Agriculture Exhaust Heat Recovery Case Study
Diavik Diamond MineYellowknife, Northwest Territories
Canada Heat Exchange Focus:
HRSR - Heat Recovery Silencer Radial Series (11 units)
Installation consists of eleven HRSR-472D24.7SSP heat transfer models. Each unit is recovering 6,799,000 BTUs per hour from its paired Caterpillar 3612 engine. The heat sink temperature of 60% ethylene glycol mixture (695 GPM) is being raised from 202°F to 221°F by reducing the engine exhaust gas temperature from 811°F to 400°F (10,742 SCFM).
Payback vs. Fuel Savings (per unit)
Unit Cost: $163,150
Payback: 2.1 Months
Annual ROI: 563%
Annual Fuel Savings: $917,860
Life Expectancy Fuel Savings: $18,357,200 (20 years)
What began as a method of utilizing expendable landfill gas to produce energy has evolved into full-circle energy recycling for Innovative Energy Systems. The company generates and sells enough electricity to light a small city, and uses the heat captured by seven Cain heat recovery units to heat their 12.5 acre greenhouse, producing 5.5 million pounds of hot house tomatoes annually.