Case study: Dubai – Green Building through HVAC and AHU

AHU and HVAC Consultants: Green Building solutions Dubai, UAE

True Green Building Consulting with smart Air Handling Units.

Menerga Slovenia is a HVAC Consultant company whose core part of our business is creating a roadmap towards Sustainable Green Buildings for large buildings.

For new and existing buildings we provide:

For these buildings we also provide:

We create buildings for people. That’s why we create solutions where sustainability and comfort go hand in hand.

From the first idea to the final energy concept, we make hundreds of calculations, endless optimizations and simulations. In order to create a bulletproof plan towards your luxurious Green Building.

Every building is unique. That’s why no energy efficient solution is ever the same.

Green building solution_standard_advanced_platinum

Green building – what is achievable with AHU and HVAC?

 

REDUCE

RECYCLE

REUSE

 

  • 50%  reduction of electrical power for fresh air cooling
  • 50%  reduction of electrical power for cooling energy
  • 60% reduction of the needed heating energy
  • 50 – 60% reduction of CO₂ emissions throughout the year
  • Millions kWh of cooling and heating energy created with geothermal sources.

 

Investing in the big picture with an energy efficient HVAC System

Sometimes the best investments are the ones you don’t make. But sometimes the best investments are the ones with guaranteed returns and a valuable contribution to society.

One thing is for sure: The most energy efficient, economically rational and ecologically acceptable energy source is saving. That’s why we believe that the future for Green Building investment is green.

Investment

 

Asking invisible questions about Air handling Units (AHU)

Sometimes questions are more important than answers. They shape the thought process, the flow, the solutions.

We believe you need to ask the right questions if you are to find the right answers. Why? Because good questions outrank easy answers.

 

What…

  • are the building’s energy opportunities according to its geo-location?
  • is the optimal shell and what the necessary degree of insulation and glazing quality?
  • are the actual (!) optimal cooling and heating needs?
  • is a realistic ROI analysis?

How…

  • can we reduce the connection power?
  • can we reduce the energy consumption?
  • to optimize the biggest energy consuming devices for heating, cooling and ventilation?

Menerga AHU unit: Adsolair 56/58

Requirements with high thermal loads can be ideally met with the different cooling options of the units in series Adsolair. Series 56 Adsolair AHU with adiabatic evaporative cooling an achieves to cool up to 12 K* with water.

At series 58 the total cooling capacity is further enhanced with an integrated compression refrigeration system.

 

Performance parameters and options:

  • Filtering the air in any operating mode,
  • Corrosion-free heat exchanger made from polypropylene,
  • Pumped hot water heating coil,
  • Thermal bridge factor TB1,
  • Individually controllable performance parameters,
  • Complete unit, ready to connect, contains all structural elements for comfort air conditioning, including all control and regulation fittings,
  • Intensive quality inspection with factory trial run.

 

At a glance

  • For heat and cooling recovery,
  • Energy saving EC fans,
  • Integrated compressor refrigeration system (58 series),
  • Intelligent air bypass duct,
  • Two-stage supply air filtration,
  • Adiabatic evaporative cooling – cooling without electricity,
  • Integrated defrosting function,
  • Compact design,
  • Freely configurable HVAC system,
  • Fulfills the requirements of VDI 6022.

 

HVAC: Indirect adiabatic cooling – evaporative cooling

The Menerga Adsolair AHU system principle uses the advantages of indirect adiabatic evaporative cooling without the disadvantages of supply air humidification. A major component of the Adsolair principle is the double plate heat exchanger, in which the return air is “adiabatically” cooled. In return, the outside air is cooled by the humid, cold exhaust air, without being humidified.

The high efficiency rate lies in the fact that both processes (adiabatic evaporative cooling of the return air + cooling of the outside air) take place simultaneously in the heat exchanger. The high degree of temperature efficiency of the double plate heat exchanger allows significant cooling of the OA-SA by over 12 K*. If required, the compressor refrigeration system will switch on and cool the supply air even further.

* at OA = 34° C / 40% r.h

Adsolair_indirect_adibatic_evaporative_cooling

Adsolair_56_58_indirect_adibatic_evaporative_cooling

Case study: Dubai – Strategic HVAC and AHU Consulting

 

Necessary Energy Practice for a Green Tower Building:

  • Photovoltaic To Supply Renewable Energy,
  • Multilevel Building Management System and Energy Management System,
  • Smart Meters To Control And Interfrace With Building Loads,
  • Low Voltage Switchgear To Feed Floor Mechanical Equipment,
  • Chilled and/or Hot Water Fan Coil Unit with temperature control,
  • Automatic Flow Balancing Water For Chilled And Hot Water,
  • Shading,
  • Highly Energy Efficient Air Handling Units with renewable cooling potential,
  • Building Automation System (BAS): temperature, heating, shades, windows, etc.
  • Daylight Harvesting Lighting Controls,
  • Thermal Activation Of The Concrete Core (low Temp. Heating, High Temp. Cooling),
  • High Efficient Lighting Led And T5 Flurescent,
  • Meetering Control & Regulation (MCR),
  • High Voltage Electrical System To Minimaze Energy Losses In Distribution.

 

Sustainable cooling energy generation

The most important design step is the reduction of energy connection power in the buildings. A lot of electrical energy is used to generate cooling energy. The biggest consumers are air handling units.

High-performance technical solutions in air handling units allow us to reduce connection cooling power significantly. Let’s analyze two cases of the highly efficient air handling units with the air flow 50.000 m³/h.

 

Case studies

Case Nr. 1: HVAC in Dubai, UAE
Dubai Summer design conditions:

      • Outside air: 48 deg.C; 45% r.H.
      • Return/room air: 25 deg.C; 50% r.H.
      • Supply air: 18 deg.C; 100% r.H.

AHU System type: Menerga
Vh=50.000 m3/h
Indirect adiabatic cooling, efficiency 90%

 

Savings on cooling connection power: 55,6% of summary cooling capacity.

Cooling capacity of indirect adiabatic cooling: 725,7 kW (without energy consumption)
There is also to consider electrical connection power savings for the chillers which have to produce this cooling power, as well as trafo station, cabling, …

Additional cooling with chiller: 579,5 kW
Summary cooling capacity: 1.305,2 kW

 

 

Case Nr. 2: HVAC in Dubai, UAE
Dubai Summer middle conditions:

      • Outside air: 45 deg.C; 40% r.H.
      • Return/room air: 25 deg.C; 50% r.H.
      • Supply air: 18 deg.C; 100% r.H.

AHU type: Menerga
Vh=50.000 m3/h
Indirect adiabatic cooling, efficiency 90%

 

Savings on cooling connection power: 59% of summary cooling capacity.

Cooling capacity of indirect adiabatic cooling: 545,2 kW (without energy consumption)
There is also to consider electrical connection power savings for the chillers which have to produce this cooling power, as well as trafo station, cabling, …

Additional cooling with chiller: 375,0 kW
Summary cooling capacity: 920,2 kW


h,x Diagram

Case Nr. 1
hx-diagramm-1

 

hx-diagramm-1

Adiabatic cooling – Start points 1 and 4: Evaporation cooling with temperature transfer efficiency 0,9; 2-fache Eindickung des Umlaufwassers; Humidified air flow from 4 to 6

Cooling / Dehumidification – Start point 2; 18,0 °C leaving temperature

hx-diagramm-3-podatki

Case Nr. 2
hx-diagramm-2

hx-diagramm-2

Adiabatic cooling – Start points 1 and 4: Evaporation cooling with temperature transfer efficiency 0,9; 2-fache Eindickung des Umlaufwassers; Humidified air flow from 4 to 6

Cooling / Dehumidification – Start point 2; 18,0 °C leaving temperature

 

 

Download the PDF Case Study: Dubai here.

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