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Home
  • Products

    Actuators

    • Actuator Sizing and Selection
    • Non Fail-Safe Actuators
    • Fail-Safe Actuators
    • Actuators for Harsh Environmental Conditions
    • Fast Running Actuators
    • Linear Actuators
    • Fire Damper Actuators
    • Smoke Control Damper Actuators
    • Variable Air Volume
    • Valve Actuators

    Valves

    • Valve Sizing and Selection
    • Belimo Energy Valve™
    • Pressure Independent Control Valves
    • Zone Valves
    • Characterised Control Valves
    • Ball Valves
    • Butterfly Valves
    • Globe Valves
    • Potable Water Valves
    • Refrigeration Valves
    • Valve Actuators

    Sensors / Meters

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    • Duct Sensors (Air)
    • Pipe Sensors (Water)
    • Outdoor Sensors (Air)
    • Room Units
    • Thermal Energy Meters (TEM)
    • Belimo Energy Valve™ with TEM

    Systems

    • Belimo Energy Valve™
    • Room Solutions
    • Bus & System Integration
    • Fire & Smoke
    • Energy Manifold
    • Belimo ZoneEase™ VAV

    RetroFIT+

    • RetroFIT+ Product Replacement Tool
    • Make the Most Out of It
    • Upgrade Your System
    • Start with Minimal Effort
    • RetroFIT+ Zamenski proizvodi
    • RetroFIT+ Partner

    Applications

    • Data Centre Cooling Aplications
    • Air Handling Units (AHUs)
    • Room and Zone Applications
  • Support

    Services

    • Actuator Sizing and Selection
    • Valve Sizing and Selection
    • Sensors/Meters Selection
    • RetroFIT+ Product Replacement Tool
    • Tender Texts
    • Customer-specific products
    • Download Center
    • Service Tools / Apps
    • Software / Plug-ins / CAD
    • File Archive (Bus & System Integration)
    • Product and Price Catalogue / Datanorm
    • General Conditions of Sales and Delivery
    • Belimo Cloud: Login / Register
    • Thermal energy meter activation
    • Videos

    Belimo Education

    • Belimo Experience Centre (Vienna, Austria)
    • Belimo Experience Center (Hinwil, Switzerland)
    • Belimo Experience Center (Großröhrsdorf, Germany)
    • Company Tour (Hinwil, Switzerland)
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    Applications

    • Data Centre Cooling Aplications
    • Air Handling Units (AHUs)
    • Room and Zone Applications
  • About Us

    Belimo

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    Košarica je prazna.
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    Solution

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plate-heat-exchanger

District Heating or Cooling / Plate Heat Exchanger

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What is a Plate Heat Exchanger?

Plate Heat Exchangers are often used to separate primary and secondary circuits in HVAC systems. Those circuits may have different medium or static pressure conditions. Flow can be direct current or counter current.

Heat exchangers are extensively deployed in tall buildings to reduce the gravitational pressures provided by large water columns. Plate heat exchangers are also very common in District Heating and Cooling systems. Or in load circuits to heat potable hot water with a boiler.

plate-heat-exchanger-schematic


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Common Issues in Buildings and Why You Should Choose the Belimo Energy Valve™

Sometimes flow directions through the heat exchangers have not been chosen correctly. As a consequence the heat transfer capacity is reduced.

Heat Exchanger: Cooling transfer with direct flow    Heat Exchanger: ∆ϑm average temperature difference direct flow
The two figures below show two possible flow installations while the contraflow setup shows much better heat transfer. It results in larger delta T and thus higher energy efficiency to connect flow directions. The Energy Valve is able to recognize false flow directions. If this is detected an alarm flag will be sent to the BMS and this can be discovered during commissioning.

Heat Exchanger: Cooling transfer station contraflow    Heat Exchanger: ∆ϑm average temperature difference contraflow


A traditional setup plate heat exchanger will have an energy meter and a traditional balancing valve controlling the maximum flow through the heat exchanger. However, pressure fluctuations on the primary side cause the heat exchanger to overflow resulting in low delta T and poor heat exchange performance.

Heat Exchanger: Typical design flow (cooling application)    Heat Exchanger: ∆ϑm average temperature difference with design flow

Heat Exchanger: Overflow caused by pressure fluctuations    Heat Exchanger: ∆ϑm average temperature difference with overflow
By replacing the traditional balancing and control valve with a pressure independent valve, we solve the problem with the pressure fluctuations across the system. This is a step forward but still requires the application of multiple devices, including a separate thermal energy meter.

Heat Exchanger: Dynamic balancing
With a single EV we dynamically balance the system, monitor the energy usage for billing and record the delta T achieved. This reduces the equipment to be installed, making installation simple.

Dynamic balancing with delta T monitoring


Most Heat Exchangers suffer from fouling on one or both sides of the circuits. Minor fouling on one side can substantially affect the thermal energy transmission and drastically reduce the delta T.
The amount of time the Delta T Manager is active is indicative of the fouling process. If after a period of time the Delta T Manager remains active for extended periods then the heat exchanger should be cleaned or replaced.

Success Story: Tennessee State Office Building

tennessee_office_building

Citizens Plaza stands in the heart of Downtown Nashville. The Class A, 275,000 square feet,15-story office building was constructed in 1984 and houses multiple Tennessee governmental agencies. During a typical workday, it has anywhere from 800 to 1,200 occupants.“At Citizens Plaza, we were experiencing high utility thermal inefficiency charges from Metro Nashville District Energy System due to low Delta T and over pumping,” said Chad Lovell, Operations and Safety Specialist at JLL. After all, 15 Belimo Energy Valves became operational in Citizens Plaza, the average flow through the building during full occupancy reduced by over 200 GPM [12.6 l/s] versus the previous year when the original globe valves were still in place. As a result of the retrofit project, Belimo Energy Valves were able to reduce chilled water pumping by 49%, which equated to about $23,000 in annual savings.

  • Project Overview Video
  • Success Story – Tennessee State Building, USA (pdf - 1,91 MB)

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More about the Belimo Energy Valve™

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The Belimo Energy Valve™ in other HVAC Applications

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