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Ease of operation

Flexible load / temperature operation

Characteristic features 

Performance curves 

Ease of operation

Where the economy and flexibility is the primary requirement, our units can be controlled by a single operator with simple manual operation.  Operators are quick to draw a parallel with ammonia compressor systems, and adapt easily to absorption systems.

In larger plants, operation is automatic with three control loops.

Evaporator feed control.
Absorber level control.
Steam regulation for capacity control

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Flexible load / temperature operation

Like compressor units, Ammonia absorption units can be turned down on load for lower evaporator temperatures.  But the comparison ends here.

Unlike compressors, AAR units can compensate for fluctuations in cooling water temperature and load fluctuations, simply by increasing the heat supplied.  For example; take a unit designed for 20TR, -5oC, 130oC steam, 32oC cooling water.

An load of 25TR will drop the temperature to about 0oC, in both compressor and absorption units, other conditions being the same.  But lifting the steam temperature to about 140oC would restore -5oC, at 25TR load.  This flexibility is not available with compressors.

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Characteristic features of Guha AAR systems

Simple gravity reflux feed without pure ammonia pump.
Skid-mounted, pre-assembled installation cuts down erection and commissioning time to a matter of days.  
Our fool-proof rectifier design ensures low L/G ratio, allowing lower turn-down ratios and high operating efficiency.  Other packed tower designs suffer from fouling, thermal cracking and channeling.  That can be catastrophic, leading to water carry-over to evaporator, and plant shut-down.
Low ammonia hold-up in our units ensures low hazard operation. 
Standard multi-stage boiler feed water pumps, with standby, ensure ease of maintenance and reliability. 
Implements latest GAX and solution cooled absorbers for maximum energy utilization.
Cooling water is provided on the tube side for easy, mechanical cleaning.  

Check out our Articles / News section for technical articles, and links to some competitors web pages.  Compare the features for yourself!

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Performance curves

The figures below represent the best possible performance curves of our Ammonia absorption systems.  

To draw an operating cost comparison with Compressor systems, the typical power consumption of an ammonia based compressor is shown below.  It is quite easy to see that higher operation temperatures will favor compressor operation, when a nominal cost is incurred for steam / heat generation.  At lower temperatures, the unit electricity consumption for compressors increases steeply, and the balance tilts in favor of ammonia absorption.  If waste heat / steam is available, the equation favors ammonia absorption entirely.  Case studies are available in the Articles / News section.

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