IPC-XI Tutorial Pyrgeometer

1 / 21

# IPC-XI Tutorial Pyrgeometer - PowerPoint PPT Presentation

IPC-XI Tutorial Pyrgeometer. Contents. Pyrgeometer energy balance Equations for retrieving longwave irradiance Shaded versus unshaded pyrgeometers. Pyrgeometer setup. Pyrgeometer energy balance. Kipp&amp;Zonen CG4. Eppley PIR. 5µm. 20µm. 40µm. Pyrgeometer energy balance. Kipp&amp;Zonen CG4.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about ' IPC-XI Tutorial Pyrgeometer' - alize

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### IPC-XITutorial Pyrgeometer

Contents
• Pyrgeometer energy balance
• Equations for retrieving longwave irradiance
Pyrgeometer energy balance

Kipp&Zonen CG4

Eppley PIR

5µm

20µm

40µm

Pyrgeometer energy balance

Kipp&Zonen CG4

Typical values:

Net outgoing radiation ~ 100 Wm-2

PIR Dome (∆T=1K) ~18 Wm-2

Eppley PIR

Pyrgeometer equations
• Several choices for the radiometric model of a pyrgeometer:

Simple Albrecht formula

Extended Albrecht (PMOD)

NREL formula

Fit parameters

1 Dome YSI

NIGHT

NIGHT andDAY

NIGHT

1 Dome YSI

1 Dome YSI

Proxy: Dome-body temperature

Dome proxy

Direct irr proxy

Dome proxy

Direct irr proxy

R=0.81

Effect is 6 W/m2 per 1kW

for this particular pyrgeometer

R=0.91

26955 3 dome

Effect is 5.5 W/m2 per 1kW

for this particular pyrgeometer

cg4

Is there shortwave leakage in the solar blind filters?

IPC-XI Pyrgeometer intercomparison

PIR & CG4

Difference to WISG / Wm-2