## Healthy Home Guide

 Happy Australia Day to All our friends and customers.๐๐ฐ๐พ๐ฐ๐พ January 28th 2018

Understanding roof heat.

Sir Isaac Newton created a formula to calculate the temperature of an object as it loses heat. The heat moves from the object to its surroundings. The rate of the temperature change is proportional to the temperature difference between the object and its surroundings. The formula can be used to find the temperature at a given time. The SI unit of temperature is the Kelvin (K), but degrees Celsius () is common.

T(t) = Ts + (T0 - Ts ) e(-kt)

T(t) = temperature of an object at a certain time (Kelvin, K)

t = time (s)

Ts = temperature of the surroundings (Kelvin, K)

T0 = starting temperature of the object (Kelvin, K)

k = a cooling constant, specific to the object (1/s)

(10 Celsius = 283.15 Kelvin)

So, if your roof sheet or tiled area (whole surface of roof) heats up throughout the day at up to 900W/sq.m (approx to 55C-65C), this in turn heats the roof air above surface and beneath internally(cooler). If this air is not evacuated at the constant cooling rate, then this (accumulative) heat then transfers to the internal air and also the structures. This is why youย โfeelโ the heat in the latter part of the day. For greater efficiency, the cooling air should be of greater difference to the object. This can only be done by using the coolest air possible (<22C) - from the shaded South side at a specific flow rate. The best way to do this is using negative pressure with a Solar Whiz roof extraction system. Same rules apply to commercial roofs and buildings also, but with the added bonus of greatly increased WHS due to dust, chemical and process gases being removed. With foodstuff storage warehouses, this system eliminates high product disposal/loss due to early expiration before โsell by datesโ due to excess heat and the baking or stale effect.

December 2nd 2017
 A post shared by SolarVenti Australia (@solarventi) on Nov 25, 2017 at 3:36am PST Proud to be a part of the opening of โThe Black Shed Projectโ in Geelong. The first sustainable and energy saving showroom in Geelong. Thank you, #greenelectrical . (at Geelong, Victoria) November 25th 2017

Roof ventilation

The best way to describe what a whirlybird does is by saying it is like a boat on the open seas without an oar or motor. It is controlled by the wind and the current for direction and flow, with no control over which direction, speed flow or timing.. Thatโs not what you want controlling your home temperatures, humidity or energy bills.

November 23rd 2017
 Sometimes areas requiring dehumidification are along way from source. Ducting your SolarVenti is always an option. SV14K with in-line and extract fans. Bronte -NSW. October 21st 2017
 Another fantastic day, in a fantastic town, in a fantastic country..๐ October 7th 2017
 Home is where the heart is, always keep your home safe and healthy for heart and lungs.. Choose your air and breathe wisely. September 30th 2017
 Ever noticed when you are in the snow you always heat up. At low external temps, humidity can be low - take this air and heat (solar) it up, then transport it indoors . Result :- extremely low humidity fresh air at warm temperatures. #solardrying, #solarventi, #indoorairquality #asthmafree September 27th 2017
 Being a quality Danish product, it is well known the key benefits of a Solarventi are heating and drying. This is just the right sustainable product for units /holiday homes in snow and ski country. #thredbo, #perisher, #snowymountains #ski #alpine (at Thredbo Resort) September 16th 2017
 The next energy disrupter. Solar Air Collectors for #heating, #cooling and #dehumidification, - Naturally..๐๐๐ August 30th 2017