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Title: Significant Improvements in Pyranometer Nighttime Offsets Using High-Flow DC Ventilation

Abstract

Ventilators are used to keep the domes of pyranometers clean and dry, but they affect the nighttime offset as well. This paper examines different ventilation strategies. For the several commercial single-black-detector pyranometers with ventilators examined here, high flow rate (50 CFM and higher), 12 VDC fans lower the offsets, lower the scatter, and improve the predictability of the offsets during the night compared with lower flow rate 35 CFM, 120 VAC fans operated in the same ventilator housings. Black-and-white pyranometers sometimes show improvement with DC ventilation, but in some cases DC ventilation makes the offsets slightly worse. Since the offsets for these black-and-white pyranometers are always small, usually no more than 1 Wm -2, whether AC or DC ventilated, changing their ventilation to higher CFM DC ventilation is not imperative. Future work should include all major manufacturers of pyranometers and unventilated, as well as, ventilated pyranometers. Lastly, an important outcome of future research will be to clarify under what circumstances nighttime data can be used to predict daytime offsets.

Authors:
 [1];  [2];  [1]
  1. Univ. of Colorado, Boulder, CO (United States); NOAA/Earth System Research Lab., Boulder, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
OSTI Identifier:
1364678
Alternate Identifier(s):
OSTI ID: 1369124
Report Number(s):
NREL/JA-5D00-67398
Journal ID: ISSN 0739-0572
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article: Published Article
Journal Name:
Journal of Atmospheric and Oceanic Technology
Additional Journal Information:
Journal Volume: 34; Journal Issue: 6; Journal ID: ISSN 0739-0572
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 47 OTHER INSTRUMENTATION; pyranometer; offsets; climate records; data processing; in situ atmospheric observations; instrumentation/sensors; quality assurance/control; surface observations

Citation Formats

Michalsky, Joseph J., Kutchenreiter, Mark, and Long, Charles N.. Significant Improvements in Pyranometer Nighttime Offsets Using High-Flow DC Ventilation. United States: N. p., 2017. Web. doi:10.1175/JTECH-D-16-0224.1.
Michalsky, Joseph J., Kutchenreiter, Mark, & Long, Charles N.. Significant Improvements in Pyranometer Nighttime Offsets Using High-Flow DC Ventilation. United States. doi:10.1175/JTECH-D-16-0224.1.
Michalsky, Joseph J., Kutchenreiter, Mark, and Long, Charles N.. Tue . "Significant Improvements in Pyranometer Nighttime Offsets Using High-Flow DC Ventilation". United States. doi:10.1175/JTECH-D-16-0224.1.
@article{osti_1364678,
title = {Significant Improvements in Pyranometer Nighttime Offsets Using High-Flow DC Ventilation},
author = {Michalsky, Joseph J. and Kutchenreiter, Mark and Long, Charles N.},
abstractNote = {Ventilators are used to keep the domes of pyranometers clean and dry, but they affect the nighttime offset as well. This paper examines different ventilation strategies. For the several commercial single-black-detector pyranometers with ventilators examined here, high flow rate (50 CFM and higher), 12 VDC fans lower the offsets, lower the scatter, and improve the predictability of the offsets during the night compared with lower flow rate 35 CFM, 120 VAC fans operated in the same ventilator housings. Black-and-white pyranometers sometimes show improvement with DC ventilation, but in some cases DC ventilation makes the offsets slightly worse. Since the offsets for these black-and-white pyranometers are always small, usually no more than 1 Wm-2, whether AC or DC ventilated, changing their ventilation to higher CFM DC ventilation is not imperative. Future work should include all major manufacturers of pyranometers and unventilated, as well as, ventilated pyranometers. Lastly, an important outcome of future research will be to clarify under what circumstances nighttime data can be used to predict daytime offsets.},
doi = {10.1175/JTECH-D-16-0224.1},
journal = {Journal of Atmospheric and Oceanic Technology},
number = 6,
volume = 34,
place = {United States},
year = {Tue Jun 20 00:00:00 EDT 2017},
month = {Tue Jun 20 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1175/JTECH-D-16-0224.1

Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

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