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    • Novi Zeland
    • SAR Makao, Kina
    • Singapur
    • Tajland
    • Tajvan, Kina
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  • Dobrodošli, {0} - Moj nalog

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Početak
  • Proizvodi

    Pokretači

    • Dimenzionisanje i izbor pokretača
    • Pokretači bez zaštitne funkcije
    • Pokretači sa zaštitnom funkcijom
    • Pokretači za ekstremne spoljašnje uslove
    • Brzi pokretači
    • Linearni pokretači
    • Pokretači požarnih klapni
    • Pokretači dimovodne klapne
    • Promenljiva zapremina vazduha
    • Pokretači ventila

    Ventili

    • Dimenzionisanje i izbor ventila
    • Belimo Energy Valve™
    • Regulacioni ventili nezavisni od pritiska
    • Zonski ventili
    • Loptasti regulacioni ventili
    • Loptasti ventili
    • Leptir ventili
    • Regulacioni ventili
    • Ventili za pitku vodu
    • Refrigeration Valves
    • Pokretači ventila

    Senzori / merila

    • Izbor senzora/merila
    • Kanalni senzori (vazduh)
    • Cevni senzori (voda)
    • Spoljašnji senzori (vazduh)
    • Sobne jedinice
    • Merila toplotne energije (TEM)
    • Belimo Energy Valve™ sa TEM

    Sistemi

    • Belimo Energy Valve™
    • Individualna rešenja
    • Bus sistem i sistemska integracija
    • Vatra i dim
    • Energetski razdelnik
    • Belimo ZoneEase™ VAV

    RetroFIT+

    • RetroFIT+ Product Replacement Tool
    • Povećajte potencijal svog sistema na maksimum
    • Nadogradite svoj sistem
    • Optimizovanje postojećih KGH sistema
    • RetroFIT+ Zamenski proizvodi
    • RetroFIT+ partneri

    Primene

    • Primene za hlađenje centara za podatke
    • Klima komore (AHU)
    • Prostorije i zonske primene
  • Podrška

    Usluge

    • Dimenzionisanje i izbor pokretača
    • Dimenzionisanje i izbor ventila
    • Izbor senzora/merila
    • RetroFIT+ Product Replacement Tool
    • Tender Texts
    • Proizvodi posebno prilagođeni potrebama klijenata
    • Centar za preuzimanje
    • Alat za podešavanje / Aplikacije
    • Softver / dodatne komponente / CAD
    • Arhiva datoteka (bus i sistemska integracija)
    • Katalog proizvoda i cena / Datanorm
    • Opšti uslovi prodaje i isporuke
    • Belimo Cloud: prijava/registracija
    • Aktivacija merila toplotne energije
    • Video-zapisi

    Belimo Education

    • Belimo Experience Centre (Beč, Austrija)
    • Belimo Experience Center (Hinvil, Švajcarska)
    • Belimo Experience Center (Großröhrsdorf, Germany)
    • Obilazak kompanije (Hinvil, Švicarska)
    • Vebinari
    • Obuka

    Primene

    • Primene za hlađenje centara za podatke
    • Klima komore (AHU)
    • Prostorije i zonske primene
  • O nama

    Belimo

    • Profil
    • Naše vrednosti
    • Održivost
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    • Ocenenia a uznania
    • Dobavljači
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    • Jobs
    • Culture@BELIMO
    • Benefits
    • Recruitment process
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    Navigation_Teaser_1

    Investor Relations

    • Key Figure Comparison
    • Reports and Presentations
    • Ad hoc and Corporate News
    • Belimo Share
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    • Annual General Meeting
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  • Kontaktirajte nas
  • Proizvod koji se više ne proizvodi
  • Stavke u fascikli za preuzimanje

    Fascikla za preuzimanje je prazna
    stavka(i) u fascikli za preuzimanje

    !

    Prikaži fasciklu za preuzimanje
    U centar za preuzimanje
  • Stavke u vašoj korpi

    Korpa je prazna.
    stavka(i) u korpi

    Solution

    Količina:
    Ukupno:
    Pregled korpe / liste projekata
    Otvori drugu listu projekata
    Izvezi kao .xlsx Izvezi kao .csv Uvezi iz .csv Uvezi iz .bel
air-handling-unit-header

Air Handling Unit (AHU)

  1. Početak
  2. Belimo Energy Valve™ i Merilo toplotne energije
  3. HVAC Applications

What is an Air Handling Unit (AHU)?

An air handler or air handling unit (AHU) is a machine used to condition and circulate air as part of a heating, ventilating, and air-conditioning system.

It usually contains

  • one or more fans,
  • heating and or cooling heat exchangers,
  • filter racks or chambers,
  • sound attenuators and
  • dampers.

Air handlers usually connect to a ductwork ventilation system that distributes the conditioned air through the building and returns it to the AHU. Water is delivered from the central plant to AHU, and is passed through a heat exchanger. This process is controlled by a DDC control loop which adjusts the water flow through the heat exchanger using a control valve, the valve is modulated by the DDC maintaining a desired temperature either in a space or leaving the AHU.

 

air-handling-unit-schematic


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Energy Valve
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Common issues in AHU applications

Many AHUs in the field suffer from poor performance, principally for the following reasons:

Part load

Dynamically changing water and air flow rates result in mismatches, and these lead to overflows and low delta T.

Coil performance

Coils degrade over time. Without proper maintenance, the coil output is reduced, leading to lower heat transfer.

Oversized valves

Pressure dependent valves that are oversized are most commonly selected using line size. This oversizing creates control instability by delivering large changes in water flow for small valve movements.

Pressure fluctuations

Differential pressure fluctuations substantially impact the flow rate through the coil.

Why you should choose the Belimo Energy Valve™ in an AHU application

Loads in the buildings often change dramatically based on the season, and even throughout the day. However, static balancing is undertaken based on worst case ‘design loads’. As buildings rarely experience 'design load', DDC controls have to continually adapt the water flow through the heat exchanger, depending on the actual demand. These continuous adaptations create pressure changes for the other heat exchangers in the same hydronic circuit and negatively influence their flow rates.
Reciprocal influence of several consumers in a hydronic system can be completely eliminated with the dynamic balancing function of the EV. Changes in differential pressure do not cause any changes in the rate of flow.


AHUs typically control air volume based on duct static pressure, and water flow rates using outlet air temperatures. As the relationship between valve position and air volume is not fixed, the dynamic nature of the control means that the air volume is regularly mismatched to the water flow. This often results in overflows, which we know as low delta T syndrome.

If a heating or cooling system is operated with excess water flow, this cannot be converted into higher heating or cooling power. In this case, the temperature spread between supply and return decreases. The resulting low delta T syndrome is a clear indicator that the pumps are working harder than they need to, and central plant capacity is compromised.

Low Delta T Syndrome
The Delta T Manager, integrated in the Belimo Energy Valve™, is a function that continuously measures the temperature spread and compares it with the system-specific limiting value. If it falls below this, the Belimo Energy Valve™ automatically adjusts the flow so that only the amount of water actually needed to achieve the desired power is used. As a result, the integrated logic prevents the occurrence of low delta T syndrome and ensures maximum comfort with the lowest possible energy consumption.

Delta T Manager

Benefits of the Belimo Energy Valve™

Dynamic balancing by the Belimo Energy Valve™ ensures the correct amount of water at full and partial load.

  • Reciprocal influence between valves is eliminated due to the dynamic balancing.
  • Power control delivers identical heating or cooling output for any given input.
  • The monitoring capabilities of the EV provides full system transparency (volumetric flow, temperatures, and cooling/ heating output) with data recording and optional archiving to the Belimo Cloud.
  • Constant pump optimisation is possible using the physical valve position
delta-t-manager

Solving low delta T syndrome for better energy efficiency

Success Story: Belimo Energy Valve™ at Land O'Lakes, Inc., Minnesota

Belimo Energy Valve Plays Integral Role in Land O' Lakes, Inc.' s Corporate Facility Upgrade

Land O' Lakes, Inc.' s Corporate Sustainability Group began making plans to upgrade the facilities in order to increase efficiency and reduce energy consumption. HVAC systems were a particular area of focus due to the fact that as the buildings aged, they became more difficult to cool and meet desired discharge air temperature set points (especially in the summer months). Improving occupant comfort was also a priority.

After conducting a thorough review of piping, valves, and instrumentation, officials concluded that in order to solve the problem, various infrastructural improvements would have to be made. They then began the process of searching for a solution, which eventually led them to the Belimo Energy Valve™.

  • Success Story - Land O'Lakes, USA
  • Infographic - Land O'Lakes, USA
landolakes

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More about the Belimo Energy Valve™

  • More information

The Belimo Energy Valve™ in other HVAC Applications

  • Read more

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