uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old November 18th 11, 02:03 PM posted to uk.sci.weather
external usenet poster
 
First recorded activity by Weather-Banter: Jul 2011
Posts: 37
Default WET BULB MANAGEMENT IN PERIODS OF FROST

Just trying to gauge other peoples managemnt of the wet bulb readings
and I guess that I'm basically looking for best practice, tips, work
rounds and how you rationalise them:

also one quick question re dry bulb/max' temp readings.

1.) this is for those occassions when the Max' temp' is going to be at
or about morning Obs -
the Max' reads 9.9c, but the dry bulb reads 10.0c - what do you
record as the max' temp'?

2.) WET BULB READINGS - when the wick/reservoir are frozen

How do you work it - do you keep iced water handy to coat, spray the
wick
do you just use rain water, other, that isn't necessarily iced?
do you always give it 15 mins to let the temp' fall
do you just record it as it is (not the proper way)
How do you annotate your daily record
any other tips, considerations


  #2   Report Post  
Old November 18th 11, 03:01 PM posted to uk.sci.weather
external usenet poster
 
First recorded activity by Weather-Banter: Jan 2005
Posts: 4,152
Default WET BULB MANAGEMENT IN PERIODS OF FROST

On Nov 18, 2:03*pm, wrote:
Just trying to gauge other peoples managemnt of the wet bulb readings
and I guess that I'm basically looking for best practice, tips, work
rounds and how you rationalise them:

also one quick question re dry bulb/max' temp readings.

1.) this is for those occassions when the Max' temp' is going to be at
or about morning Obs -
*the Max' reads 9.9c, but the dry bulb reads 10.0c - what do you
record as the max' temp'?

2.) WET BULB READINGS - when the wick/reservoir are frozen

How do you work it - do you keep iced water handy to coat, spray the
wick
do you just use rain water, other, that isn't necessarily iced?
do you always give it 15 mins to let the temp' fall
do you just record it as it is (not the proper way)
How do you annotate your daily record
any other tips, considerations


If the DB is higher than the max then one or both of them is/are
wrong. The only answer is to stick to the max thermometer for maxes
unless you can prove it has an error. This will ensure consistency
among maxes even if slightly in error. But screens are rather
arbitrary things anyway and have errors due to variable sunshine and
ventilation.

If the WB is frozen the approved method used to be, and may still
be now, to remove the wick and paint the bulb with water just above
freezing to form a thin layer of ice on it. This sounds rather
tedious and what I would do, if I made this type of reading, would be
to spray the bulb (with the wick still in place) with water and wait
for it to freeze, ensuring that there is ice actually in contact with
the whole of the bulb.

Tudor Hughes, Warlingham, Surrey.
  #3   Report Post  
Old November 21st 11, 10:45 PM posted to uk.sci.weather
external usenet poster
 
First recorded activity by Weather-Banter: Jul 2011
Posts: 37
Default WET BULB MANAGEMENT IN PERIODS OF FROST

Tudor - many thanks for the reply.

I like the 'Spray on' tip for the WB - might give that a go

Re the DB and Max' readings - going with the Max' reading seems to be
the consensus - not quite certain why I have had that 0.1c difference
between the two.
  #4   Report Post  
Old November 22nd 11, 08:45 AM posted to uk.sci.weather
external usenet poster
 
First recorded activity by Weather-Banter: Sep 2011
Posts: 359
Default WET BULB MANAGEMENT IN PERIODS OF FROST

On Nov 18, 2:03*pm, wrote:
Just trying to gauge other peoples managemnt of the wet bulb readings
and I guess that I'm basically looking for best practice, tips, work
rounds and how you rationalise them:

also one quick question re dry bulb/max' temp readings.

1.) this is for those occassions when the Max' temp' is going to be at
or about morning Obs -
*the Max' reads 9.9c, but the dry bulb reads 10.0c - what do you
record as the max' temp'?

2.) WET BULB READINGS - when the wick/reservoir are frozen

How do you work it - do you keep iced water handy to coat, spray the
wick
do you just use rain water, other, that isn't necessarily iced?
do you always give it 15 mins to let the temp' fall
do you just record it as it is (not the proper way)
How do you annotate your daily record
any other tips, considerations


sovesse
  #5   Report Post  
Old November 22nd 11, 08:53 AM posted to uk.sci.weather
external usenet poster
 
First recorded activity by Weather-Banter: Sep 2011
Posts: 359
Default WET BULB MANAGEMENT IN PERIODS OF FROST

On Nov 18, 3:01*pm, Tudor Hughes wrote:
On Nov 18, 2:03*pm, wrote:









Just trying to gauge other peoples managemnt of the wet bulb readings
and I guess that I'm basically looking for best practice, tips, work
rounds and how you rationalise them:


also one quick question re dry bulb/max' temp readings.


1.) this is for those occassions when the Max' temp' is going to be at
or about morning Obs -
*the Max' reads 9.9c, but the dry bulb reads 10.0c - what do you
record as the max' temp'?


2.) WET BULB READINGS - when the wick/reservoir are frozen


How do you work it - do you keep iced water handy to coat, spray the
wick
do you just use rain water, other, that isn't necessarily iced?
do you always give it 15 mins to let the temp' fall
do you just record it as it is (not the proper way)
How do you annotate your daily record
any other tips, considerations


* *If the DB is higher than the max then one or both of them is/are
wrong. *The only answer is to stick to the max thermometer for maxes
unless you can prove it has an error. *This will ensure consistency
among maxes even if slightly in error. *But screens are rather
arbitrary things anyway and have errors due to variable sunshine and
ventilation.

* * *If the WB is frozen the approved method used to be, and may still
be now, to remove the wick and paint the bulb with water just above
freezing to form a thin layer of ice on it. *This sounds rather
tedious and what I would do, if I made this type of reading, would be
to spray the bulb (with the wick still in place) with water and wait
for it to freeze, ensuring that there is ice actually in contact with
the whole of the bulb.

Tudor Hughes, Warlingham, Surrey.


If you're recording the DB and the Max remember to adjust the DB to
agree with the Max (or vice verca). I've never heard of removing a
wick from a wet bulb. The proper method is to paint the wick with
distilled water, about 15-20 minutes before the reading time and an
ice bulb should have formed by observation time. If you have a wet
bulb with a temp below zero, you can induce freezing by touching the
wick with a small scraping of hoar frost.


Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wet bulb measurements below 0C dry bulb temps Tom Bennett uk.sci.weather (UK Weather) 1 January 24th 06 08:38 AM
web bulb / dry bulb??? Stuart Turrell uk.sci.weather (UK Weather) 52 April 25th 05 08:34 PM
New Wet Bulb Wicks Paul Crabtree uk.sci.weather (UK Weather) 4 January 17th 04 11:17 AM
measuring wet bulb Ken Cook uk.sci.weather (UK Weather) 3 July 14th 03 07:18 PM
measuring wet bulb TudorHgh uk.sci.weather (UK Weather) 0 July 14th 03 01:05 PM


All times are GMT. The time now is 06:43 AM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 Weather Banter.
The comments are property of their posters.
 

About Us

"It's about Weather"

 

Copyright © 2017