ENVIRONMENTALLY FRIENDLY TECHNOLOGY
Speedy digital PID control
The introduction of new digital PID control to the
chilled/hot water temperature. It is suitable for
SUPER ABSORPTION
Optimum dilution cycle period can be shortened substantially according to microprocessor monitoring
This results in the appropriate dilution cycle operating hours.
Graph 6. Dilution cycle (DE)
Control of high temperature generator by solution level control
With the new control system, solution flow rate is precisely controlled so | getic effect of absorbent pump inverter control. This enables the supply |
that the solution level of the high temperature generator is maintained at | of a more stable temperature for chilled/hot water compared to conven- |
a certain level. | tional models. |
Frequency of maneuvering has been substantially reduced with the syner- |
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Graph 4. Operating result by speedy PID control
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| Continuous operation of E model absorbent pump |
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Absorbent | ON |
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pump | OFF |
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| Conventional pump |
| E model |
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| Conventional |
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Temperature | 12 |
| Chilled water inlet temperature | Load change |
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(° C) |
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| E model |
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Temperature | 8 |
| Chilled water outlet temperature |
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setting 7° C |
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| Conventional |
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| Load factor 80% |
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| Load factor 40% |
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| 0 |
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| 0 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 |
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| Time(minutes) |
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Saving energy with the inverter
Balancing the load and flow rate with the absorbent pump’s inverter con- trol enables efficient and energy saving operation. As a result, it saves the input energy and electric power consumption, running cost by 5%
compared to
Graph 5. Running cost curve | Table 4. Test condition |
Operation | ON |
signal | OFF |
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Chiller / | ON |
heater | OFF |
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Cooling water | ON |
pump | OFF |
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Chilled / hot | ON |
water pump | OFF |
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| 1 min |
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| T 1 |
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| 1 min |
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| T 2 |
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Stop signal |
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| Chiller stop |
T1: Count the time until generator temperature goes down to 120° C (About 4 to 20 minutes)
T2: Decide the time by generator temperature. (About 5 to 10 minutes)
Note :
1)Dilution time in cooling operation is minimum 6 minutes to maximum 15 minutes.
2)Dilution time in heating operation is 5 minutes.
Unit proper and hot water pump stop in 5 minutes after stop signal is lit.
3)Stop the air conditioning system after complete stop of chiller.
Purge system
The high performance purge system maintains the required operating pressure, preserves the chiller performance characteristics, minimizes chiller maintenance as one purge time operation per season in case there are four(4) seasons.
Steam valve opening control
Graph 7. Start up chart (NE) |
ex. |
| 100 |
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ratio(%) | 80 |
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60 |
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consumption |
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40 |
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Fuel |
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20 |
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| 0 | 20 | 40 | 60 | 80 | 100 |
Cooling load factor(%)
1.Chilled water outlet temperature 7° C constant
2.Cooling water inlet temperature
Load factor(%) | Temperature(° C) |
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100 | 32 |
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50 | 27 |
30 | 25 |
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| 15minutes |
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| 30minutes |
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| 140 |
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| Steam consumption |
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| 120 |
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Temperature (° C) |
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| Consumption ratio (%) | control opening ratio (%) | |
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| 100 | |||
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40 |
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| Steam control valve |
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| 80 | ||||||||
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| opening ratio |
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30 |
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| Cooling water inlet temperature |
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20 |
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| Chilled water inlet temperature |
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Setting |
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| Chilled water outlet temperature |
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7° C | 0 |
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| 0 | 5 | 7 8 | 15 |
| 20 | 25 |
| 30 | 35 | 40 |
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Open angle of steam control valve at starting is controlled by means of the three steps, resulting that the excessive amount of steam and also the consumed time to reach the desired level became less than the previous model.
Of course, by means of adjusting the open speed of steam control valve at the second step and the third, it is possible to set up to the most suitable condition met to the site aux- iliary equipment.
Time(minutes)
8 | 9 |