Browse Forums Heating, Cooling & Insulation 1 Sep 07, 2007 7:12 pm When you shop for a heating system, be it ducted or otherwise, do you ask the supplier the question as to what the maximum temperature the heating system would be able to deliver on a cold winter day? Or do you just assume that a heating system should be able to deliver in an acceptable range of temperatures? Acceptable meaning around 25 degrees tops? Re: Heating system performance 2Sep 14, 2007 4:13 pm Hi Mek,
Gas ducted heating will always be hot and you needn't ask the question. Reverse Cycle A/C units have limitations when heating and you should ask. In Melbourne here are the Carrier Dry Bulb Design Conditions that are used: Summer Outdoor Temp: 35 Summer Indoor Temp: 24 (11deg difference) Winter Outdoor Temp: 4 Winter Indoor Temp: 21 (17deg difference) So basically on a 4 deg day indoors with a Carrier R/C unit the indoor temp will be 21. It is possible to request a high Dry Bulb Condition when having the system designed. You may wish indoors to be 25 on a 4 deg day, but above is the HVAC standards. Hope this helps! Dynamic Heating & Cooling - http://www.DIYheating.com.au DIY Ducted Heating & Cooling Systems DIRECT to the public Re: Heating system performance 3Sep 14, 2007 4:25 pm Is the 4 degrees winter figure a daytime or nightime figure? It would be a very cold winters day if it got down to 4 degrees durin ghte day, at least in Sydney. Demolition August 2009, Construction Started September 2009, Completed December 2010 Re: Heating system performance 4Sep 14, 2007 5:15 pm Thanks mark. I'll add a note to the hydronic heating thread since this was the system I was interested in.
Casa, I believe Sydney's minimum temperature will be different to Melbourne, but mark might be able to give more info. Re: Heating system performance 5Sep 18, 2007 11:52 am Ok here are the sydney dry bulb design conditions
Summer Outdoor: 31 Summer Indoor: 24 Winter Outdoor: 7 Winter Indoor (Living/Sleeping): 21 / 18 hope this helps Dynamic Heating & Cooling - http://www.DIYheating.com.au DIY Ducted Heating & Cooling Systems DIRECT to the public Re: Heating system performance 6Sep 18, 2007 12:16 pm I was also told with regards to ducted gas heating units, they should be on average 1 kw to 1 sq of house. eg: 24 sq of living (not including garage or outdoor area) you would require a 24 kw ducted heating system to do job most efficiently.
This information was supplied by a heating/cooling supplier in Melbourne, I don't know how accurate it is as such but it has been re inforced by some other suppliers..... Re: Heating system performance 7Sep 18, 2007 12:47 pm A kW per square is a very rough guide. A heat load calculation MUST be done on every home needing heating or cooling. This is what will determine how many outlets are need, what size they should be and finally what size heater is required.
There should be no guess work with this, all too often plumbers etc will just stick an outlet in each room - she'll be right mate, style. Ask for a copy of the heat load calculation - it looks confusing but proves there is no guess work. When spending thousands on heating and cooling you'd want to make sure it is sized up and designed properly. Dynamic Heating & Cooling - http://www.DIYheating.com.au DIY Ducted Heating & Cooling Systems DIRECT to the public Hi We are building in the Hunter Valley, our soil test is H1, our builder has advised us they need to have a letter signed for Fair Trading as the new drainage standard… 0 3551 Does anyone have a suggestion for a good hydronic in slab heating speacialist who may be able to help me with an existing system and wether or not it may need a seperator… 0 4882 Once you know the basics, the rest is easy. Read my post in the thread linked below. viewtopic.php?p=1919271#p1919271 2 19516 |