The IEFB Insertion Thermal Energy Meter by Dwyer Instruments Inc. is used for measuring fluid velocity and energy consumption in heating, ventilation and air-conditioning systems. It includes a flow sensor and two built-in temperature sensors to achieve these measurements.
The flow sensor uses electromagnetic technology and works on the principle of Faraday’s law, where a conductive liquid moving through a magnetic field produces a current proportional to the velocity of the liquid. Devoid of moving parts while inserted into the flow of liquid in a pipe, this allows the product years of trouble-free service without compromising on accuracy of flow measurement.
The two temperature sensors measure the supply and return water temperature, allowing the built-in temperature meter to calculate delta measurement in chiller and boiler applications. This temperature delta in combination with the flow measurement allows the built-in calculator to measure, understand and thus help optimize the heat energy performance in commercial and residential building applications.
Courtesy of Dwyer InstrumentsThe IEFB has a useful feature that allows it to be installed on an existing heating or cooling system without having to drain the pipe. This is achieved with the help of a hot tap fitting used in combination with a shutoff valve. Installers would first need to prep the pipe with a magnetic drill and install the shutoff valve. Once the hot tap is threaded onto the valve, the valve can be opened and the flow sensor can be introduced into the pipe, while the pipe is still full of liquid.
The hot tap feature proved useful to Baumer Technologies in India when they installed the flow meter on six existing chillers at the Phoenix Market City Mall in Mumbai. Spread across 4 million square feet, this mall includes 2 million square feet of retail space, 14 movie screens and 70 restaurants. Business never stops here.
Downtime for air-conditioning units in hot and humid Mumbai would mean loss of business for its tenants. Once the shutoff valve was in place, installation and commissioning of each sensor took less than 40 minutes per chiller.
This means that the businesses could continue working on the floors below, while the Baumer engineer, Soman George, completed the task in the plant room on the roof, with ease of installation.
Post installation, the heat energy optimization conducted on account of this installation immediately helped the mall save money on energy costs and bring about reduction of up to 15% on energy bills. While all six chillers would run during weekends and during peak load conditions, major savings were achieved by automatically switching off two chillers, and sometimes three, when foot traffic in the mall is much lower during the weekdays.
Dwyer’s IEFB Insertion Thermal Energy Meter not only delivers results post installation but also brings savings to its customers with its quick install mechanism, eliminating downtime during installation.