Heat Recovery

Heat recovery is utilization of "waste” energy streams. Sources for heat recovery’ are:

• Relief / exhaust air

• Combustion gases

• Coolant stream

The recovered heat is used to:

O

Air-to-Air Heat Recovery System

• Air-to-air HX (heat exchanger)

• Heat wheel

• Heat pipe

• Heat pump

_J

5

OUTSIDE

AIR

EXHAUST

AIR

SUPPLY

AIR

RETURN

AIR

■c

R

I

(B) COUNTERFLOW HEAT EXCHANGE

_T

SUPPLY

AIR

EXHAUST

AIR

OUTSIDE

AIR

RETURN

AIR

Ђ

R

~L

(A) PARALLEL HEAT EXCHANGE

Heat Recovery Heat Recovery

OUTSIDE AIR

 

SUPPLY

AIR

 

OUTSIDE AIR

 

RETURN

AIR

 

RETURN

AIR

 

EXHAUST

AIR

 

EXHAUST

AIR

 

SUPPLY

AIR

 

(D) MULTIPLE—PASS HEAT EXCHANGE

 

(C) CROSSFLOW HEAT EXCHANGE

 

Heat Recovery Heat Recovery

Air-to-air type of heat recovery system

Heat Recovery

Warm Exhaust ai

подпись: warm exhaust ai Heat Recovery

Heat Recovery

Heat Pipe

Warmed outdoor air

Cooled exhaust air — A

Cool Outdoor air

2-14

подпись: 2-14Potential obstacles for heat recovery:

• Small AT => large heat exchanger (very expensive)

• Separation of source and end use

• Non-coincident loads

• “Parasitic” energy

Posted in Fundamentals of Heating. Ventilating, and Air-Conditioning


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