University Exhaust Heat Recovery Case Study
California State University
Long Beach, CAUSA Heat Exchange Focus:
EM - Energy Manager Series (10 units)
Installation consists of ten Cain EM-28 heat transfer models. Each unit is recovering 400,000 BTUs per hour from its paired 6,300,000 BTU hot water boiler. The heat sink temperature of the hot water return loop (30 GPM) is being raised from 160°F to 186°F by reducing the boiler exhaust gas temperature from 490°F to 300°F (1,750 SCFM).
Payback vs. Fuel Savings (per unit)
Unit Cost: $9,962
Payback: 8.6 Months
Annual ROI: 140%
Annual Fuel Savings: $13,924
Life Expectancy Fuel Savings: $278,480 (20 years)
Summary:
The California State University, Long Beach campus encompasses a total of 323 acres with 84 permanent buildings. 1,962 students live on campus in 18 residence halls. The ten Cain EM Series heat recovery units are used to recover exhaust waste heat from hot water boilers and preheat the hot water return loop. This results in reduced fuel costs for the university.
