• High-efficiency, model EX

High-efficiency, model EX

High-efficiency, model EX / Rated COP = 1.50*1 Absorption Chiller-heater

*1: Model EXA (gas-fired (LHV basis), 15-7℃ chilled water temperature condition

Features

Features of the high-efficiency EX series

Efficiency improved by approx. 34% compared with previous models*2.
Ideally suited to filling the need to reduce air-conditioning energy costs and improve energy efficiency.
The longer users operate the unit throughout the year, the greater the benefits of conserving the energy in operation that are achieved.

*1 Model EXA (gas-fired (LHV basis), 15-7℃ chilled water temperature condition

Efficiency improved by approx. 34% compared with previous models*2

*2 Comparison with previous model V series: 13A gas-fired/cooling mode/Chilled water large temperature differential

Hitachi’s lineup of absorption chiller-heaters (120 to 1,000 USRT)

Series Energy efficiency level*3 Fuel
13A Gas Kerosene Diesel oil
EX 45%
EXH 42%
EXS 40% *4

*3 The energy efficiency level given here is for Japanese 13A gas and in case of chilled water large temperature differential.
*4 Please contact us in regard to Diesel oil fired for EXS series.

Improved efficiency and smaller foot print

Improved efficiency supported by 2-step evaporation and absorption cycle

Higher efficiency has been achieved by the use of a 2-step evaporation and absorption cycle. This cycle is divided into two steps: an upper step and a lower step.
By ensuring that the chilled water has a temperature of 15°C to 11°C and that the cooling water has a temperature of 32°C to 34.5°C for the cycle in the lower step, the concentration of the solution can be reduced to the same level as for low load operation.

As a result, a large difference in the concentration between the generator and absorber can be realized, making it possible to reduce the volume of the circulating solution. In this way, by diminishing the volume of the circulating solution, the amount of heat loss due to the cooling water and the heat generated by the high-temperature generator are reduced and a higher efficiency is successfully achieved for the cycle.

Downsizing: Small-diameter heat-transfer tubes and tube bank layout

Employing small-diameter heat-transfer tubes and optimizing the tube bank layout have resulted in improved performance of the evaporator, absorber, condenser, and low-temperature generator.

Improved efficiency: Heat exchangers

The internal cycle heat loss is recovered and high-level efficiency is realized by the low-temperature generator drain heat exchanger.


Improved efficiency: High-performance heat exchangers

Newly employed welded plate-type solution heat exchangers easily enables realization of improved efficiency and downsizing. By connecting them in series, the optimum flow rate is assured even when small volumes of solution circulate, achieving both improved efficiency and greater compactness.


Model variation

PARTIAL LOAD HIGH-EFFICIENCY ABSORPTION CHILLER-HEATERS

Partial load efficiency has been dramatically improved.

[EXP series] (120 to 1,000USRT)

Specifications

EX series (gas: 45% energy efficiency model)
Chilled water: 15-7℃,
Cooling water: 32-37℃,
Hot water outlet 60℃ [Chilled water large temperature differential]

Model
HAU-BGN(BGH)
120
EXA
150
EXA
180
EXA
210
EXA
240
EXA
280
EXA
Cooling capacity USRT 120 150 180 210 240 280
kW 422 527 633 738 844 985
Heating capacity Mcal/h 290
(363)
363
(436)
436
(508)
508
(581)
581
(678)
678
(726)
kW 337
(422)
422
(507)
507
(591)
591
(676)
676
(788)
788
(844)
Model
HAU-BGN(BGH)
300
EXA
360
EXA
400
EXA
450
EXA
500
EXA
560
EXA
Cooling capacity USRT 300 360 400 450 500 560
kW 1,055 1,266 1,407 1,582 1,758 1,969
Heating capacity Mcal/h 726
(775)
860
(1,110)
860
(1,110)
1,110
(1,387)
1,110
(1,387)
1,387
(1,665)
kW 844
(901)
1,000
(1,291)
1,000
(1,291)
1,291
(1,613)
1,291
(1,613)
1,613
(1,936)
Model
HAU-BGN(BGH)
630
EXA
700
EXA
750
EXA
800
EXA
900
EXA
1000
EXA
Cooling capacity USRT 630 700 750 800 900 1000
kW 2,215 2,461 2,637 2,813 3,165 3,516
Heating capacity Mcal/h 1,387
(1,665)
1,665
(1,947)
1,665
(1,947)
1,947
(2,318)
1,947
(2,318)
2,319
(2,800)
kW 1,613
(1,936)
1,936
(2,264)
1,936
(2,264)
2,264
(2,695)
2,264
(2,695)
2,695
(3,256)

* The temperature of the cooling water for the 1000EXA is 32°C to 37.8°C.
* The values shown in parentheses in the product lists are for the increased heating models.
* The standard chilled water temperature difference 12-7℃ is also available.

EXH series (gas/kerosene: 42% energy efficiency model/Diesel oil: 41% energy efficiency model)
Chilled water: 15-7℃
Cooling water: 32-37℃,
Hot water outlet 60℃ [Chilled water large temperature differential]

Model
HAU-BGN/BKN/BAN
(HAU-BGH/BKH/BAH)
120
EXHA
150
EXHA
180
EXHA
210
EXHA
240
EXHA
280
EXHA
Cooling capacity USRT 120 150 180 210 240 280
kW 422 527 633 738 844 985
Heating capacity Mcal/h 332
(386)
332
(386)
430
(464)
554
(618)
554
(618)
670
(824)
kW 386
(449)
386
(449)
500
(540)
644
(719)
644
(719)
779
(958)
Model
HAU-BGN/BKN/BAN
(HAU-BGH/BKH/BAH)
300
EXHA
360
EXHA
400
EXHA
450
EXHA
500
EXHA
560
EXHA
Cooling capacity USRT 300 360 400 450 500 560
kW 1,055 1,266 1,407 1,582 1,758 1,969
Heating capacity Mcal/h 670
(824)
860
(1,110)
860
(1,110)
1,110
(1,387)
1,110
(1,387)
1,387
(1,665)
kW 779
(958)
1,000
(1,291)
1,000
(1,291)
1,291
(1,613)
1,291
(1,613)
1,613
(1,936)
Model
HAU-BGN/BKN/BAN
(HAU-BGH/BKH/BAH)
630
EXHA
700
EXHA
750
EXHA
800
EXHA
900
EXHA
1000
EXHA
Cooling capacity USRT 630 700 750 800 900 1000
kW 2,215 2,461 2,637 2,813 3,165 3,516
Heating capacity Mcal/h 1,387
(1,665)
1,665
(1,947)
1,665
(1,947)
1,947
(2,318)
1,947
(2,318)
2,318
(2,800)
kW 1,613
(1,936)
1,936
(2,264)
1,936
(2,264)
2,264
(2,695)
2,264
(2,695)
2,695
(3,256)

* The temperature of the cooling water for the 1000EXHA is 32°C to 37.8°C.
* The values shown in parentheses in the product lists are for the increased heating models.
* The standard chilled water temperature difference 12-7℃ is also available.

EXS series ((gas/kerosene: 39% energy efficiency model)
Chilled water: 15-7℃
Cooling water: 32-37℃,
Hot water outlet 60℃ [Chilled water large temperature differential]

Model
HAU-BGN/BKN
(HAU-BGH/BKH)
120
EXSA
150
EXSA
180
EXSA
210
EXSA
240
EXSA
280
EXSA
Cooling capacity USRT 120 150 180 210 240 280
kW 422 527 633 738 844 985
Heating capacity Mcal/h 332
(386)
332
(386)
430
(464)
554
(618)
554
(618)
670
(824)
kW 386
(449)
386
(449)
500
(540)
644
(719)
644
(719)
779
(958)
Model
HAU-BGN/BKN
(HAU-BGH/BKH)
300
EXSA
360
EXSA
400
EXSA
450
EXSA
500
EXSA
560
EXSA
Cooling capacity USRT 300 360 400 450 500 560
kW 1,055 1,266 1,407 1,582 1,758 1,969
Heating capacity Mcal/h 670
(824)
860
(1,110)
860
(1,110)
1,110
(1,387)
1,110
(1,387)
1,387
(1,665)
kW 779
(958)
1,000
(1,291)
1,000
(1,291)
1,291
(1,613)
1,291
(1,613)
1,613
(1,936)
Model
HAU-BGN/BKN
(HAU-BGH/BKH)
630
EXSA
700
EXSA
750
EXSA
800
EXSA
900
EXSA
1000
EXSA
Cooling capacity USRT 630 700 750 800 900 1000
kW 2,215 2,461 2,637 2,813 3,165 3,516
Heating capacity Mcal/h 1,387
(1,665)
1,665
(1,947)
1,665
(1,947)
1,947
(2,318)
1,947
(2,318)
2,318
(2,800)
kW 1,613
(1,936)
1,936
(2,264)
1,936
(2,264)
2,264
(2,695)
2,264
(2,695)
2,695
(3,256)

* The temperature of the cooling water for the 1000EXSA is 32°C to 38°C.
* The values shown in parentheses in the product lists are for the increased heating models.
* The standard chilled water temperature difference 12-7℃ is also available.