Dishwashing: Man vs. Machine

I always held the general impression that using machines and being green were inherently incompatible. When it comes to the battle between dishwasher and man, my friends tend to agree: some said hand washing was definitely greener and some, one of which referenced the "heated dry" function, were torn. However, contrary to popular belief, manual labor, conveniently, may not be the answer.

Collin Dunn did a detailed comparison of EnergyStar dishwashers and hand washing. I've adapted some of his analysis in order to compare hand washing to conventional dishwashers. Water and energy use for hand washing was determined assuming [warm] water use equivalent to that in a dishwasher cycle. For example, 54 dishes (the typical capacity of a dishwasher) washed in 6 gallons of water (the typical amount of water consumed in a dishwasher) means that only 1.75 cups of water from the faucet can be used per dish. If fewer dishes need to be washed, say 27 dishes, then the equivalent water use would be 3.7 cups per dish.

These numbers may seem confusing. Reference Dunn's article for more detailed calculations.

Moral of the story? When you have a large number of dishes piled up, go for the dishwasher. It's usually more efficient in terms of water use. Because energy use is heavily dependent on your type of dishwasher and water heater, comparing the two is a crapshoot. If you turn off heated dry, the odds will probably strongly favor dishwashers. If you only have a few dishes and can't wait to fill up the dishwasher, hand wash them. Below are some ways you can make each method more efficient.

For dishwasher tips, go here. To learn more handwashing tips, try this site. Also, learn why pre-rinsing is bad.

There are also a bunch of studies that back up these findings (and may favor dishwashers even more). Here are a few:

Rodale.

R. Stamminger (2006) at UBonn. 

Kegs or Cans?

College students are known for their inspiring idealism and frugality. Yet, when it comes to our night (or day) time buzz, idealism fades to apathy, and frugality morphs into extravagance. Don't tell me you've never regretfully looked at your account balance on Saturday morning. But, before the buzz hits in and good judgement is still within reach, we can make decisions that  protect both our virtuosity AND our bank accounts.

Inspired by a conversation I had tonight, I decided to look into the pros and cons of cans vs a keg. It may seem like the obvious winner, on both fronts, is a keg. BUT, it's not so simple.

Yes, a keg is reusable. It can serve almost 27,000 12oz beers in it's lifetime. It's constant reuse makes it a great choice. If everyone were using glass cups or reusing Solo cups, it would be a done deal. Unfortunately, Solo cups are not only  used once but are also made of polystyrene (#6), which is next to impossible to recycle. The closest place to Evanston that picks these cups up is in Rolling Meadows (17 mi away). Check your area here.

Aluminum, on the other hand, is practically perfect. While one can requires around 8.5x more energy to produce, each recycled can saves 95% of the energy needed to make a new one. Beer by the can is also a clear winner in terms of cost and convenience (see below)

Prices are based on Keystone Light from Evanston 1st Liquors 3/01/11. Here is a comparison in terms of sustainability. Keep in mind though, that plastic is lighter than aluminum, so it will be less energy intensive to transport.

If you are planning on recycling, cans are the clear winner both Earth and pocket-wise. However, the best choice is always to brew your own beer and reuse old glass bottles. It reduces waste and transportation. If that sounds like a pain, go out and hit the tap (glasses only)!