Clear Sky Calculator

Clear Sky Calculator

ธุรกิจ | Apogee Instruments

เล่นบน PC ผ่าน BlueStacks - Android Gaming Platform ที่ได้รับความไว้วางใจจากเกมเมอร์ 500 ล้านคนทั่วโลก

Page Modified on: 22 มีนาคม 2562

Play Clear Sky Calculator on PC

The Clear Sky Calculator is used to determine the need for recalibration of radiation sensors. It is most accurate when used near solar noon in the summer months. The calculator estimates the intensity of solar radiation (either total global shortwave radiation, measured by pyranometers, or global photosynthetic photon flux density, measured by quantum sensors) incident on a horizontal surface at any time of the day, at any location in the world. The equations used to estimate clear sky solar radiation with the Clear Sky Calculator come from the clear sky solar radiation model used to calculate net radiation in the ASCE Standardized Reference Evapotranspiration Equation (http://www.kimberly.uidaho.edu/water/asceewri/index.html). The only input requirements to the calculator are site elevation, latitude, longitude, reference longitude, and air temperature and relative humidity measurements or estimates. These data are typically easy to obtain, making the Clear Sky Calculator a simple solar radiation reference that can be used to estimate pyranometer and quantum sensor accuracy and determine the need for recalibration.

When used near solar noon over multiple clear, unpolluted days during spring and summer months, accuracy of the Clear Sky Calculator is estimated to be ± 4 % in all climates and locations around the world. As an example, modeled incoming shortwave radiation (SWi) from the Clear Sky Calculator closely tracked measured SWi (data from a heated and ventilated Kipp & Zonen CM21 pyranometer) for a clear day (April 21, 2012) in Logan, Utah. The ratio of measured SWi to modeled SWi was between 1.00 and 1.05 (0 % and 5 %) from 9 AM to 6 PM (solar zenith angles less than 65°). The average ratio from two hours before solar noon to two hours after solar noon was 1.02 ± 0.01 (2 ± 1 %). (see http://www.apogeeinstruments.com/using-the-clear-sky-calculator/ )

A more detailed discussion of Clear Sky Calculator accuracy is given on the webpage (http://clearskycalculator.com/model_accuracy.htm), where the necessary accuracy of the required inputs is discussed.

Apogee strongly encourages our customers to use the Clear Sky Calculator as an effective way to monitor pyranometer and quantum sensor performance and determine the need for sensor recalibration. If a sensor is consistently different from the Clear Sky Calculator by more than a few percent, please contact us about recalibration.

เล่น Clear Sky Calculator บน PC ได้ง่ายกว่า

  • ดาวน์โหลดและติดตั้ง BlueStacks บน PC ของคุณ

  • ลงชื่อเข้าใช้แอคเคาท์ Google เพื่อเข้าสู่ Play Store หรือทำในภายหลัง

  • ค้นหา Clear Sky Calculator ในช่องค้นหาด้านขวาบนของโปรแกรม

  • คลิกเพื่อติดตั้ง Clear Sky Calculator จากผลการค้นหา

  • ลงชื่อเข้าใช้บัญชี Google Account (หากยังไม่ได้ทำในขั้นที่ 2) เพื่อติดตั้ง Clear Sky Calculator

  • คลิกที่ไอคอน Clear Sky Calculator ในหน้าจอเพื่อเริ่มเล่น

ดูวิดีโอ