Solar Radiation Shields Overview

Dr. Bruce Bugbee, of Apogee Instruments, discusses solar radiation shields, and how to protect your sensors from solar radiation to get more accurate air temperature and humidity measurements. In the video he covers the design of the Apogee Instruments TS-100 Fan-aspirated Radiation Shield and performance data from test locations that compares the TS-100 to multi-plate shields and other aspirated radiation shield.

VIDEO CONTENT

01:27 Multi-plate Shield-The first shield covered, is the one everyone is most familiar with called a multi-plate, passive, or static shield. These shields have no moving parts and rely on the wind to cool them. The wind passes through the plates while the shield shades the sensors from the Sun.

02:44 Met One Shield- The second is the Met One shield, which is a long tube. The inlet for the air is in the bottom and the air flows through it and comes out the top.

03:00 RM Young Shield- The third is the RM Young shield. It has air coming in the bottom that flows through it and again comes out the top.

03:17 Apogee Fan-aspirated Shield- Finally we talk about Apogee’s fan-aspirated shield. It too, pulls air in from the bottom and pushes it out of the top of the shield.

03:38 The TS-100 has now been tested in many locations against the previously named shields.

03:40 First test site, is at Campbell Scientific in Logan, UT. This test site had multiple replicates of different multi-plate shield, the TS-100, and the RM Young Shield.

04:25 Second test site, is the Apogee backyard in Logan, UT. This is a more extensive test with replica TS-100 shields, RM Young shield, and Met One shields.

04:55 Third test site, is at Campbell Scientific England. This site is has the RM Young, TS-100, and a whole bunch of static shields.

05:15 Fourth test site, is the Utah State University campus environmental observatory. This is a solar-powered station and has a static shield along with the TS-100.

05:59 Data from test sites is gone over in detail.

11:59 Design of Apogee TS-100 Fan-aspirated Shield-One of the design goals of the Apogee shield was to dramatically reduce the power needed to run the shield so that it can be run from a solar panel. To do this Apogee made a more efficient design. The inside of the shield is filled with foam for insulation. The sensors are inserted through a sensors port that uses adaptors to fill the port and fit the sensors. The shield has a coanda inlet, it looks a lot like a jet engine inlet, when the wind is blowing sideways the inlet can easily change its direction to flow upward. The air is blown up through the shield, through the fan, and blows out the top of the shield.

13:32 Apogee’s fan in the TS-100-The fan in the shield has an IP55 rating that makes it resistant to dust and water to make it rugged in the field. The fan is low enough power that it can be operated from a small solar panel.

16:43 TS-100 Sensor Port and Adaptors-We found the best way to put the sensors in the shield is to slide them into the sensor port. It is a simple and elegant design that allows you to take out the sensors and change them as needed. The sensors are placed in a port adaptor that goes inside the port. These adaptors have a nice fit to the sensors and the port that seals of the port and allows air to flow through the shield as designed. We have multiple sensor port adaptors for temperature and humidity sensors, you can find a list of the sensors we already have adaptors for at http://www.apogeeinstruments.com/content/ts100sensorportadapter.pdf if we do not already have your sensor listed contact technical support for adaptor options.

19:30 Case Studies using the TS-100. I-Utah project, for extreme weather conditions, and greenhouse application.

More information at http://www.apogeeinstruments.com/aspirated-radiation-shield/ and http://www.apogeeinstruments.com/radiation-shield-support/.

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More videos on the air temperature and humidity measurements and solar radiation shields can be found at https://www.youtube.com/watch?v=G9xdVQii_YY&list=PLOTpNTsJcpqeJEyiYVeIGAECR043DW1rY.

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Видео Solar Radiation Shields Overview канала Apogee Instruments Inc.