Whr Figures, From various sources |
Whr Figures, From various sources |
Feb 6 2006, 03:39 PM
Post
#1
|
|
Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
I've been looking at the new entries at the PDS for WHR quotes, to compile as good a list of actual quoted Whr values as I can......so if you find one, add it to this thread and I'll update this post with figures....any source as long as it's an actual figure and an actual sol.
B0515 - 418 Whrs B0522 - 462 Whrs |
|
|
Jul 20 2006, 02:37 AM
Post
#2
|
|
Senior Member Group: Moderator Posts: 2262 Joined: 9-February 04 From: Melbourne - Oz Member No.: 16 |
Helvick.
One thing that struck me last night. The amount of incident sunlight absorbed by dust on the panels must be quite inclination dependent. (Think of the size of the shadow of a dust grain, or the path length through a thin dust film as the the angle varies) Maybe this is the reason for the power falling off faster than expected? If this is the case then as we appoach the solstice the rate of change of this effect should decrease and even better, give more power than expected as spring arrives. Does this make any sense? James -------------------- |
|
|
Jul 20 2006, 06:11 AM
Post
#3
|
|
Dublin Correspondent Group: Admin Posts: 1799 Joined: 28-March 05 From: Celbridge, Ireland Member No.: 220 |
Helvick. One thing that struck me last night. The amount of incident sunlight absorbed by dust on the panels must be quite inclination dependent. (Think of the size of the shadow of a dust grain, or the path length through a thin dust film as the the angle varies) Maybe this is the reason for the power falling off faster than expected? Interesting idea - this certainly would make sense for beam insolation. The assumption that I made was that the "loss" in power due to dust could be described by a simple efficiency percentage as that seemed to be what the mission planners had thought. Now that I think about it it doesn't make a lot of sense to think it could be so simple. I think I need to try to model this to see how it might effect power throughout the day and as the Sun's altitude changes from Sol to Sol. Diffuse light (which accounts for around 30% of power generated at the moment) is definitely not affected in the same way - by definition it comes from all incident angles after all. |
|
|
Jul 20 2006, 10:26 AM
Post
#4
|
|
Member Group: Members Posts: 713 Joined: 30-March 05 Member No.: 223 |
Hi Helvick,
do you also have current dust accumulation loss rate estimates for Opportunity ? (see also my former posting above) |
|
|
Jul 20 2006, 02:55 PM
Post
#5
|
|
Dublin Correspondent Group: Admin Posts: 1799 Joined: 28-March 05 From: Celbridge, Ireland Member No.: 220 |
|
|
|
Lo-Fi Version | Time is now: 5th June 2024 - 06:04 AM |
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |