My father and I are having a debate about Refrigerator Efficincy. My father was taking bottled...
water out of the frig to make it cheaper to run and I had suggested that it runs cheaper by having it more full. My thinking was that the energy used in cooling the items the first time overweighs the efficiency because the opening and closing of the door in an nearly empty frig all the cold air escaped , replsaced by warm air, whereas if the frig is nearly full ...less air to escape , less warm air in, and everything in the frig is cold already and will help retain the colder temperture once the frig door is back closed???
It depends on the initial temperature of the items as you put them in. After they cool enough, the refrigerator barely has to pump any heat out of it.
If I were you, I'd just get an Einstein fridge:
You know...I never considered this, before, but, I agree with your reasoning. It's a basic concept of Physics that denser molecular structures (e.g., water, hard plastic, etc.) retain heat longer than air does. Therefore, the fuller the fridge - as long as the door is kept closed), more efficiently it should run.
Initially, it does seem like this would be the case. Indeed, if you compare a fridge full of water bottles to an empty fridge, the full fridge will tend to retain a colder temperature inside after you open the door and then shut it.
However, think about it this way. When you open the door of either a full or empty fridge, basically the same amount of air will escape out, and that air will be the same temperature in either case. So both fridges would lose the same amount of coolness (i.e. gain the same amount of heat).
How do you reconcile this with one fridge retaining a colder temperature than the other? The specific heat of water is higher than air, or some might say it has more thermal mass. The energy required to remove heat from each medium is given by the formula Q = C*delta-T, but C is different for each medium. So it can take just as much energy to bring a fridge full of water down by 2 degrees as it would take to lower an empty fridge by 5 degrees, for example.
However, these two scenarios are not quite the same. As someone who pays the A/C bill might realize, the cooler you set the thermostat, the more energy it takes to do that. The energy requirement does not just increase linearly as you lower the temperature. It is more than that. This is because as the refrigerant runs through the cooling coils, it absorbs heat more efficiently from a warmer atmosphere.
In summary, you will have to remove the same amount of heat either way, but the refrigerator compressor may actually run less and use less energy when the fridge is slightly warmer on average -- when it is lacking the water bottles. It is very counter-intuitive.
by Mary Wickison 5 years ago
Why shouldn't potatoes be kept in the refrigerator?If I leave them out, they begin to grow or rot. I have read it isn't advisable to keep them in the fridge, but why is this?Photo courtesy of freedigitalphotos.net and Simon Howden
by Jill Kostowskie 8 years ago
How do you keep your children out of the fridge?? Every time I turn around the door is open...
by Matt Dawes 6 years ago
I would like to help, if I can, to answer an age old question! Do you keep your ketchup in the fridge or the cupboard?! I'm going to be brave and start off the votes with...cupboard!
by Beth Perry 4 years ago
Is it normal for cats to make a flying leap into a refrigerator as soon as the door is opened?We have had several cats that could be in the room on the other side of the house, apparently oblivious to everything else, yet the moment one of the family opens the fridge door they come running into the...
by lindacee 6 years ago
Do you get up in the middle of the night and raid the refrigerator?I don't, but after a late night out, I might sneak a snack before going to bed.I've heard that some people "sleep eat" not even realizing they've done it the next morning.
by Christin Sander 5 years ago
What is the easiest way to clean the refrigerator without chemicals?Time to deep clean the fridge again only this time in back someone spilled something that is very sticky and hardened to the glass shelves. I don't like to use cleaning chemicals anywhere food is placed - so what is a good,...
Copyright © 2018 HubPages Inc. and respective owners. Other product and company names shown may be trademarks of their respective owners. HubPages® is a registered Service Mark of HubPages, Inc. HubPages and Hubbers (authors) may earn revenue on this page based on affiliate relationships and advertisements with partners including Amazon, Google, and others.
|HubPages Device ID||This is used to identify particular browsers or devices when the access the service, and is used for security reasons.|
|Login||This is necessary to sign in to the HubPages Service.|
|HubPages Traffic Pixel||This is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.|
|Remarketing Pixels||We may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.|
|Conversion Tracking Pixels||We may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.|