Energy Saving - Daikin VRV-WIII RWEYQ72PTJU Service Manual

Features
1.3

Energy Saving

Heat Recovery
Daikin now offers 2-stage Heat Recovery operation.
The first stage of Heat Recovery operation is within the refrigerant system. By controlling the Branch
Selector unit that switches cooling and heating, simultaneous cooling and heating operation is made
possible, with Heat Recovery performed between indoor units.
The second stage of Heat Recovery operation is within
the water loop, where Heat Recovery is performed
between the VRV-W
This 2-stage Heat Recovery operation substantially
improves energy efficiency and makes the system the
ideal solution to the requirements of modern office
buildings, where some areas may require cooling even in
winter, depending on the amount of sunshine received
and the number of people in the room.
Simultaneous heating and cooling operation
within the refrigerant system.
In mainly cooling, partly heating mode, the system recycles
heat discharged from the cooling operation to use for heating.
In mainly heating, partly cooling mode, the system uses cooled
post-heating operation refrigerant for cooling. Efficiency
improves the more simultaneous operation is performed.
The first stage: Between indoor units
A
Heat radiation operation
(all cooling operation)
Heat
rejected
B
Heat radiation tendency
Heat Recovery operation
(mainly cooling, part heating
operation)
Heat rejected
to loop
C
Heat Recovery operation
(cooling and heating operation)
D
Heat absorption tendency
Heat Recovery operation
(mainly heating, part cooling
operation)
Heat absorption
E
Heat absorption operation
(all heating operation)
Notes: • Operation modes (A) and (E) are applicable when the outdoor air temperature is 95°F and 32°F respectively; The other modes are applicable under typical outside conditions.
• Above system configurations are for illustration purposes only.
6
units.
Stage 1
VRV-W
cooling cooling cooling
VRV-W
cooling cooling cooling
VRV-W
cooling cooling heating
VRV-W
cooling heating heating
VRV-W
heating heating heating
Heat Recovery operation between
the VRV-W
Heat Recovery operation is also available between
systems connected to the same water loop, with systems
exchanging heat via water. This increases energy
efficiency.
The second stage: Between VRV-W
Heat transfer
Cooling tower (Closed type), boiler
cooling
Heat rejected
to loop
heating
Heat rejected
to loop
heating
Heat absorption
heating
from loop
Heat absorption
heating
from loop
Stage 2
units.
units
VRV-W
cooling cooling cooling
VRV-W
cooling cooling cooling
VRV-W
heating heating heating
VRV-W
heating heating heating
General Information
SiUS30-1301