Absorption Chiller

Enhanced efficiency - Gas/Oil

EX3/EX3P series [120 to 1,000USRT]

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]

EX3/EX3P series [120 to 1,000USRT]

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]

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.

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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.

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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

Specifications

Resources

Resources

Manuals, brochures and other product literature. If you need any more information, please get in touch.

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