|
Ammonia
Absorption Refrigeration Plant & Single Effect Lithium
Bromide Absorption Refrigeration Plants for Chilled Water
Application |
|
|
| Ammonia
Absorption Refrigeration Plant |
Single
Effect Lithium Bromide Absorption Chiller |
|
|
|
| Application Range |
: |
Application Range |
| Operating Temp.
Range: +5 to -60oC |
: |
Operating Temp
Range: +7 & above |
| Driving Heat
Source Temp Range : 85oC & above. |
: |
Driving Heat
Source Temp Range: 85oC & above |
| Cooling water
Temp: 35oC or below. |
: |
Cooling water
Temp: 35oC or below |
|
------------------- |
| Construction : |
: |
Construction : |
| Refrigerant -
Ammonia (NH3) |
: |
Refrigerant -
Water |
| Absorbent - Water |
: |
Absorbent -
Lithium Bromide (LiBr) |
|
------------------- |
| Material of
Construction |
: |
Material of
Construction |
| Plates - Carbon
Steel |
: |
Plates - Carbon
Steel |
| Tubes - Carbon
Steel |
: |
Tubes - Copper
Nickel Tubes |
| All welded
construction |
: |
Tubes to
tubesheet are expanded joint rest is welded construction |
| Operating System
pressure is above atmosphere upto (-30oC) |
: |
System is under
vacuum |
|
------------------- |
| Functioning |
: |
Functioning |
| - Fully automatic
continuous Modulation |
: |
- Fully automatic
continuous Modulation |
| - Part load
efficiency is good |
: |
- Part load
efficiency is good |
|
------------------- |
| Maintenance &
Spares |
: |
Maintenance &
Spares |
| - No Maintenance |
: |
- Vacuum
maintenance is critical functions and system life |
| - Tubes are
carbon steel & solution pumps are standard centrifugal
pumps. |
: |
- Copper Nickel
tubes & Hermetic pumps are very costly |
|
: |
- Copper Nickel
tubes need replacement periodically & hence repair
cost is high. |
|
------------------- |
| Life - Long life
of 25 years or more |
: |
Life - Entire
equipment life is not more than 15 years. |
|
------------------- |
| Corrosion |
: |
Corrosion is high |
| Corrosion is
negligible |
: |
Highly
susceptible to corrosion and therefore life can be limited
if vacuum is not maintained properly. Expanded tube-to-tubesheet
joints have tendency to leak periodically. |
|
------------------- |
| Due to low
corrosion repairs maintenance costs are very low |
: |
Due to corrosion
tube repairs and replacement is frequent. All tubes are
Copper or Copper Nickle Tubes. Therefore tube replacement
is very costly. |
|
------------------- |
| Due to pressurized
system; No special care is needed |
: |
Due to vacuum
System ; special care is needed otherwise plant stops frequently.
Also due to thousand of expanded tube to tubesheet joints,
the vacuum loss is frequent with passage of time. Fault
finding is very time consuming. |
|
------------------- |
| Chilled water
application : |
: |
Chilled water
application : |
| Chilled water
temperature |
: |
Chilled water temperature |
| 7oC
outlet |
: |
7oC
outlet |
| 12oC
return |
: |
12oC
return |
| Cooling water
temperature : 30oC |
: |
Cooling water
temperature: 30oC |
| Driving Heat
Sources temperature 85oC to 140oC |
: |
Driving Heat
Source temperature 85oC to 140oC |
| C.O.P.: 0.6 to
0.65 |
: |
C.O.P.: 0.6 to
0.65 |
|
|
|
| Conclusion
: Hot water driven AARP is a
more reliable Absorption System than Single Effect LiBr
Chiller for production of chilled water using hot water of
temperatures less than 100oC. |
