BARANI DESIGN MeteoHelix® IoT weather stations for smart street lamps

Urban street lamp weather stations like the MeteoHelix IoT Pro are able to produce research quality climate change data even in urban environments dominated by pavement and sun Heated walls.

Smart street lamp weather stations like the MeteoHelix® IoT Pro are able to produce research quality climate change data even in urban environments dominated by pavement and sun-baked walls.

Installations on lamp posts are ideal as they put distance between weather stations and sun-heated walls of buildings so that weather stations can do their job properly. While urban weather stations equipped with a helical MeteoShield® Professional are able to accurately measure air temperature even in direct sunlight with accompanying sun reflections and radiating heat sources, care must still be taken to choose an installation location representative of the environmental factors which one wants to measure.

Care must be taken to install urban weather stations such that artificially heated air does not feed directly into them. This will result in the measurements being dominated by hyper-local meteorological phenomenon. If one wants to measure the extremes of urban heat island effects, this will be acceptable, but if the goal is to quantify the urban climate over a larger area, lamp post and street light installations are an ideal choice.

The accompanying photos show a street lighting installation of a BARANI DESIGN Technologies MeteoHelix IoT Pro and SEB50 rain gauge within an urban building complex.

MeteoHelix Weather station installed on street lightning in a downtown park in the city of Bratislava.

MeteoHelix Weather station installed on street lightning in a downtown park in the city of Bratislava.

Energy efficient LED street lamp with a MeteoHelix weather station.

BARANI DESIGN TECHNOLOGIES IS A MANUFACTURER OF PROFESSIONAL WEATHER STATIONS AND METEOHELIX PERSONAL WEATHER STATIONS.

BARANI DESIGN TECHNOLOGIES IS A MANUFACTURER OF PROFESSIONAL WEATHER STATIONS AND METEOHELIX PERSONAL WEATHER STATIONS.

 

Quantifying benefits of green roofs becomes easier with the latest technological breakthroughs

Comenius University research on the real climatological benefits of green roofs in inner-cities is supported by BARANI DESIGN Technologies’ educational discounts.

Green-roofs are here to stay. Their benefits in the reduction of the heat-island effect are known, yet not well quantified. The limitations of current sensor and weather station technologies limit the quality of urban climate research due to error producing influences of sun-heated building walls and pavement. Large measurement errors in meteorological instrumentation due to inadequate 360-degree solar heat shielding with adequate ventilation severely limit urban meteorological data quality. Yet one sensor company is about to change that.

The application of helical MeteoShield® Professional technology as part of the MeteoHelix IoT Pro micro-weather stations is enabling researchers to achieve WMO precision in air temperature measurement in inner-cities. The multiple degree errors of conventional multi-plate radiation shields and their fan-aspirated solar shield counterparts are a thing of the past with the application of BARANI DESIGN’s helical shielding technology which has been verified by the World Meteorological Organization (WMO).

As part of its educational support program, BARANI DESIGN Technologies provides deep discounts on meteorological sensor technologies to educational institutions and researchers like Assoc. Prof. Dr. Eva Pauditšová , PhD. from Comenius University in Bratislava, who is performing research on the real climatological benefits of green roofs in inner-cities in cooperation with Chief Architect Ing. arch. Ingrid Konrad (Bratislava City Hall) and the support of the city of Bratislava magistrate.

“Thanks to the technology found in the MeteoHelix IoT Pro micro-weather stations we are finally able to accurately determine the cooling effect of green areas in the city,” says Assoc. Prof. Dr. Eva Pauditšová , PhD. who’s research builds on the successful international project Horizon 2020 RESIN - Climate Resilient Cities and Infrastructures. Her current focus is on the sensitivity of urban structures and microclimates to the effects of large scale climatic changes due to global warming and is part of the international project Horizon 2020 ARCH – Advancing Resilience of Historic Areas against Climate-related and other Hazards.

BARANI DESIGN Technologies MeteoHelix® weather station on a lamp post as part of international Horizon 2020 ARCH urban climate research. Bratislava, Gajova.

MeteoHelix® weather station monitoring microclimate in Bratislava’s Horsky Park as part of the Horizon 2020 ARCH urban climate research project.

MeteoHelix® weather station enabling new levels of precision in urban climate research in Bratislava, Raca as part of Horizon 2020 ARCH.

MeteoHelix® weather station enabling new levels of precision in urban climate research in Bratislava, Raca as part of Horizon 2020 ARCH.

BARANI DESIGN TECHNOLOGIES IS A MANUFACTURER OF PROFESSIONAL WEATHER STATIONS AND METEOHELIX PERSONAL WEATHER STATIONS.

BARANI DESIGN TECHNOLOGIES IS A MANUFACTURER OF PROFESSIONAL WEATHER STATIONS AND METEOHELIX PERSONAL WEATHER STATIONS.

HMP155 & Sensor Response Time effect on Measurement Error

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Its worth noting that the temperature time constant listed for the HMP155 is at a hefty 3 m/s airflow speed as shown in the photo from its manual. Thus the HMP155 temperature time constant converted to still air will, unfortunately, be significantly higher and hence the HMP155 temperature measurement error due to fluctuating air temperature will NOT be per WMO recommended guidelines as specified in the WMO – The CIMO Guide – Guide to Meteorological Instruments and Methods of Observation, 2014 Edition updated in 2017.

Due to the slow time response of this temperature sensor, an air temperature fluctuation of 2 °C over a period of 2 minutes in 3 m/s airflow will show a measurement error of 0.29 °C (at 3 m/s air speed) on top of the basic sensor accuracy/uncertainty.

Flow obstruction caused by a radiation shield will significantly increase this error for low wind speeds. Despite the status quo, it will be very hard to justify the HMP155’s use for precision climatic measurement. In 1 m/s air, the time constant can rise to 35 seconds and in 0.5 m/s air to 49 seconds, thus producing errors over 0.5 °C due to only the sensor’s slow response time.