Daikin BSVQ36MVJU, Service Manual

Page: 19 / 312

Features SiUS30-604
6 General Information
1.3 Energy saving
Heat recovery
In mainly cooling, partly heating mode, the system recycles
heat exhausted 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.
Notes: • Operation modes (A) and (E) are applicable when the outside 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.
Heat rejected
to loop
Heat rejected
to loop
Simultaneous heating and cooling operation
within the refrigerant system.
Heat recovery operation is also available between
systems connected to the same water loop, with systems
exchanging heat via water. This increases energy
efficiency.
Heat recovery operation between
the VRV-WII units.
Cooling tower (Closed type), boiler
cooling cooling cooling
cooling cooling cooling
The first stage: Between indoor units
The second stage: Between VRV-WII units
Heat absorption
from loop
Heat absorption
from loop
A
B
C
D
E
Heat radiation operation
(all cooling operation)
Heat radiation tendency
heat recovery operation
(mainly cooling,
part heating operation)
Heat recovery operation
(cooling and heating operation)
Heat absorption tendency
heat recovery operation
(mainly heating,
part cooling operation)
Heat absorption operation
(all heating operation)
Heat rejected
to loop
Heat absorption
Heat
rejected
cooling cooling cooling cooling
cooling heating cooling cooling
heating heating cooling cooling
heating heating heating cooling
heating heating heating heating
heating heating heating
heating heating heating
Daikin now offers 2-stage heat recovery operation.
The first stage of heat recovery operation is within the refrigerant system. By controlling the BS 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-WII units.
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.
Stage 1 Stage 2
VRV-WII
VRV-WII
VRV-WII
VRV-WII
VRV-WII
VRV-WII
VRV-WII
VRV-WII
VRV-WII
Heat transfer