Compact cogeneration unit with synchronous alternator to generate three-phase current 400 V, 50 Hz, heating water at temperature level 90/70 °C and low-temperature heat 40/44.9 °C (LT-heat). Operation with natural gas, oxidation catalytic converter for low-emission regulated lean operation, emission values according to BImSchG § 22. The performance data is valid for an altitude of up to 100 m above SL and an air temperature of up to 25 °C with an LT-return temperature of up to 40 °C.
| Operating Mode |
Electric Power (gross) |
Internal Consumption * |
Electric Power (net) |
Minimum Electric Power (partial load) |
Heating Power (tolerance 8 %) |
Gas Input (tolerance 5 %) |
| Mains Parallel Mode |
532 kW |
11 kW |
521 kW |
266 kW |
652 kW |
1310 kW |
| Standby Power System |
604 kVA |
|
|
|
593 kW |
1191 kW |
*) without external consumers, preliminary fuse in separate feed (if required): 63 A
Design and Scope of Supply
Engine with Accessories
- Engine Type: MAN E3262 LE202
- Combustion Method: Gas Engine
- Cycle: 4-stroke
- Number/Design of Cylinders: 12 / V-assembly
- Bore/Lift: 132/157 mm
- Displacement: 25.78 dm³
- Rotation Speed: 1500 rpm
- Average Piston Speed: 7.85 m/s
- Average Effective Pressure: 17.07 bar
- Compression Ratio: 12:1
- ISO Standard Rating per DIN ISO 3046-1: 550 kW
- Specific Full Load Consumption: 2.38 kWh/kWhmech.
- Full Load Consumption at Hi (Net Calorific) = 10 kWh/Nm³: 131.0 Nm³/h
- Average Consumption of Synthetic Oil (estimated): 150 g/h
Engine Description:
- Crankcase: with cylinder block made of one piece of cast iron, closed from below by oil tray, closed to the rear by flywheel timing case, exchangeable, wet cylinder liners, sealed twice.
- Single Cylinder Head: with integrated cooling water and oil ducts, cast-in spin suction ducts and shrunk valve seat rings and replaceable valve guides.
- Valves: arranged hanging, two valves one for outlet, valve stems made from carbide metal, camshafts with 7 bearings.
- Light Metal Pistons: cooled by pressurized oil stream via oil nozzles.
- Cracked Connecting Rods: crankshaft with 7 bearings and screw-on counterweights, bearing boxes with steel backside, leaded bronze liner, and ternary bearing surface.
- Double Flow Mixture Suction Pipe: one insulated exhaust fume collector and pressure oil lubricated exhaust turbocharger per cylinder bench, casing, and bearing bracket water-cooled.
- Water Cooled, Double-Stage Mixture Cooler.
- Gear Pump: for pressure lubrication, tandem lube oil filter in the main flow, cooling by oil cooler, automatic oil refill unit, and oil storage tank.
- Air Intake: via dry filter from the engine room.
- Crankcase Breather: with oil separator valve and connection to the air intake.
- Closed Cooling Water Circuit: with electrical three-phase circulating pump 400 V, safety valve, and expansion tank with pressure gauge for engine cooling.
- Electrical Starter: 24 V, 7 kW.
- Microprocessor-Controlled Ignition System: with one ignition coil per cylinder.
Gas Supply
Safety gas line in accordance with DVGW-VP 109, customer assembly above the unit, consisting of a bulk delivered ball-valve with thermal shutoff, filter, pressure gauge with push-button valve, two solenoid valves, pressure control valve, and flexible connecting tube, DVGW certified. Variable, step-motor-controlled gas/air mixer, electronic speed governor.
Gas Supply and Catalyst
Automatic regulation of the air/fuel ratio corresponding to the load pressure and the mixture temperature, catalyst for emission reduction according to the standards of German BImSchG, built as an oxidation catalyst for regulated lean operation with natural gas in combination with low-ash and low-alloy gas-engine oils. Casing made of special metal coated metal. Emission values after catalyst in steady state operation related to 5 % oxygen in exhaust gas at rated power (as-new condition):
- NOx / CO: < 500 / 300 mg/Nm³
- HC total / HCHO: < 1.3 g/Nm³ / 20 mg/Nm³
Exhaust Silencer
Primary and secondary exhaust silencer made of stainless steel to reduce the exhaust noise level as recommended accessories for on-site installation in the exhaust pipe.
Alternator
Inner-pole alternator, air-cooled, protection class IP 23, build design B3/B14, according to VDE 0530, radio suppression grade N. Synchronous alternator with integrated field coil, absorber cage, and compound, brushless, two-layer winding, low harmonic content design, insulation class H.
- Rated Output: 760 kVA
- Rated Current (nom. power, cos φ 0.8): 960 A
- Efficiency Rate (nom. power): 96.7 %
- Cos φ: 1.0
- Operating Mode: Star
- Ambient Temperature, Max.: 40 °C
- Voltage: 400/231 V
- Frequency / Rotation Speed: 50 Hz / 1500 rpm
Coupling
Engine and alternator connected rigidly by SAE housing and interconnecting flange. Flexible coupling between engine flywheel and alternator shaft. Replacing the flexible intermediate ring is possible without disassembling both engine and alternator.
Base Frame and Pipework
Base frame as torsion-resistant, versatile profile steel construction used to carry engine/alternator as well as the following components of the CHP unit:
- pump for engine cooling circuit,
- heat exchangers for engine cooling circuit and exhaust,
mounted ready for operation in the base frame, with complete pipework and insulated as far as required. All condensate lines are combined into one common outlet. If required for mounting in the heating water return: heating water circulating pump and 3-way valve for return temperature lifting, designed for operating data according to para. 3.5.
Sound Absorbing Case
Powder-coated steel plate casing with highly effective sound-absorbing lining with elastic supporting and a controlled fan for ventilation of the canopy. Easily accessible due to removable cowls on all sides with quick-lock mechanisms. Base frame decoupled with Sylomer strips from the canopy.
Switch Cabinet, Integrated Compactly Within the Sound Absorbing Case
Power section according to VDE AR-N 4110:2018, on request VDE AR-N 4105:2018 (grid monitoring, synchronization, alternator contactor, and power switch protected with add. shunt release, wear-free mains starter), iPC for unit control and monitoring (with 10.1'' color TFT touchscreen display (opt. 15.6'') incl. control ''MiniManager'', opt. remote monitoring system ''RemoteManager''), ready to use and wired. For details please view separate technical descriptions.
Cooling Water Heat Exchanger Incl. First Stage of Mixture Intercooler (HT-heat)
The engine cooling water heat is transferred to the heating water via a plate heat exchanger.
- Material: 1.4401
- Thermal Output from Engine Cooling (8 % tolerance): 356 kW
- Heating Water Temperature Inlet/Outlet: 70/82 °C
- Pressure Drop (Heating Circuit): 370 mbar
- Cooling Water Temperature Inlet/Outlet (in as new condition): 80/86 °C
- Flow Rate (Engine Cooling Circuit): 44.3 m³/h
- Cooling Water Pump Load (highly efficient according to ErP2015): 3.8 kW
Exhaust Heat Exchanger
The exhaust heat of the engine is transmitted by a tube-type exhaust heat exchanger to the heating water.
- Material: 1.4571 / P235
- Thermal Output (8 % tolerance): 254 kW
- Exhaust Gas Temperature Inlet/Outlet (as new condition): 405/120 °C
- Heating Water Temperature Inlet/Outlet: 82/90 °C
- Pressure Drop (Exhaust Side): 15 mbar
- Pressure Drop (Heating Circuit): 230 mbar
If required, an additional exhaust gas heat exchanger is available for use of condensation heat, mounting on the side of the customer. The additional heat output of this heat exchanger (components touching the exhaust gas made of stainless steel 1.4571) is up to 115 kW.
Second Stage of Mixture Intercooler (LT-heat)
The LT mixture cooler heat must be integrated into a low-temperature heating circuit by the customer or eliminated via a separate cooler. In this case, the inlet temperature must be controlled constantly and the minimum volume flow must be ensured. Tube assembly heat exchanger, material Cu
- Thermal Output (8 % tolerance): 42 kW
- Cooling Water Temperature Inlet/Outlet: 40/44.9 °C
- Pressure Drop Cooling Water: 450 mbar
Optional: connection set consisting of a circulation pump, 3-way valve with control, and blast cooler for mixture cooling.
Technical Data and Elucidations for Planning and Operation
Fuel
Natural gas of normal composition, free of phosphorus, sulfur, halogens, arsenic and heavy metals as well as solids and liquids, with constant fuel value and pressure and according to the rules of the DVGW sheet G260.
- Lower Limit for Lower Calorific Value (Hi): 10 kWh/Nm³
- Methane Number: > 80
- Permissible Hydrogen Content in Natural Gas (mixture): max. 20 Vol.%
- Gas Flow Pressure Range (overpressure, constantly): 20 - 100 mbar
- Gas Temperature: 10 - 30 °C
Operating values for other fuel compositions and conditions on request. We recommend using a gas warning system in the operating room (on side of the customer).
Combustion Air and Ventilation
- Combustion Air Requirement: 2048 Nm³/h
- Air Supply, in Total: approx. 9450 m³/h
- Inlet Air Temperature Min./Max.: 10/30 °C
- Heat Radiation from Casing Surface: approx. 7 kW
- Heat Ventilation from Within Casing: approx. 41 kW
- Exhaust Air: approx. 7400 m³/h
- Exhaust Air Temperature: 50 °C
- Free Pressing of Exhaust Air Fan at Operating Point (max.): 250 (1110) Pa
- Electric Load of Fan at Operating Point (max.): 2710 (4700) W
Highly efficient radial fan (according to ErP2015) with EC-motor and temperature-controlled regulation, if required with connection box. Operating ventilation system above standard conditions not possible and leads to increased power consumption, sound level and operating temperature.
Exhaust Gas
- Exhaust Gas Flow Rate at 120 °C: 3140 m³/h
- Permitted Back Pressure after Unit: 20 mbar
A continuous condensate drain must be installed in the connected exhaust gas system. For multi-unit systems, each unit has to be equipped with a separate exhaust gas system.
Sound Levels
- Sound Level of Engine (with/without sound-absorbing case): 74/89 dB(A)
- Exhaust Sound Level after Optional Exhaust Gas Silencer: 78 dB(A)
- Exhaust Sound Level after Optional Secondary Exhaust Silencer: 60 dB(A)
- Ventilation Air Sound Level after Fan (Operating Point): 90 dB(A)
Free-field sound pressure values in 1 m distance. The triple shock absorption of the CHP unit reduces the impact sound transmission to a minimum. A foundation for installing the CHP is not necessary if the engine room floor is able to carry the load of the CHP unit and the unit is set on the foundation plate of the building.
Heat Production
The HT-heat (motor cooling, exhaust, and mixture cooling) as well as the LT-heat both have to be utilized on part of the customer at all operating points. Layout data:
- LT Heating
- Return Temperature to Unit (Min./Max.): 40 °C 60/70 °C
- LT: min. / heating: standard flow rate: 7.4 m³/h 26.3 m³/h
- LT: max. / heating: max./standard temperature increase: 4.9 K 30/20 K
- Pressure Drop: 0.45 bar 0.60 bar
- Operating Pressure (Min./Max.): 1.5/6 bar 1.5/6 (optional 10) bar
The return connections have to be equipped with a strainer with a mesh size of 0.25 mm.
Filling Quantities and Quality Demands
- Oil Tray: 90 liters
- Oil Storage Tank: 105 liters
- Engine and Heat Exchanger Coolant: 105 liters
(Lubricating oil and coolant have to fit separate release lists.)
- Heating Water: 170 liters
Treatment of the contents, additional, and rotating heating water according to VDI guideline 2035 (group 4) with the following limits:
- Total Earth-Alkaline /Total Hardness: < 0.02 mol/m³ / < 0.1 °dH
- pH-Value: 9 - 10.5
- Molecular Conductance (at 25 °C): < 250 μS/cm
- Oxygen Content: < 0.02 mg/l
- Chloride Content: < 20 mg/l
- Filterable Substances: < 2 mg/l
Appearance: colorless, clear, and free of mechanical impurities. Use of oxygen binders should be avoided if possible.
Dimensions, Connections and Weight
- Length (Basic Measurements): 4000 mm
- Width: 1500 mm
- Height: 2600 mm
- Operating Weight: 8120 kg
- Dry Weight: 7670 kg
- Heating Water Inlet/Outlet: DN 80 (PN 10)
- Mixture Cooler Flow/Return: R 2" (i)
- Gas Regulation Unit (flange): DN 65 (PN 16)
- Condensate: R ½" (a)
- Exhaust (flange): DN 250 (PN 10)
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