electric motor-driven cast propeller fan assemblies.  The fans for each module are individually controlled based on return jacket water temperature by the house controller, to minimize parasitic fan energy losses.  The auxiliary radiator and jacket water are in series in the airflow, with air passing from the plenum room through the auxiliary radiator first, then through the jacket water radiator above.

Block Heating

Each group of three gas engines is thermally coupled by a three pass welded plate heat exchanger that allows a single running engine to maintain 160 degF jacket water temperatures in its two companion gensets.  The three engines’ jacket water systems are completed isolated from one another by the plate heat exchanger.

The diesel engine has a conventional thermostatically controlled electric block heater.

Utilities

Makeup oil is supplied from a central location via hard piping and permanent pump to each engine’s makeup oil tank and also directly to the oil sump fill point, ahead of the oil level regulator.  Spent oil from each engines’ sump and oil cooler is evacuated via permanent pump and hard piping to an outdoor waste oil tank capable of storing one complete set of oil changes for all six gas engines.  Using this system, oil replenishment and changes can be accomplished quickly and without risk of spill or wasted oil.

Compressed air is supplied via a 10 HP Ingersoll Rand industrial air compressor with a vertical tank.  Compressed air is available for operating pneumatic engine controls and pneumatic service tools.  Engine pneumatics can also be operated using the high pressure natural gas fuel supply, although this mode of operation requires that fuel gas supply pressures be maintained above 50 psig in order to achieve full generating system output.

Sound Attenuation

The generation modules are fully noise attenuated with engineered acoustical materials.  Exhaust noise is muffled with critical grade silencers. The system currently emits sound resulting in noise levels below 65 dBA at the property line approximately 100 ‘ away.  This noise drops to almost 55 dBA when the radiator fans are not operating.  Use of a variable speed drive to slow the fans rotational speed could be expected to lower overall sound levels to below 58 dBA at all times, under all load conditions.

Cogeneration Equipment

Each gas generator is equipped with a welded plate jacket water heat exchanger sized for complete recovery of jacket water heat.  The secondary side of these heat exchangers is not currently connected to any of the plant thermal load.

Equipment Item

Manufacturer

Model

#

Notes

Engines

Cooper Superior

2406G

6

5 new, 1 used (7000 hrs)

Alternators

Newage Stamford

HC736F

6

97% efficiency @ 1.0 PF

Prime Power Genset Assemblies

Simpower

SP0900N3Q:2406G

6

925 kW @.80 PF, 935 kW @1.00 PF

Backup Diesel Genset Assembly

Mitsubishi

1000 kW

Genset Enclosures

PCX

NA

6

Noise attenuated to 65 dBA @ 50’

Jacket Water HeatX

WTT

3

System Switchgear

IPS Assembler

Siemens Gear

NA

1

Installed in Base Module

System Controls

Micropro

Micropro

6

Installed in Base Module, master/ slave, all slaves available as masters

Distribution Transformers

Cooper & Sunbelt

3500 and 3750 kVA

4

Use two existing for step down, one existing and one new for step up