Browse Forums Heating, Cooling & Insulation Re: Ventilation in bedrooms with dual glazed windows 30Apr 03, 2018 1:05 am alexp79 But reverse cycle air cons do have heat exchangers? So should be able to heat the air? Then what's the point of dual glazing if reverse cycle ACs can chill/heat the air? Topic is about ventilation and your regular split system does nothing for that Re: Ventilation in bedrooms with dual glazed windows 31Apr 03, 2018 1:12 am Sergey alexp79 But reverse cycle air cons do have heat exchangers? So should be able to heat the air? Then what's the point of dual glazing if reverse cycle ACs can chill/heat the air? Topic is about ventilation and your regular split system does nothing for that Traditional double glazing has extremely low insulation R values, it is always the weakest link in thermal insulation when comparing even to sub standard insulated walls. Therefore, the idea is that you still use AC to chill or heat the air, and then your double glazing helps to prevent cold or heated air from leaving the house (and, therefore, your AC is not heating/cooling as hard as in single glazing case), however, when comparing to single glazing, it will only be 2x-3x more efficient in insulation, but around 5x to 10x less efficient than your walls insulated to R2.5. Also, if your house has internal thermal mass in place, then you can turn AC only for limited period of time to cool or heat up your thermal mass and then thermal mass starts releasing heat/cold overnight. Re: Ventilation in bedrooms with dual glazed windows 32Apr 08, 2018 12:02 am Sergey alexp79 My understanding that HVAC in US is exactly the same thing referred as ducted aircon in Australia. Every ducted aircon has ability to grab air from the outside. With an extra add on. But that air will be just air from the outside, no heat recovery is done. Standard ducted systems in Australia do not normally install it, but as with most things - one can make it work You'll find that any ventilation system installed in Australia is required to comply with AS1668:2 in regards to minimum fresh air. It used to be 10% of the measured air volume. Now it is area x 0.38L/s generally or calculated on number of occupants. Installers in residential settings used to rely on leaky houses to satisfy the minimum fresh air requirement. For newer sealed up draft free houses I'd be concerned if the installer didn't add a fresh air intake, else they're more issuing the plumbing compliance certificates. Re: Ventilation in bedrooms with dual glazed windows 33Apr 08, 2018 12:10 am Bels Sergey alexp79 My understanding that HVAC in US is exactly the same thing referred as ducted aircon in Australia. Every ducted aircon has ability to grab air from the outside. With an extra add on. But that air will be just air from the outside, no heat recovery is done. Standard ducted systems in Australia do not normally install it, but as with most things - one can make it work You'll find that any ventilation system installed in Australia is required to comply with AS1668:2 in regards to minimum fresh air. It used to be 10% of the measured air volume. Now it is area x 0.38L/s generally or calculated on number of occupants. Installers in residential settings used to rely on leaky houses to satisfy the minimum fresh air requirement. For newer sealed up draft free houses I'd be concerned if the installer didn't add a fresh air intake, else they're more issuing the plumbing compliance certificates. Are they required to measure it? They can always say (in my house) that I retrofitted my windows etc after they did the install Re: Ventilation in bedrooms with dual glazed windows 34Apr 08, 2018 1:10 am Generally it's calculated on xxx volume of air will require yyy volume of fresh air which requires zzz size duct. When was your house built? The revision of 1668:2 I'm referring out of was released in 2012 so anything built after that date will need to comply. Re: Ventilation in bedrooms with dual glazed windows 36Apr 08, 2018 1:35 am Bels Sergey alexp79 My understanding that HVAC in US is exactly the same thing referred as ducted aircon in Australia. Every ducted aircon has ability to grab air from the outside. With an extra add on. But that air will be just air from the outside, no heat recovery is done. Standard ducted systems in Australia do not normally install it, but as with most things - one can make it work You'll find that any ventilation system installed in Australia is required to comply with AS1668:2 in regards to minimum fresh air. It used to be 10% of the measured air volume. Now it is area x 0.38L/s generally or calculated on number of occupants. Installers in residential settings used to rely on leaky houses to satisfy the minimum fresh air requirement. For newer sealed up draft free houses I'd be concerned if the installer didn't add a fresh air intake, else they're more issuing the plumbing compliance certificates. I guess this where the BASIX guys are recommending to install ventilation fans into the bathrooms. It it not anyhow regulating requirements for ducted aircon installers. Also, the standard itself seems to be a bit stupid as most people are simply opening up windows at night (in summer) or at day (in winter) to ventilate their houses (for short periods of time mostly). If you have a tight house, you won't be using your aircons days and nights for sure. Re: Ventilation in bedrooms with dual glazed windows 37Apr 08, 2018 1:40 am Sergey Key word is fresh. Ventilation is different to ducted air conditioning, though cost as much. fresh air or outside air, I use and interchange them depending on how I feel. essentially the same thing. The title of AS1668:2 is: The use of ventilation and airconditioning in buildings Part 2: Mechanical ventilation in buildings This is the standard any installation would need to comply to. Re: Ventilation in bedrooms with dual glazed windows 38Apr 08, 2018 1:52 am alexp79 I guess this where the BASIX guys are recommending to install ventilation fans into the bathrooms. It it not anyhow regulating requirements for ducted aircon installers. Also, the standard itself seems to be a bit stupid as most people are simply opening up windows at night (in summer) or at day (in winter) to ventilate their houses (for short periods of time mostly). If you have a tight house, you won't be using your aircons days and nights for sure. Regulation of ducted air conditioning installations still falls under the plumbing compliance board in each state as refrigerated air conditioning falls under plumbing. The standard is what industry is required to be working to. Don't like it then give your feedback to a body like Airah for discussion and dissemination when reviewing and revising amendments to the standards. If your shortsightedness of that of your architect means you didn't factor in ventilation requirements then you're stuck with opening windows for ventilation or need bite the bullet and get something like an ERV system. Re: Ventilation in bedrooms with dual glazed windows 39Apr 08, 2018 2:16 am Bels alexp79 I guess this where the BASIX guys are recommending to install ventilation fans into the bathrooms. It it not anyhow regulating requirements for ducted aircon installers. Also, the standard itself seems to be a bit stupid as most people are simply opening up windows at night (in summer) or at day (in winter) to ventilate their houses (for short periods of time mostly). If you have a tight house, you won't be using your aircons days and nights for sure. Regulation of ducted air conditioning installations still falls under the plumbing compliance board in each state as refrigerated air conditioning falls under plumbing. The standard is what industry is required to be working to. Don't like it then give your feedback to a body like Airah for discussion and dissemination when reviewing and revising amendments to the standards. If your shortsightedness of that of your architect means you didn't factor in ventilation requirements then you're stuck with opening windows for ventilation or need bite the bullet and get something like an ERV system. I am struggling to understand what you mean here. Here are my points, please let me know what exactly is not logical: 1) ERV system is a good thing to have, no doubts, but it is not definitely not installed by everyone and is not popular thing at all. 2) People in tight houses and in moderate climatic zones are certainly not using their 12kW+ ducted systems to ventilate their houses day and night, even if installer designed in outside ducts into the installation. If your house is tight and well oriented, you would be running your ducted system may be few days a year if running at all. 3) So unless you have ERV, you are destined to open the windows (i.e. use natural ventilation) in order to ventilate the house. Re: Ventilation in bedrooms with dual glazed windows 40Apr 08, 2018 2:30 am I have started this discussion so that other people retrofitting double glazing into their homes are aware of ventilation requirements. Summer - yes, you can open a window, unless it's too hot and you are running your split system which does not bring any fresh air. In winter its unlikely that you will sleep with an open window. In my test even if I ventilate before bed, 2 adults and a child will bring the CO2 levels above the recommended guidelines I don't know them all, the first 2 top of your list are best known. Rylock is a good company, Stegbar is for sale. 4 16249 Brass fly wire, you will need to cut it, shape it and jam it into brick slots 1 7493 |