Greater efficiency for gas condensing heating systems

category: Heating Systems

date: 2021-09-20

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How a multifunction sensor from Allengra helps to precisely determine the efficiency of gas heating systems and making them eligible for energy efficiency funds.
In the last ten years, ultrasonic flow sensors have become more and more popular in gas heating systems. The advantages are obvious: Since they measure without mechanical counters, they are not susceptible to wear and tear and the precision of the measurement is retained until the end of their service life. They have a very low pressure loss and thus reduce the energy consumption of the circulation pump. In addition, they are now very attractively priced.
In cooperation with a manufacturer specializing in burners, heating systems, heat pumps and water heaters, Allengra developed a new multifunction sensor that helps to precisely determine the efficiency of the systems and turns them into eligible heat generators with digital balancing and measurement technology according to the new German federal funding for efficient buildings (BEG).

Allengra's development work creates market advantages
The medium-sized manufacturer of gas heating systems operates its own research and development center with highly specialized technicians, designers and engineers. Together with the Allengra team, they developed a high-performance device that integrates multiple sensors into an affordable and ultra-compact device that requires no maintenance and can be easily integrated into their systems. Allengra's development work gave the company a head start over its competitors.

Multifunction sensor provides essential parameters for greater efficiency
Gas condensing boilers, which run continuously in condensing mode, consume less gas than comparable systems on the market, with 15% higher efficiency. Thanks to the provision of essential measured values by the volume flow sensor, the controls of condensing boilers can maintain permanent condensing operation and achieve a higher level of efficiency.
The multifunction sensor developed and produced by Allengra is a compact heat meter that went into pilot production in mid-2015. The finished multifunction sensor with integrated ultrasonic flow measurement, two temperature sensors for flow and return as well as pressure measurement, has been manufactured by Allengra in its own factory in Oradea, Romania, for five years and delivered to its customers in series.

Fast and reliable data transmission
Since ultrasonic flow sensors measure without mechanical counters or moving parts, they can also reduce pressure losses and significantly increase the efficiency of a heat generator. A complex self-diagnosis system in the sensor reliably detects air bubbles in the heating circuit, which can reduce the efficiency of the system and decrease the noise level. All the data recorded by the sensor is made available to the heater control in an uncomplicated manner via a bus interface. If necessary, it also provides the service technician with relevant values so that they can intervene effectively.

Easy integration with just one connection
The sensor is integrated directly into the burner/heat exchanger block as a probe, sealed with an O-ring and fixed with just two screws. The simple installation requires no mechanical-hydraulic connections and the sensor itself has no hydraulic housing.
The two temperature sensors are positioned in the flow and return and measure the temperature difference (ΔT) between these two points with great precision. By combining ΔT with the volume flow – measured thanks to the integrated ultrasonic sensor – the instantaneous and cumulative thermal energy (amount of heat) is determined. The sensor is only connected to the controller of the heater by a simple cable connection.

Heat generators eligible for subsidies thanks to Allengra measurement technology
Since July 1, 2021, the German Reconstruction Loan Corporation (KfW) has been using the federal grant for efficient buildings (BEG) to support owners of residential and non-residential buildings in digitalization measures to improve the energy balance during construction and renovation. Measures in these areas will be rewarded with higher funding in the future. KfW board member Dr. Ingrid Hengster, who is responsible for the domestic funding business, says: "The potential for CO2 savings in the building sector is enormous, especially if the opportunities of digitization and renewable energies are also used."
From January 1st, 2023, the overall efficiency of an eligible heat generator must be recorded using measurement technology . Manufacturers of gas condensing boilers can equip themselves for this time with the combined flow sensor and heat meter from Allengra and ensure that their systems fall within the eligible measures for the digitization and sustainability of heating systems in new buildings and renovated buildings, thereby also creating advantages for homeowners.

Publications in specialist media:

1.More efficiency for gas condensing boilers [20.09.2021]
2.More efficiency for gas condensing boilers [10.11.2021]
3.More efficiency for gas condensing boilers [01.03.2022]