HVAC design, Manuals J, S, T, & D, Duct leakage, Air flow, ENERGY STAR new home requirements, and more. Since heating & cooling are such a big part of home energy use, understanding HVAC is critical.See More
"For multi-split systems, plan on roughly $2,500-3,000 per indoor "head"....on the lower side if it's 4-5 heads...on the higher side if it's just two heads. This will also vary up or down up to $500 per head depending on if…"
"Graham, The U.S. is catching up to Germany very quickly on solar installs. As of the end of 2013, the Germany-to-U.S. cumulative installed solar capacity ratio was about 2.6 to 1. At the end of 2014, it will be closer to 2 to 1. The U.S. will likely…"
"There are in-duct measurement techniques that are accurate enough for this purpose. Here's what I use - http://www.kele.com/flow/fxp-series.aspx It's essentially an "averaging" pitot tube to take care of the likely…"
"Why are you wondering how much airflow occurs at this intake?
1) Required for Energy Star 3.0 certification
2) Code compliance
3) Ensure there's enough airflow to help ensure healthy indoor air quality
4) Ensure there's not too…"
Good to hear you're evaluating the reduced airflow form the CAR's. I'm interested to see the results.
Regarding the discharge airflow - comfort issues are relatively easy to mitigate with location, placement and…"
"Are you kidding me? That's the worst thing I've heard all month. Cutting the airflow across the heat exchanger of a heat pump system by 50-60% will significantly reduce capacity and efficiency. I'm glad I'm not a rate-payer in…"
"The ATI-50 and ATI-66 have a 6" diameter discharge collar on the top of the unit that can be ducted in the case of installations in small spaces. In the particular scenario I've been discussing, the discharge is ducted about 15' over…"
"The ATI-66 for the seven-person household is in conditioned space (hallway closet between kitchen and living room), so the ambient temperature is pretty consistent. I'm sure HPWH's have a harder time keeping up with demand in colder months…"
"It seems like a better solution would be a larger tank for the HPWH in these situations, such as the Steibel Eltron or the AirTap ATI-66. Certainly, both of these are more expensive than the 50-gallon models from GE, Rheem etc., but they also have…"
"Yes, this can be done and is done.
Many of the ductless heat pump manufacturers have these types of units available. The most well-known is 'City-Multi" from Mitsubishi. The ratio of indoor units to outdoor units depends on the…"
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