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Air Source heat Pump
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<blockquote data-quote="Dave645" data-source="post: 6585089" data-attributes="member: 55822"><p>I agree a Heat recovery system is a must for air tight houses, which I have <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> I get nice cooled air in summer and warmed air in winter via a ground pipe installed in the inlet in the heat recovery system it’s lovely, it replaces all the air every 2 hours about twice as fast as is needed to avoid a stuffy house. And the air is filtered so no flies reduced dust. As it’s extracting dust from the house and delivering filtered fresh air 24/7. The cost of running it is more than covered by the heat load it saves.</p><p></p><p>Open windows are a very expensive solution as you say, especially in winter, an open window will increase your heat load for the entire house by large amounts, I can keep my bedroom cool without an open window I just reduce flow to our bedroom underfloor system.</p><p>if you cannot fit a whole house system, like I have it’s more than possible to fit small scale systems like bathroom extractors heat recovery units, where you think you may need it, you get the same volume of fresh air you just don’t loses the heat from it, you can cut the 100% loss of an open window, to only about an 10-20% loss, with a heat recovery extractor.</p><p>If you take a average house with the needed fresh air of one entire air change for the volume of your house every 4 hours as a minimum, basically your dumping all the heat out of your house every 4 hours with the external air temp that’s outside including when it’s below freezing, so every 4 hours you have to fully reheat your house.</p><p></p><p>Ok a case study, If externally the air temp is 0 C </p><p>In my house incoming air is heated by the soil temperature, so it never dips below 10 C the air leaving my house is at around 22C I lose 5-10% of that difference, so I lose 0.6-1.2 C every 2 hours and I exchange the entire volume of my house with fresh air, while an open window loses on a cold night 22C in 4 hours for the entire volume of the house.</p><p>If your ventilating at the minimum recommended so 11 C in the same 2 hours as me with half as good standard of ventilation. Or the full 22 C in the same 2 hours if you ventilate as well as I do. </p><p></p><p>I think I know which system will have big heating bills. </p><p></p><p>When we look at heating we have to look at the entire system not just heating, but trickle vents are the biggest waste of money, why bother insulating if your only going to just let it escape via trickle vents.</p><p> Retro fitting a heat recovery system into lofts make far more sense. One can very simply be installed in most lofts, where you will struggle is for ground floor if you have a 2 story house but there are some clever options to even do this.</p><p>Heat recovery units normal extract from wet rooms and deliver the clean filtered air to living and bed rooms. If your going for a well insulated home heat recovery is a big saver.</p></blockquote><p></p>
[QUOTE="Dave645, post: 6585089, member: 55822"] I agree a Heat recovery system is a must for air tight houses, which I have ;) I get nice cooled air in summer and warmed air in winter via a ground pipe installed in the inlet in the heat recovery system it’s lovely, it replaces all the air every 2 hours about twice as fast as is needed to avoid a stuffy house. And the air is filtered so no flies reduced dust. As it’s extracting dust from the house and delivering filtered fresh air 24/7. The cost of running it is more than covered by the heat load it saves. Open windows are a very expensive solution as you say, especially in winter, an open window will increase your heat load for the entire house by large amounts, I can keep my bedroom cool without an open window I just reduce flow to our bedroom underfloor system. if you cannot fit a whole house system, like I have it’s more than possible to fit small scale systems like bathroom extractors heat recovery units, where you think you may need it, you get the same volume of fresh air you just don’t loses the heat from it, you can cut the 100% loss of an open window, to only about an 10-20% loss, with a heat recovery extractor. If you take a average house with the needed fresh air of one entire air change for the volume of your house every 4 hours as a minimum, basically your dumping all the heat out of your house every 4 hours with the external air temp that’s outside including when it’s below freezing, so every 4 hours you have to fully reheat your house. Ok a case study, If externally the air temp is 0 C In my house incoming air is heated by the soil temperature, so it never dips below 10 C the air leaving my house is at around 22C I lose 5-10% of that difference, so I lose 0.6-1.2 C every 2 hours and I exchange the entire volume of my house with fresh air, while an open window loses on a cold night 22C in 4 hours for the entire volume of the house. If your ventilating at the minimum recommended so 11 C in the same 2 hours as me with half as good standard of ventilation. Or the full 22 C in the same 2 hours if you ventilate as well as I do. I think I know which system will have big heating bills. When we look at heating we have to look at the entire system not just heating, but trickle vents are the biggest waste of money, why bother insulating if your only going to just let it escape via trickle vents. Retro fitting a heat recovery system into lofts make far more sense. One can very simply be installed in most lofts, where you will struggle is for ground floor if you have a 2 story house but there are some clever options to even do this. Heat recovery units normal extract from wet rooms and deliver the clean filtered air to living and bed rooms. If your going for a well insulated home heat recovery is a big saver. [/QUOTE]
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