Tri mex. heat load profiling_full load scenario_delta-t for more cooling @ bpt-2-dubai_by getco

Cooling Load Profile
for TRIMEX New Offices @ BPT-2

Cooling Load Design
Compare to Load of Units Selected
Minimum Design Selection
Zone Type VAV FT2
TMBH CFM Btu cfm TMBH SMBH CFM Btu cfm ESP Petra Units Flow
# /ft2 /ft2 /ft2 /ft3 Pa Model TR Ltr/sec
Conference FCU-1 Non 473.44 29.3 947 61.9 2.0 36.3 27.5 1400 76.7 3.0 50 PDC-14 3.5 0.2275
Acc/Bala/Cr FCU-2 2-450-200 451.92 20.8 904 46.0 2.0 24.8 19 1000 54.9 2.2 75 PDC-10 2.5 0.18
Pr/SW/Reno FCU-3 2-340-370 269 20.9 538 77.7 2.0 24.8 19 1000 92.2 3.7 75 PDC-10 2.5 0.18
IT/Server FCU-4 Non 150.64 17.9 301 118.8 2.0 21.6 16 800 143.4 5.3 50 PDC-08 2 0.13
Admin/Sp/Tr FCU-5 2-350-300 774.72 31.8 1549 41.0 2.0 38 29.4 1600 49.0 2.1 50 PDC-16 4 0.26
Asst/Ex off-1 FCU-6 1-370 301.28 21.6 603 71.7 2.0 24.8 19 1000 82.3 3.3 50 PDC-10 2.5 0.18
Meet/Ex off-2 FCU-6' Non 318.496 26.4 637 82.9 2.0 32.9 24.6 1200 103.3 3.8 50 PDC-12 3 0.21
Reception FCU-7 Non 634.84 38.2 1270 60.2 2.0 38 29.4 1600 59.9 2.5 50 PDC-16 4 0.18
Chairman FCU-8 Non 344.32 35.3 689 102.5 2.0 38 29.4 1600 110.4 4.6 50 PDC-16 4 0.18
Ex.Mr/Dir FCU-9 2-850-1050 581.04 39.9 1162 68.7 2.0 38 29.4 1600 65.4 2.8 75 PDC-16 4 0.18
Lou/Meet. FCU-10 Non 559.52 26.3 1119 47.0 2.0 32.9 24.6 1200 58.8 2.1 75 PDC-12 3 0.21
Ex. Maglis FCU-11 Non 504.375 38.8 1009 76.9 2.0 38 29.4 1600 75.3 3.2 50 PDC-16 4 0.18
Total 5363.59 347.2
1072
7
2 388.1 2.2975
TR 28.9 TR 39.0 T.Flow
Selected Units are always exceed peak calculation. For example, a 3 TR fan coil unit will be
selected to deliver a capacity of 2.7 TR as the lower standard size (2.5 TR) cannot be selected

1200 cfm-3 TR
FCU-11
1600 cfm
4 TR
FCU-11
1600 cfm
4 TR
FCU-08
1600 cfm
4 TR
FCU-07
1600 cfm
4 TR
FCU-06’
1200 cfm
3 TR
FCU-6
1000 cfm
2.5 TR
FCU-05
1600 cfm
4 TR
FCU-2
1000 cfm
2.5 TR
FCU-3 1000
cfm 2.5 TR
FCU-4
800 cfm
2 TR
FCU-1
1400
cfm
3.5 TR
Units
Distribution
39
TR

3-TR
4 TR
4 TR4 TR
3 TR
2.5
TR
4 TR 2.5
TR
2.5 TR
2 TR
3.5
TR
22 TR; N
15 TR; S
13.5
TR;
W
2 TR
+
2 TR

Total Cooling Load Required: 26.69 TR
as Per Dubai Municipality Calculator
for the hall space as One Zone
TOTAL LOAD
without Treated FA
BTU/HR CFM
Total Grand Load 320,312 Supply Air 13680
Total
Sensible Heat
259,928 Return Air 12712
Total
Latent Heat
60,384 Out Door Air 968
TONS BTU/HR.FT2 CFM/FT2 Flow L/sec
26.69 49.61 2.12 1.64
Calculate the Cooling Load for each office/zone
individually is: 28.9, while when we calculate the hall
space found: 26.69 TR (That’s more accurate)

0
5
10
15
20
25
30
35
40
45
Total Selected Load Total Design Load/RM Total Design Load TDL-with Treated FA Max. TR for Given Flow
TR vs. Cooling Load Calculations at
more Scenario & Compare to Available
Given

Since available Flow is: 1.462 Ltr/sec and Selected Unit
Flow is: 3.69 Ltr/sec, while our Peak Flow is: 2.526,
both are more than given flow of 1.462 Ltr/sec
• Total Calculated Cooling load for each Office individually
indicates that the peak load is 28.9 TR (2.735 Ltr/sec). While
Calculated Load for the hall area is: 26.69 TR (2.526 Ltr/sec)
TR Equipment has been selected In order to deliver the
proper sensible and latent load of all spaces. Due to
standardization of cooling equipment such as fan coils, it is
not possible to exactly match the cooling capacity of space
with the nominal capacity of the equipment. For example, a 3
TR fan coil unit will be selected to deliver a capacity of 2.7 TR
as the lower standard size (2.5 TR) cannot be selected.
Therefore, the total nominal capacity of the equipment used
is 39 TR (3.69 Ltr/sec).

So Cooling at Peak Load is:
Not OkayWhen compare Maximum

TOTAL LOAD
with Treated FA
BTU/HR CFM
Total
Sensible Heat
214,711 Return Air 11301
Total
Latent Heat
13,897 Out Door Air
19.05 35.41 1.75 0.8012
Considering that Fresh Air Supply is: 15’C
Since specification is showing that FA-Fresh Air Supply
Temperature is: 15’C
Run DM-Calculator will lower Total Cooling Load to:
19.05 TR (1.803 Ltr/sec)

Since Maximum Cooling Load Flow is: 1.803 Ltr/sec (If we
controlled the FA-Condition), and since available Flow is: 1.462
Ltr/sec
We can’t get the Comfort Cooling unless we manage part load
condition
• If Building provided FA-Fresh Air at 15’C as per specification
the total Calculated Cooling Load will decrease to 19.05 TR
(1.803 Ltr/sec).
• To ensure FA efficiency will continually monitor the supplied
fresh air condition, and response accordingly:
• If RH% increased (More Latent Load) we’ll close the Actuator
of fresh air and extract.
• If temperature of FA increases will close both also to reduce
the load.
• When offices are vacant after working hours, we’ll close the
unnecessary fresh air and exhaust to reduce total heat load.

So Cooling at Peak Load is:
Not Okay Yet….

West Zone
TOTAL LOAD with Treated FA
BTU/HR CFM
Total
Sensible Heat
133,558 Return Air 7029
Total
Latent Heat
4,053 Out Door Air
11.47 73.08 3.73 0.482
West Zone
TOTAL LOAD without Treated FA
BTU/HR CFM
Total
Sensible Heat
150,967 Return Air 7573
Total
Latent Heat
14.41 91.83 4.22 0.606
Considering that Fresh Air Supply above: 15’C

North Zone
BTU/HR CFM
Total
Sensible Heat
91,314 Return Air 4295
Total
Latent Heat
10.12 47.02 1.86 0.426
North Zone
BTU/HR CFM
Total
Sensible Heat
Total
Latent Heat
5,559 Out Door Air
6.08 28.27 1.37 0.256

South Zone
BTU/HR CFM
Total
Sensible Heat
Total
Latent Heat
4,285 Out Door Air
4.56 27.49 1.33 0.192
South Zone
BTU/HR CFM
Total
Sensible Heat
Total
Latent Heat
7.67 46.24 1.82 0.323

3-TR
4 TR
4 TR4 TR
2 TR
+
2 TR
3 TR
2.5
TR
4 TR 2.5
TR
2.5 TR
2 TR
3.5
TR
When
Distribute
the Cooling
Load for
Zones

Office can be divided in to 3 Zones
6.08 TR; N
4.56 TR; S
11.47
TR;
W

TR vs. Cooling Load Calculations at
more Scenario & Compare to Available
0
5
10
15
20
25
30
35
40
45
Total
Selected
Load
Total Design
Load/RM
Total Design
Load
TDL-with
Treated FA
Max. TR for
Given Flow
West Zone
with T.FA
West Zone
without T.FA
North Zone
with T.FA
North Zone
without T.FA
South Zone
with T.FA
South Zone
without T.FA
Given

To ensure closing the gab between
Available & Maximum Required Flow
we must test the part load scenario
• West Zone needs 11.47 TR (1.36 Ltr/sec) at its peak around
4:00 P.M. (Assuming units are working at full capacity).
• While North Zone needs 6.08 TR (0.575 Ltr/sec) at its peak
(Knowing that north zone had the least heat load).
• While South Zone needs 4.56 TR (0.432 Ltr/sec) at its peak
around 12:00 P.M. (Knowing that north zone had the least
heat load).
• It is true that the total required Flow at Peaks (2.09 Ltr/sec) is
still exceeding the maximum given flow of (1.462 Ltr/sec)

• Design & selection
of A/C system
depends on Peak
the Peak.
• Peak is at Hour
16:00 (4:00 P.M.)
Peak of Heat Load
Time 4 8 12 16 20 24

What do we mean by Diversity ?
Since the sun rays are not
direct on all the building
orientation at the same
time: The Peak can’t
happen at all zones at
the same time
While West side receiving
highest sun heat, North
& South Sides will
receive limited heat as
shown in the Curve
(Sample).

Please Note How
Peak Load Can’t
Occur at the Same
Time in all Zones
Conclusion: That
Peak Load at any
moment can’t the
sum of Peaks of
all zones.
W
S
E

To ensure precious flow control that can meet the
required flow to maintain the instant flow at peak
we are going to fix
Dynaimc Flow Control Valves …. As follows:
• Total Heat Load at Peak can be: 11.5 TR (West) + 3 TR (North)
+ 2.5 TR (South)= 17 TR (1.609 Ltr/sec).
• This scenario close the gap between peak and maximum
available chilled water flow of: 14.5 TR (1.462 Ltr/sec).
• Keeping the FCUs at low set point from early morning to
achieve low set point of (20-22’C) before peak time of
4:00P.M., this will ensure that we required part flow to
maintain part load.

Dynamic Flow Balancing Valves
• Dynamic Flow Valve is a
combined pressure
independent flow limiter and
control valve. The new and
innovative range of dynamic
balancing valves operates
independently of changes in
system pressure in water-
based cooling or heating
systems.
Dynamic can operate either as
an automatic flow limiter and
control valve or, alternatively
without the actuator, simply as
an automatic flow limiter.
Intelligent Valve-IPCV
Independent Pressure
Balancing Control Valves
This will reduce flow to half

This measure will benefit both
Tenant & Land Lord
• To higher Delta-T of flowing chilled water at TriMex Offices,
we design our piping system to connect both Supply & Return
in Common headers to divert the limited chilled water to
where it needs more.
• Selected FCUs are design for DC-Delta-T of 16’, by cycle the
water more than 10 times facing air, also by creating more coil
resisterant.
• Utilizing the benefits of eDPCV (Electronic Pressure
Differential Control Valve) will slow the water velocity to allow
crossed air to absorbe maximum cooling with least amount of
water.

eDPCV
Electronic Pressure Differential Control Valve
• eDPCV is simply a smart
Pressure Differential
Controller that will
create best pressure
conditions for
Modulating Control
Valves to work
according to actual
demand
This will allow Control Valves to reduce flow
to half

More Heat Rejection Methods:
More Reduction of HL

Fact:
How heat is transferred
100 % of Sun
Heat
Load
86%
CONDUCTION
CONVECTION
RADIATION
7%
7%

Existing Glass Showing Reflecting Film at
50% of the Glass

Using BTU/ft2 Meter
Electronic Pressure Differential Control Valve
More Heat Penetrate Through Clear Glass:
4 Times Compare to Reflecting Film

Convert Results to Percentage %
Setting Clear Glass as 100%, the Penetrate
through Reflecting Film is 26% Only

Since 6 TR of
Calculated Cooling
Load are to Cool the
Extra Heat Load from
Glasses & specially
the Clear Ones.

Better to
Reflect the
Direct Sun:
Utilize Films
Which Side
has the
Film??????

We Advice to Use
More Reflecting Films
Possible to use
Reflecting Film
that are Clear with
Maximum Light
Penetration While
Reflecting Max.
Heat

Best Film
Reject Heat & Visible Light Through

More Cooling Waste Refusing:
More Flow Management

Possible to Reduce Cooling Wastage at
Vacant Office by Occupancy Sensor
And Connect to Pre-Set Temperature that is
higher than Desire “Set-Temp.”

Difficult
Side
Most
Important,
Most
Challenging
Back Offices
expected to need less
flow, away from
direct Sun.
Offices
with more
occupants
facing
North
(Less Load)
Units Distribution
Allow for better Flow
Management by
Occupancy Sensors
39
TR
Most
Challenging
Side

More Accurate Calculation Methods:
LESS Cooling Load Req.

Using
For
more
Load
Analysis
& divide
for
more
zones

Without any load for Fresh Air, since Building
provide Fully Treated Fresh Air & Exhaust

Total Cooling
Load: 16.8 TR
Min
1.8 cfm/ft2

Since available Flow is: 1.462 Ltr/sec and Selected Unit
Flow is: 3.69 Ltr/sec, while our Peak Flow is: 1.59, both
are more than given flow of 1.462 Ltr/sec
• Total Calculated Cooling load-by HAP- for each 5-Zones
indicates that the peak load is 16.8 TR (1.59 Ltr/sec).
The Challenges will be:
• How to absorb maximum cooling out of limited Water.
• How manage effectively the limited cooling load capacity.
• How to reduce the unpleasant heat load without compromise
of awesome view.
• How to reduce waste cooling in vacant zones.
• How to monitor the fresh air condition to reduce heat load.

After Commissioning – ‫التشغيل‬ ‫بعد‬

Central HMI-Controller @ TriMex

Offices Layout Map-Touch Desire Zone

Functions that Can be Controlled & Monitored

Setting can
be Adjust as
per
personalized
comfort

Smart Thermostat Connected to Controller

Controller for Each FCU Connected to
Central Controller-HMI

12 Controllers are Connected to 12 A/C
Units

VAV Boxes for small offices. Allow
Independent Control

VAV Thermostat-Temporary
To be Replace with Original within 4-Weeks.

Consumed Now-CH.W.Flow: 0.8 m3/h
=0.22 Ltr/Sec < 1.67 Ltr/sec Available
Flow Energy Meter
Showing Chilled Water
Optimization

Thank you! Looking forward to serve-U better
Eng. Juma Yousef Juma
CEO & Business Development Manager,
Getco Green Earth Technology Co. & Al-
Sadarah Engg.
Follow us for the latest news and information on
Solutions of HVAC Challenges.
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-%D8%B5%D8%A7%D9%84%D8%AD-
9941b049/

Tri mex. heat load profiling_full load scenario_delta-t for more cooling @ bpt-2-dubai_by getco

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Similar to Tri mex. heat load profiling_full load scenario_delta-t for more cooling @ bpt-2-dubai_by getco

Similar to Tri mex. heat load profiling_full load scenario_delta-t for more cooling @ bpt-2-dubai_by getco (20)

More from Juma Yousef J. Saleh جمعة يوسف جمعة صالح

More from Juma Yousef J. Saleh جمعة يوسف جمعة صالح (20)

Recently uploaded

Recently uploaded (20)

Tri mex. heat load profiling_full load scenario_delta-t for more cooling @ bpt-2-dubai_by getco