Thread Number: 11772
Dishwasher Performance Tests
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Post# 209679   5/12/2007 at 11:29 (6,192 days old) by hometechdoc ()        

Some of you asked for pictures of an actual lab dealig with clothes washers or dishwashers. Here goes. One of the last labs of the sememster is the dishwahsr performance lab. The students conduct a modified version of an AHAM (Association of Home Appliance Manufacturers) performance procedure for assessing the dishwashers. It is an old test written when dishwashers used lots of water and water pressure. It is very similar to what Consumers Union uses for their tests published in Consumers Report




Post# 209680 , Reply# 1   5/12/2007 at 11:32 (6,192 days old) by hometechdoc ()        
fat, sugar and starch

One of the samples to be cleaned is a salad plate that has a small portion of a PBJ smeared around on it. Similar to what a small child might do with their sandwich

Post# 209681 , Reply# 2   5/12/2007 at 11:34 (6,192 days old) by hometechdoc ()        
pigment stains

The test calls for a strong brew of tea to be left in cups and some spilt on the saucer. We used coffee as there were no tea bags to be found in the lab that day.

Post# 209682 , Reply# 3   5/12/2007 at 11:37 (6,192 days old) by hometechdoc ()        
starch

Farina (Cream o Wheat) is left in a bowl with a spoon. We use a somewhat deep saucer. What we have is readily available in the lab is a boulion bowl which is too deep for the dishwasher to clean. Most people eat this type of hot cereal in a soup style bowl which would probably clean similarly to our deep plates.

Post# 209683 , Reply# 4   5/12/2007 at 11:38 (6,192 days old) by hometechdoc ()        
pigment anc bulk

juice glasses are soiled with tomato juice

Post# 209684 , Reply# 5   5/12/2007 at 11:39 (6,192 days old) by hometechdoc ()        
close up

close up of the soiled juice glass

Post# 209685 , Reply# 6   5/12/2007 at 11:41 (6,192 days old) by hometechdoc ()        
milk

Milk allowed to dry is somwehat difficult to clean.

Post# 209686 , Reply# 7   5/12/2007 at 11:48 (6,192 days old) by hometechdoc ()        
large plate

The large plate is divided into thirds. One third is a one minute egg (protein), Dinty Moore beef stew (protein, starch, and bulk) and spinach (bulk and fiber). A tablespoon of each is placed in each third and smeared around.

Post# 209687 , Reply# 8   5/12/2007 at 11:50 (6,192 days old) by hometechdoc ()        
Bosch loaded

We use eight place settings in the Bosch Here it is loaded

Post# 209688 , Reply# 9   5/12/2007 at 11:51 (6,192 days old) by hometechdoc ()        
Loaded Fisher and Paykel

The FP only gets four place settings

Post# 209689 , Reply# 10   5/12/2007 at 11:55 (6,192 days old) by hometechdoc ()        
Prepping the FP

The diswashers are all cleaned beforehand. The FP had greasy gunk built up inside. Apparently my lab techician had placed exhaust vent filters in to wash and had not used a high heat settings and the greas just clung to everything. They are also checked for rinse aid. The students are also challanged to find the most similar cyle on all three dishwashers. They are shooting for a five water change cycle and a 150 or so degree main wash

Post# 209690 , Reply# 11   5/12/2007 at 11:58 (6,192 days old) by hometechdoc ()        
loaded Miele

The soiled dishes are allowed to set for 24 hours and then loaded to manufacturers recommendations. Most of the cyles used are close to a normal heavy cycle.

Post# 209691 , Reply# 12   5/12/2007 at 12:00 (6,192 days old) by hometechdoc ()        
Amy says Clean

One student evaluates each item from all three machines. i.e. one student looks at all milk glasses and determines if they are clean or not.

Post# 209692 , Reply# 13   5/12/2007 at 12:02 (6,192 days old) by hometechdoc ()        
clean silverware

The silverware is inspected by the designated students. Notice the fryer from the Miele combi set collection. I love these. I have them in my house as well.

Post# 209694 , Reply# 14   5/12/2007 at 12:04 (6,192 days old) by hometechdoc ()        
dissappointment

The FP did not do so well. I do think that the machines is not performing to its normal level due to the excess grease. I have since ran it through a couple of heavy high temp cyles and it seems to be alright.

Post# 209695 , Reply# 15   5/12/2007 at 12:05 (6,192 days old) by hometechdoc ()        
silverware

Edward and Gil count and inspect silverware

Post# 209696 , Reply# 16   5/12/2007 at 12:07 (6,192 days old) by hometechdoc ()        
unloading the Bosch

Edward unloads the Bosch

Post# 209697 , Reply# 17   5/12/2007 at 12:09 (6,192 days old) by hometechdoc ()        
recording results

Students creadte a grid to determine the percentage of clean dishes. They can then calculate the percentage clean for the total load to determine the winner.

Post# 209698 , Reply# 18   5/12/2007 at 12:11 (6,192 days old) by hometechdoc ()        
glasses

glasses only pass if they are spotless which actually is almost impossible. These glases are not used for any other pupose so they do not have day to day marks on them.

Post# 209699 , Reply# 19   5/12/2007 at 12:13 (6,192 days old) by hometechdoc ()        
spotless

another inspector. Actually she is not doing the inspection correctly. The inspectors areonly supposed to hold the stemmed glassses by the stem so not to interfere with the results.

Post# 209700 , Reply# 20   5/12/2007 at 12:15 (6,192 days old) by hometechdoc ()        
spotless

another inspector

Post# 209702 , Reply# 21   5/12/2007 at 12:25 (6,192 days old) by frigilux (The Minnesota Prairie)        

frigilux's profile picture
Oh.My.God. Testing appliances would be my dream job! Thanks for all the pics and explanations.

Post# 209722 , Reply# 22   5/12/2007 at 16:05 (6,192 days old) by logixx (Germany)        

logixx's profile picture
Thanks for posting those interesting pics!

Here's a video from Miele showing the Euro version of a DW performance test.

Alex


CLICK HERE TO GO TO logixx's LINK


Post# 210167 , Reply# 23   5/15/2007 at 09:37 (6,189 days old) by hometechdoc ()        
Miele video

That is a great video. I had never seen it before. dishwasher performance testing is interesting. However, results are not always consistent.

Post# 210169 , Reply# 24   5/15/2007 at 09:49 (6,189 days old) by logixx (Germany)        

logixx's profile picture
Here are the other videos:

CLICK HERE TO GO TO logixx's LINK


Post# 210170 , Reply# 25   5/15/2007 at 09:52 (6,189 days old) by roto204 (Tucson, AZ)        
Fascinating

roto204's profile picture
That's fascinating, Allen. Thanks for posting that! :-D

Post# 210196 , Reply# 26   5/15/2007 at 13:23 (6,189 days old) by laundryshark (Cedar Rapids, Iowa)        
Thanks for Sharing Dishwasher Demos

Hey Alex:

Thanks for sharing those Miele demos. For the most part, at least I could still clue in on the happenings beyond the background music.

Laundry Shark


Post# 210253 , Reply# 27   5/15/2007 at 19:10 (6,189 days old) by appnut (TX)        

appnut's profile picture
Cool Allen. You know me and dishwashers.

Post# 211945 , Reply# 28   5/23/2007 at 22:04 (6,180 days old) by rp2813 (Sannazay)        
Bosch

rp2813's profile picture
Allen, how did the Bosch do? My sister is thinking of buying one and is coming to me for advice.

Thanks,

Ralph


Post# 211969 , Reply# 29   5/24/2007 at 04:59 (6,180 days old) by logixx (Germany)        

logixx's profile picture
I have a Siemens (Bosch) dishwasher at home and I love it - it cleans amazingly! It can easily handle a Bob-load and still get everything clean. I thinks it's great. :)

Alex


Post# 212019 , Reply# 30   5/24/2007 at 12:41 (6,180 days old) by rp2813 (Sannazay)        

rp2813's profile picture
Thanks Alex, the model she is looking at is: SHU66CO2UC which doesn't come up on the Bosch web site. It's supposedly discontinued and that's why it's priced low. She's going to make the purchase today.

Any interested parties in the LA area will have a KA Superba that I'm guessing is from the 70's up for grabs pretty soon.


Post# 212315 , Reply# 31   5/26/2007 at 04:59 (6,178 days old) by rapunzel (Sydney)        

Hi ya'll,

Just a thought on the F&P drawers. I've got a pair of those and find that a blocked washarm is usually the cause of residue on dishes. Could it be that it got missed when it was loaded up? Judging from the pictures it looks unlikely, but it is hard to tell. Unfortunately it doesn't give a warning, like my old GE used to, when something interferes with the wash mechanism. I can tell by the way it sounds if something interferes with the rotation, but not everyone in my household is so attuned. The few times that it wasn't picked up, most of the dishes still came out surprisingly clean.

The holes in the F&P washarms are quite large in comparison to many other dishwashers and it really seems to move a lot of water under quite a bit of pressure. I've now had it for close to a year and not once have I had to clean out stuff from the spray holes. The large circular filter screen keeps remarkably clean as well. I don't pre-rinse, but scrape off solid food residue before loading them into the machine. The small strainers at the front of each drawer collect small quantities of gunk and they get cleaned out monthly.

Our dirty dishes don't get to sit for 24 hours though. We use both drawers twice daily on average.

Cheers from sunny Cairns



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