Daikin VRV III Manual page 44

ED34-862
Installation Examples
Direct duct connection system
6.8.7.2 Mechanism of Energy Saving
By heat recovery operation
Approx. 20% reduction
of heating / cooling load
By setting to automatic
ventilation mode
Approx. 6% reduction
of heating / cooling load
Total
26% reduction
of heating / cooling
load
Note :
The total heating / cooling load may vary depending on the climate or the other environmental conditions.
General Information
Independent duct system
(HC0007)
HRV unit recovers the thermal energy during cooling / heating operation of air
conditioner. HRV reduces the cooling / heating load drastically and enhances the
heating / cooling efficiency.
Exhaust Exhaust
Air Air
Outdoor
Air
Proper use of Heat recovery ventilation and normal ventilation saves energy.
When the cooling operation is required in winter, use of heat recovery ventilation is not
efficient because the outdoor air temperature is normally lower than that of the indoor.
Thus, the proper use of ventilation mode enhances the heating / cooling efficiency.
Automatic Ventilation mode changeover
Operation Sensor of ventilation
Difference between
indoor / outdoor temp.
Indoor temp. > Outdoor temp.
Cooling
Indoor temp. < Outdoor temp.
Indoor temp. > Outdoor temp.
Heating
Indoor temp. < Outdoor temp.
Refer to the CONTROL for the mode changeover.
Heat Recovery mode
Exhaust
Air
Outdoor
Air
Heat Exchanger Element
(Heat Recovery)
Normal (Bypass) mode
Exhaust
Air
Outdoor
Air
Heat Exchanger Element
(Heat Recovery)
Reduction of
heating / cooling
load (%)
0%
Normal
operation
: http://splitoff.ru/tehn-doc.html
Return
Air
Supply
Air
Heat Exchanger Element
(Heat Recovery)
Decision of mode
(Which is more
energy efficient?)
Normal ventilation (Bypass)
Heat recovery ventilation
Heat recovery ventilation
Normal ventilation (Bypass)
Return
Air
Supply
Air
(HC0231)
Return
Air
Supply
Air
(HC0232)
26%
20%
HRV independent Interlocked
operation operation
Features
1
(HC0008)
(HC0230)
Automatic
Changeover
(HC0233)
39