The Sustainability Review - The Hay Box

By Mike Forbes, Co-op Volunteer Writer

When you cook food much of the heat energy from your stove is used to overcome heat loss from your food to it’s surroundings.  Couldn’t we insulate our food so heat isn’t lost as rapidly thereby using less energy to cook it? Definitely.

Rice. Theoretically, once the rice boils the heat energy needed to complete cooking is present.  The heat leaves the rice because the food is insulated poorly. We overcome this loss by turning the burner down low and simmering it for 30-40 minutes, wasting electricity or fuel. 

What if we boiled the rice and then quickly put it in an insulated box where the heat energy couldn’t escape and the rice would then finish cooking? 

The catch is building a box that heat can’t escape from. What I’ve done successfully for years is build various insulated boxes from commonly available items.

I use them primarily for keeping food hot for a LONG period of time and cooking beans, millet and quinoa.  I’ve also been known to use it for steeping grains and preparing yeast in the beer making process…  If I put a hot food into the box I can pull it out 2-4 hours later still piping hot.

The trick to maximizing efficiency is to build a box that has as little air in it as possible with the largest pot you expect to use. My boxes are built from rigid foam insulation with a radiant barrier (shiny aluminum coating toward the inside).  I glue them together with hobby glue or foam adhesive (Natural Abode and MBS both carry non-toxic, low VOC glues that work well).  I put little strips of wood on the inside bottom to keep the hot pots directly off the insulation.  The door is just a rectangle of foam that wedge fits into the box. It is critical to make the door tight fitting, if you put a slight bevel to the door it will create a much better seal.  Using a table saw to make your cuts makes the process very easy and accurate.  Options for dressing up your box cosmetically are endless.  I typically wrap them in wood to make them more visually appealing but for years had a silver box wrapped in duct tape sitting on top my refrigerator.

If you build the box to your largest pot you can still use smaller pots with good success if you add more thermal mass to the box.  I found that filling small jars with hot water works well to eliminate these air spaces.

Currently we are planning on converting one of our kitchen cabinets into a haybox.  We’ll incorporate insulation into the door with the taper fit foam as mentioned earlier.   It is my understanding that this concept is old and that traditionally hay was used in the boxes as insulation, hence the name hay box.

Mike welcomes questions.  He can be reached at mike@technicalrescue.net.

The Sustainability Review – LED and Dimmable Efficient Lighting

By Mike Forbes, Co-op volunteer writer

I’ve owned every sort of efficient lighting that has existed in the recent past. Always I am searching for a dimmable light bulb that closely emulates the standard incandescent light but offers lower energy use. Recently there have been large improvements in design that make these bulbs worth looking at but still there are issues. In this article I’ll talk about what is readily available and my perception of the technology.

First, LED lighting is making a step into lighting market. Until recently LED lights cast a very blue light and were very expensive ($50-$100/bulb). The advantage they have is the lowest energy use and ridiculously long life (50,000 hours+, that’s 5-1/2 years of continuous 24hr/day use). They currently cost approximately $18/bulb and use about ½ the power a compact fluorescent (CFL) does and 80% less than an incandescent. As a bonus, many are dimmable and are not affected by the cold as CFLs can be.

Let’s talk dimming. Incandescent bulbs are known for their smooth dimming, where as CFL and LED bulbs tend to be a bit more “jerky” in their dimming. This is due to the CFL & LED using electronics to control the light output. Older CFLs were horrible at dimming, they’d buzz loudly and cast a purplish, cold light unless they were on full. There is talk out there that you need a special dimmer for CFL/LED bulbs yet Consumer Reports did some testing on this with various bulbs and found no difference in performance.

The newer CFLs don’t buzz as much and dim much smoother but still don’t provide that infinite adjustment that the incandescent does. The light quality is good however on the whiter side. It is common to have the typical warm-up time that most CFLs have in varying degrees, gone is the startup flicker.

I purchased several LED dimmable bulbs and found them to behave and look very similar. There was a slight buzz, noticeable only when your head was next to the lamp, and they exhibited some of the jerky dimming but easily adjustable to various levels. The biggest drawback is that they don’t provide the warm, glow of the incandescent even thought the package claims to provide that color (soft white). I found the color of the bulb to be very cold, similar to the daylight bulbs out there.

Are they worth it? If you are concerned about energy use then you cannot beat the LED. If you are more concerned about nice, warm ambiance of a dimly lit room you might want to pass at this time. If I were looking for lights in my office, workroom, or any place I wanted a good, bright worklight, I’d definitely consider the LED lights. I think you’ll continue to see the price of these lights drop in the near future.

Mike welcomes questions and can be reached at mike@technicalrescue.net