District Cooling and the Effects of Low Delta T

    Posted on Mon,Mar 05, 2018 @ 09:36 AM

    new-chiller-1.jpgDistrict cooling is the centralized production and distribution of cooling energy. Chilled water is delivered from a centralized energy plant through an underground pipeline to commercial, industrial, and residential buildings to air-condition using chilled water.  Excess heat is extracted from the building by the air conditioning systems’ heat exchangers. The water is then returned to the central energy plant.

    District cooling plants operate to meet the cooling energy demand of their customers, which could be dozens of buildings in a college campus or municipality. District cooling systems offer lower up-front construction costs and eliminate the need for chiller plant maintenance at the building level.

    Customers of a district cooling plant pay for the volume of chilled water delivered to their building and may pay other charges as well.  A peak demand charge may be assessed and penalties for returning water below the design or contracted temperature due to poor heat exchange. Our industry has proven that lower return water temperatures and low delta T decrease the efficiency of the entire chilled water system.  This condition is known as “Low Delta T Syndrome.”  Low Delta T syndrome is the result of the inefficient use of chilled water at the point of consumption.  Belimo is sponsoring a webinar with High Performance Building on District Cooling and the effects of low Delta T.  This webinar will provide a review of district chilled water system design and how low Delta T impacts both the chillers and the buildings the chillers are serving. We will also cover low Delta T and how it impacts pumping, causes of low Delta T, attempts to correct low Delta T and the relationship between low Delta T and chiller capacity. In conclusion, we will review a study of a building where “Low Delta T Syndrome” was corrected at the point of water to air heat transfer.

    Webinar Objectives:

    • Identifying the importance of system design and pumping arrangements
    • Understanding the relationship between GPM and Delta T
    • How to calculate Btu and Tons
    • The types of district cooling building connections
    • Why maintaining Delta T is important in a district cooling system

    Register today!

    HPB Marketing_728 x 90.jpg

    Tags: Belimo News, Technical Tips, Online Learning Resources & Tools

    FEBRAVA Review

    Posted on Tue,Sep 26, 2017 @ 06:20 AM


    FEBRAVA, the International Refrigeration, Air Conditioning, Ventilation, Heating, and Air Treatment Fair, celebrated its 20th year.  With over 30,000 visitors and over 31 miles of exhibit space; it is the most important event in the HVAC-R chain in Latin America, covering every sector in this market. It is the ideal location for buyers, installers, consulting engineers, distributors, wholesalers, and engineers to enhance their technical knowledge and get a first-hand look at the newest launches, trends, and innovations in the market and expand their network.

    This year, FEBRAVA had over 300 exhibiting companies covering:

    Refrigeration Making Ice Plugs
    Air-Conditioning Food Conservation Thermal Insulating Materials
    Ventilation Chambers Linings
    Pollution Control Refrigerated Display Counters Fridges Floors
    Treatment of Water Heat Exchangers Windows
    Treatment of Air Refrigerated Transport Applied I.T.
    Treatment of Sewage Compressors for Refrigeration Associations
    Treatment of Gases Instruments & Controls for Refrigeration Banks
    Treatment of Waste Products Instruments & Controls for Air-Conditioning Entities
    Equipment for Heating Hydraulic & Electrical Components Technical Publications
    Solar Collectors Pumps Services in General
    Heaters Engines  
    Greenhouses Valves  

    FEBRAVA featured lectureson air conditioning in hotels the profitability of comfort and efficiency, alternatives to achieving energy-efficient results, innovation in refrigeration, and the storage, and transporting of food, in order to minimize waste. A variety of technical sessions were also available. For example, Belimo’s technical session covered how to improve HVAC systems and increase efficiency in hotels.


    At FEBRAVA, Belimo was excited to announce the release of HVAC sensors, the advanced technology butterfly valve, and the IoT connected Belimo Energy Valve which was the recipient of the 2017 FEBRAVA Innovation Award. The new Belimo Energy Valve is now an IoT device utilizing advanced cloud-based analytics to leverage captured system data to the full potential providing savings and the most efficient operation. The Energy Valve is a pressure independent valve, which measures and manages coil energy by using an embedded electronic flow meter, along with supply and return water temperature sensors. It is ideal for water-side control of heating and cooling coils with programmable maximum flow settings from 1.65 - 713 GPM in valve body size ½” to 6”.


    The range of sensors by Belimo is the result of over four decades of experience, research, and focus on providing value-added technologies that help reduce expenses and installation. Belimo sensors seamlessly integrate into major building automation systems (BAS) with the same quality, reliability, and value that define Belimo. Belimo’s expertise and ability 

    to innovate are evident with the universal compact enclosure design, intuitive screwless snap cover, and detachable mounting plate making installation and commissioning easy.

    With a focus on quality, the Belimo sensors carry a five-year warranty, conform to NEMA 4X and IP65 requirements and are UL compliant. The Belimo sensor offerings include single and multi-range: temperature, humidity, pressure, CO2, and VOC (volatile organic compounds) sensors for pipe and duct applications. 

    Belimo continues to make advancements in the comfort, energy efficiencies, safety, installation and maintenance in HVAC applications. 

    Take a look at Belimo at this years FEBRAVA fair.

    Want to learn more about Belimo, visit www.belimo.com.br/ or email us

    Tags: Belimo News, Innovation Award, Online Learning Resources & Tools, Green Building Technology

    Introduction to Belimo Sensors Training Course

    Posted on Wed,Sep 06, 2017 @ 03:45 PM

    Belimo University known for its comprehensive training programs has just released an online module on Belimo Sensors. This training provides an understanding of the features and benefits of sensors, their functions within an energy management system and best practices for installation of sensors in common applications.

    For HVAC controllers and Building Automation Systems (BAS) to manage and maintain system performance, they require accurate and reliable sensor inputs. In stand-alone systems, the sensors measure the value of the controlled variable, and transmit the data to the DDC controller to position the dampers, valves, fans, pumps, or other controlled devices for occupant comfort and HVAC equipment safety. Sensor outputs with active or passive signals communicate directly to the DDC controller and the BAS with BACnet MSTP or Modbus RTU protocol. Learn about Belimo sensors and the benefits they offer by taking this 30 minute online training with topics that include:

    • Fundamentals of sensorsOnline_Sensor_Training.jpg
    • Understanding of sensors functions in an energy management system
    • Importance of sensor measurement
    • Sensor types (temperature, humidity, pressure, CO2, and VOC for pipe, duct, and outdoor applications)
    • Differences between passive and active sensors
    • Differences between auto zero and manual calibration
    • Belimo Sensor nomenclature
    • Features and benefits
    • Review of some HVAC applications
    • Best practices for installation

    With unlimited access to a collection of HVAC online modules, Belimo University is the easiest andfastest way to get the training you want. Simply go online and complete a one-time registration to access the complete Belimo University Online library of training.

    Online training modules offered by Belimo University include: (computer image with training course)

    • Introduction to Sensors
    • Introduction to Damper Actuator Sizing
    • Introduction to Control Types
    • Introduction to Valve Characteristics and Valve Limitations
    • Introduction to Valve Sizing for Water Systems
    • Introduction to Pressure Dependent Valves
    • Introduction to Retrofitting Butterfly Valves
    • Introduction to Retrofitting Globe Valves

    Discover all the offerings of Belimo University.

    Tags: Belimo News, Free Items, Green Building Technology, Online Learning Resources & Tools

    Belimo Energy Valve™:  Making Systems Energy Efficient, Easier to Control and More Transparent

    Posted on Tue,Feb 21, 2017 @ 11:15 AM

    The Belimo Energy Valve is an advanced pressure independent control valve that can drastically reduce the amount of water used to cool or heat a space.  By increasing the overall efficiency of the heat transfer, energy savings can be achieved.  In addition, the Belimo Energy Valve provides unparalleled transparency to the system and can drastically improve the controllability of complex hydronic systems.

    Join us for this webinar to understand the practical science behind the improved performance and the potential gains that can be realized in your buildings. The webinar will cover:

    Why Hydronic Design Models Don’t Match Building Performance

    Modelling softwares make a few faulty assumptions about basic hydronic behavior which can lead to disappointing building performance.  By selecting and installing proper equipment, engineers and contractors can be successful in achieving the modelled results.

    Understanding and Improving Heat Transfer at the Coil

    By understanding the thermodynamics behind the heat transfer at coils and heat-exchangers, we can devise better control strategies to better match the water flows to the specific loads in the space.  When done properly, most buildings can use far less water to heat and cool, and thus save large amounts pumping and plant energy.

    Static vs. Dynamic Balancing

    Until examined closely, the true benefits of advanced control valve technology, may be overlooked from a control and comfort standpoint.  By exploring dynamically balanced systems, we can see how we can hope to have more stable loops and more comfortable spaces.

    Belimo Energy Valve

    The Belimo Energy Valve is an electronically pressure independent valve with a fully integrated BTU meter.  It has the ability to control flow, manage Delta T, monitor system glycol percentage and fully expose the performance of the equipment.  With advanced communication platforms, which include BACnet, MODbus, IP and cloud based optimization, the Belimo Energy Valve provides unparalleled access to all of the data.

    Case Study Review

    See results from actual Belimo Energy Valve installations.

    Register Now!


    Tags: Belimo News, Free Items, Green Building Technology, Online Learning Resources & Tools, Technical Tips

    ASHRAE Supplier Sponsor Webinar on Dynamic Balancing

    Posted on Tue,Aug 23, 2016 @ 09:00 PM


    Pressure Independent Valves offer system stability, improved efficiency and overall versatility that can only be achieved in a dynamically balanced hydronic system. During this webinar you will learn how partial loads can wreak havoc on statically balanced systems and how static balancing devices under perform the majority of the time. See how pressure independent valves can keep your system balanced at all loads and flow, eliminate overflows, and achieve perfect valve authority.

    Join us on Thursday, September 15th at 11:00AM PDT / 2:00PM EDT as Dick Hubbell, Regional Application Consultant for Belimo America discusses why design and modeling data doesn't always match a building’s actual performance.

    Energy and performance models make a few faulty assumptions about hydronic performance. By understanding these assumptions, we can have a better view of actual performance. This presentation will examine the performance impact of improper valve sizing, unstable system pressures and balancing device selection. We will also examine the physical effects of valve authority and coil degradation in hydronic systems.
    In this session we will discuss:

    • Design and Modeling Assumptions

    • Hydronic Heat Transfer at the Coil

    • Hydronic Performance Problems

    • Valve Sizing

    • Static vs. Dynamic Balancing

    • Coil Performance

    • Optimize Potential Performance Solutions

    Register Now.

    Tags: Belimo News, Technical Tips, Online Learning Resources & Tools

    Setting up an Economizer Webinar

    Posted on Tue,Sep 02, 2014 @ 10:00 PM

    Economizer RTU

    In this 30 minute webinar, you will learn how to set up an economizer to match the specific climate zone profiles, and code requirements of different regions. We will also provide an overview on the different economizing strategies, how maximize energy savings and how the ZIP Economizer eliminates the guess work of code compliance, and ensures you are automatically set up.

    No registration needed. Just click on this link on September 17th at 11:00 am EST.

    Tags: Online Learning Resources & Tools, Technical Tips

    How to Save Energy with Economizing

    Posted on Tue,Jun 24, 2014 @ 10:00 PM

    Airside economizing has become one of the quickest and most efficient routes to reliable energy savings and improved indoor air quality. In addition to reduced power costs resulting from increased HVAC system efficiency, owners and operators that utilize airside economizers often have the opportunity to further increase savings by taking advantage of a number of federal, state and local energy rebates and incentives. Belimo ZIP Economizer

    In this 30 minute recorded webinar, you will learn how to get efficiency strategies back on track with easy setup, automatic code change over temperatures, and superior troubleshooting capability. You will understand how you can instantly know when failures occur and how to quickly pinpoint and address any problems.

    Click on this this link to listen to the recorded webinar along with session on questions and answers.

    Tags: Online Learning Resources & Tools

    Free, Live NEBB Webinar, New Technology to Improve Delta-T Syndrome

    Posted on Mon,Oct 29, 2012 @ 10:00 AM

    Predicting tomorrow's complex technical issues and solutions is a challenge. Stay current withNEBB NEBB's webinar series - NEBBinar - live webcasts that will provide insights on key changes affecting your business.

    On November 13th at 4:00 pm (EST) NEBB along with Belimo Americas will be hosting a webinar on: New Technology to Improve Low Delta-T Syndrome Large Facilities. Low Delta-T Syndrome is a common (and costly) problem in many large facilities, especially on sprawling campuses with central chilled water plants. Learn how the new Energy Valve helps detect and address all of the following scenarios that commonly impact coil performance and thus system efficiency:Delta T

    • Coil degradation due to fouling and scale
    • Improperly sized coils
    • Poor valve authority results in under or overflow of the coil
    • Changes made elsewhere in the system that frequently impact other circuits which are inherently interactive

    Once these problems are eliminated, the opportunities for system wide optimization open up.  At that point, owners, engineers, and contractors realize a host of benefits enabled through the Belimo Energy Valve:

      • Combat Low Delta T. The risk of Low Delta T (the most common culprit of major system inefficiencies) is dramatically reduced or eliminated.
      • Enhanced Energy Optimization.  Owners capitalize on optimization strategies such as variable flow pumping without risking occupant comfort.
      • Improved Commissioning. Start-up commissioning as well as retro-commissioning is greatly simplified.
      • Better System Maintenance. Operators are much more informed about coil performance and thus better able to schedule preventive maintenance measures.
      • Green Certifications. The Belimo Energy Valve’s ability to analyze, document and optimize performance data to the BAS contributes toward satisfying credit EAc5: Measurement and Verification under LEED.
      • More Effective Control. Engineers are able to implement more advanced control strategies by taking advantage of the data logging provided at individual coils.
      • Smaller Equipment. Buildings are able to meet comfort demand with smaller, less expensive piping and equipment.
    Register Now!

    About NEBBNEBB
    Established in 1971, the National Environmental Balancing Bureau (NEBB) is the premier international certification association for firms that deliver high performance building systems. NEBB members perform testing, adjusting and balancing of heating, ventilating and air-conditioning systems, commission and retro-commission building systems, execute sound and vibration testing, building envelope testing, test and certify laboratory fume hoods, and electronic and biological cleanrooms.

    There are more than 650 NEBB Certified Firms worldwide and over 1800 NEBB Certified Professionals and Certified Technicians. They are recognized by the industry and building owners as specialists having the skills necessary to measure the efficiency of building systems, and as the leaders in practical knowledge and communication skills for creating customized solutions for business owners. NEBB Certification offers tangible proof of their qualification in the procedures outlined for NEBB disciplines.

    NEBB delivers through Certifications, Procedural Standards, seminars, publications and through the NEBB Quality Assurance Program.  To learn more at www.nebb.org


    Tags: Online Learning Resources & Tools, Green Building Technology

    Pressure Independent Control Valve Technology: What’s in it for YOU?

    Posted on Mon,Oct 08, 2012 @ 10:00 AM

    Building owners don’t care about what Pressure Independent (PI) Control Valve technology does. They only care about what it saves. With the new Belimo PIV Energy Modeling Plug-in, mechanical designers can accurately determine the energy savings associated with PI control valves. And they can share this valuable information with building owners in a way that is valuable and real to them!
    The PIV Plug-in was developed for use with two of the most popular building energy simulationTrane Trace™ 700 tools on the market, Trane Trace™ 700 and DOE eQuest to answer these important questions:
    •    What’s the payback for using PI control valves in a given building?
    •    How do I quantify the benefits of PI technology so I can justify the cost to an owner?
    •    How many LEED points can I get for using PI control valves?

    “Best Case” Versus “Base Case”
    How much energy does a poorly controlled hydronic system waste? Until now, we never really knew. That’s because most modeling tools assumed the impossible – that all pressure dependent control systems controlled flow perfectly!

    We know that’s not the case. The fact is, without pressure independent technology, hydronic systems suffer from inaccurate control all the time. Chronic over-flow through coils, poor waterside ∆T, and inefficient operation problems are the rule, not the exception. This is evidenced in the epidemic numbers of “Low Delta T Syndrome” in HVAC systems.

    Engineers could never really accurately model energy efficiency with these “best case” assumptions. Nor could they demonstrate the benefits of pressure independent control without a “base case” comparison. Not until now.

    Modeling that Reflects Real World Scenarios
    With the help of Belimo’s PIV Energy Modeling Plug-in, engineers can finally model a building with and without pressure independent control valves!
    This executable file installs new pump performance curves that allows owners to compare a system design with and without pressure independent control valves.
    With this new modeling capability, engineers can:
    •    Compare the annual energy consumption of two models to estimate the savings achieved through pressure independent control valves.
    •    Calculate a reliable ROI for Pressure Independent Control Valves.
    •    Generate necessary documentation for LEED points achieved under Energy and Atmosphere Credit 1: Optimize Energy Performance.

    Credible Curves – the Key to a “Base Case” Comparison
    Belimo pressure dependent pump performance curves are installed in the standard Trane Trace™ 700 and eQuest performance curve libraries, so their operation is fully transparent and compatible with existing models.

    Belimo developed these curves through intense study and collaboration with leading experts in energy modeling and software engineering. They are based on actual, newly installed hydronic systems with conventional pressure dependent control valves. They are the key to the base comparison that engineers need to quantify and demonstrate the savings of pressure independent control valves.

    Full documentation of the development of the Belimo pressure dependent pump performance curves is included along with the plug-in to make your models easily defensible to the most demanding audience.

    Software is Free and Installs in Seconds!Belimo PIV Energy Modeling Plug-in
    The Belimo PIV Energy Modeling Plug-in for Trane Trace™ 700 and eQuest installs on your computer in seconds. Software management utilities are included to allow you to remove the software should you ever desire to.
    Computer Requirements:
    •    Microsoft Windows XP, Windows XP Professional, or Windows 7
    •    Trane Trace 700, Version 6.2.X and/or eQuest, Version 3.6X

    Tags: Online Learning Resources & Tools, Pressure Independent Valves, Green Building Technology, Belimo News, Technical Tips

    Recorded Webinar: New Tool for Simplifying Project Commissioning

    Posted on Mon,Aug 27, 2012 @ 10:00 AM

    Belimo Energy ValveBelimo Energy Valve™ - a new tool for simplifying project commissioning and verifying your HVAC design performance.

    On August 14, 2012 Belimo held an online webinar which covered new Belimo Energy Valve and how the valve not  only keeps owners and/or operators informed of coil performance but it has built-in Belimo Delta T Manager that helps operators analyze and fine tune performance under any and all conditions.

    The webinar covered how low Delta-T Syndrome is a common (and costly) problem in many large facilities, especially on sprawling campuses with central chilled water plants. Attendees learn how the new Belimo Energy Valve helps detect and address all of the following scenarios that commonly impact coil performance and thus system efficiency:

    • Coil degradation due to fouling and scale.
    • Improperly sized coils.
    • Poor valve authority results in under or overflow of the coil.
    • Changes made elsewhere in the system that frequently impact other circuits which are inherently interactive.

    Never before has one valve done so much - from providing superior water flow control to trending and diagnostics.

    This Webinar covered:

    • Advantages of PI Valves
    • Changes in Coil Performance
    • Constant Commissioning
    • Belimo Energy Valve

    Watch the complete webinar now.

    Download the Questions and Answers from the webinar.

    Tags: Online Learning Resources & Tools, Pressure Independent Valves, Green Building Technology, Belimo News