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‫معضلة‬‫الحرارة‬ ‫درجات‬ ‫فرق‬
Chilled- Water Delta Ts Dilemma
By Eng. Juma Yousef Juma
Q&A Why Delta-T Primary Side is Straight 16’F, while
Secondary is Low and beyond control
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
‫حال‬ ‫هو‬ ‫كيف‬‫فرق‬‫حرارة‬ ‫درجة‬‫المبادل‬ ‫طرفي‬ ‫على‬‫؟‬
How’s CHW Delta-T across the PHX?
5’C-41’F
13’C-56’F
6’C-43’F
14’C-58’F
Primary Secondary
Daily Average
of ΔT @
Secondary
ΔT @ Primary
Actual Readings bet. Primacy vs. Secondary Summer Month
While Delta-T in Primary is 7.9’C Found Delta-T in Secondary is 1.1’C
Actual Readings bet. Primacy vs. Secondary Summer Month
Why?
Why Delta-T
Primary Side is
Straight 16’F,
while Secondary
is Low and
beyond control?
‫لماذا؟‬
‫درجة‬ ‫لفرق‬ ‫يمكن‬ ‫لماذا‬
‫الدائرة‬ ‫في‬ ‫الحرارة‬
‫خطا‬ ‫يكون‬ ‫أن‬ ‫االبتدائية‬
‫على‬ ‫مستقيما‬16‫درجة‬
‫فهرنهايتية‬,‫ي‬ ‫ال‬ ‫بينما‬‫مكننا‬
‫في‬ ‫الفرق‬ ‫بهذا‬ ‫التحكم‬
‫الثانية؟‬ ‫الدائرة‬
3 Main Reasons for the Different
in Delta-T across the PHX
While One Load is
connected to Primary
Circuit, there are Hundreds
of Air Handling Units
connected to Secondary.
While precious CV
controlling Primary side
from the PHX, no central CV
installed on Secondary side.
While Pressure at Primary
side from the PHX is Low
(End Circuit), Pressure in
Secondary side is very High
(Begging of Circuit that
required to Pump high rise).
3‫ال‬ ‫في‬ ‫االختالف‬ ‫تسبب‬ ‫رئيسية‬ ‫أسباب‬‫بين‬ ‫فرق‬
‫الحرارى‬ ‫المبادل‬ ‫عبر‬ ‫الحرارة‬ ‫درجات‬
‫ف‬ ‫واحد‬ ‫حرارة‬ ‫مصدر‬ ‫يرتبط‬ ‫بينما‬‫ي‬
‫االبتدائية‬ ‫الدائرة‬,‫هناك‬ ‫أن‬ ‫نرى‬
‫ومن‬ ‫الهواء‬ ‫دفع‬ ‫وحدات‬ ‫من‬ ‫المئات‬
‫الث‬ ‫بالدائرة‬ ‫مرتبطة‬ ‫األحجام‬ ‫كل‬‫انية‬.
‫للتحك‬ ‫رئيسي‬ ‫صمام‬ ‫يوجد‬ ‫بينما‬‫م‬
‫الدائ‬ ‫ناحية‬ ‫الباردة‬ ‫المياه‬ ‫بتدفق‬‫رة‬
‫االبتدائية‬,‫ن‬ ‫من‬ ‫تحكم‬ ‫أي‬ ‫يوجد‬ ‫ال‬‫احية‬
‫الثانية‬ ‫الدائرة‬.
‫الدائرة‬ ‫في‬ ‫الضغط‬ ‫يكون‬ ‫بينما‬
‫منخفض‬ ‫االبتدائية‬(‫الدائ‬ ‫نهاية‬‫رة‬)
‫الثاني‬ ‫الدائرة‬ ‫في‬ ‫الضغط‬ ‫يكون‬‫عال‬ ‫ة‬
‫جدا‬(‫الم‬ ‫لضخ‬ ‫تسعي‬ ‫دائرة‬ ‫بداية‬‫اء‬
‫كبيرة‬ ‫ارتفاعات‬ ‫في‬)
While precious CV controlling
Primary side from the PHX,
no central CV installed on
Secondary side.
‫ب‬ ‫للتحكم‬ ‫رئيسي‬ ‫صمام‬ ‫يوجد‬ ‫بينما‬‫تدفق‬
‫االبتدائ‬ ‫الدائرة‬ ‫ناحية‬ ‫الباردة‬ ‫المياه‬‫ية‬,‫ال‬
‫الثا‬ ‫الدائرة‬ ‫ناحية‬ ‫من‬ ‫تحكم‬ ‫أي‬ ‫يوجد‬‫نية‬.
M
‫الدائرة‬
‫االبتدائي‬‫ة‬
CHW
Primary
Circuit
‫الدائرة‬‫الثانية‬
CHW Secondary Circuit
While
One
Load is
connected
to
Primary
Circuit.
There are Hundreds
of Air Handling Units
connected to
Secondary.
There are Hundreds
of Air Handling Units
connected to
Secondary.
There are Hundreds
of Air Handling Units
connected to
Secondary.
Primary Press. vs. Secondary Press.: Can’t be Equal
High Press.Low Press.
FAHU @
Roof
Sec.
Pumping
: Starting
Point
Primary Pumping
Ending Point
‫معنا‬:‫ال‬‫تبريد‬‫هذه‬ ‫بعد‬ ‫مضمون‬‫التعديالت‬
With us: Cooling is Guarantee After these
Corrections
Thank you! Looking forward to serve-U better
jumayjuma@gmail.com
https://www.facebook.com/greenearthtechnologycompany/
https://www.facebook.com/groups/780970768708352/
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. &
Delta Solutions Co.
Follow us for the latest news and information
on Solutions of HVAC Challenges.

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Delta t dilemma of chw q&a why delta t primary side is straight 16 f while secondary is low

  • 1. 1 ‫معضلة‬‫الحرارة‬ ‫درجات‬ ‫فرق‬ Chilled- Water Delta Ts Dilemma By Eng. Juma Yousef Juma Q&A Why Delta-T Primary Side is Straight 16’F, while Secondary is Low and beyond control 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. ‫حال‬ ‫هو‬ ‫كيف‬‫فرق‬‫حرارة‬ ‫درجة‬‫المبادل‬ ‫طرفي‬ ‫على‬‫؟‬ How’s CHW Delta-T across the PHX? 5’C-41’F 13’C-56’F 6’C-43’F 14’C-58’F Primary Secondary
  • 6. Daily Average of ΔT @ Secondary ΔT @ Primary Actual Readings bet. Primacy vs. Secondary Summer Month
  • 7. While Delta-T in Primary is 7.9’C Found Delta-T in Secondary is 1.1’C Actual Readings bet. Primacy vs. Secondary Summer Month
  • 8. Why? Why Delta-T Primary Side is Straight 16’F, while Secondary is Low and beyond control? ‫لماذا؟‬ ‫درجة‬ ‫لفرق‬ ‫يمكن‬ ‫لماذا‬ ‫الدائرة‬ ‫في‬ ‫الحرارة‬ ‫خطا‬ ‫يكون‬ ‫أن‬ ‫االبتدائية‬ ‫على‬ ‫مستقيما‬16‫درجة‬ ‫فهرنهايتية‬,‫ي‬ ‫ال‬ ‫بينما‬‫مكننا‬ ‫في‬ ‫الفرق‬ ‫بهذا‬ ‫التحكم‬ ‫الثانية؟‬ ‫الدائرة‬
  • 9. 3 Main Reasons for the Different in Delta-T across the PHX While One Load is connected to Primary Circuit, there are Hundreds of Air Handling Units connected to Secondary. While precious CV controlling Primary side from the PHX, no central CV installed on Secondary side. While Pressure at Primary side from the PHX is Low (End Circuit), Pressure in Secondary side is very High (Begging of Circuit that required to Pump high rise). 3‫ال‬ ‫في‬ ‫االختالف‬ ‫تسبب‬ ‫رئيسية‬ ‫أسباب‬‫بين‬ ‫فرق‬ ‫الحرارى‬ ‫المبادل‬ ‫عبر‬ ‫الحرارة‬ ‫درجات‬ ‫ف‬ ‫واحد‬ ‫حرارة‬ ‫مصدر‬ ‫يرتبط‬ ‫بينما‬‫ي‬ ‫االبتدائية‬ ‫الدائرة‬,‫هناك‬ ‫أن‬ ‫نرى‬ ‫ومن‬ ‫الهواء‬ ‫دفع‬ ‫وحدات‬ ‫من‬ ‫المئات‬ ‫الث‬ ‫بالدائرة‬ ‫مرتبطة‬ ‫األحجام‬ ‫كل‬‫انية‬. ‫للتحك‬ ‫رئيسي‬ ‫صمام‬ ‫يوجد‬ ‫بينما‬‫م‬ ‫الدائ‬ ‫ناحية‬ ‫الباردة‬ ‫المياه‬ ‫بتدفق‬‫رة‬ ‫االبتدائية‬,‫ن‬ ‫من‬ ‫تحكم‬ ‫أي‬ ‫يوجد‬ ‫ال‬‫احية‬ ‫الثانية‬ ‫الدائرة‬. ‫الدائرة‬ ‫في‬ ‫الضغط‬ ‫يكون‬ ‫بينما‬ ‫منخفض‬ ‫االبتدائية‬(‫الدائ‬ ‫نهاية‬‫رة‬) ‫الثاني‬ ‫الدائرة‬ ‫في‬ ‫الضغط‬ ‫يكون‬‫عال‬ ‫ة‬ ‫جدا‬(‫الم‬ ‫لضخ‬ ‫تسعي‬ ‫دائرة‬ ‫بداية‬‫اء‬ ‫كبيرة‬ ‫ارتفاعات‬ ‫في‬)
  • 10. While precious CV controlling Primary side from the PHX, no central CV installed on Secondary side. ‫ب‬ ‫للتحكم‬ ‫رئيسي‬ ‫صمام‬ ‫يوجد‬ ‫بينما‬‫تدفق‬ ‫االبتدائ‬ ‫الدائرة‬ ‫ناحية‬ ‫الباردة‬ ‫المياه‬‫ية‬,‫ال‬ ‫الثا‬ ‫الدائرة‬ ‫ناحية‬ ‫من‬ ‫تحكم‬ ‫أي‬ ‫يوجد‬‫نية‬.
  • 11. M ‫الدائرة‬ ‫االبتدائي‬‫ة‬ CHW Primary Circuit ‫الدائرة‬‫الثانية‬ CHW Secondary Circuit While One Load is connected to Primary Circuit. There are Hundreds of Air Handling Units connected to Secondary. There are Hundreds of Air Handling Units connected to Secondary. There are Hundreds of Air Handling Units connected to Secondary.
  • 12. Primary Press. vs. Secondary Press.: Can’t be Equal High Press.Low Press. FAHU @ Roof Sec. Pumping : Starting Point Primary Pumping Ending Point
  • 14. Thank you! Looking forward to serve-U better jumayjuma@gmail.com https://www.facebook.com/greenearthtechnologycompany/ https://www.facebook.com/groups/780970768708352/ 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. & Delta Solutions Co. Follow us for the latest news and information on Solutions of HVAC Challenges.