I like cool drinks – most energy efficient option

I’m a fan of having my drinks cold, and have been trying to figure out what is the most energy efficient way to do it. As I see it the options are

Leave the bottle in the fridge

This is a good option because the refrigerator is relatively efficient when compared to the freezer.

The drawback (perhaps) is that you will be keeping a large amount of the liquid (lets say pepsi max… I’m not a coke man) cool for a long time, when you really only need it cool at the time your drinking it.

Use ice cubes

Ice-cubes have the benefit of meaning you have less in the fridge, and so are trying to keep less cool. I mean keeping air cool is less challenging than liquid. Also they give greater flexibility on what drink you may want cooled.

The main drawback is that the freezer is relatively less efficient than fridge (since the bigger the difference between room temperature and the target temperature, the more energy required to achieve it)

At the moment I’m beginning to think leaving the bottle in the fridge is the correct option (which I never do), but I’m interested in getting other suggestions.


One Response to I like cool drinks – most energy efficient option

  1. Once a bottle is chilled it doesn’t take any more energy to keep it cool as long as its left in the fridge.

    The amount of energy required to freeze a liquid is enormous compared with dropping it a few degrees. This state change energy is called enthalpy of fusion if I remember my thermodynamics correctly. Since you can’t drink a frozen liquid, why would you use a lot of energy to freeze it and then thaw it out to drink it?

    BTW enthalphy of fusion has an energy storage capability that should be used a lot more is house climate control. For example, glycerol (an unwanted byproduct of biodiesel production) has a freezing/melting point of 19C. It can act as a good heat regulation device at that temperature. I remember reading that it could store as much energy per kg as a lead acid battery for a modest few degrees C change of temperature at little cost and with an infinite number of cycles without degredation.

    Enthalpy of fusion is the reason why a small ice pack can keep a large picnic basket cool for a long time. As the ice melts it absorbs lots of heat without increasing in temperature.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: