High Efficiency Heating

Mike Pace – Senior Engineer

National Grid C&I Efficiency Programs

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Prescriptive Controls• Energy Star Programmable Thermostats

• A thermostat that is able to be programmed to set back temperature to a low setting during times of low use.

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Prescriptive Controls• Boiler reset controls

• A reset control is a device that automatically controls the boiler water temperature based on the outdoor air temperature. Boiler water can run a little cooler the warmer it is outside - saving cost to heat the boiler water, energy savings can be in the 5 % range

• 1 stage

• multi-stage

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Heating Equipment• Boilers

• Steam boilers produce steam for heat or process.

• 82%-85% AFUE is considered high Efficiency for a steam boiler

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Heating Equipment• Hydronic boilers are hot water boilers – most typical

boiler type

• 85% AFUE/Thermal efficiency is considered a high efficient boiler

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Heating Equipment

• Condensing Boilers

• How does a condensing boiler work ?

• Very similar to a hydronic boiler except it is designed

capture even more heat from the flue gases. The flue gases

give up their latent heat, forming condensate.

• Flue Gas temperature of Condensing boiler is 120-140

degrees

• Flue Gas temperature of standard hydronic boiler is 250 to

400 degrees

• High efficiency condensing boilers are 90 % or higher

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Condensing boiler efficiency

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Heating Equipment

• Condensing Boilers

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Efficiency Improvement for large boilers

Fire Tube & Water Tube

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Efficiency Improvements for large boilers

Fire Tube Boiler with linkage controls

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Efficiency Improvements for large boilers

Fire Tube boiler with linkage less controls

2-5% Fuel Savings !!!

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Efficiency Improvements for large boilers

Other Measures to think aboutStandard & Condensing Economizers

Blow Down Heat Recovery

Blow Down Controls

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Heating Equipment

• Condensing Unit heaters • Unit heaters are probably the most common piece of

heating equipment in any warehouse type work space

• Condensing Unit heaters work on same principal as

Condensing boilers

• 90 % efficiency is considered high efficiency

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Heating Equipment

• Infared Heaters – 2 types• Low intensity tubular heaters generate radiant heat like the

sun and is absorbed by objects, such as floors and

equipment, this heat then is re-radiated back out to the

surrounding area

• Efficiencies to 90%

• Extremely comfortable heat for warehouses, manufacturing

space, garages etc

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Heating Equipment

• Infared Heaters – 2 typesHigh Intensity Infared Heaters

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Heating Equipment • Direct fired heaters

• Most frequently associated with make up air units.

• Make air units heat air that is brought into buildings to replace air

that that is loss though air changes, this is especially important in

buildings that purposely exhaust air such as manufacturing

facilities, kitchens, laboratories

• Direct fired heaters are 100% efficient

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Heating Equipment • Furnace

• Instead of heating water like a boiler a furnace heats air which is

then moved by a fan through ductwork

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Domestic Hot Water • Hot water heaters

• Indirect • The source of energy for indirect fired hot water is the boiler,

boiler system water is circulated through a heat exchange

within a well insulated hot water tank

• Very efficient because it eliminates flue gas losses ( no flue)

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Domestic Hot Water

• Hot water heaters• On Demand Tankless Water heater

• as the name suggest, there is no tank and hot water is

produced instantaneously

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Kitchen Equipment• Cooking Equipment

• Commercial Steamer steam cookers

• Commercial Fryer

• This equipment can significantly reduce annual energy

costs compared to standard efficiency units.

• Energy efficient cookers and fryers offer shorter cook

times, higher production rate

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SolarSolar Thermal Hot Water

• Use Solar as the energy to power a indirect hot water

tank

• Usually used in conjunction with a gas boiler

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Incentives for high efficiency equipment

Furnaces, up to $500

Condensing unit heaters, up to $500

Infrared heaters, up to $500

Steam boilers, up to $700

Direct fired heaters, up to $2,000

Hydronic boilers, up to $5,000

Condensing boilers, up to $15,000

Visit www.thinksmartthinkgreen.com for more detail