Page 1

WASTE HEAT TO POWER Low temperature Organic Rankine Cycle technology converts waste heat to fuel-free, emission-free power


The Green Machine

Twin Screw Expander

ElectraTherm’s award-winning Green Machine utilizes low grade heat sources to make electricity with: • No fuel requirement • 20-year design life • Minimal footprint • Low maintenance • Zero emissions • Attractive payback

ElectraTherm’s twin screw expander is more cost effective, robust and has lower maintenance requirements than radial or axial turbines.

Standard Features and Specifications • Fully automated controls with remote monitoring and operating capabilities • Induction generator with power factor correction for easy grid connection • Simple maintenance, with no gearbox or oil changes • Closed loop air cooled condensing option results in zero water consumption • NEMA 3R / IP 54 compliant enclosure for outdoor use • CE certified • Braised plate heat exchangers • Robust, Twin Screw Expander power block • Patented in-process lubrication

Applications ElectraTherm’s Green Machine makes electrical power from various heat sources, including: • Stationary Internal Combustion Engines • Biomass Boilers • Co-Produced Fluids from Oil & Gas, Geothermal • Industrial Boilers & Process Heat • Concentrated Solar Thermal

How It Works

THIS IS SMART POWER™

2

Evaporator

ORC

working fluid

LOOP

1 Pump



Steps in the Process 1) Working fluid is pumped to higher pressure and transferred to the evaporator. 2) Heat captured by the evaporator boils the working fluid into pressurized vapor. 3) The vapor flows through the twin screw expander, spinning an electric generator to produce power. 4) The vapor is cooled and condensed back into a liquid in the condenser to repeat the cycle.

3 Twin Screw Expander

=

ElectraTherm’s waste heat-to-power system uses a closed loop Organic Rankine Cycle (ORC).

Generator Condenser 4


WASTE HEAT TO POWER at

BIOGAS PLANTS ORC & Biogas Plant = BIOGAS+ A biogas plant that uses the Green Machine converts excess engine heat into valuable electricity and reduces existing on-site electrical cooling loads for the engine. The Green Machine increases biogas plant efficiency and lowers fuel requirements for the biogas engine. This means increased revenue for the biogas plant. All of this is done with zero emissions.

Anaerobic Digester Balance of Plant

Adding a Green Machine to a biogas engine creates a significant value and helps meet thermal requirements for various incentives.

A small amount of the heat produced by the engine at a biogas plant is used to keep the anaerobic digester warm, and is sometimes used for district heating. The remaining, excess heat requires electricity to cool. The Green Machine can transform this heat into additional electricity, increasing plant efficiency, and reducing on-site electrical cooling loads.

Green Machine condensing

power

storage tanks

farm

heat CHP units biogas

digester manure/maize/organic waste

monitoring & controlling

solids & liquids

bedding

power

compost de-watering

fertilizer

Green Machine in the field; Trechwitz, Germany


WASTE HEAT TO POWER FROM

GEOTHERMAL

& CO-PRODUCED FLUIDS

Geothermal Balance of Plant At a geothermal site, the Green Machine 4100C captures geothermal heat to generate power at temperatures and flows well below most ORC technologies. The robustness of the machine and the ease of installation make the Green Machine applicable and economical to the vast low-temperature geothermal resources available around the world.

4100C with Air Cooled Condenser

Geothermal heat available for other uses

Production well Re-injection with pump well

Additional Downstream Heat Uses: • Building ventilation systems • Radiant floor heating • Swimming pools • Drying Processes

Introducing The Green Machine 4100C The containerized Green Machine provides added value with turnkey installation and operating features. The air cooled condenser is included and controlled by the Green Machine. There is a small footprint due to the condenser being mounted on the container. The container is easy to install and balance of plant requirements are greatly reduced. Additional Benefits Include: • 20-foot container can be placed directly on level, compacted gravel; No concrete pad is required • Air cooled condenser plumbing is included with equipment • Simple electrical connections • In-out flanged connections provided at end of container for plumbing connections

• Enhanced serviceability • Easy access to all components and control panels • Lower installation material and labor costs • Available in water cooled and air cooled condensing versions • Geothermal specific models also available

• Domestic hot water • Driveway ice melting • Cattle trough warming • Aquaculture


Performance Electrical Output

Gross Electrical Output

Parameters

Hot water input temp range Hot Water Input Parameters

Thermal input range

1.37-2.94 [ 400-860 ] 50-200 [ 3.2-12.6 ]

˚F

40-110

[ ˚C ]

[ 4-43 ] 1.30-2.72

[ kWth ]

[ 380-795 ]

Ambient air temp Heat rejected to condenser

gpm [ l/s ]

MMTBU/hr

Cooling water flow rate

Direct Air Condensing Conditions

170-240 [ 77-116 ]

[ kWth ]

Cooling water input temp range Heat rejected to cooling water range

˚F [ ˚C ] MMTBU/hr

Flow rate range

Water Cooled Condensing Parameters

Up to 65 kWe

gpm

220

[ l/s ]

[ 13.9 ]

˚F

<100

[ ˚C ]

[ <38 ]

MMTBU/hr

1.30-2.72

[ kWth ]

[ 380-795 ]

ElectraTherm Water Cooled Condensing System Performance GREEN MACHINE GROSS POWER OUTPUT (Cooling Water Conditions of 70˚F [21˚C] / 220gpm [13.9 l/s])

70

POWER OUTPUT (kW)

60 50

Hot Water Source Temp

40

240˚F [116˚C] 230˚F [110˚C] 220˚F [104˚C] 210˚F [99˚C] 200˚F [93˚C] 190˚F [88˚C] 180˚F [82˚C] 170˚F [77˚C]

30 20 10

20

[1.3]

40

[2.5]

60

[3.8]

80

[5.0]

100

[6.3]

120 [7.6]

140

[8.8]

160

[10.1]

180

[11.4]

200

[12.6]

HOT WATER SUPPLY FLOW RATE (gpm [ l/s]) This graph displays Green Machine gross power output over different hot water temperatures and flow rates, for a given water condensing point.

ElectraTherm, Inc. is a clean energy company headquartered in Reno, Nevada. ElectraTherm’s product, the Green Machine, generates fuel-free, emission-free power from low temperature waste heat using the Organic Rankine Cycle (ORC) and patented technology. Our machines are modular, robust, low maintenance power generators. © 2013 ElectraTherm | 4750 Turbo Circle, Reno, Nevada 89502 | www.electratherm.com

ElectraTherm's Master Brochure