Is there a need for radiant barriers ?

May I know what is radiant barriers?

BERITA SAHAM KINI

GOOD NEWS..............QUALITY EBN @ RM5600!!!! So don't sell low but must sell one month before CNY to get best price !!!!!!!!!!!!

Heat is emitted from a hot body via the infra red spectrum. Hence the term "infra red heat".

Matt Black bodies emit more efficiently than shining white bodies. So Black bodies also absorb heat whilst shining white bodies reflect heat.

Infra red heat will cross a vacuum. There is no conduction or convection through vacuum.

As with any form of heat transfer, there implies that there must be a difference or gradient between the 2 bodies.

Conduction and convection are both probably far more efficient at transferring heat than radiation. eg. touch is conduction, being very close is usually convection, as in touching hot water, holding your hand very close above hot water and part radiation when you hold your hands to the side, avoiding the hot air.

Radiation is also subject to the inverse square law where if you double the distance you quarter the radiation. Which is why our Sun does not burn us to crisp.

A radiant barrier is a shiny white surface as in aluminium foil, mirror surfaces etc. that will reflect heat transfer by radiation.

Some special paints have specialised particles that reflect such heat. As the heat from out sun is radiant, having such paints will be effective in reducing the radiation from the sun. Manufacturer claims may seem miraculous but in actual practice, the paints' performance decreases very quickly with time. Similarly, shining aluminium foil becomes dull very quickly.

Spacecraft rely on pure Gold foil for lasting effects. Space is relatively dust free whereas on Earth, dust will quickly settle and render the shining surface as good as gone.

So, do we need a radiant barrier.

IMHO, it is unnecessary and impractical, especially in a stand alone BH where you can use insulation like EPS. In the event that insulation is not good enough, then painting the top white might help(but that requires mantainence). OTOH, spreading a little muck on the top and allowing moss and algae to grow will effectively reduce very much radiation from the sun as this vegetation will effectively absorb the heat. So far most people in Malaysia have been happy with using 3" EPS to maintain about 29-31 deg. c. Lower temperatures might not be good for the hatching of eggs.

tuckfook.
A very good share

my little add-on
"To perform properly, radiant barriers need to face open space (e.g., air or vacuum) through which there would otherwise be radiation."
http://en.wikipedia.org/wiki/Radiant_barrier

Very few opportunity for our purpose unless it's OVER the roof ..if your BH has one.
A radiant barrier UNDER the roof...err I may be wrong.
Will the barrier not 'reflect' the radiant heat back to under the tiles/roofing sheets to radiate back to the barrier... repeatedly?

Thank you, TuckFook. Appreciated, you learned well.... hope I do remember well.

May I add alittle, most importance of all place to maintain temperature is the ceiling where the birds shall make their nests. Secure the area well, you may be rewarded. Also, a roof over the ceiling top may also do the job of preventing overheating of the ceiling area.

Today I checked my ceiling temperature as it had been cloudy for 3 days running.

Max. was 27.5 deg.C min. was 26 deg.C. that's not ideal for hatching eggs fast. I hope the sun will come out soon. If the next few days remain cloudy, it might get colder.

I am wondering if anyone has employed some system of heating to maintain optimum selected temperature. May not be required very often but nice to have when needed.

I'm am truly amaze with your knowledge and I sincerely thankful for this lesson my sifu friend.

Change of topic, I would like to bring all blogger here to my fresh experience about a rumor. It have been circulating here in Kota Kinabalu for awhile now. A friend of mine told me there is somebody controlling the bird nest market from China. This people is alleged to be from Indonesia. It come to my attention when a friend with about 20 box of bird nest can not sell it to the open market and those that offer him do not want to pay our government export taxes. What we here end up with is low price even for 180°, big size and white nest only can go up to RM3500 only (un process). From there on price down until RM2000 for C grade. Any comment?

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Added on December 5, 2010, 10:35 pmSifu friend RM5600 is price for process nest or raw nest? Thanks.

This post has been edited by mfyapp: Dec 5 2010, 10:35 PM

For the past few years the highest price is around 4 to 3 weeks before CNY, so can keep if u no need money urgently.

You haven't factor in body heat with down feather insulation from the mother bird.

thank for info

Only yesterday, one of my friend sold his small and feathered nests for Rm4900 and mind you.........less than 2 fingers. THe buyer want only white nests and mine, brown bigger than 3 fingers as I never harvest my nest with eggs nor chicks and allow them to breed so if mine cannot get best price, so be it and I am happy with Rm4K+ for my brown and heavy weight BN. Here, Processed nest are sold at Rm6800 and I helped my friend to sell to some Chinese men here on project Study @ Rm8K per kilo processed EBN. So, if any seller want to sell at RM4000 for white and big nest, I buy and resell at a profit of more than 1K......now only as prices fluctuate fast.

If CNY EBN sales in China is good, then we expect the price will go higher but otherwise, then down..............

Come any month and if any buyer want nests, I have it even during monsoon time.......but fair price!!!!

As for EBN in China, most of the EBN are smuggled into china by runners from HK for a fee and it has been going for century. So, for us to compete with them will be very difficult as their cost is cheaper than us without having to pay any tax and to make it worst, our own departments are creating so much difficulties to export legally so don't blame people who want to export sell it to the Indo who have contacts in HK to smuggled EBN into China. Even in China, the situation isn't easy cos you need good contact to sell your EBN or else, you end up selling them @ chinese pasar malam or cheap price.

A little about China marker, , EBN is cheap in Guangzhou as most of the nest are of Indonesian type but in other region like Shanghai, EBN can go from CNY20K to CNY60K at outlets.

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Added on December 6, 2010, 12:39 pmHey, no wonder that they say, birds of the same feather fly together. Like me and you, because a few days ago, I was toying with the idea of using heater in the BH during monsoon time and what best way to do it without overheating the BH.

Any bright idea.

This post has been edited by West Wing: Dec 6 2010, 12:39 PM

Yes, we used heater last month in our BH. It is a heater with fan type and can pre-set the on-off temperature.
We can control the required temperature range satisfactorily.
Our temp went down to 24 degree celcius and humidity shoot up to 96%RH before we decided to use it.
See details in http://swiftletsourceofinformation.blogspo...og-post_04.html





http://mynewventureswiftlethome.blogspot.com

This post has been edited by Tweeter: Dec 6 2010, 03:27 PM

Those enforcement is back in TOWN on 9/12.

Sarawak farmer will have some party inside BH soon

Birdnest Trading Control in China.

I suspect that nest trading in China is controlled by TaiKor as I tried to sell nest direct and wholesalers were not keen to buy so quoted a ridiculously low price. The price was about 50% of what I can get in Malaysia.

There is so very much money to be made by the middlemen that I cannot see any TaiKor not wanting a piece of the action. Just as in the Drug trade.


Heating

I employed a form of solar heating for my converted shophouse and this 'hot' water was used in the humidifier. Since using a hygrostat, very much less water was being sprayed so that does not contribute to any heating but fortunately temperatures remain about 27Deg. C range.

In a standalone, especially these few months with rain and more rain AND the North Wind blowing, it really gets cold. Night temperatures have been down to 23Deg.C regularly. I'm wondering if it will affect the birds' eggs as I believe they may take too long to hatch or not hatch at all.

Without any artificial ventilation, a few vent holes open, the North wind is capable of making the inside of a BH lower than 26 Deg.C especially as the day tempt. is only about 27 Deg.C.

Yes, it might be a good idea to employ a small heater but the electric bill will soar !

I suggested a "moat" surrounding the BH, to a friend in Thailand, nr BKK. as there the temperatures can get quite low for a longer period. A large body of water can stabilise surrounding temperatures quite well. By circulating this water that is warmed up by the Sun, we can control the BH's internal temperature. This will involve electric pumps.

As the parent birds are out most of the day, they do not contribute to incubating the eggs. At night, I seldom see the parent birds sitting on their eggs either. So the heat from the parents will not be a contributing factor is my guess.

So many ideas to work on so right now I am closing down more of the ventilation holes, especially those facing North.

As far as I know,

There isn't any Godfather controlling the EBN sales but that the big timers in China aren't happy when we tried to undercut their price and you may ask some of those Malaysians exporting EBN to China and they will have stories to tell. Do it quietly without disturbing the Big Guys and they may leave you at peace or otherwise, they may get the authorities to charge you. The big guys there have millions to spend and EBN is a lucrative buz and they are not going to let afew Malaysians trying to spoil their market.

Wanna sell directly to China; you need contacts in China like my friend who happen to meet his old school mate in China and recommended him some buyers in China and once, the Chinamen KOK with you and make friend, then the climate and situation became totally difference.

The buyers in Guangzhou know our price in Malaysia better than some of us so only thru good connection, you may make profit and in volume, you, too will prosper....be be careful, all must be done in cash and never be too greedy to do big and make rich quickly.

My knowledge on Exporting EBN to China to share.

Jus drop in to say hi to all taiko long time nvr visit this thread.... but lately my ex boss are interested in BN biz... and wan to set up one at sarawak here... and i found one land near beach.... not sure how many population there atm.. havent do bird test... but not far from the land there is a bird house also... so i guess at least there is some swiftlets ...

my question is... i m not experiance in doing a BH.... so you guy do suggest me hire a "consultant" ? as we all know tat they will wan a share from ur BH rite.... or any sifu here willing to set up for me and charge some money rather than those company charge ?

[quote=Jackygwh,Dec 9 2010, 08:35 PM]
and i found one land near beach.... not sure how many population there atm.. havent do bird test... but not far from the land there is a bird house also... so i guess at least there is some swiftlets ...


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Sempadi Land...

[quote=kuching_farmer,Dec 10 2010, 12:13 AM]
[quote=Jackygwh,Dec 9 2010, 08:35 PM]
and i found one land near beach.... not sure how many population there atm.. havent do bird test... but not far from the land there is a bird house also... so i guess at least there is some swiftlets ...
[/quote
Sempadi Land...

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Uncle Ben where are u. This newbie needs your help so am i. Mine is a stand alone birdhouse in rubber plantation, results only so so la. Found out during last harvest last week the nests are very wet and one or two show sign of pinkish colour. I do not operate any humidifier yet humidity is very high. Please advice all sifu how to solve this. Thanks

bro how long ed ur house ?? hows the result ? how many kg now per month ?