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‫معضلة‬‫الحرارة‬ ‫درجات‬ ‫فرق‬
Chilled- Water Delta Ts Dilemma
By Eng. Juma Yousef Juma
Q&A What is the effect of Low Delta-T on Efficiency & Comfort
Green Earth Technology Co. & Delta Solutions Co.
‫للتأسيس‬ ‫مقدمة‬–Introduction to Basics
Load AHU FCU FAHU
Cooling Tower
DELTA T (ΔT)
3
‫عالية؟‬ ‫حرارة‬ ‫درجة‬ ‫بفرق‬ ‫نعنى‬ ‫ماذا‬
WHAT IS HIGH DELTA TEMP.?
‫عالية؟‬ ‫حرارة‬ ‫درجة‬ ‫بفرق‬ ‫نعنى‬ ‫ماذا‬
What is High Delta Temp.?
5’C-41’F
13’C-56’F
‫لم‬ ‫يحدث‬ ‫ماذا‬‫الباردة‬ ‫المياه‬ ‫منظومة‬ ‫كونات‬‫عند‬‫إختالف‬‫المياه‬ ‫حرارة‬ ‫درجة‬ ‫فرق‬
‫الباردة‬‫التبريد‬ ‫أجهزة‬ ‫عبر‬‫؟‬
What will happen to CH. W. Sys. Components
when Delta Temp. Differ (Keep Changing)?
‫الشيلرات‬Chillers
‫المضخات‬Pumps
‫أبراج‬
Cooling
‫عدادات‬Energy
‫الطاقة‬Meters
‫رضي‬Occupants
‫المستخدمين‬Satisfaction
‫التبريد‬Towers
‫التأثير‬Enviro.
‫ال‬‫بيئي‬Effect
1000
gpm/
Pump
1‫و‬ ‫شيلر‬1‫لتولد‬ ‫تعمل‬ ‫مضخة‬600‫تبريد‬ ‫طن‬@15-‫فرق‬ ‫فهرنهايتية‬ ‫درجة‬
1-Chiller & 1-Pump is Working to Deliver 600 TR @ DT.: 15’F
600- TR/Chiller
5.5’C
42’F
4.5’C
40’F
14.5’C
58’F
13.5’C
56’F
‫حالة‬ ‫فى‬‫ثبات‬‫الحرارة‬ ‫درجة‬:‫يمكن‬ ‫طن‬ ‫كم‬‫نقله‬‫عند‬
‫المياه؟‬ ‫تدفق‬ ‫كمية‬ ‫تغيير‬
When Delta Temp. is fixed, how many TR can
be transfer when flow change?
gpm Delta-T TR
500 4 83.3
600 4 100
700 4 117
800 4 133
900 4 150
1000 4 167
1400 4 233
1100 4 183
1200 4 200
1500 4 250
1800 4 300
2000 4 333
2500 4 417
3000 4 500
4000 4 667
4‫و‬ ‫شيلرات‬4‫لتولد‬ ‫تعمل‬ ‫مضخات‬600‫تبريد‬ ‫طن‬@4-‫فرق‬ ‫فهرنهايتية‬ ‫درجات‬
5-Chillers & 5-Pumps are Working to Deliver 600 TR @ DT: 4’F
4000-
gpm
Pump
600- TR/Chiller
12.2
’C
54’F
4.5
’C
40’
F
14.5
’C
58’F
6.7
’C
44’
F
DC-District Cooling Plant . ‫تبريدالمياه‬ ‫محطة‬
3’F
6’F
9’F
12’
F
16’
F
‫بناية‬ ‫فى‬ ‫تبريده‬ ‫المطلوب‬ ‫الحرارى‬ ‫الحمل‬ ‫كان‬ ‫إذا‬(600‫طن‬)‫سيعمل؟‬ ‫شيلر‬ ‫فكم‬
If we have a Building Load 600 TR: How many Chiller we will Work?
5000
gpm
4000
gpm
3000
gpm
2000
gpm
1000
gpm
Chiller
Cap. 600
TR/each
‫فعال‬ ‫غير‬ ‫تشغيل‬
Inefficient Operation
‫بناية‬ ‫فى‬ ‫تبريده‬ ‫المطلوب‬ ‫الحرارى‬ ‫الحمل‬ ‫كان‬ ‫إذا‬(600‫طن‬)‫سيعمل؟‬ ‫شيلر‬ ‫فكم‬
If we have a Building Load 600 TR: How many Chiller we will Work?
‫فعال‬ ‫تشغيل‬ ‫خيار‬
Optimum Operation
13’C
56’
F
4.5’
C
40’
F
6.7’
C
44’
F
4.5’
C
40’
F
Energy Wastage at
CHW Plant
&
System Dis-Efficiency
‫هدر‬‫في‬ ‫للطاقة‬
‫التبر‬ ‫توليد‬ ‫محطة‬‫يد‬
‫و‬
‫كفؤة‬ ‫غير‬ ‫المنظومة‬
‫النتيجة‬1--Conclusion
13
ΔT: through cooling unit-Air Side
Control
Signal:
0-10 V DC
Flow: 1.5 gpm/TR
Pressure: 3 Bar
EWT: 6’C
LWT: 14’C
DT: 8’C
Temp.: 12.7’C
RH%:94.6%
DB: 12.2’C
W.: 8.6 g/kg
Dp: 11.9’C
Return
Air
Temp.: 23’C
RH%:55%
WB: 16.9’C
W.: 9.6 g/kg
Dp: 13.5’C
‫مكيف‬ ‫حالة‬ ‫فى‬16‫فرق‬ ‫على‬ ‫يعمل‬ ‫طن‬16‫فهرنهايتية‬ ‫درجة‬
In case of 16 TR AHU working at Delta-T: 16’F
How the AHU will perform at lower
Delta-T?
‫الف‬ ‫إنخفاض‬ ‫عند‬ ‫المكيف‬ ‫أداء‬ ‫سيكون‬ ‫كيف‬‫رق؟‬ TR
DELTA-
T
GP
M
16 16 24
15 15 24
14 14 24
13 13 24
12 12 24
11 11 24
10 10 24
9 9 24
8 8 24
7 7 24
6 6 24
5 5 24
4 4 24
3 3 24
2 2 24
1 1 24
0 0 24
Indoor Unit can’t reach
desire level
&
System Dis-Comfort
‫يص‬ ‫ال‬ ‫الجهاز‬ ‫تبريد‬‫ل‬
‫المنش‬ ‫المستوى‬ ‫إلى‬‫ود‬
‫و‬
‫مريحة‬ ‫غير‬ ‫المنظومة‬
‫النتيجة‬--2Conclusion
RA: 25°C
50%RH
14°C Start Dehumidification
‫الراح‬ ‫لتحقيق‬ ‫المثالية‬ ‫التبريد‬ ‫دورة‬‫ة‬
Ref. Cycle for Comfort
Design Condition - ‫التصميم‬
More Dehumidification @ 11°C
Water Content: 10 Gr/Kg.Air
Cooling
SA: 11°
DB/WB
‫درجة‬ ‫تكون‬ ‫أن‬ ‫بشرط‬
‫التبريد‬ ‫مياه‬ ‫حرارة‬
In condition of
EWT <8’C
RA: 25°C
50%RH
19°C Start Dehumidification
‫الراح‬ ‫لتحقيق‬ ‫المثالية‬ ‫التبريد‬ ‫دورة‬‫ة‬
Ref. Cycle for Comfort
Design Condition - ‫التصميم‬
More Dehumidification @ 16°C
Water Content: 14 Gr/Kg.Air
CoolingSA: 16°
DB/WB
‫درجة‬ ‫تكون‬ ‫أن‬ ‫بشرط‬
‫التبريد‬ ‫مياه‬ ‫حرارة‬
In condition of
EWT >8’C
‫الراحة‬ ‫تحقيق‬ ‫في‬ ‫الرطوبة‬ ‫مستوى‬ ‫دور‬
Role of RH% on Comfort
10
G/KG
14
G/KG
RA: 25°C
50%RH
RA: 25°C
65%RH
RA: 45°C
30%RH
18.2
G/KG
Indoor Unit can’t
dehumidify Vapor
& System Dis-Comfort
because of High
Relative Humidity Level
‫يقوم‬ ‫ال‬ ‫الجهاز‬ ‫تبريد‬
‫الرطوبة‬ ‫بتكثيف‬
‫والمنظومة‬‫مريحة‬ ‫غير‬
‫الرطوبة‬ ‫مستوى‬ ‫ألن‬
‫مرتفع‬ ‫النسبية‬
‫النتيجة‬--3Conclusion
Q&amp;a what is the effect of low CHW delta t on efficiency &amp; comfort - by getco
Thank you! Looking forward to serve-U better
jumayjuma@gmail.com
https://www.facebook.com/greenearthtechnologycompany/
https://www.facebook.com/groups/780970768708352/
https://www.facebook.com/Getco-Green-Earth-Technology-Co-
100548935005813/?modal=admin_todo_tour
https://www.linkedin.com/in/juma-yousef-j-saleh-%D8%AC%D9%85%D8%B9%D8%A9-
%D9%8A%D9%88%D8%B3%D9%81-%D8%AC%D9%85%D8%B9%D8%A9-
%D8%B5%D8%A7%D9%84%D8%AD-9941b049/
Eng. Juma Yousef Juma
CEO & Business DESelopment
Manager, Getco Green Earth
Technology Co. and
Follow us for the latest news and information
on Solutions of HVAC Challenges.

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Q&amp;a what is the effect of low CHW delta t on efficiency &amp; comfort - by getco

  • 1. 1 ‫معضلة‬‫الحرارة‬ ‫درجات‬ ‫فرق‬ Chilled- Water Delta Ts Dilemma By Eng. Juma Yousef Juma Q&A What is the effect of Low Delta-T on Efficiency & Comfort Green Earth Technology Co. & Delta Solutions Co.
  • 2. ‫للتأسيس‬ ‫مقدمة‬–Introduction to Basics Load AHU FCU FAHU Cooling Tower
  • 3. DELTA T (ΔT) 3 ‫عالية؟‬ ‫حرارة‬ ‫درجة‬ ‫بفرق‬ ‫نعنى‬ ‫ماذا‬ WHAT IS HIGH DELTA TEMP.?
  • 4. ‫عالية؟‬ ‫حرارة‬ ‫درجة‬ ‫بفرق‬ ‫نعنى‬ ‫ماذا‬ What is High Delta Temp.? 5’C-41’F 13’C-56’F
  • 5. ‫لم‬ ‫يحدث‬ ‫ماذا‬‫الباردة‬ ‫المياه‬ ‫منظومة‬ ‫كونات‬‫عند‬‫إختالف‬‫المياه‬ ‫حرارة‬ ‫درجة‬ ‫فرق‬ ‫الباردة‬‫التبريد‬ ‫أجهزة‬ ‫عبر‬‫؟‬ What will happen to CH. W. Sys. Components when Delta Temp. Differ (Keep Changing)? ‫الشيلرات‬Chillers ‫المضخات‬Pumps ‫أبراج‬ Cooling ‫عدادات‬Energy ‫الطاقة‬Meters ‫رضي‬Occupants ‫المستخدمين‬Satisfaction ‫التبريد‬Towers ‫التأثير‬Enviro. ‫ال‬‫بيئي‬Effect
  • 6. 1000 gpm/ Pump 1‫و‬ ‫شيلر‬1‫لتولد‬ ‫تعمل‬ ‫مضخة‬600‫تبريد‬ ‫طن‬@15-‫فرق‬ ‫فهرنهايتية‬ ‫درجة‬ 1-Chiller & 1-Pump is Working to Deliver 600 TR @ DT.: 15’F 600- TR/Chiller 5.5’C 42’F 4.5’C 40’F 14.5’C 58’F 13.5’C 56’F
  • 7. ‫حالة‬ ‫فى‬‫ثبات‬‫الحرارة‬ ‫درجة‬:‫يمكن‬ ‫طن‬ ‫كم‬‫نقله‬‫عند‬ ‫المياه؟‬ ‫تدفق‬ ‫كمية‬ ‫تغيير‬ When Delta Temp. is fixed, how many TR can be transfer when flow change? gpm Delta-T TR 500 4 83.3 600 4 100 700 4 117 800 4 133 900 4 150 1000 4 167 1400 4 233 1100 4 183 1200 4 200 1500 4 250 1800 4 300 2000 4 333 2500 4 417 3000 4 500 4000 4 667
  • 8. 4‫و‬ ‫شيلرات‬4‫لتولد‬ ‫تعمل‬ ‫مضخات‬600‫تبريد‬ ‫طن‬@4-‫فرق‬ ‫فهرنهايتية‬ ‫درجات‬ 5-Chillers & 5-Pumps are Working to Deliver 600 TR @ DT: 4’F 4000- gpm Pump 600- TR/Chiller 12.2 ’C 54’F 4.5 ’C 40’ F 14.5 ’C 58’F 6.7 ’C 44’ F
  • 9. DC-District Cooling Plant . ‫تبريدالمياه‬ ‫محطة‬
  • 10. 3’F 6’F 9’F 12’ F 16’ F ‫بناية‬ ‫فى‬ ‫تبريده‬ ‫المطلوب‬ ‫الحرارى‬ ‫الحمل‬ ‫كان‬ ‫إذا‬(600‫طن‬)‫سيعمل؟‬ ‫شيلر‬ ‫فكم‬ If we have a Building Load 600 TR: How many Chiller we will Work? 5000 gpm 4000 gpm 3000 gpm 2000 gpm 1000 gpm Chiller Cap. 600 TR/each
  • 11. ‫فعال‬ ‫غير‬ ‫تشغيل‬ Inefficient Operation ‫بناية‬ ‫فى‬ ‫تبريده‬ ‫المطلوب‬ ‫الحرارى‬ ‫الحمل‬ ‫كان‬ ‫إذا‬(600‫طن‬)‫سيعمل؟‬ ‫شيلر‬ ‫فكم‬ If we have a Building Load 600 TR: How many Chiller we will Work? ‫فعال‬ ‫تشغيل‬ ‫خيار‬ Optimum Operation 13’C 56’ F 4.5’ C 40’ F 6.7’ C 44’ F 4.5’ C 40’ F
  • 12. Energy Wastage at CHW Plant & System Dis-Efficiency ‫هدر‬‫في‬ ‫للطاقة‬ ‫التبر‬ ‫توليد‬ ‫محطة‬‫يد‬ ‫و‬ ‫كفؤة‬ ‫غير‬ ‫المنظومة‬ ‫النتيجة‬1--Conclusion
  • 13. 13 ΔT: through cooling unit-Air Side Control Signal: 0-10 V DC Flow: 1.5 gpm/TR Pressure: 3 Bar EWT: 6’C LWT: 14’C DT: 8’C Temp.: 12.7’C RH%:94.6% DB: 12.2’C W.: 8.6 g/kg Dp: 11.9’C Return Air Temp.: 23’C RH%:55% WB: 16.9’C W.: 9.6 g/kg Dp: 13.5’C
  • 14. ‫مكيف‬ ‫حالة‬ ‫فى‬16‫فرق‬ ‫على‬ ‫يعمل‬ ‫طن‬16‫فهرنهايتية‬ ‫درجة‬ In case of 16 TR AHU working at Delta-T: 16’F How the AHU will perform at lower Delta-T? ‫الف‬ ‫إنخفاض‬ ‫عند‬ ‫المكيف‬ ‫أداء‬ ‫سيكون‬ ‫كيف‬‫رق؟‬ TR DELTA- T GP M 16 16 24 15 15 24 14 14 24 13 13 24 12 12 24 11 11 24 10 10 24 9 9 24 8 8 24 7 7 24 6 6 24 5 5 24 4 4 24 3 3 24 2 2 24 1 1 24 0 0 24
  • 15. Indoor Unit can’t reach desire level & System Dis-Comfort ‫يص‬ ‫ال‬ ‫الجهاز‬ ‫تبريد‬‫ل‬ ‫المنش‬ ‫المستوى‬ ‫إلى‬‫ود‬ ‫و‬ ‫مريحة‬ ‫غير‬ ‫المنظومة‬ ‫النتيجة‬--2Conclusion
  • 16. RA: 25°C 50%RH 14°C Start Dehumidification ‫الراح‬ ‫لتحقيق‬ ‫المثالية‬ ‫التبريد‬ ‫دورة‬‫ة‬ Ref. Cycle for Comfort Design Condition - ‫التصميم‬ More Dehumidification @ 11°C Water Content: 10 Gr/Kg.Air Cooling SA: 11° DB/WB ‫درجة‬ ‫تكون‬ ‫أن‬ ‫بشرط‬ ‫التبريد‬ ‫مياه‬ ‫حرارة‬ In condition of EWT <8’C
  • 17. RA: 25°C 50%RH 19°C Start Dehumidification ‫الراح‬ ‫لتحقيق‬ ‫المثالية‬ ‫التبريد‬ ‫دورة‬‫ة‬ Ref. Cycle for Comfort Design Condition - ‫التصميم‬ More Dehumidification @ 16°C Water Content: 14 Gr/Kg.Air CoolingSA: 16° DB/WB ‫درجة‬ ‫تكون‬ ‫أن‬ ‫بشرط‬ ‫التبريد‬ ‫مياه‬ ‫حرارة‬ In condition of EWT >8’C
  • 18. ‫الراحة‬ ‫تحقيق‬ ‫في‬ ‫الرطوبة‬ ‫مستوى‬ ‫دور‬ Role of RH% on Comfort 10 G/KG 14 G/KG RA: 25°C 50%RH RA: 25°C 65%RH RA: 45°C 30%RH 18.2 G/KG
  • 19. Indoor Unit can’t dehumidify Vapor & System Dis-Comfort because of High Relative Humidity Level ‫يقوم‬ ‫ال‬ ‫الجهاز‬ ‫تبريد‬ ‫الرطوبة‬ ‫بتكثيف‬ ‫والمنظومة‬‫مريحة‬ ‫غير‬ ‫الرطوبة‬ ‫مستوى‬ ‫ألن‬ ‫مرتفع‬ ‫النسبية‬ ‫النتيجة‬--3Conclusion
  • 21. Thank you! Looking forward to serve-U better jumayjuma@gmail.com https://www.facebook.com/greenearthtechnologycompany/ https://www.facebook.com/groups/780970768708352/ https://www.facebook.com/Getco-Green-Earth-Technology-Co- 100548935005813/?modal=admin_todo_tour https://www.linkedin.com/in/juma-yousef-j-saleh-%D8%AC%D9%85%D8%B9%D8%A9- %D9%8A%D9%88%D8%B3%D9%81-%D8%AC%D9%85%D8%B9%D8%A9- %D8%B5%D8%A7%D9%84%D8%AD-9941b049/ Eng. Juma Yousef Juma CEO & Business DESelopment Manager, Getco Green Earth Technology Co. and Follow us for the latest news and information on Solutions of HVAC Challenges.