Great graphic of the Heat Recovery Ventilation HRV System from Dr Daman.
You should ventilate for sure, it is a way to keep your house safe from dangerous chemicals like carbon monoxide, or toxins from smokers, gas leaks or just from using a household product like hairspray.
In modern homes the architectural structure and design is so airtight that seamingly harmless things can have a larger affect for they are trapped in the house. Also with ventilation the air is much less stuffy so you won't have a problem in your elderly years!
The HRV system is generally placed in the basement connected to the supply+air-return vents in your houses main ducting.
An HRV sytem heats the cold FRESH air from outside when it brings it back in and pushes out the hot stale air and transfers heat from the hot out going air to the cold incoming air.
An HRV system uses aluminum passages that are in close contact with each other and when the heat of the hot air passage touch the cold of the cold air passage it transfers the heat through the aluminum from the hot to the cold.
The HRV system can result in up to 85% of the heat staying in the house!
In winter in Canada the HRV must have a defrost damper. With a defrost damper if the HRV gets frost inside of it the defrost damper will shut down your HRV for a few minutes while the ice melts. Then the HRV starts running again. This keeps your HRV working and in good condition, Dr. Daman
4 comments:
I Read about an article by Thomas Klenck (2001)in Popular Mechanics. I haven't had a chance to read it yet. I would really appreciate another engineer taking a look at it. I have a client who doesn't want to spend the extra cash but wants a really tight building envelope. Frankly I'm worried about carbon monoxide and other pollutants. In your report could you include answers to these questions? I think if we cover everything we can persuade our cliant to go this route.
1. Why ventilate?
2. Where is a heat recovery ventilator generally installed?
3. What is a balanced ventilation system?
4. What is it that the heat recovery ventilator does that the normal balanced ventilation system does not do?
5. How does the core transfer heat from the outgoing warm air to the incoming cold air?
6. What % of the heat can the heat recovery ventilation system hold on to?
7. Why would we need a damper on the HRV in our winter climate?
Thanks Dr Daman
He should ventalate for sure, it is a way to keep your house safe from dangerous chemicals like carbon monoxide, or toxins from smokers, gas leaks or just from using a household product like hairspray. Because in modern homes the architectural structure and design is so airtight that seaminglesly harmless things can have a larger affect for they are trapped in the house. Also the air is much less stuffy so you wont have a problem in your elderly years! The HRV filter is generaly placed in the basement connected tosupply+air-reaturn vents in your houses main ducting. A balanced ventalation system is when you remove the contaminated oxegen from the house, BUT then bring it back in and reheat it. Unfortuanetly this does cost more than an electrostatic filter, however an electrostatic filter does not work nearly to the standard of an HRV system. An HRV sytem heats the cold FRESH air from outside when it brings it back in and pushes the hot stale air and transfers heat WITHOUT CAUSING PRESSURE, but when an electrostatic filter brings the air out it can bring odors and dust and other small things that can acualy cause majour damage too the human body through the walls because of extra pressure. This is espescialy harmfull for small children. An HRV system uses aluminum passages that rub against eachother and when the heat of the two passeges touch it transfers the heat through them. The HRV system can reach up to 85% of the heat to stay in the house! But of course as they say, what comes up must come down. That's how I would represent the world's climate, up is high temps as in tropical climate, but down...the cold climate of Canada the ever beutiful extremes are great but can take their toll on an HRV because of the moist air from the house. With a defrost damper if the HRV gets frost inside of it the defrost damper will shut down your HRV for a few minutes and then melts the ice and starts it running again to keep your HRV working in good conditions,
Dr. Daman
He should ventalate for sure, it is a way to keep your house safe from dangerous chemicals like carbon monoxide, or toxins from smokers, gas leaks or just from using a household product like hairspray.Also an issue with a typical air filter is that they need the suns heat, whearas a HRV does not need to use the sun. In modern homes the architectural structure and design is so airtight that seaminglesly harmless things can have a larger affect for they are trapped in the house. A typical roof space ventalator firstly does not filter through the whole house and also takes the already contaminated air and filters it through your house.The air from the typical way of ventalating, being opening windows etc. it has to be heated again which wastes endless amounts of energie. In basic terms the HRV recycles the air, reheats it and saves the heat up to 85%. Whearas a normal air system saves under 30%. The HRV filter is generaly placed in the basement connected tosupply+air-reaturn vents in your houses main ducting. A balanced ventalation system is when you remove the contaminated oxegen from the house, BUT then bring it back in and reheat it. Unfortuanetly this does cost more than an electrostatic filter, however an electrostatic filter does not work nearly to the standard of an HRV system. An HRV sytem heats the cold FRESH air from outside when it brings it back in and pushes the hot stale air and transfers heat WITHOUT CAUSING PRESSURE, but when an electrostatic filter brings the air out it can bring odors and dust and other small things that can acualy cause majour damage too the human body through the walls because of extra pressure. Some of these things would be just having a shower, redecorating and using things like paint or varnish, or EVEN JUST BREATHING! These things and others are pushed into your walls insulation etc. which can become air-born. This is espescialy harmfull for small children.In an area where redon is an issue (a chemical in the air emited by the earths crust that makes minute constituency in the air) the house must be filtered to certain levels so this is not a problem. The HRV can move up to 200 cubic feet per minute, where the standard is only 15 cfm. The more the air that moves the better, and with an HRV the air is reheated. The HRV is environmentaly safe and safe for YOU! An HRV system uses aluminum passages that rub against eachother and when the heat of the two passeges touch it transfers the heat through them. The HRV system can reach up to 85% of the heat to stay in the house! But of course as they say, what comes up must come down. That's how I would represent the world's climate, up is high temps as in tropical climate, but down...in the cold climate of Canada the ever beutiful extremes are great but can take their toll on an HRV because of the moist air from the house. With a defrost damper if the HRV gets frost inside of it the defrost damper will shut down your HRV for a few minutes and then melts the ice and starts it running again to keep your HRV working in good conditions,
Dr. Daman
I hope that these answers are sufficient you havn't replied.
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