• Double-effect steam absorption chillers

Double-effect steam absorption chillers

High-Efficiency Double-Effect Steam Absorption Chiller(EX series)

422〜7,032kW (120〜2,000USRT) [Steam-fired]

Features

15% reduction in operating costs per annum thanks to greater energy efficiency [a further reduction of 20% over the models that have been used for 15 years]

The successful achievement of a steam consumption rate of 3.5 kg/h・RT. Constitutes the highest level of energy efficiency in the industry,*1 and allows to excel in reducing operating costs in applications such as production processes and clean rooms where they operate for long period of time.

*1 In the case of a double-effect unit

Operating costs saved by 9 million (JPY) per annum (compared with conventional model V series / 500RT); energy efficiency improved by 20% and operating costs saved by 12 million (JPY) per annum by replacing the chiller that have been used for 15 years

 
*2 large temperature differential for the chilled water
  Standard temperature difference: 5°C difference in temperature Large temperature difference: 8°C difference in temperature Effect
Chilled water supply temperature 7℃  
Water supply pump power (head:25m) 55kW 30kW Power equivalent to 25 kW (45%) saved
Piping size 200A 150A Cost of the installation work reduced by using smaller pipe sizes

High efficiency achieved by innovation and advanced technology

This double-effect steam absorption chiller uses a 2-stage evaporation and absorption cycle and plate heat exchanger. As a result, it reduces heat loss and achieves high efficiency easily while assuring high reliability and long life with a low concentration cycle.

*3 Intermediate temperature indicated in the image is for reference only.

Conserving energy by suppressing water conveying power.

Capable of Cooling water variable-flow system (option)

Conserving energy by suppressing the electricity consumed at cooling water pump. By monitoring the internal cycle (temperature, pressure, and concentration of the high-temperature generator), and while keeping a stable operating condition of the absorption chiller-heater, the appropriate variable-flow signals are output to the pump inverter to optimize the cooling water flow rate.

Chiller operation and maintenance control is supported while assuring the reliability and durability to a high level, and improving the operability and maintainability.
4,000 hours of annual operation is supported as a standard

Using the standard frame, a total of 4,000 hours of cooling operations per annum are supported.
By improving both reliability and durability, for example, by employing the 2-step cycle, it is ideal also for those users who intend to run the chiller for long periods.

Operation management is supported by highly functional microcomputer control panel and offering a remote monitoring service (option)

Preventive maintenance: Chilled water super-cooling prevention control, excessive solution concentration prevention control and refrigerant super-cooling prevention control
Trouble prediction: Cooling water temperature trouble, abnormal purge frequency trouble, cooling water tube contamination
Users can receive our remote monitoring service by signing an agreement (option) with our affiliated service company, Hitachi Building Systems Co., Ltd.

High operability and maintainability

Trouble status and operating status can easily be grasped by LED and LCD screen indication.
Remote start/stop, operating status signals, chilled water outlet remote setting (option) and others supporting the users Central monitoring systems.
Airtight management is the most concern of the daily maintenance. Hitachi’s proprietary “Water ejector type full automatic purge system” frees you from the manual purge pump operation.

Hitachi absorption chiller lineup

Series Steam consumption rate*4 Capacity range
EX 3.5kg/h・RT 120~2,000USRT
EXS 3.8kg/h・RT

*4: The steam consumption rate is based on saturated steam pressure of 784 kPa(G) and the ‘Large chilled water temperature differential” catalogue standard specification.

Model Variation

PARTIAL LOAD EFFICIENCY HAS SIGNIFICANTLY BEEN IMPROVED
HIGH PARTIAL LOAD EFFICIENCY STEAM ABSORPTION CHILLERS (EXP SERIES)

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

MORE DETAILS ABOUT HIGH PARTIAL LOAD EFFICIENCY UNITS

<p>The operating profile of the chillers used for air conditioning over the course of the year is such that they are not usually operated for long periods of time under conditions close to 100% loads. They are normally operated under partial load conditions.<br>
Therefore, improving the energy consumption efficiency of the chillers in line with the fluctuations in the cooling load throughout the year leads to reductions in the amounts of energy consumed annually.<br>
High partial load efficiency absorption chillers feature significantly improved efficiency when operated under partial load conditions compared with standard models, contributing to reduction of the amounts of energy consumed annually.</p>

<figcaption class=”note”>*1 The values given as the steam consumption rate for both the EX and EXP are applied with a saturated steam pressure of 780 kPa(G) under Chilled water large temperature differential catalogue specification. Cooling water inlet temperature under 50% load is according to JIS conditions.</figcaption>

FEATURES OF PARTIAL LOAD HIGH EFFICIENCY EXP SERIES

The high-efficiency type (EX series) incorporating the 2-stage evaporation and absorption cycle are used as a base model of EXP series and by exercising inverter control over the solution pump, the volume of the circulating solution is optimized corresponding to the fluctuating load. The partial load efficiency has been increased by minimizing the heat loss and heat applied (amount of steam consumption) during partial load operation..

ADVANTAGES YIELDED BY THE 2-STAGE EVAPORATION AND ABSORPTION CYCLE

This cycle makes it possible to dilute the concentration of the absorption solution from the absorber to a greater extent than before, and the volume of solution circulating in the overall cycle to be reduced as a result. Reducing the solution volume enables the heat loss and heat applied by the high-temperature regenerator to be reduced, thus raising the efficiency of the cycle.

COOLING WATER VARIABLE-FLOW SYSTEMS ALSO SUPPORTED: OPTION

<p>The internal cycle of the absorption chiller (temperature, pressure, and concentration of the high-temperature generator) is monitored, and while maintaining the appropriate operating status, the appropriate variable-flow signals are output to the variable flow inverter of the cooling water pump.</p>

ENERGY SAVINGS AND ENVIRONMENTAL FRIENDLINESS

For the air conditioning used in industrial applications that involves partial load cooling operations throughout the year, operating costs and CO2 emissions are reduced by approx. 34%*2 . (Comparison of model EXP with the conventional N series applied 15 years ago)

*2: This percentage will differ depending on the estimate conditions. Refer to the calculation conditions stated above.

CHARACTERISTICS OF PARTIAL LOAD PERFORMANCE*3

Efficiency in the partial load has been improved by optimizing the volume of the circulating solution.

*3 Steam consumption rate stated above is based on steam inlet pressure 780 kPa(G), chilled water large temperature differential (15-7℃) catalogue standard specification. Cooling water inlet temperature is according to JIS conditions.

Specifications

EX and EXS series

■ Chilled water temperature : 15-7 ℃
Cooling water temperature : 32-37℃/
Steam pressure : 0.78 MPa(G) [Large chilled water temperature differential specification]
(steam consumption rate: 3.5 kg/h・RT for EXA, 3.8 kg/h・RT for EXSA)

Model
HAU-BW/CW
120
EXA
150
EXA
180
EXA
210
EXA
240
EXA
280
EXA
300
EXA
360
EXA
400
EXA
120
EXSA
150
EXSA
180
EXSA
210
EXSA
240
EXSA
280
EXSA
300
EXSA
360
EXSA
400
EXSA
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
Model
HAU-BW/CW
450
EXA
500
EXA
560
EXA
630
EXA
700
EXA
750
EXA
800
EXA
900
EXA
1000
EXA
450
EXSA
500
EXSA
560
EXSA
630
EXSA
700
EXSA
750
EXSA
800
EXSA
900
EXSA
1000
EXSA
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

* The cooling water temperature for the 1000EXA and 1000EXSA is 32°C to 38°C.

■ Chilled water temperature : 12-7℃
Cooling water temperature : 32-37℃
Steam pressure : 0.78 MPa(G) [Standard chilled water temperature differential specification]
(steam consumption rate: 3.6 kg/h・RT for EXA, 3.9 kg/h・RT for EXSA)

Model
HAU-BW/CW
120
EX
150
EX
180
EX
210
EX
240
EX
280
EX
300
EX
360
EX
400
EX
120
EXS
150
EXS
180
EXS
210
EXS
240
EXS
280
EXS
300
EXS
360
EXS
400
EXS
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
Model
HAU-BW/CW
450
EX
500
EX
560
EX
630
EA
700
EX
750
EX
800
EX
900
EX
1000
EX
450
EXS
500
EXS
560
EXS
630
EXS
700
EXS
750
EXS
800
EXS
900
EXA
1000
EXS
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

* The cooling water temperature for the 1000EXA and 1000EXSA is 32°C to 38°C.

EXPA SERIES (45% ENERGY SAVING MODEL)

■Chilled water temperature 15 -7 ℃
Cooling water temperature 32-37℃
Steam inlet pressure 0.78 MPa(G) [Chilled water large temperature differential specification]
(Steam consumption rate: [EXPA] 3.5 kg/h・RT, 「EXSPA] 3.8 kg/h・RT)

MODEL
HAU-BW/CW
120
EXPA
150
EXPA
180
EXPA
210
EXPA
240
EXPA
280
EXPA
300
EXPA
360
EXPA
400
EXPA
120
EXSPA
150
EXSPA
180
EXSPA
210
EXSPA
240
EXSPA
280
EXSPA
300
EXSPA
360
EXSPA
400
EXSPA
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
MODEL
HAU-BW/CW
450
EXPA
500
EXPA
560
EXPA
630
EXPA
700
EXPA
750
EXPA
800
EXPA
900
EXPA
1000
EXPA
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

■ Chilled water temperature 12-7 ℃, Cooling water temperature 32-37℃, Steam inlet pressure 0.78 MPa(G) [Chilled water standard temperature differential specification]
(Steam consumption rate: [EXP] 3.6 kg/h・RT, 「EXSP] 3.9 kg/h・RT)

MODEL
HAU-BW/CW
120
EXP
150
EXP
180
EXP
210
EXP
240
EXP
280
EXP
300
EXP
360
EXP
400
EXP
120
EXSP
150
EXSP
180
EXSP
210
EXSP
240
EXSP
280
EXSP
300
EXSP
360
EXSP
400
EXSP
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
MODEL
HAU-BW/CW
450
EXP
500
EXP
560
EXP
630
EXP
700
EXP
750
EXP
800
EXP
900
EXP
1000
EXP
450
EXSP
500
EXSP
560
EXSP
630
EXSP
700
EXSP
750
EXSP
800
EXSP
900
EXSP
1000
EXSP
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