Low Temperature Space Heating Systems

Dr. Evgueniy Entchev

CMX 2012 Learning Forum March 22, 2012

Drake Landing Solar Community

Largest Solar Community project in North America

Location Okotoks, Alberta - 20 km south of Calgary

Subdivision of 52 homes space and water heated by solar

End-user space heating utilization systemThe designed system must beable to :

Provide comfort while utilizing renewable source

Work with fluid incoming temperature from 65oC – 35oC

Provide heat recovery from the exhaust house air

Return Plenum

Supply Plenum

Heating Coil

HRV

Blower

HW outTw1 Tw2

Ta1

Ta2

HW in

Ta6

Ta7

Ta3

Ta4

Ta5

Fresh air To outside

House exhaust air

Preheated air temperature

Air HandlerTo achieve the required

versatility - vary 3 parameters

Air flow

Water Flow

Water Temperature

Design of low temperature AH

Ability to vary the air flow as a function of the incoming fluid temperature

Use baffles to provide an ~ even air distribution over the coil

Use high efficient blower motors - ECM to save energy

Re- design the heating coil to get as max heat as possible at given air flow velocity

Design of low temperature AH Use highly insulated

stratified tank

Use high efficient DC water pumps

Vary the water flow as a function of the outdoor temperature to preserve the stratification in the tank

Design of low temperature AH

Use at least 3 control set points 35oC, 50oC, 65oC

Use AI learning algorithms to optimize the system operation and comfort delivery

Utilize as many modulating devices

Input Layer(8 inputs)

1

2

3

4

5

6

7

8

Stack Current

Stack Voltage

1 Hidden Layer

(10 neurons)

1

2

Output Layer(2 outputs)

Stack Fuel Flow

Stack Temp.

Stack Air Flow

Stack Air Inlet Temp.Burner Fuel FlowBurner Combustion Temp.Burner Air Inlet Temp.

Burner Air Flow

Thank You!