TEAM UP!FOR Waste-Heat AND

Recovery SAVINGS

It can be as easy as re-using hot exhaust

air.

Why should we care?

For the environment

For the bottom line

Why should we care?

For the environment

Re-using hot exhaust air uncovers energy savings.

Why should we care?

For the bottom line

Re-using hot exhaust air saves money.

What are the sources?

Usable energy may be available from

Hot flue gases Hot or cold water

drained to a sewer Exhaust air Hot or cold product or

waste product

What are the sources?

Usable energy may be available from (cont.)

Cooling water or hydraulic oil Ground-source thermal energy Heat collected from solar panels Superheat and condenser heat

rejected from refrigeration equipment

What factors should be considered?

How does the supply compare with demand? How easily can the waste-heat source be

accessed? How far is the source from the demand? What’s the quality of the waste heat? Are there any implications for product quality? How much upgrading is required? Are there any regulatory limits? What will the payback period be?

What can we do?

1. Housekeeping2. Low-cost

opportunities3. Retrofits

What can we do?

1. Housekeeping Inspect and maintain equipment to

minimize the production of waste heat.

Identify sources of waste heat. Eliminate as many sources of waste

heat as possible.

Reduce the temperature of the remaining waste heat.

What can we do?

2. Low-cost opportunities Capture waste heat from a clean waste

stream that normally goes into the atmosphere or down the drain, and then pipe the waste stream to where it can be used.

Re-use hot exhaust air for drying.

What can we do?

2. Low-cost opportunities (cont.)

Use waste-process water as a heat source for a heat pump.

Use the heat of the plant effluent being treated in a wastewater treatment facility as a heat source for a heat pump.

What can we do?2. Low-cost opportunities (cont.) Install improved automatic

controls. Re-use heat from cooling hydraulic

oil (e.g. within moulding machine and the injection moulds themselves). This reduces the electrical load on the production process as well.

What can we do?3. Retrofits Install waste-heat reclamation

equipment (e.g. replace a cooling tower circulation loop with a shell-and-tube heat exchanger).

Upgrade or replace outdated waste-heat reclamation equipment.

What can we do?3. Retrofits (cont.)

Recover flue gas heat and use it as a heat source for a heat pump.

Use an absorption heat transformer, which reclaims waste heat using a solution of lithium bromide.

Integrate a compact heat exchangerwith other processes.

What can we do?3. Retrofits (cont.) In a large computer centre, capture

generated heat by using thermal storage. Recover heat generated through

refrigeration and upgrade it using a heat pump.

Convert high-temperature flue gas heat (e.g. from metallurgical furnaces) into superheated steam for electric power generation.

How can we do it?

We have the people.We have the tools.

oee.nrcan.gc.ca/industrial

Thank you

Together we can make it happen.

It’s good for the environment.

It’s good for the bottom line.