• Enhanced efficiency absorption chiller-heaters

Enhanced efficiency absorption chiller-heaters

Enables system configuration of less electricity consumption.
Energy-Saving-Type Absorption Chiller (EX3/EX3P series)

422〜3,516kW (120〜1,000USRT) [Gas-fired / Oil-fired]

Features

More details about Partial load high-efficiency absorption chiller-heaters

The chillers used for air conditioning in buildings are usually not operated for long periods of time under conditions close to 100% load, and they are operated under partial load conditions for most of the time during a year. This means that it is critically important to improve the energy consumption efficiency in line with the fluctuations in the heat load throughout the year.
Hitachi’s Partial load high-efficiency absorption chiller-heaters significantly improved efficiency during operation under partial load conditions compared with previous models. It contributes to reduce the amounts of energy consumed annually.

Features of the Partial load high-efficiency units

The high-efficiency units (EX series) incorporating the 2-step evaporation and absorption cycle are used as base model and by exercising inverter control over the solution pump, the volume of the circulating solution is optimized in accordance with the fluctuating load.
The partial load efficiency has been drastically increased by minimizing the heat lost and heat generated (the volume of fuel consumed) during partial load operations.

Advantages of the 2-step evaporation and absorption cycle

This cycle makes it possible to dilute the concentration of the solution that goes out from the absorber to the greater than the conventional model and the volume of solution circulating in the overall cycle to be reduced as a result. Reducing this circulating solution volume enables the heat consumption at the high-temperature generator and the overall heat loss to be reduced, thus increasing the efficiency of the cycle.

Scope of applications for partial load high-efficiency model

EXP series: Capable of 13A Gas-fired only
EEXSP series: capable of 13A Gas, 12A Gas, LP Gas, kerosene *2:

*2: This applies to the Diesel oil fired, steam fired and Gene-Link type as well.

Energy savings and environmental friendliness

For industrial air conditioning that involves partial load cooling operations throughout the year and ordinary building air conditioning that involves cooling operations for three seasons—spring, summer and fall—our partial load high-efficiency models reduce operating costs and CO2 emissions by approx. 27% compared with the 26% energy saving model (Hitachi conventional V series absorption chiller-heater).

*3: Calculation conditions

Chiller type: Standard V series unit, Partial load high-efficiency EXSP and EXP series unit
Chiller specifications: 500 USRT, ‘Chilled water large temperature difference’ catalogue standard specification (cooling water inlet temperature: JIS conditions)
Air conditioning used in industrial applications: 50% average load, operation for 8,760 hours per annum
Air conditioning used for ordinary buildings: Approx. 40% average load, operation for 3,850 hours per annum
Rate unit prices: ¥53/m³ for 13A gas; ¥14/kWh for electricity
Emission factors: 2.19 kg/CO2/m³N for 13A gas; 0.339 kg/CO2/kWh for electricity

Characteristics of partial load performance

COP in the partial load range has been improved by Hitachi Partial load high-efficiency units by optimizing the solution circulation volume corresponding with the load fluctuation.

Notes

  1. For EXP type, EXHP type, and EXSP type are all based on gas-fired ‘Chilled water large temperature difference’ catalogue specification. Cooling water inlet temperature are based on JIS conditions.
  2. COP is LHV basis. The performance characteristic curve of the unit may differ from model to another so the values given serve as a general guideline only.
  3. The broken lines in the partial load characteristics curve shows Hitachi’s units with the equivalent levels of efficiency.

Specifications

EXPA series (45% energy efficiency model)

Chilled water large temperature differential specification

Model
HAU-BGN
120
EXPA
150
EXPA
180
EXPA
210
EXPA
240
EXPA
280
EXPA
300
EXPA
360
EXPA
400
EXPA
Cooling capacity USRT 120 150 180 210 240 280 300 360 400
kW 422 527 633 738 844 985 1,055 1,266 1,407
Heating capacity Mcal/h 290 363 436 508 581 678 726 706 785
kW 337 422 507 591 676 788 844 821 913
Temperature [Chilled/ hot water] [Chilled water] Inlet: 15°C, outlet: 7°C; [hot water] outlet: 60°C [Chilled water] Inlet: 15°C, outlet: 7°C; [hot water] outlet: 60°C
Cooling water Inlet: 32°C outlet:37℃
Model
HAU-BGN
450
EXPA
500
EXPA
560
EXPA
630
EXPA
700
EXPA
750
EXPA
800
EXPA
900
EXPA
1000
EXPA
Cooling capacity USRT 450 500 560 630 700 750 800 900 1,000
kW 1,582 1,758 1,969 2,215 2,461 2,637 2,813 3,165 3,516
Heating capacity Mcal/h 883 981 1,099 1,236 1,373 1,471 1,569 1,765 1,961
kW 1,027 1,141 1,277 1,437 1,597 1,710 1,824 2,052 2,280
Temperature [Chilled/ hot water] [Chilled water] Inlet: 15℃, outlet: 7℃; [hot water] outlet: 60°C
Cooling water Inlet: 32°C outlet:37℃ Inlet: 32°C
outlet:37.8℃

*Capable of coping with enhanced heating models. Refer to the absorption chiller-heater (high-efficiency EXS series) product lists for heating capacity of enhanced heating models.

EXPSA series (40% energy efficiency model)

Chilled water large temperature differential specification

Model
HAU-BGN
120
EXSPA
150
EXSPA
180
EXSPA
210
EXSPA
240
EXSPA
280
EXSPA
300
EXSPA
360
EXSPA
400
EXPA
Cooling capacity USRT 120 150 180 210 240 280 300 360 400
kW 422 527 633 738 844 985 1,055 1,266 1,407
Heating capacity Mcal/h 255 319 382 446 510 594 637 765 849
kW 297 371 444 519 593 691 741 890 987
Temperature [Chilled/ hot water] [Chilled water] Inlet: 15℃, outlet: 7℃; [hot water] outlet: 60℃
Cooling water Inlet: 32°C, outlet: 37.2°C
Model
HAU-BGN
450
EXSPA
500
EXSPA
560
EXSPA
630
EXSPA
700
EXSPA
750
EXSPA
800
EXSPA
900
EXSPA
1000
EXSPA
Cooling capacity USRT 450 500 560 630 700 750 800 900 1,000
kW 1,582 1,758 1,969 2,215 2,461 2,637 2,813 3,165 3,516
Heating capacity Mcal/h 956 1,062 1,189 1,338 1,487 1,593 1,699 1,911 2,124
kW 1,112 1,235 1,383 1,556 1,729 1,852 1,976 2,222 2,470
Temperature [Chilled/ hot water] [Chilled water] Inlet: 15℃, outlet: 7℃; [hot water] outlet: 60℃
Cooling water Inlet: 32°C, outlet: 37.2°C Inlet: 32°C
outlet: 38°C

*Increased heating models are also supported. For the heating capacity of these models, refer to the absorption chiller-heater (high-efficiency EXS series) product lists.