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Flujo de los ramales y control del diferencial de temperatura

Sistema de flujo de ramales

Los sistemas distribuidos de gran tamaño, ya sea un edificio o como parte de un sistema de distrito, necesitan un diferencial de temperatura óptimo para funcionar de forma efectiva.

El uso de la Energy Valve en todas las unidades puede no siempre resultar práctico, y la instalación de las Energy Valve en los ramales principales o a la entrada de los edificios en distritos térmicos no resulta aconsejable, puesto que puede que el administrador de delta T suprima la alimentación a unidades individuales al mismo tiempo que intenta administrar el edificio completo.

Esquema

El sistema mostrado en la imagen, en el que se usan Belimo Energy Valves™, ofrece las siguientes funciones ventajosas:

  • Se monitorea el flujo hacia el ramal, que además puede ajustarse para evitar un exceso de flujo en el piso y para monitorear también el diferencial de temperatura
  • Se monitorea el consumo de energía en cada ramal. Este se puede registrar y se puede activar una alarma si la demanda de alguno de los ramales aumenta drásticamente
  • Ahora es posible verificar el flujo que atraviesa cada terminal mediante el uso del medidor de flujo acoplado a la Energy Valve, abriéndolas una a la vez. El cierre de todas las válvulas confirmará si las válvulas permiten el paso de agua estando cerradas, o si hay una válvula de bypass abierta
  • Transparencia total del ramal (flujo volumétrico, temperaturas, salida de frío/calor, etc.) mediante el registro de datos y la conexión a la Nube de Belimo

 



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Learn how the Energy Valve improves your branch flow





Energy Valve



Problemas comunes en ramales de unidad terminal y cómo los aborda la Belimo Energy Valve™

Larger buildings have complex distribution systems and are occupied, meaning that the retrofit of an Energy Valve on each terminal is impractical. However, lack of capacity at peak times or fines from district plant providers often drive building owners to look for a solution. The figure below shows a pressure dependent system with a single balancing valve. This is a typical contract installation of multiple low flow heating units, for example, used for underfloor heating.



Mechanical balancing valves only allow for a static balancing of the total flow to the floor, with unknown flow rates to each individual unit
This can be remedied by retrofitting Belimo Energy Valves™ to every branch. Monitoring the flow and delta T being supplied to a number of terminal units allows facilities teams to identify problem ‘passing units’ and bypasses left open. This focus improves efficiency quickly by offering a targeted approach to overcoming the issues being experienced. This involves replacing passing or stuck terminal valves with 'air bubble tight' zone valves, or closing a bypass valve that has been inadvertently left open.


Our need to operate more efficient buildings, drives the demand to check water flow rates not just once but multiple times during each season. Experience tells us tenant fit outs or changes to hydronic system adversely effect non-PI installations. However, even with PI valves installed, checking the identifying passing valves and open bypasses should remain a priority to keep delta T to an acceptable range.

By using an EV in the branch line, we are able to measure the total flow to the floor and also to each individual unit, if opened sequentially



With an EV, the branch flow can be measured when each valve is opened, allowing for verification


Ghost energy/passing/leakage is typically used to describe the process where water is unintentionally passing from the flow side to the return. A bypass is left open after maintenance or at axial valve leakage rates. These small rates quickly add up when a large number of them are applied. The rate at which these valves pass or leak is made worse over time by the accumulation of dirt on the seats of the valves.



An accidentally open bypass valve may not be discovered for weeks, months or even years

By using an EV in the branch line, we are able to measure the total flow to the floor and to each individual unit. You can ensure bypasses are closed and valves are not leaking. Should a number of terminal valves suffer from leakage, the characterised ball valve technology in the EV can be closed, hence providing a stop to the wastage when the branch is not in use.



With an EV, both leaking short-stroke valves or an open bypass can be clearly identified


Often, terminal units are statically balanced, which leads them to overflow and deliver low delta T when in part load. Valves may be allowing water past them when they should be closed. Sometimes, even a bypass left open can stay undetected, reducing the pressure and dragging the delta T down.



Low delta T syndrome

The Delta T Manager, integrated in the Belimo Energy Valve™, is a function that continuously measures the temperature spread. This information can either be used to raise an alarm while you are troubleshooting the branch, looking for passing/leaking valves or bypasses left open. Once the branch is performing as well as it can, you can enable Delta T Manager to limit overflows to the branch.



Delta T Manager

Historia de éxito: Hospital Ludmillenstift en Meppen/Alemania

La Energy Valve inteligente soluciona problemas hidráulicos persistentes

El hospital Ludmillenstift de Meppen (Alemania) es conocido más allá de la zona local por su estándar de atención médica, su tecnología diagnóstica y terapéutica de vanguardia así como su ambiente acogedor. Sin embargo, un gran número de modernizaciones a lo largo de los años, en forma de ampliaciones o modificaciones, dieron lugar a problemas en los circuitos de distribución hidrónica del hospital. Éstos se han rectificado finalmente con el uso de Energy Valves™ de Belimo.