Control variable chilled water pumping with maximum optimization to produce effective comfort cooling

1. Cooling
Performance
Evaluation of Design Compare to
Actual Performance
along with before & after

2. Accommodation from Two blocks
Each from Three Floors
Each Floor Cooled by: 3 FCU & 1 FAHU
S
K
M
S
K
M
F
A
S
K
M
S
K
M
S
K
M
F
A
S
K
M

3. Rooms Connected Unit No. F1
S
K
M

4. Riser Diagram
One ETS Room
One Pump RM
Two Risers
One for each
Block

5. Design: ETS RM Consist of 2-PHX
Actual: No PHX-CH. W. Direct Connected

6. Total Water Flow: 248.2 gpm (As Per Schedule)
Total Water Flow: 165.5 gpm (As Per Drawing)

7. Temperature Air Flow Water Flow
Observatio
n

8. 27-29’C
85 cfm
0.52 cfm/ft2
Water flow is LOW
Observatio
n

9. Site Inspection

10. & After Cleaning

11. Typical Room Size: 163 ft2
Design
Condition
180 cfm
4.74 TMBH
0.4 TR

12. Using Manometer we found
that ESP is Very Low,
because FAN is not selected
for High Static.
ESP: External
Static Pressure
Drop that ensure
the ability to blow
air out through long
duct

13. Total Water Flow: 165.5 gpm
(110 TR-As Per Drawing)
Reading-2 Reading-1
23040 l/h
= 84.5 gpm =49.1 TR-
45% of Total Load
12120 l/h
= 44.4 gpm =26.8 TR
24% of Total Load

14. Selection
of Indoor
Units
Reasons
Less
Water
Flow
Loose
Control
Ducting &
Air
Distribution

15. ‫حقيقي‬ ‫تكامل‬ ‫يوجد‬ ‫ال‬
‫المختلفة‬ ‫الخدمات‬ ‫بين‬
Main
Reason
No Real
Integration
between Services

16. Typical Room Size: 163 ft2
Design Actual Best Practice
85 cfm180 cfm 336 cfm

17. Air Flow:
Actual vs. Best Practice
Design Actual Best Practice
85 cfm180 cfm 336 cfm
4.74 TMBH
0.4 TR
2.55 TMBH
0.21 TR
10.1 TMBH
0.84 TR

18. Variable vs. Constant Flow
2-Way Valve 3-Way Valve
Variable Flow Constant Flow

19. Variable vs. Constant Flow
2-Way Valve 3-Way Valve
Variable Flow-Open/Close Constant Flow

20. Variable vs. Constant Flow
2-Way Valve Modulating CV
Open/Close Type Variable Flow

21. Variable vs. Constant Flow
Variable Flow Constant Flow
Variable Frequency Drive Direct Pump

22. Chilled Water System
Central Controller – Main Manu

23. FCV-Flow Control Valves 1&2-Are Total Open 31%,
While Accommodation is suffering from NO COOLING
FCV-1
60%
Open
FCV-2
2%
Open

24. Remedies ,
Solutions &
Improvemen
ts

25. First we have to
Understand how
DC Plant
Maintaining CH.
W. Delta-T and
evaluate A/C
Sys.
Components,
also the Logic of
HVAC
Controller.”
25

26. What Does Implementation Look Like?

27. cfm
Minimum
Standard:
2 cfm Per
ft2
Design
Enlarge
Unit
180 cfm

28. Since available CH. W. Pipe: 1”
Maximum Customize AHU: 2400 cfm, 11% better
than existing 2166 cfm
Design Best Practice Best Possible
336 cfm180 cfm 200 cfm

29. Since available CH. W. Pipe: 1”
Maximum Customize AHU can deliver: 60.1
TMBH of Cooling, 5.6% better than 56.9 TMBH
Design Best Practice Best Possible
336 cfm180 cfm 200 cfm
4.74 TMBH
0.4 TR
10.1 TMBH
0.84 TR
0.5 TMBH
0.60 TR

30. ecoCool AHU equipped with
two Blowers powered by
Stronger Motors driven by
adjustable Belts.
Increase ESP by Empower FAN
Motors

31. The New AHU from
ecoCool is
Dynamically Balanced
Unit that over come
both main reasons of
less cooling:
• Less Chilled Water Flow.
• More Air Flow

32. Total Water Flow: 165.5 gpm
(110 TR-As Per Drawing)
Reading-1
12120 l/h
= 44.4 gpm =26.8 TR
24% of Total Load
Reading-3
23040 l/h
= 148 gpm =89.9 TR-
90% of Total Load

33. By shifting Unit to corridor in order
to reduce duct and the negative
effect on Air Flow.
Duct
ecoCool

34. 1) Connect VFD.
2) Add new control
to signal VFD.
3) Utilize PICV
benefits
4) Shift the Make-
up Pressurization
Pump.
Convert to Dynamically Control Ch.
W. Sys.

35. 1d
Now VFD are disconnected and
Pumps are connected directly

36. 1d
Connect & Re-commission VFD to
Control Variable CH. W. Flow

37. VFD Activated for
Chilled Water
Pumps

38. Now VFD Vary the
Chilled Water
according to actual
demand

39. 2d
Exist signal to VFD from ETS* Reducing CH. W.
Flow inside the
Building while
trying to Maintain
Delta-T .
* Casing less
cooling effect.
* Reducing
emiCool BTU-
Meter-Bill.

40. 2d
Add new control to signal
VFD.
* Right Control
Method.
* With Right
Signal.
* At Right
Location.

41. 14
5.5
Shift Signal from before Load/BLD to
after ensuring filling all indoor units
ETS
Room

42. Correct Signal
Location to Control
VFD

43. After Correct Signal
and Activate VFD,
water is flowing
better and Cooling
Improved in Air
Temperature

44. 3d
Now CV-Open and Close Valve that
Flod the Cooling Coil with more
chilled water

45. 3d
benefits

46. 4d
Make-up Pressurization Pump @ GF
Pressurization Make-
up Pump located at
GF-Pumps Room and
can’t function as per
design.

47. 4d
Shift the Make-up Pressurization
Pump
Must shift the
Make-up
Pressurization
Pump to maintain
the minimum
pressure at the
weakest point.Shifted
to the
Roof

48. 14
5.5
Pressurization Pump is down: Not
Functioning: Must Shift to Weakest Point

49. 14
5.5
Control Signal:
Must ensure the
right flow @
weakest pointEV

50. Static Pressure is Monitored and
Maintained at Fixed Level
Fixed
Static
Pressure

51. Dynamic Pressure is Monitored and
Maintained at Fixed Level
Self
Balancing
Dynamic
Pressure

52. Our Solution is Molded in One Unit
CoolDynamically Balanced Solution

53. Replaced all the
24 AHUs with
ecoCool
Activate Variable
Pumps
Fix the Right
Flow Signal
Replace 6
FAHUs
‫الخطوة‬
‫التالية‬
Shift Press.
Pump to
weakest point

54. ETS Control System
is maintaining
around
6.2’C
all the time
Reading:
09/5/2015
Reading:
21/3/2015

55. But Chilled Water
Flow in
Ltr/Hour (l/h)
has been increased
by: 330%
after correction
Reading:
09/5/2015
Reading:
21/3/2015

56. Most important that
Cooling Capacity in
KWc
delivered the
building
has been increased
by: 260%
Reading:
12/5/2015
Reading:
21/3/2015

57. Supply Air Temp.
SAT

58. Room Temp.
RMT

59. Corridor Zone
Temp.

60. Some Temperature
Readings in many
room
Showing
the improvement
Reading on: 25/07/2015

61. Low Static Pressure
FCU
vs.
High Static Pressure
AHU

63. Convert to
Dynamically
Control Ch. W.
Sys
1) Connect VFD.
2) Add new
control to signal
VFD.
3) Utilize PICV
benefits
4) Shift Make-up
Pressurization
Pump.
Reduce
Long
Duct by
fixing
AHU at
Corridor
when
possible
Increase
ESP by
Empowe
r FAN
Motors
From 0.75 kw
to 1-kw
Enlarge
FCU to
AHU
from
2230 to
2400 cfm
Summary
Of Work Done

64. ‫بين‬ ‫حقيقي‬ ‫وتكامل‬ ‫برمجة‬
‫منظومة‬ ‫و‬ ‫التكييف‬ ‫أجهزة‬
‫إيميكوول‬ ‫من‬ ‫الذكية‬ ‫التحكم‬
Make Real
Integration
between you’re A/C
Units and emiCool
Smart Controller
‫التالية‬ ‫الخطوة‬
Next
Step

65. Also
Pumps Status has
been connected to
Central Control
System
Reading:
25/6/2015
Reading:
21/3/2015

66. To benefit from our
Integration Services:
Consultancies.
Corrections.
Call:
Dr. Taoufik A. Hadi
Eng. Juma Yousef
‫بنا‬ ‫تتصل‬ ‫كيف‬How to Call us ?
Mobile: +971-50-5439078 Fax: 06-5439079
jumayjuma@gmail.com