فرق درجات حرارة المياه الباردة و معضلة رفع الفرق Are you facing low cooling effect at your chilled water system? Are you experiencing low delta-T across Heat Exchanger? Are finding Air pockets at higher floors? Are you suffering from high relative humidity? Are you forced to use all your chilled water pumps? Are you paying more for less cooling effect? Did you try everything possible to claim back cooling without positive result? If your facing some or all the above? Solution starts from here

1. 1
‫معضلة‬‫الحرارة‬ ‫درجات‬ ‫فرق‬
Chilled- Water Delta Ts Dilemma
By Eng. Juma Yousef Juma
Delta-T Management Awareness Presentation
Green Earth Technology Co.

2. ‫عالية؟‬ ‫حرارة‬ ‫درجة‬ ‫بفرق‬ ‫نعنى‬ ‫ماذا‬
What is High Delta Temp.?
 Delta T (ΔT)= change in temperature
 “The ΔT”
- Facilities: across cooling unit coils
(Δ between supply and return)
 There are actually 4 ΔT’s

3. The 4ΔT’s: to ensure Efficiency, Performance & Comfort
1
2
3
4
4‫الحرارة‬ ‫لدرجات‬ ‫فروق‬:‫الراحة‬ ‫و‬ ‫والفعالية‬ ‫الكفاءة‬ ‫لضمان‬

4. 4
The 4 ΔT’s: to ensure Efficiency, Performance & Comfort
4‫الحرارة‬ ‫لدرجات‬ ‫فروق‬:‫الراحة‬ ‫و‬ ‫والفعالية‬ ‫الكفاءة‬ ‫لضمان‬
1. Primary ΔT to ensure
DC-Plant efficiency.
2. Secondary ΔT across
PHX to ensure full heat
transfer.
3. Chilled Water ΔT
Through cooling unit to
ensure performance.
4. Cold Air ΔT Through
cooling unit to ensure
comfort.
2.‫التبريد‬ ‫مياه‬ ‫حرارة‬ ‫درجة‬ ‫فرق‬
‫الحمل‬ ‫معالجة‬ ‫لضمان‬ ‫الثانوية‬
‫الحرارى‬.
1.‫التبريد‬ ‫مياه‬ ‫حرارة‬ ‫درجة‬ ‫فرق‬
‫مصنع‬ ‫كفاءة‬ ‫لضمان‬ ‫اإلبتدائية‬
‫التبريد‬.
3.‫ملف‬ ‫عبر‬ ‫الحرارة‬ ‫درجة‬ ‫فرق‬
‫األداء‬ ‫لضمان‬ ‫التبريد‬.
4.‫عبر‬ ‫الهواء‬ ‫حرارة‬ ‫درجة‬ ‫فرق‬
‫الراحة‬ ‫لضمان‬ ‫التبريد‬ ‫ملف‬.

5. 1. Primary ΔT to ensure
DC-Plant efficiency.
2. Secondary ΔT across
PHX to ensure full heat
transfer.
3. Chilled Water ΔT
Through cooling unit to
ensure performance.
4. Cold Air ΔT Through
cooling unit to ensure
comfort.
5
The 4 ΔT’s: to ensure Efficiency, Performance & Comfort
4‫الحرارة‬ ‫لدرجات‬ ‫فروق‬:‫الراحة‬ ‫و‬ ‫والفعالية‬ ‫الكفاءة‬ ‫لضمان‬
.1‫التبريد‬ ‫مياه‬ ‫حرارة‬ ‫درجة‬ ‫فرق‬
‫مصنع‬ ‫كفاءة‬ ‫لضمان‬ ‫اإلبتدائية‬
‫التبريد‬.
.2‫التبريد‬ ‫مياه‬ ‫حرارة‬ ‫درجة‬ ‫فرق‬
‫الحمل‬ ‫معالجة‬ ‫لضمان‬ ‫الثانوية‬
‫الحرارى‬.
.3‫ملف‬ ‫عبر‬ ‫الحرارة‬ ‫درجة‬ ‫فرق‬
‫األداء‬ ‫لضمان‬ ‫التبريد‬.
.4‫عبر‬ ‫الهواء‬ ‫حرارة‬ ‫درجة‬ ‫فرق‬
‫الراحة‬ ‫لضمان‬ ‫التبريد‬ ‫ملف‬.

6. 6
ΔT: through PHX Primary/Secondary Sides

7. 7
ΔT: through PHX Primary Side
ΔT

8. 8
ΔT: through PHX Secondary Side
ΔP

9. ΔT vs. ΔP: No Liner Relation
ΔP
ΔT

10. Primary Press. vs. Secondary Press.: Can’t be Equal
High Press.Low Press.
FAHU @ Roof
Sec.
Pumping:
Starting
Point
Primary Pumping
Ending Point

14. Typical Chilled Water System Layout
DT1DT2
Q1Q2
Q2.1
Q2.2
q2.1.1 q2.1.2
q2.2.1 q2.2.2
District
Cooling
1F
2F ES
ES
FCUFCU
FCUFCU
q2.n
FAHU

15. 15
ΔT: through cooling unit-Water Side
LWT
ΔT

16. ΔT: through cooling unit-Water Side
LWT

17. ΔT: through cooling unit-Water Side
LWT

18. 18
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

19. ‫جيتكو‬ ‫مع‬:‫ال‬‫تبريد‬‫هذه‬ ‫بعد‬ ‫مضمون‬‫التعديالت‬
With Getco Cooling is Guarantee After
these Corrections

21. Thank you! Looking forward to serve-U better
jumayjuma@gmail.com
https://www.facebook.com/greenearthtechnologycompany/
https://www.facebook.com/groups/780970768708352/
www.alsadarah.net
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-
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Eng. Juma Yousef Juma
CEO & Business DESelopment
Manager, Getco Green Earth
Technology Co.
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