Best Energy Audit in Qatar

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Conserve Green Building MEP Solutions
Conserve Green Building MEP Solutions
WLL Office No 6, 6th Floor, Building Number
24, Al Khalidiya Street, Najma, Doha, Qatar.
P.O. Box 31718 T 974 4442 7968 F 974 4437
4210 www.conservesolution.com
bazeeth_at_conservesolution.com
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GSAS Certification
Initial and Operational Cost of different Air
Conditioning Systems in GCC A supporting case
for VRF Systems

• In one of our recent projects targeting GSAS
  Certification, we have advised the client to
  change the HVAC system from Split to VRF.
• The client asked us about the return of
  investment and payback period. We have worked out
  on the initial and operational cost for different
  AC systems.
• We are publishing the basis of calculation, so
  that it can guide other projects pursuing LEED or
  GSAS Certification to choose the right system.

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LEED Certification
In this article we will discuss 1. Installation
cost of different AC systems 2. Energy
Performance of different AC systems 3. Financial
analysis of VRF over air cooled central system
and split/package system 4. In what
cases the projects can go for VRF systems
1. Installation cost of different AC systems
Air Conditioning System Type Price in QAR per Nominal TR
Ductless Wall mounted/Ceiling mounted split system 1800-2000
Ducted split units 2500-3000
Package Units 3500- 4000
VRF Units 5000-6000
Air Cooled chilled water systems 6500-7000
Water cooled chilled water systems 8000-9000
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• Note
• The prices can vary based on the manufacturer,
  project specifications, Air distribution system
  etc.
• The prices mentioned here only approximate based
  on interview with different manufacturers and
  contractors.

2. Energy Performance of different AC Systems
In the absence of much literature on Energy
performance of different AC systems in the
region, the study recently conducted by RSB Dubai
appears to be very close and hence we will
consider the same for our calculation
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Energy Audit
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It is very clear that district cooling plants are
the most efficient followed by water cooled
central cooling system.
VRF Vs. Split System Cost Vs. Benefit
S.No System type kW/TR Installation Cost QR
1 Split/Window 1.73 1800
2 Ducted Split/Package 1.62 2750
3 Package 1.62 3800
4 VRF 1.07 5800
5 Air cooled chiller 1.42 7000
6 Water cooled chiller 0.93 9000
7 District Cooling 0.92 9000
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Equivalent full load hours 3750
   
Installed Nominal TR 500
Electricity Tariff 0.35
   
Energy Consumption of split units kwh 3037500
Energy Cost of split units QAR/annum 1063125
   
Initial Cost of split units in Million QAR 1.375
Initial cost of VRF Units Million QAR 2.9
   
Additional Investment in VRF Million QAR 1.525
Energy Consumption of VRF system kwh/annum 2006250
Savings in kwh/annum in VRF 1031250
Savings in Million QAR/Annum in VRF 0.360938
Simple payback period 4.225
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Energy Conservation
1. Financial analysis of VRF over air cooled
central system and split/package system
Air cooled Central AC System

• The prices of Air cooled system and VRF systems
  are very much similar hence there is no
  incremental capital cost for the project.
• The operational cost VRF system is lesser
  resulting in significant reduction in Life cycle
  cost of the AC system

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• Let us do the math for 500 TR building,
• Energy Consumption in Central Air Cooled System
  per annum 500 TR 3750 Equivalent Full load
  operational Hrs. 1.42 KW/TR
• 2662500 kWh
• Energy Cost 2662500kWh 0.35 QAR/kwh 931875

• Energy Consumption in VRF System per annum 500
  TR 3750 Equivalent Full load operational Hrs.
  1.07 KW/TR
• 2006250kWh

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• Energy Cost per annum 2006250kWh 0.35
  QAR/kwh 702187
• Savings per annum 656250 kWh
• Considering the life of the equipment to be 10
  years, the life cycle cost savings shall be 2.3
  Million QAR.

Split Air Conditioning System

• The prices of split or package shall be around
  lesser by QR 2500/TR compared to VRF systems.
• Let us do the math again for 500 TR building,
• Incremental Cost 500 TR QR 2500/TR QAR 1.25
  Million

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Energy Consumption

• Energy Consumption in split or ducted AC system
  per annum 500 TR 3750 Equivalent Full load
  operational Hrs. 1.62 KW/TR
• 3037500kWh
• Energy Cost 3037500kWh 0.35 QAR/kwh
  1063125
• Energy Consumption in VRF System per annum 500
  TR 3750 Equivalent Full load operational Hrs.
  1.07 KW/TR
• 2006250 kWh
• Savings per annum 1031250 kWh
• Simple payback period 4.225

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In the next article we will discuss more about
commercial aspects of Energy Conservation
Measures like Life cycle cost, Net Present Value
(NPV) and Internal rate of Return (IRR) which is
useful in Energy Audit.

• Factors to be taken care when going for VRF
  System
• Limitation in refrigerant pipe length
• Integration with conventional BMS system
• 3. Skilled maintenance.

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• Summary and conclusion
• If the project is evaluating VRF against Air
  Cooled chilled water system and if there is
  feasibility of VRF systems.
• The straight choice would be to go for VRF
  system
• If the project is evaluating VRF against split
  units the decision has to be taken based on
  financial priorities.

Thank You
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Conserve Green Building MEP Solutions
WLL Office No 6, 6th Floor, Building Number
24, Al Khalidiya Street, Najma, Doha, Qatar.
P.O. Box 31718 T 974 4442 7968 F 974 4437
4210 www.conservesolution.com
bazeeth_at_conservesolution.com