Agriculture Exhaust Heat Recovery Case Study

Customer:

Diavik Diamond Mine

Yellowknife, 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)

Summary:
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.

Agriculture Exhaust Heat Recovery Case Study