Regents Hall Environmental Monitoring Metadata & Help
Equipment/programming issues resulted in loss of data to database 2/25/10-3/16/10 and 6/1/10-9/1/10, 11/7-16/10, 12/10-28/10, 3/5-14/11 but these data are available upon request.
* Water Depth: Campbell Scientific SR50A Sonic Ranging Sensor. Distance to water or snow/ice surface given in cm. Sensor was knocked out 7/26/11 by lightning and repaired and replaced 9/21/11. Distance to water now ~50cm greater because of addition of new segment to support pole to try to avoid submergance of sensor during intense rain events. Excavation of pond resulted in damage to cable and no/intermittent data from 10/21/12 - 11/20/12.
* Conductivity and Water Temperature: Campbell Scientific CS547A. Calibrated range for conductivity meter is ~0.005 to 7.0 mS/cm. Water temperature units are degrees celsius.
* New conductivity/water temperature installed 03/13/12 at 12:50. This was to resolve problem with temperatures reading too high that likely developed 09/01/10 based on anomalous 200+ C temperature recorded by probe for 9/1 - 9/29 of 2010. Conductivity did not change with installation of new probe. Temperature dropped from 20.182 to 6.796 C (change of 13.447) with change in probe.
* Air Temperature: Campbell Scientific 107. Unit is in a housing on same pole with SR50A-L and reported in degrees celsius. Problem with sensor probably develloped 09/01/10 based on anomalous readings of +200C on that date through to 09/29/10. the best guess is that temperatures have been
- Pond data collection begins 12/14/2009.
- Water temp and air temp data for 9/2/10-10/1/10 are bad (values available are wrong). They are available on request.
* Barometric Pressure: Campbell Scientific CS100. Units are mm of Hg with exception of 8/16 - 8/26 when pressure was recorded as millibars.
* Net Radiation, Net Longwave Radiation, Net Shortwave Radiation: Campbell Scientific CNR2 Net Radiometer. Units are Watts/m^2. Negative values indicate more radiation coming up from surface below sensor than incoming from sun. Shortwave is defined as 310 to 2800 nm and longwave 4.5 to 42 μm. The greenroof sensor is over area dominated by vegetated trays and reflective roof sensor is over small roof on top of cold storage area. Note that mounting pole for wind sensors casts a brief shadow on reflective roof radiometer daily. The radiation sensors are mounted 1.5 meters above the adjacent surfaces
* Total Incoming Radiation: Campbell Scientific CS300. Units are Watts/m^2. Sensor is on same mounting pole as green roof net radiometer and is sensitve to spectral range of 300 to 1100 nm. The sensor is mounted 1.5 meters above the adjacent surface.
* Tray Temperatures: Campbell Scientific 107 sensors. Units are paired in two different green roof trays. Surface temperature is measured with probe inserted ~3 cm into surface of planting media and under tray measurement is based on laying probe flat under tray. Temperature is reported in degrees celsius. NOTE: TRAY 2 SURFACE TEMP HAS BEEN RUNNING HIGH. TEMP SENSOR HAD BEEN PULLED FROM TRAY AND LEFT TO LAY ON GROUND. Was put back in planting medium 08/12/11.
* Precipitation: Campbell Scientific 385 heated rain gauge. Precipitation is measured as total mm per 15 minute summary period. Totals before August 15 are duplicated (e.g. two readings where there should be one) and so sum totals for any period prior to this date should be divided by two. In the CURRENT CONDITIONS, precipitation is given as sum total over past 24 hours. Precip data for 6/21/11-6/22/11 (3:00 PM missing due to problem with sensor).
* Relative humidity and air temperature: Campbell Scientific HMP50. One unit is located over green roof and the other unit is located near reflective roof. Temperature is recorded in degrees celsius and RH as %. Distance between the physical surface of the trays and green roof sensor is 1m. The distance of the reflective roof sensor to the adjacent roof is 1.5 meters and 4.5 meters to the pavers of accessible roof below.
* Wind speed and Direction: Campbell Wind Sentry 03002. Wind speed is recorded as m/s and is average over 1 hr. Direction is given as azimuthal direction (0=N, 90=E, 180=S, 270=W) and also recorded as an hourly average.
* The borehole is monitored with thermistors (Omega, TSTH 44033). Temperature is monitored in degress celsius.
- We continue to have problems with faulting/bad connections with the 0.1 and 4 m thermistors which results in extreme temperature variation and often very negative numbers departures. Caution/editing out of these extreme values is recommended.
- Unil May 17, 2010 the thermistors are only recording temperature in integer values.
- I added (3/14/11)perlite as an insulating material in the upper 0.5m of conduit (held in place by foam) to provide better insulation and cut down on convective heat transfer. The 0.1m thermistor was reading -3.58 C at that time. A glass thermometer stuck into soil 0.1m adjacent to borehole read 3 C at same time. After 1.5 hr (sunny day,) the temp of upper thermistor was -2.42 vs -3.58 prior to adding insulation.
Building Energy Demand
* Electrical demand is given as kwh and we are reporting sum kwh for a 15 minute period. Demand is given for lighting, receptacles, and mechanical systems. The sum of these three gives total electrical use. Enercep meters are being used for data capture
- Mechanical = Total- light-receptacle
- There is an unexplained off-set (as of 10/20/10) in lighting numbers of 4-5 kwh on an alternating month basis. This should be removed prior to analysis.
* Steam is being recorded with a meter on the main inlet to building. A meter records steam use in minimum units of 100 lbs/hr and data are recorded as the number of times the meter advances during a 15 minute period. e.g. two clicks = 200 lbs/hr, etc. CURRENT READINGS for steam is simply the sum use over past 1 hr. 1 lb of steam = 1000 BTUs. 1 BTU = 0.000293 kwh
* Chilled Water is being recorded in units of tons/hr. Again data are recorded over a 15 minute period. Current Readings for chilled water is simply the sum of readings over past 1 hr.
1 ton/hr = 12,000 BTUs. 1 BTU = 0.000293 kwh.
Questions, Comments can be addressed to Charles Umbanhowar Jr (ceumb at stolaf.edu)