TEAM UP! FOR Waste-Heat AND Recovery SAVINGS

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TEAM UP!FOR Waste-Heat AND Recovery SAVINGS

• It can be as easy as re-using hot exhaust air.

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Why should we care?

• For the environment
• For the bottom line

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Why should we care?

• For the environment
• Re-using hot exhaust air uncovers energy
  savings.

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Why should we care?

• For the bottom line
• Re-using hot exhaust air saves money.

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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

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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

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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?
• Whats 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?

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What can we do?

1. Housekeeping
2. Low-cost opportunities
3. Retrofits

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What can we do?

• 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.

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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.

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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.

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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.

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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.

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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 exchanger
• with other processes.

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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.

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How can we do it?

• We have the people.
• We have the tools.
• oee.nrcan.gc.ca/industrial

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Thank you

• Together we can make it happen.
• Its good for the environment.
• Its good for the bottom line.