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Facilitating air-conditioning
design of elevator hall
Farthest equivalent length: 200 m
Contact: Toshiba Carrier Corporation, Products Planning Dept. Tel: +81-44-331-7414URL: http://www.toshiba-carrier.co.jp/
Installation in Practice
Effects or Remarks
O-37
Domestic This system has been delivered to office buildings, hotels, and educational institutes.
Overseas Sales were made in 20 countries. This system has been delivered to office buildings, hotels, and educational institutes.(Approximate annual sale of 2,350 systems in domestic and international markets)
� Comparison of COP with cooling/heating switching type The latest model (marketed since September 2012) is based on two improved technologies: The first one distrib-
utes the heat exchange volume of the outdoor heat exchanger using electronic control valves in the simultaneous cooling/heating operation; the second one, exhaust heat recovery technology, minimizes the heat exhaust from outdoor units using the optimal control of compressors and outdoor fans and also makes effective use of this heat as the heat source for indoor units. These technologies improved the simultaneous cooling/heating COP(*1) by about 45 % over the average COP(*2) of the cooling/heating rating.
(*1) Energy consumption efficiency of the simultaneous cooling/heating operation: A maximum value derived by calculation of "(Cooling capacity + Heating capacity) / Power consumption" when using a connection of an 8-HP outdoor unit and four 2-HP indoor units of ceiling cassette and four-direction exhaust type. Other assumed conditions are outdoor air at 7 °C, two indoor units currently cooling (room temperature of 27/19 °C DB/WB) and two indoor units currently heating (room temperature at 20 °C).
(*2) Average energy consumption efficiency of cooling/heating: A value calculated according to the JIS B 8615-1 conditions, using a connection of 8-HP outdoor unit and two 4-HP indoor units of ceiling cassette and four-direction exhaust type with reference piping (equivalent length of 7.5 m and drop of 0 m).
(*3) As of April 2012(Source: Toshiba Carrier)
� High flexibility in piping design Although allowing for coexistence of cooling and heating operations with one
refrigerant pipe, a high flexibility in piping design is available, supporting a height difference between indoor units: 40 m and a farthest equivalent length: 200 m. Thus this system can be installed even in large buildings.
or Schedule
Heat exhaustion
Outdoor fan
Outdoor heat exchanger
Compressor
Outdoor unit
Indoor unit
Indoor unit
Flow of refrigerant
Flow of refrigerant
Flow selector unit
Liquid pipe
Suction gas pipe
Indoor unit #1 (Cooling)
Indoor unit #2 (Cooling)
Indoor unit #1 (Heating)
Indoor unit #2 (Cooling)
Indoor unit #3 (Heating)
Indoor unit #4 (Heating)
Indoor unit #3 (Cooling)
Indoor unit #4 (Cooling)
Suctiongas pipe
Discharge gas pipe
Liquid pipe
Indoor heat exchange
Indoor heat exchange
Electronic control valve
Electronic control valve
Indoor fan
Solenoidvalve
Indoor fan
Outdoor unit
Outdoor fan
Outdoor heat exchanger
Compressor
Heat exhaustion
Heat exhaustion
Heat absorption
Heat absorption
Heat absorption
Heat absorption
Heat absorption
Heat absorption
Heat absorption
Heat exhaustion
Cooling/heating switching type Flow of refrigerant during cooling operation
Heat-recovery type Flow of refrigerant during simultaneous cooling/heating operation
Keywords
Features
Basic Concept or Summary
Heat-Recovery Multi-Split Air Conditioning System for Building Use
device Z4 electricity
Toshiba Carrier Corporation
O-37 Y2 E29 electrical machinery
� Heat-recovery multi-split air-conditioning system that can provide simultaneous cooling and heating from indoor units in this system- This system, allowing flexible selection of cooling or heating operation for each of the indoor units, is
suitable for space with mixed cooling and heating operations such as rooms with large temperature differences due to solar radiation or heat generation of OA equipment.
- From morning to evening, cooling and heating are switched according to the loads of indoor units, thus maintaining comfort.
� Automatic switching between cooling and heating at a setting temperature ± 1.5 °C- A high-speed vector inverter is equipped to control the number of revolutions of the high-efficiency
DC twin rotary compressor in 0.1 Hz increments, thus enabling fine capacity control to maintain the setting temperature and realize high-level comfort.
� Air-conditioning system using a heat-pump cycle Air-conditioning system for buildings uses heat-pump cycles of compression, condensation, expansion,
and evaporation. In the case of a type that does not allow mixed cooling and heating operations (cooling/heating switching type), cooling is done by an indoor unit that absorbs heat and an outdoor unit that exhausts heat. On the other hand, heating is done the other way around, by an outdoor unit that absorbs heat and an indoor unit that exhausts heat. In contrast, the heat-recovery type has an additional unit that can change the flow direction of the refrigerant. It allows an indoor unit to simultaneously use absorbed and exhausted heat and enable mixed operation of cooling and heating. Furthermore, heat absorbed by one indoor unit that conducts cooling operation can be used as heat exhausted by another indoor unit that conducts heating operation in the other room, thus achieving an energy saving effect. Additionally, adjusting absorbed and exhausted heat also between outdoor units by dividing the heat exchanger will optimize the heat exchange volume of the entire system and enable smooth response to ability variations of indoor units.
S5 renewable energy
Cooling/heating switching type: Cycle configuration during cooling operation
Heat-recovery type: Cycle configuration during simultaneous cooling/heating operation
Night
Heating zone
Cooling zone
Setti
ng te
mpe
ratu
re
▼24
Morning Noon
Only ± 1.5 °C temperature fluctuation
Cooling operation Heating operationThermo OFF
Example of using multi-air-conditioning systems providing simultaneous cooling and heating for large buildings
Electronic control valve
Electronic control valve
Electronic control valve
Outdoor heat exchanger (condenser)
Indoor heat exchanger (evaporator) Indoor heat
exchanger (evaporator)
Indoor unit #1 (Cooling)
Indoor unit #2 (Cooling)
Indoor unit #3 (Cooling)
Indoor unit #4 (Cooling)
Indoor unit #1 (Heating)
Indoor unit #3 (Heating)
Indoor unit #2 (Cooling)
Indoor unit #4 (Cooling)
Thermo OFFHeating operation
Electronic control valve
Outdoor heat exchanger (condenser)
Outdoor heat exchanger (condenser)
Outdoor heat exchanger (evaporator)
Compressor
Compressor
Heat exhaustion
Heat exhaustion
Heat absorption
Heat absorption
Condensation process
Condensation process
Compression process
Compression process
Expansion process
Expansion processEvaporation
process Evaporation process
Temperature change during automatic cooling/heating operation
146
Source:JASE-W Japanese Smart Energy Products & Technologieshttps://www.jase-w.eccj.or.jp/technologies/index.html
Facilitating air-conditioning
design of elevator hall
Farthest equivalent length: 200 m
Contact: Toshiba Carrier Corporation, Products Planning Dept. Tel: +81-44-331-7414URL: http://www.toshiba-carrier.co.jp/
Installation in Practice
Effects or Remarks
O-37
Domestic This system has been delivered to office buildings, hotels, and educational institutes.
Overseas Sales were made in 20 countries. This system has been delivered to office buildings, hotels, and educational institutes.(Approximate annual sale of 2,350 systems in domestic and international markets)
� Comparison of COP with cooling/heating switching type The latest model (marketed since September 2012) is based on two improved technologies: The first one distrib-
utes the heat exchange volume of the outdoor heat exchanger using electronic control valves in the simultaneous cooling/heating operation; the second one, exhaust heat recovery technology, minimizes the heat exhaust from outdoor units using the optimal control of compressors and outdoor fans and also makes effective use of this heat as the heat source for indoor units. These technologies improved the simultaneous cooling/heating COP(*1) by about 45 % over the average COP(*2) of the cooling/heating rating.
(*1) Energy consumption efficiency of the simultaneous cooling/heating operation: A maximum value derived by calculation of "(Cooling capacity + Heating capacity) / Power consumption" when using a connection of an 8-HP outdoor unit and four 2-HP indoor units of ceiling cassette and four-direction exhaust type. Other assumed conditions are outdoor air at 7 °C, two indoor units currently cooling (room temperature of 27/19 °C DB/WB) and two indoor units currently heating (room temperature at 20 °C).
(*2) Average energy consumption efficiency of cooling/heating: A value calculated according to the JIS B 8615-1 conditions, using a connection of 8-HP outdoor unit and two 4-HP indoor units of ceiling cassette and four-direction exhaust type with reference piping (equivalent length of 7.5 m and drop of 0 m).
(*3) As of April 2012(Source: Toshiba Carrier)
� High flexibility in piping design Although allowing for coexistence of cooling and heating operations with one
refrigerant pipe, a high flexibility in piping design is available, supporting a height difference between indoor units: 40 m and a farthest equivalent length: 200 m. Thus this system can be installed even in large buildings.
or Schedule
Heat exhaustion
Outdoor fan
Outdoor heat exchanger
Compressor
Outdoor unit
Indoor unit
Indoor unit
Flow of refrigerant
Flow of refrigerant
Flow selector unit
Liquid pipe
Suction gas pipe
Indoor unit #1 (Cooling)
Indoor unit #2 (Cooling)
Indoor unit #1 (Heating)
Indoor unit #2 (Cooling)
Indoor unit #3 (Heating)
Indoor unit #4 (Heating)
Indoor unit #3 (Cooling)
Indoor unit #4 (Cooling)
Suctiongas pipe
Discharge gas pipe
Liquid pipe
Indoor heat exchange
Indoor heat exchange
Electronic control valve
Electronic control valve
Indoor fan
Solenoidvalve
Indoor fan
Outdoor unit
Outdoor fan
Outdoor heat exchanger
Compressor
Heat exhaustion
Heat exhaustion
Heat absorption
Heat absorption
Heat absorption
Heat absorption
Heat absorption
Heat absorption
Heat absorption
Heat exhaustion
Cooling/heating switching type Flow of refrigerant during cooling operation
Heat-recovery type Flow of refrigerant during simultaneous cooling/heating operation
Keywords
Features
Basic Concept or Summary
Heat-Recovery Multi-Split Air Conditioning System for Building Use
device Z4 electricity
Toshiba Carrier Corporation
O-37 Y2 E29 electrical machinery
� Heat-recovery multi-split air-conditioning system that can provide simultaneous cooling and heating from indoor units in this system- This system, allowing flexible selection of cooling or heating operation for each of the indoor units, is
suitable for space with mixed cooling and heating operations such as rooms with large temperature differences due to solar radiation or heat generation of OA equipment.
- From morning to evening, cooling and heating are switched according to the loads of indoor units, thus maintaining comfort.
� Automatic switching between cooling and heating at a setting temperature ± 1.5 °C- A high-speed vector inverter is equipped to control the number of revolutions of the high-efficiency
DC twin rotary compressor in 0.1 Hz increments, thus enabling fine capacity control to maintain the setting temperature and realize high-level comfort.
� Air-conditioning system using a heat-pump cycle Air-conditioning system for buildings uses heat-pump cycles of compression, condensation, expansion,
and evaporation. In the case of a type that does not allow mixed cooling and heating operations (cooling/heating switching type), cooling is done by an indoor unit that absorbs heat and an outdoor unit that exhausts heat. On the other hand, heating is done the other way around, by an outdoor unit that absorbs heat and an indoor unit that exhausts heat. In contrast, the heat-recovery type has an additional unit that can change the flow direction of the refrigerant. It allows an indoor unit to simultaneously use absorbed and exhausted heat and enable mixed operation of cooling and heating. Furthermore, heat absorbed by one indoor unit that conducts cooling operation can be used as heat exhausted by another indoor unit that conducts heating operation in the other room, thus achieving an energy saving effect. Additionally, adjusting absorbed and exhausted heat also between outdoor units by dividing the heat exchanger will optimize the heat exchange volume of the entire system and enable smooth response to ability variations of indoor units.
S5 renewable energy
Cooling/heating switching type: Cycle configuration during cooling operation
Heat-recovery type: Cycle configuration during simultaneous cooling/heating operation
Night
Heating zone
Cooling zone
Setti
ng te
mpe
ratu
re
▼24
Morning Noon
Only ± 1.5 °C temperature fluctuation
Cooling operation Heating operationThermo OFF
Example of using multi-air-conditioning systems providing simultaneous cooling and heating for large buildings
Electronic control valve
Electronic control valve
Electronic control valve
Outdoor heat exchanger (condenser)
Indoor heat exchanger (evaporator) Indoor heat
exchanger (evaporator)
Indoor unit #1 (Cooling)
Indoor unit #2 (Cooling)
Indoor unit #3 (Cooling)
Indoor unit #4 (Cooling)
Indoor unit #1 (Heating)
Indoor unit #3 (Heating)
Indoor unit #2 (Cooling)
Indoor unit #4 (Cooling)
Thermo OFFHeating operation
Electronic control valve
Outdoor heat exchanger (condenser)
Outdoor heat exchanger (condenser)
Outdoor heat exchanger (evaporator)
Compressor
Compressor
Heat exhaustion
Heat exhaustion
Heat absorption
Heat absorption
Condensation process
Condensation process
Compression process
Compression process
Expansion process
Expansion processEvaporation
process Evaporation process
Temperature change during automatic cooling/heating operation
147
Source:JASE-W Japanese Smart Energy Products & Technologieshttps://www.jase-w.eccj.or.jp/technologies/index.html