Does locating an AC condenser out of the sun (east vs. west side of house) make significant difference in real world efficiency? Does anybody have a link to a case study?

Views: 250

Reply to This

Replies to This Discussion

Hello Bob,

This topic has been thoroughly researched, indeed:  Condensor Shading . They conclude that any savings produced by localized HVAC condenser shading are modest, <3%, or even less. Much more important is the effect of vertical and horizontal air blockage. I have currently been recommending to my clients the following: zero vertical impedement for 20 feet, two feet from house, two feet from fences or bushes, five feet from any other condensors. I hope this information is helpful to you!

Tom Delconte

Hi Bob,

I was given a report a handful of years ago by our coating distributor in Texas.   He gave me the following information.

His neighbor had an ac unit with the condenser on the outside at ground level.  Two pipes ran up the wall to attic floor level, made a 90 into the attic.  For years the neighbor left the pipes bare, bare metal.  H e at some point had wrapped them with foam pipe insulation.  He had noticed no improvement in the air temperature or his electric bill.

 

Our guy. Joe Merrill, suggested they remove the foam and coat the pipes with our  radiant barrier coating and see what happens.  They did that and the owner said he and his wife felt it made a difference in the temperature of the house.  They were happy and it was left like that.

No exact temperature readings were taken and I never heard if there was any noticeable difference in the electric bill.  I wish I could find out more particulars but Joe passed away in early 2013.

 

An effective radiant barrier material provides a shading effect.  Any time yuou can provide shade or a shading effect on outside cooling equipment, absolutely it is going to alloow that equipment to operate more efficiently.

 

One must also be aware that EVERYTHING around a building absorbs the sun's radiation during daylight hours.  Those 'things' then radiate that heat out towards the cooling equipment that it must overcome, even in the shade of a house, tree, etc.  AND those things will still radiate heat in all directions after the sun goes down.

I recall a large hospital in Porterville, CA.  On one of their 3 levels of roof, you could hardly see the roof because of the ductwork on top.  They had spent a fortune with a machine shop that mader, basically, oversize galvanized shrouds that were set over the top of the existing galvavized ductwork.  They did this to provide the 'Shading effect' they hoped would drop their electric bill and cool all their labs below.  It had next to zero effect as the metal shroud got to 196 degrees and radiated that heat inwards to the galvanized ducts.  They had no clue about heat transfer.  Ther was a 4 inch distance between the shoud and the duct metal.  They still experienced heat gain from radiation and convection.

 

In the hot months, ANYTHING you can do to provide shade will help.

 

 

 

 

 

I'm with you on the small local shading as shown in the study, don't think it makes much difference. Moving the condenser from the sunny to shaded side of the building *may* be different due to the potentially cooler air entering the condenser. Outdoor temp sensors for weather stations show a higher temp on the sunny side of the building even when the sensor is shaded.

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network.

Latest Activity

Rick Karg replied to Carly@AirCycler's discussion The (Small) Cost of Ventilation Without Recovery
"As a member of the ASHRAE 62.2 committee (and president of Residential Energy Dynamics, the author…"
21 hours ago
Bradford E. White replied to Elizabeth Guinn's discussion ERV in need of backflow preventer.
"I would use an in-line backdraft damper such as Artis Industries or the ones made by Fantech and…"
yesterday
Kim Tanner posted a video

Wireless Air Leakage Testing

This webinar will discuss the use of WiFi technology to conduct and document blower door and duct leakage tests for compliance with local energy codes. The s...
yesterday
Profile IconPerry Grossman, Daniel Pate and Ottawa Furnace Filters joined Home Energy Pros
yesterday
Kirsten Richnavsky added a discussion to the group Building Performance Institute (BPI)
Thumbnail

Breaking the link between unhealthy homes and unhealthy kids

Listen in on IAQ Radio to a discussion on reducing the household triggers that cause asthmaattacks…See More
yesterday
Kirsten Richnavsky posted a discussion

Breaking the link between unhealthy homes and unhealthy kids

Listen in on IAQ Radio to a discussion on reducing the household triggers that cause asthmaattacks…See More
yesterday
Kim Tanner posted events
yesterday
Ottawa Furnace Filters posted a blog post

Some Useful Information about Furnace Air Filters

There is not much we can do about the air pollution outside of a house in Ottawa, Canada, but we…See More
yesterday

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service