Wind Effect on Chiller

7/30/2019 Wind Effect on Chiller

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Summary of Existing Heat Loads

CHILLER EXISTING LOADS WITH MARGIN


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KEY ISSUES IMPACTING CHILLER PERFORMANCE

1. Plant Wind Directions Issue Impacts finalization of Chiller Layout

2. Impact of Wind Direction and Wind Speed on Chiller Capacity

3. Summary of Existing Heat Load Requirements

4. Existing and Reduced Capacity of Chillers due to Wind Direction and

Wind Speed

5. Revised Required Heat Loads due to TSPC

6. Chiller Capacity Evaluation with Revised Loads

7. Conclusion


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NW Wind Direction DeterminationEngineering Standard - SAES-A-112 31 October 2006 -- Saudi Aramco DeskTop Standards

Conclusion: WIND DIRECTION IS NW


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PLANT WIND DIRECTIONS ISSUE REVISED CHILLERS LAYOUT


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Nomenclature

25 24 23 22 21

15 14 13 12 11

Wind

LOOK SEE CFD MODEL - DRAFT


7/19

Scenarios Run

Wind from 45 degrees

Wind speeds (mph) of (Iteration Number in parenthesis): 10 (0 500)

15 (501-1000)

20 (1001-1500)

25 (1501 2000)

30 (2001 2500)

35 (2501-3000) 40 (3001-3500)

50 (3501-4000)

60 (4001-4500)

70 (4501-5000)


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Temperature MapTop View 20 mph


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Temperature MapTop View 70 mph


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Recirculation Temperature


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Quantitative SummaryAverage Inlet air Temperature increase (degree F)

Chiller

Wind

Speed

11 12 13 14 15 21 22 23 24 25

10 mph 17 14 14 14 9 14 19 16 14 11

15 mph 15 14.5 14.5 14.5 9.5 17 19 17 13 10.5

20 mph 15 12.5 12.5 12.5 11 20 20 18 11 11.5

25 mph 13 13.5 13.5 13.5 11 18 18 18 11 10

30 mph 13 13.7 13.7 13.7 11.5 18 18 18 12 10.5

35 mph 12 14.5 13.5 14 11 18.5 11 14.5 13 10.5

40 mph 11.5 14.5 13 13.7 11 18 10.5 11 12.5 10.5

50 mph 9 13.5 12 13 10.5 16.5 9 9 9 9.5

60 mph 8 12.5 9 12.5 9.5 13.5 8.5 9 7.5 9.5

70 mph 6 12 9 11.5 9.5 12.5 8 9 7 9


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Quantitative SummaryPercent of inlet air that comes from the outlet of a cooler

Chiller

Wind

Speed

11 12 13 14 15 21 22 23 24 25

10 mph 57 47 47 47 30 47 63 53 47 37

15 mph 50 48 48 48 32 57 63 57 43 35

20 mph 50 42 42 42 37 67 67 60 37 38

25 mph 43 45 45 45 37 60 60 60 37 33

30 mph 43 46 46 46 38 60 60 60 40 35

35 mph 40 48 45 47 37 62 37 48 43 35

40 mph 38 48 43 45 37 60 35 37 42 35

50 mph 30 45 40 43 35 55 30 30 30 32

60 mph 27 42 30 42 32 45 28 30 25 32

70 mph 20 40 30 38 32 42 27 30 23 30


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Reduced Chiller Capacity:

Based on the Preliminary CFD model the average temperature increase to the inlet ofchillers is 12.4 0F.

The chiller capacity of 408.1 Tons was based on ambient temperature of 107.6 0F.Considering the effect of NW wind the inlet temperature is estimated to be 107 +12.4 = 120 0F

Using the Performance data at various ambient temperatures provided by Zamil, thereduced capacity at 120 0F ambient temperature is 373.5 Tons

Total Capacity of 23 Chillers with NW Winds Impact = 373.5 x 23 = 8590.5 Tons

Original Total Capacity of 23 Chillers with NW Winds Impact = 9386 TonsReduction in Chillers Capacity Due to Wind Direction and Speed = 795.5 Tons

OR 8.48%

Total Plant Existing Loads = 8182 Tons

Margin Available in Existing System = 408.5 Tons OR 4.99%


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Margin Recovery and Evaluation

1. Doosan Loads Decreased Due to Reduction in Water Requirements from 1100 m3/hr to 1000m3/hr. The corresponding load based on 1000 m3/hr is 2906 Tons.Credit Due to Revised Water Flow Requirements = 3194 2906 = 288 Tons.

Revised Plant Heat Loads Required = 7,894 Tons

Margin Including UST (GT Workshops) = 696.5 Tons OR 8.82%

2. Credit From GT Workshops Load Removal: TSPC replaced GT Workshops with SmallOffices for which self contained DX Units will be installed without he use of Chilled Water.The existing required load for each UST building is 44.3 Tons. Removal of these buildings willresult in a reduction of 44.3 x 6 = 265.8 Tons.

The new revised loads without the UST buildings = 7,894-265.8 = 7,628.2 Tons

Margin Excluding the GT Workshops = 8,590.5 7,628.2 = 962.3 Tons OR 12.62%

Conclusion

The existing chilled water plant with 23 chillers in operation and 3 in standby and consideringthe impact of NW wind are adequate to provide the required chilled water to and Plant buildings.


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FACTORY TEST SET UP


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Attachment 2 Chiller Testing Facility

Attachment 2


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Attachment 2 Chiller Test Setup with Temp. Probes


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Attachment 2 Chiller Test Setup with Fan Blowing at Paper in Hand


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Engineer Monitoring the Test at Chiller Manufacturer

Wind Effect on Chiller

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