AHUs ERVs TM & (Air Handling Units) (Energy Recovery - - PowerPoint PPT Presentation

TM

Why should you opt for ENTHALPY

Wheels for your

from

AHUs

(Air Handling Units)

ERVs

(Energy Recovery Ventilators)

&

TM

Benefits of an

ERV (Energy Recovery Ventilator)

• ver a

HRV (Heat Recovery Ventilator)

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IEQ …… Indoor Environment Quality

• Indoor Environment or Quality of Indoor Air i.e. Invironment

 impacts comfort  Health  productivity and  perception of quality of the space cannot be ignored any longer.

• IEQ norms world wide requires more ventilation of conditioned

space.

• HRVs are installed to provide the required ventilation.

However, they are not really able to meet IEQ needs. . . . . . . why so?

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Energy Vs. Heat (Latent + Sensible Vs. Only Sensible)

Increased ventilation results in

• “high humidity levels” (a side effect), especially in tropical

countries . . . where latent loads are 2-3 times the sensible load

• Increase in the latent load tremendously. Thus, air-conditioning

equipment is unable to handle the situation resulting in increased humidity levels . . . . design of mould and mildew growth. Mould & mildew growth is directly related to the level of humidity inside the conditioned space. Thus, maintenance of the right level of humidity is of paramount importance.

Why ERVs and not HRVs?

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Optimum Humidity Ranges

Decreased in Bar Width Indicate Decrease in Effect Optimum Zone Bacteria Viruses Fungi Mites Respiratory infections* Allergic Rhinitis and Asthma Chemical Interactions Ozone Production 10 20 30 40 50 60 70 80 90 Percent Relative Humidity

*Insufficient data above 50% R.H. Source: Sterling: ASHRAE 1985.

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Relative Humidity Guidelines

Relative Humidity Level Description 0% - 30% Most fungi will not grow at these humidities. 40% - 55% Optimal Building Humidity for all parts of the occupied space, chases, dropped ceilings, plenums and behind drywall. 60% - 70% Approaching optimal range of humidity for growth; mold growth likely in such areas. > 70% Optimal humidity levels for most fungal growth. > 90% Typical humidity level downstream of cooling coils during cooling season without reheat. (Unavoidable tempering condition due to cooling process. Mixing and

• ff cycles restore RH to acceptable levels.)

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Energy Recovery Ventilators (ERVs) recover both sensible and latent loads

An ERV, exchanges the contaminated room air with fresh outdoor air, in the process recovering the energy from the exhaust air stream. The ERV consists of two blowers and an energy recovery device. The two blowers run continuously to exhaust the room air and replace it with an equal amount of fresh outdoor air. The energy recovery device exchanges energy between the two counter flowing exhaust and supply air streams pickings up the sensible or both sensible and latent heat from the cooler air stream and transferring to the warmer air stream or vice versa depending on the conditions. Helps Designers, contractors, building owners and operators to meet IAQ Standard ASHRAE 62 and conserve energy Enable ASHRAE 62 specified ventilation rates without increasing air-conditioning tonnage Reduces the CAPITAL AND OPERATING COST of air-conditioning equipment Ideal for new construction or retrofit applications Meets space limitation requirements/ (could be installed in the false ceiling area) Helps maintain right humidity levels despite increased ventilation rates.

Benefits of ERVs over HRVs

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Benefits of ERV using rotary Energy Recovery Wheels

Worldwide industry is opting for equipment with better sensible and latent efficiencies as – Controls excess humidity without over-drying an interior space Provides more ventilation in cold weather Eliminates core condensation and significant frost formation in virtually all applications Is a year-‘round system that makes sense in both cold weather and hot, humid weather since It can influence humidity in order to prevent excessively dry indoor air in the winter and excessively humid indoor air in the summer Recovers humidity maintained in the space through a humidifier Has higher sensible and latent efficiencies leading to saving of cooling and heating costs Has negligible cross-over of air from supply to exhaust side due to addition of a purge section Benefits of ERVs over HRVs . . . . . . Contd.

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Rotary Energy Exchangers

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Performance comparison

Enthalpy Wheels Vs Other Recovery Devices

E F F E C T I V E N E S S ( % ) P R E S S U R E L O S S ( I N . W G . ) 9 0 8 0 7 0 6 0 5 0 2 . 5 2 . 0 1 . 5 1 . 0 0 . 5 3 0 0 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0 9 0 0 1 0 0 0 F A C E V E L O C I T Y ( F P M ) E F F E C T I V E N E S S P R E S S U R E L O S S C O I L T Y P E H E A T P I P E P L A T E T Y P E H E A T W H E E L P L A T E T Y P E T W I N T O W E R H E A T P I P E C O I L T Y P E H E A T W H E E L

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The core of the ERV - Enthalpy (Energy

Recovery) Wheel

The Enthalpy (Energy Recovery) Wheel also has the additional advantage of being the only unit to deliver latent transfer

• efficiently. With the fresh air load patterns being highly latent in

nature and also, that there is a need to maintain a lower humidity in the conditioned space, the focus is on an energy recovery ventilator with enthalpy wheel. The enthalpy wheel is perfectly suited to help control humidity. In summer when the outside is hot and humid the enthalpy wheel is able to cool and dehumidify the incoming fresh air and in winter when it cold and dry outside it is able to heat and humidify.

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Enthalpy Wheels . . . Contd.

The enthalpy wheels with low first cost and maximum energy savings combine to give an extremely low payback. With the help of enthalpy wheels one can easily down size the installed air-conditioning equipment and can also result in negative pay back in many cases. Other advantages: Increases the SHF making it simple for cooling coil to handle the thermal load Would mean higher ADPs hence higher CHW temperatures. Low row deeps of cooling coils Avoid re-heat.

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Benefits of using enthalpy wheels

ARI and Eurovent certified wheels DRI can assist you in the design and development of units using our small size wheels Rotors have high density of desiccant and hence are favorable in size

• vs. performance ratios

Strong Research and Development teams Produced in a world class manufacturing facility In-house coating facility thus maintenance of tight process parameters Ability to make any combination of Diameter, depths, flute geometry and to customers design/specifications if required Highly polished rotor surface minimizes leakages through seals Can provide the complete cassette cutting down on customers expensive labor hours

TM

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Enthalpy Rotors

for ERVs (Energy Recovery Ventilators) PERFORMANCE CHART

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ERV Applications

The ERV can be applied a large number of applications including

Health Care – Nursing Homes, Hospitals, Clinics, Specialty Centers, Clinical Labs. etc. Entertainment – Cinema Halls, Multiplexes, Discotheques etc. Hospitality – Hotels, Restaurants, Pubs, Banquet Halls, Fast - Food centers etc. Commercial – Offices, Banks, IT complexes, Conference Halls etc. Places of assembly – Schools, Temples, Educational Instt., Supermarkets, Showrooms etc. Miscellaneous – Beauty Parlours, Gymnasiums etc.

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Energy Recovery Ventilators

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Energy Recovery Ventilators . . . . . .

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Energy Recovery Ventilators . . . . . .

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Heat Recovery Wheels . . . . . .

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Typical ERV Installation Options

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Case Study

1) Application Diamond Processing Unit 2) Location High Humidity City 3) Design Parameters - a) Fresh Air Requirement 1000 Cfm b) Fresh Air Conditions DBT(°C) WDBT(°C) Summer - 35 28.33 Monsoon - 29.44 27.78 c) Return Air Conditions DBT(°C) RH(%) Summer - 22.22 55 % Monsoon - 22.22 55% d) Hours of working/day 14 4. Assumptions Power Tariff/Kwh Euro 0.09 Power Consumption (KW/TR) 1.2 K.W

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Case Study. . . . . contd.

Total Energy Recovered with Energy Recovery Ventilators Summer 4.63 TR Monsoon 4.39 TR Summer Monsoon Energy Saved in TR 4.63 4.39 Energy Saved in Rs/Season 771.66 829.72 (after taking into account the daily and seasonal variations) Total Savings/Year In Rs. 1601.22

Using VLI (Ventilation Load Index) for Mumbai

Sensible Load = 7.38 tons hrs per scfm per year Latent Load = 25.26 tons hrs per scfm per year Total = 32.64 tons hrs per scfm per year

Annual Load for 1000 cfm on

14 hrs per day basis and 300 days per year = 1000 x 32.64 x 1.2 x 5 x 0.47 = 92,044

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customized to meet your requirements

ENTHALPY ROTORS CAN BE

TM

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Benefits for

Rotors can be customized - to your design To retrofit in your existing equipment No extra engineering at YOU. Complete engineering support from India Assured long term supply Total support provided through Selection Software Selection software can be tailor made, for easy incorporation in your own package Quick response, fast delivery, substantial capacity to meet large orders

with YOU

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Let us make a Winning Team

+

YOU

TM

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and DESICCANT ROTORS INTERNATIONAL Unlimited possibilities for Business Co-operation

YOU YOU

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Striving to exceed customer expectations

Specializing in technologies, products and services with “desiccants at the core”.

PEOPLE MANUFACTURING PRODUCTS SERVICES

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Fully integrated manufacturing facility for:

• Synthesizing / coating
• Winding
• Metal work (CNC)
• Surface finishing
• CNC fabricated &

powder coated

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DESICCANT ROTORS INTERNATIONAL

www.drirotors.com DESICCANT ROTORS INTERNATIONAL

Specializing in components for ventilation systems using

Honeycombing & Corrugation Technologies

TM Enthalpy & Sensible Rotors for Energy Recovery TM Desiccant Rotors for Dehumidification Evaporative Cooling Pads TM

REST OF THE WORLD

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Company and Product Profile

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Enthalpy & Sensible Rotors for Energy Recovery Desiccant Rotors for Dehumidification Evaporative Cooling Pads

TM TM

• Top of the line in performance
• Available in a variety of

combinations of substrates and desiccants.

• Cost effective solutions for

requirements of both low humidity and desiccant cooling.

• Manufacturing wide

range:250mm ~4250mm (dia) and 50mm,100mm, 200mm & 400mm(depth) .

• The preferred supplier to many

OEM’s in North America, Japan, Europe & Korea

• Made from aluminum substrate coated with

molecular sieve or silica gel.

• The “coated” wheels give you substantially

higher total recovery compared to the “etched”

• r corroded aluminum rotors.
• Our molecular sieve coated wheels allows you

to minimize cross contamination while ensuring high moisture efficiency.

• Our “silica gel coated wheels” give you the

highest latent recovery.

• Manufacturing wide range : 500mm ~ 5000mm

(dia) and 200 & 270 mm depths

• Our rotors are tested in state of art ITS certified

lab and are Eurovent certified

• In fact, our rotors were rated the highest in

performance in the applicable class in the Eurovent certification program.

• Both 5mm & 7mm flutes can be

customized for sizes and flute angles

• Manufactured on sophisticated

production line and use special grade chemicals and hence have tremendous advantages over

• ther competing products

available in the market

• Exported worldwide on container

basis

• We also manufacture special

grade glass fiber based Fire retardant pads

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CORE COMPETENCIES:

Fluted Media

• Rotors
• Desiccant
• Sensible
• Enthalpy
• Cellulose Pads

Over 200 “man-years” of research in the field of rotors, to create the ideal honeycomb/fluted media, best suited to every application.

Desiccant Based Technologies

• Drying
• Energy Recovery
• Cooling

DRI at the heart of it all

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Desiccant, for Dehumidification Energy Recovery Sensible Enthalpy Aluminum Foil Inorganic Fiber

Etched/Oxidized Aluminum Foil

Molecular Sieve

• n

Aluminum Foil Metal Silicate (Synthesized)

• n Inorganic Fiber

Silica Gel

• n

Aluminum Foil BEST for Minimal Cross- contamination BEST for Corrosive environment BEST for High Recovery / Efficiency (η)

• Not Recommended
• Inadequate Latent Recovery

     

x

() Available from DRI

Coated Aluminum Foil Coated/Impregnated Mylar Sheet/Organic Fiber

x

• Not Recommended
• Inflammable

Coated Aluminum Foil/ Inorganic Fiber

  

ROTORS

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• State-of-the-art R&D Labs, one of the best in the

environmental control industry and recognized by the Department of Science and Technology

• Have

recently setup a testing facility for performance evaluation of Enthalpy Wheels, in association with Intertek Testing Services, Cortland (Intertek Associates with ARI for the ARI 1060 Programme)

• Over 200 man-years on research

in the field of honeycomb rotors

• Continuously engaged in

state-of-the-art product development . . . . .

Research & Development …………….

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We’re never too far from you!

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Thank you!!