Industrial grade PLC for HVAC solutions in industries

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Industrial grade PLC for HVAC solutions in
industries
www.messungautomation.co.in
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Messung's solutions are designed to share
information and make sure your  systems work
together maximizing both comfort and energy
efficiency while reducing energy expenses.
Whether new construction or retrofit
applications, Messungs expert can help you to
design, install, integrate and maintain your
control system with efficient energy management.
Messung's solutions have the flexibility and
scalability to adapt, and deliver results for
your building environment.

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About AHU
An Air Handling Unit (AHU) regulates and
circulates air as part of a heating, ventilating
and air-conditioning (HVAC) system. It consists
of a blower, heating or cooling elements, filter
racks, sound attenuators and dampers. It is
usually connected to a ductwork system that
distributes the conditioned air through the
building and returns it to the AHU. Sometimes,
AHUs discharge and admit air directly to and from
the space without ductwork. With the growing
emphasis on energy performance in buildings, and
new standards to study and improve energy
efficiency, buildings need automation control
systems to achieve high levels of energy
efficiency. HVAC is one area where huge amount
of power is consumed, and where plants with
energy-optimised design, installation and
commissioning are a must. Automation with
AHU-specific functions ensures more systems'
energy efficiency, operational reliability and
availability. Automation also monitors room and
outdoor temperatures to reduce cooling energy
needs and improve comfort levels.
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A Case Study
Our Customer is a Bengaluru based company
involved into manufacturing of Products like
Metal Working Tools, Mining, Foundation Drilling
cutting Tools, Tungsten carbide wear components
etc. required for Industries like Aerospace,
Additive manufacturing, Machine Tool Industry,
Energy, Earthworks.
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Basic AHU for Coating Room
The project required Messungs solution to ensure
that the coating room is maintained under 5 Pa
Negative pressure with respect to ambient and
within the room temperature zone of 21.1 Deg. C
to 24.4 Deg. C and RH Zone of 40 to 60. Since
the system is working round the clock, it is
necessary to control the system in such a way
that minimum power is consumed by the HVAC
system.  In addition, in case of any process gas
leakage in the coating room, fresh air supply and
exhaust to be operated at the its full capacity
to exhaust the leaked gases promptly.
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Messungs solution

• Messung proposed an AHU System which can maintain
  acceptable room conditions using 2 stage
  evaporative cooling or using chilled water
  cooling coil, depending on the ambient air
  conditions throughout the day and year.
• Variation of ambient conditions in Bengaluru
  through the day and year is such that the ambient
  air conditions can be used to maintain the
  desired room conditions for much of the time,
  mainly in cooler nights and winter season.
• Since the plant is working round the clock,
  Messung decided to make use of favorable ambient
  conditions to the best possible extent to
  minimize the power consumption by AHU system.
• Messung divided the variation of ambient air
  conditions throughout year, into 3 parts
• Mode -I, where in the ambient condition is hot
  and dry, where either single stage or 2 stage
  evaporative cooling can be used to maintain room
  conditions.
• Mode II, Monsoon conditions with high RH and
  not so cold temperature, wherein conventional
  chilled water cooling coil will be used to cool
  and de humidify and maintain the designed room
  conditions
• Mode III, typically winter conditions, Messung
  proposed to modulate return air and cold fresh,
  as well as single stage evaporative cooling to
  maintain the designed room conditions.

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Proposed Control System
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Salient Features

• Versatile CPU with large Input/Output signals
  handling capacity
• Capturing real time data for Temperature,
  Relative Humidity, Running hours for AHU
• Large program memory for implementing complex
  Relative Humidity formulas
• Incorporating of Program Algorithm based on
  Psychrometric chart readings
• Connection of CPU with 15 nos. of VFDs on MODBUS
  RTU control network
• Prompt monitoring controlling the entire system
  using HMI

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Psychrometric Chart
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Psychrometric Chart
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MESSUNG is an Automation Partner capable of
Supplying Solutions to any Project of Air
Handling Units and Environment Control Systems.
Messung's NX-ERA Series of PLCs for industrial
automation help to monitor, control and optimise
AHUs to ensure performance and efficiency of HVAC
systems. Messung's AHU control systems feature
these latest technology PLCs with user-friendly
interface to monitor and control each component
of the AHU including fans, heating, cooling,
humidification, heat recovery, etc. The systems
offer design flexibility with variable size
options and a wide range of choices to make your
facility more productive and energy-efficient.
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Thank you

• Contact us
• MESSUNG SYSTEMS PVT. LTD.
• 501, 502 503 Lunkad Sky Vista, Viman Nagar,
  Pune, India - 411 014.
• 91 20 6649 2800 info_at_messung.com

www.messungautomation.co.in