Forum discussion
CS-2009 EAp2: Minimum Energy Performance
According to ASHRAE 90.1 should meet a minimum efficiency for the HVAC equipment, and only appear values of efficiencies for Water Source Heat Pump and Groundwater Source Heat Pump.
As I can get values of efficiency for Air Source Heat Pump used for heating water, and comply with ASHRAE 90.1?
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5903 thumbs up
January 7, 2011 - 5:34 pm
I assume you are asking about a minimum efficiency for heat pump water heaters? If so Table 7.8 does address them. The minimum efficiency is the same as any electric water heater. Since heat pump water heaters are more efficient than a standard electric water heater they more than comply, you should get some savings!
Let me know if I have not correctly interpreted your question.
Rodrigo Perez
ING.IDIEM
29 thumbs up
January 10, 2011 - 9:00 am
When I refer to a unit ASHP, I mean a heat pump unit with air cooled condenser, which is capable of providing chilled water for summer time and hot water for heating in winter season.
I do not know the name you can have these units in the U.S., in Chile are known by the name of aerothermal heat pump or air heat source.
In any case, the response of water heater was helpful, but I would like to know how to get the minimum efficiency of the unit described above.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5903 thumbs up
January 10, 2011 - 9:44 am
Thanks for the explanation. This type of unit is not used in the US as far as I know. It appears as if 90.1 does not have a minimum efficiency requirement. If it is not regulated by 90.1 then there is no minimum efficiency to meet.
Anyone else know more?
Rodrigo Perez
ING.IDIEM
29 thumbs up
January 10, 2011 - 10:35 am
Marcus, at the following website there is a description of the units I have described.
http://www.nueva-energia.es/wp-content/uploads/2008/12/bombas-de-calor-t...
the website is in Spanish.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5903 thumbs up
January 10, 2011 - 11:19 am
As far as we can tell this type of equipment is not regulated by 90.1.
Rodrigo Perez
ING.IDIEM
29 thumbs up
January 10, 2011 - 12:03 pm
thanks a lot.
Christopher Schaffner
CEO & FounderThe Green Engineer
LEEDuser Expert
963 thumbs up
January 10, 2011 - 5:22 pm
Wouldn't these be under Table 6.8.1B Electrically Operated Unitary and Applied Heat Pumps, "Air Cooled"?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5903 thumbs up
January 10, 2011 - 5:42 pm
I guess it comes down to whether the ARI standards (210/240 and 340/360) referenced in 90.1 apply to air-to-air heat pumps only, or also apply to air-to-water heat pumps.
Anyone have access to those standards and can find the answer?
Rodrigo Perez
ING.IDIEM
29 thumbs up
January 11, 2011 - 7:23 am
The ARI Standard 210/240 and 340/360 exclude Heat Pump Water Heater, and the test procedure of ARI 210/240 and 340/360 are not indicated temperature of water (for cooling or heating).
In ARI 210/240 and 340/360 are not indicated specifications for air-to-water heat pump. There are some standard requirement for air-to-water heat pump?
Marcus, on the ARI website can download free the ARI standard.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5903 thumbs up
January 11, 2011 - 9:07 am
That is what I thought. So 90.1 does not regulate this type of equipment. I am not aware of a standard for air-to-water heat pumps. In the absense of a standard, there would be no minimum efficiency requirement in 90.1.