EcoRenovator  

Go Back   EcoRenovator > Improvements > Appliances & Gadgets
Advanced Search
 


Blog Register 60+ Home Energy Saving Tips Recent Posts Search Today's Posts Mark Forums Read


Reply
 
LinkBack Thread Tools Display Modes
Old 08-18-16, 08:42 AM   #1
Lurking Renovator
 
Join Date: Nov 2015
Location: Pardubice, Czech Republic
Posts: 25
Thanks: 11
Thanked 4 Times in 3 Posts
Default WonderFridge

Hi, during last september I've modded my refrigerator with aluminium-styrofoam foil. I've attached the foil between compressor and freezer part. I also added the foil between refrigerator and back coils.
Refrigerator is whirlpool, cca 12 cu ft (220 liters refrigerator and 110 liters freezer). It's rated for 0.9 kWh/day.
Before mod it used 0.9 kWh/day in the summer and 0.45 kWh/d in the winter (both are averages during one week).
After mod it's under 0.4 kWh/day in winter (lowest was 0.35 when wife was away for week :-)) and 0.6 kWh/day in summer (highest 0.75 kWh/day).

I recommend this mod to everyone.


Attached Thumbnails
cam00166-jpg  

Last edited by Daox; 09-07-16 at 12:18 PM..
JimiQ is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
The Following 2 Users Say Thank You to JimiQ For This Useful Post:
Daox (08-18-16), ecomodded (08-21-16)
Old 08-18-16, 02:50 PM   #2
Administrator
 
Daox's Avatar
 
Join Date: Aug 2008
Location: Germantown, WI
Posts: 5,247
Thanks: 906
Thanked 338 Times in 273 Posts
Default

Wow, impressive reduction in energy usage there.

How thick was the foam insulation you used?

More pictures would be great if you have them.
__________________
Current project -
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
&
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Daox is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 08-19-16, 12:22 AM   #3
Lurking Renovator
 
Join Date: Nov 2015
Location: Pardubice, Czech Republic
Posts: 25
Thanks: 11
Thanked 4 Times in 3 Posts
Default

Foam is 3 mm (1/8th of inch) thick. It's the cheapest one I could get. Mod cost around $4 and already (in 319 days) saved nearly $8.

Average consumption is 514Wh/d, before mod I have no complete numbers, just the two values (summer + winter). If I average them, it's 670Wh/d. So savings are around 23%. Although this year has a bit colder summer, so that must be taken in account.

This morning (there's already 7 AM :-) ) I've realised that compressor isn't room temperature before starting a new cycle. So that's something to work on.

Picture is a bit blurry, I don't have proper camera, just ****ty phone :-)
The plastic container is for condensated water drained from refrigerator. As you can see I've made few small mods, but I don't know if they have any impact, or even if they don't harm the consumption. I just hated that cold and hot pipes were so close together and uninsulated.

Attached Thumbnails
cam00170-jpg  

Last edited by Daox; 09-07-16 at 12:17 PM..
JimiQ is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 08-20-16, 11:03 AM   #4
Supreme EcoRenovator
 
Join Date: Jan 2010
Location: elizabethtown, ky, USA
Posts: 2,199
Thanks: 316
Thanked 554 Times in 463 Posts
Send a message via Yahoo to jeff5may
Default

A warm compressor actually is a good thing. This ensures there is no condensed refrigerant in the compressor. The amount of heat stored in the shell is not huge. Having a warm compressor on start-up actually helps the condenser hx start doing its job earlier, shortening capacity ramp-up from equilibrium.

The best easy thing you can do after insulating the box is to insulate the suction line. I use armaflex closed cell foam pipe wrap. The heat not gained by the exposed piping helps the compressor run cooler by reducing superheat.
jeff5may is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
The Following 2 Users Say Thank You to jeff5may For This Useful Post:
JimiQ (08-20-16), stevehull (08-20-16)
Old 08-21-16, 02:29 AM   #5
Lurking Renovator
 
Join Date: Nov 2015
Location: Pardubice, Czech Republic
Posts: 25
Thanks: 11
Thanked 4 Times in 3 Posts
Default

I'm not completely sure, but I guess compressor isn't warm during winter (we usually don't heat much, so there's like 21C (70F). Also my refrigerant is R600a, which has boiling point -11.7C, which to me loks pretty warm, since freezer should be cooled to -18C. That means suction line can still contain liquid refrigerant, am I right?

I am no expert in refrigeration, so I don't know if my assumptions are correct.

Also I thought that condensator is doing best job when it's end is room temperature (which in my case it's not during cycle, only at the beggining).
JimiQ is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 08-21-16, 09:15 AM   #6
Supreme EcoRenovator
 
Join Date: Jan 2010
Location: elizabethtown, ky, USA
Posts: 2,199
Thanks: 316
Thanked 554 Times in 463 Posts
Send a message via Yahoo to jeff5may
Default

r600a is a little lower pressure than r-134a on the pt curve. When the freezer is freezing, there is actually less than atmospheric pressure in the evaporator and suction side of the circuit. As box temperature falls, so does evaporator pressure. At design minimum freezer box temperature, the evaporator may be operating with half a bar of vacuum.

The condenser side of the circuit follows room temperature. At normal room temperatures, the high-side pressure is usually in the 2 to 3 bar range during operation. This relatively low pressure is the reason most refrigerators last many decades before they develop a refrigerant leak. Even a badly fatigued or corroded run of tubing will hold this amount of pressure until it literally crumbles apart.

The condenser has one main purpose: move heat to ambient air. As long as it is warmer than room temperature and airflow is not obstructed, it is doing its best. Even if airflow is somewhat blocked, it still does a good job, as manufacturers routinely oversize this hx.

Trying to improve condenser performance is challenging with refrigerators. Due to the low compression ratio the compressor works against (2 to 3 bar), lowering condensation temperature doesn't have much energy saving effect. On large, commercial walk-in freezers, the most common upgrade is a txv, which matches up evaporator temperature and flow rate of the compressor to save energy. On residential iceboxes, the txv is considered an unnecessary extra moving part that can fail.
jeff5may is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
The Following User Says Thank You to jeff5may For This Useful Post:
JimiQ (08-21-16)
Old 08-21-16, 12:06 PM   #7
Lurking Renovator
 
Join Date: Nov 2015
Location: Pardubice, Czech Republic
Posts: 25
Thanks: 11
Thanked 4 Times in 3 Posts
Default

So will anyone else try this? I'd like to know if my results are repeatable
JimiQ is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 08-21-16, 10:12 PM   #8
Supreme EcoRenovator
 
Join Date: Sep 2012
Location: Vancouver Island,Canada.
Posts: 1,036
Thanks: 116
Thanked 99 Times in 86 Posts
Default

JimiQ I like your thinking , my fridge has been insulated since 2012 , 4 years of savings and going strong.

With this 2007 Kenmore fridge the daily kWh average is .938 kWh a day , savings can certainly be had , a picture is worth a thousand words









__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Last edited by ecomodded; 08-21-16 at 10:51 PM..
ecomodded is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
The Following User Says Thank You to ecomodded For This Useful Post:
MetroMPG (09-14-16)
Old 08-22-16, 12:49 AM   #9
Lurking Renovator
 
Join Date: Nov 2015
Location: Pardubice, Czech Republic
Posts: 25
Thanks: 11
Thanked 4 Times in 3 Posts
Default

In fact I've read your thread few months ago and you've been one of my inspirations for my mod. So thank you for that!

Unfortunately due to my laziness and space constraints I couldn't afford outside insulation
JimiQ is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 08-22-16, 04:23 AM   #10
Supreme EcoRenovator
 
Join Date: Sep 2012
Location: Vancouver Island,Canada.
Posts: 1,036
Thanks: 116
Thanked 99 Times in 86 Posts
Default

The majority of the savings will be saved from the insulation on the bottom of the fridge , it gets way to warm down there to not be insulated. A design flaw really.

__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
ecomodded is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 03:38 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO
Ad Management by RedTyger
Inactive Reminders By Icora Web Design