Whirlybirds vs Roof Ventilation vs Solar Cooling

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Re: Whirlybirds vs Roof Ventilation vs Solar Cooling

Postby davidg » Thu Nov 28, 2013 7:13 pm

bpratt wrote:Just got to work out what temperature rating I need to get to put it in.... I doubt getting one rated at say 25 degrees would work, as in winter you really want it to get up as hot as possible.
All thoughts to mull over. :)

I have got them for 25c, 35c, 45c, 55c both N.C. and N.O. ......... install in the shade on a heat sink (smallish aluminum plate) bit of thermal paste, couple of PK's done, then you're using ambient temp rather than sun temp.
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Re: Whirlybirds vs Roof Ventilation vs Solar Cooling

Postby Bthree » Thu Nov 28, 2013 7:34 pm

Bi-metallic temp sensors look promising, in the process of purchasing some ATM for testing, primarily for switching the sump heater of my AC compressor off in hot weather http://www.ebay.com.au/itm/151157898743 ... 1497.l2649

Something to remember, I have found in the spec of the KS301 (KS302) sensor they have a hysteresis of 15deg C across the range. For example if you get a 25degC NC (normally closed) switch it turns off at 25deg as the temp rises but will not turn on again until the temp falls to 10degC.

I am going to try one of these below to control a heat transfer fan setup as the temp in a roof will be quite high exceeding 35deg even in the winter. Not exactly sure if the same above applies to a NO (normally open) switch
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Re: Whirlybirds vs Roof Ventilation vs Solar Cooling

Postby davidg » Thu Nov 28, 2013 7:43 pm

Bthree wrote:I am going to try one of these below to control a heat transfer fan setup as the temp in a roof will be quite high exceeding 35deg even in the winter. Not exactly sure if the same above applies to a NO (normally open) switch

A bit more sensitive not much though about 5C variation that should be a problem as long as you start with say 30C outside in the shade or if in the roof space something somewhat higher 40C or use two together in series so two states a have to occur to work. If it's pure solar power it won't matter once the sun goes down it would stop anyway. :D
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Re: Whirlybirds vs Roof Ventilation vs Solar Cooling

Postby james22442 » Thu Dec 05, 2013 12:11 pm

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Re: Whirlybirds vs Roof Ventilation vs Solar Cooling

Postby lukey22 » Mon Dec 09, 2013 8:39 am

I've been looking at using solar roof ventilation in my home but haven't really got a lot of experience in the subject.

I have a cousin whose installed it on his house but I only looked into it recently.

Are they generally difficult to install? :?:
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Re: Whirlybirds vs Roof Ventilation vs Solar Cooling

Postby james22442 » Wed Feb 19, 2014 9:10 am

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Re: Whirlybirds vs Roof Ventilation vs Solar Cooling

Postby Gordon-Loomberah » Wed Feb 19, 2014 11:40 am

Lukey, they are generally quite straightforward to install, so long as you are a bit handy with tools and are comfortable working on the roof.
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Re: Whirlybirds vs Roof Ventilation vs Solar Cooling

Postby nicholassolar » Wed Apr 16, 2014 12:31 pm

Yeah a good reference is the www.roofventilationblog.com.au

I've picked up some stuff I didn't know from there.
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