What Is WGBT?
WGBT initializes “Wet-bulb Globe Temperature.” It considers how temperature, wind speed, humidity, and infrared radiation (usually sunlight) affect your body to create a perceived temperature. In a way, you already know this shit. It’s common sense, really.
Temperature
Thermostats in houses got folks thinkin’ about temp only, like it’s the most important thing. Then when they move into vans and RVs, they can focus too much on heatin’, coolin’, and what the thermometer and weather report say. Gotta think bigger!
Wind Speed
A breeze generally cools ya down. Unless ya just came out from AC and hit a hot wind. The same is true for your van.
Wanna keep the van feelin’ cooler on a hot day? Look for a breezy spot. Cold day? Park outta the wind.
Then of course, think on roof vent fans. If ya wanna get cooler, get fans blowin’ the air around. That’s what they’re for!
Humidity
Moist air makes the hot feel hotter and the cold feel colder. Vanholio’s walked around in dry, Colorado air at 20 F, comfy in just a sweatshirt. Same temps in Maine such that he can’t seem ta get enough clothes on!
Here’s where them roof vent fans, open windows, and anything that improves air circulation helps keep comfy. They’ll keep your own breath an’ cookin’ moisture from buildin’ up inside the van. Plus, if ya pull in extra moisture, say by gettin’ in the van all wet, fans’n such’ll dry things out and blow the wet outside.
Flip side is that if you’re in hot, dry places, ya can add moisture – spritz yourself with water, wet your sheets, hang a wet towel by the fan – to suck in extra heat from the air. It’s like a cheap swamp cooler.
Infrared Radiation (Sunlight)
Ya got enough brains to sit in the shade on a hot day? Good! Do the same with your van.
Put up reflectors, awnings, and tarps. If ya can park under a tree or in the shade of a cliff or buildin’ on a hot day, awesome. Go north in summer to where the sun is less strong, if ya can. Camp on the east side of a mountain so the sun disappears earlier.
In winter, go to sunny places if ya can. Park in the open. Point your van’s nose south so that the front windows are like a greenhouse. Park on the south side of a buildin’ or cliff where you’ll get sun and the wall behind’ ya gets all warmed up.
Let’s Think Bigger Yet!
Now that you’ve dipped your toe, check out some a these articles on low-tech, old-fashioned ways folks kept warm and cool – without throwin’ energy-intensive heaters and AC at it. Then apply their lessons to your van life.
- Restoring the Old Way of Warming: Heating People, Not Places (Low-Tech Magazine)
- Insulation: First the Body, Then the Home (Low Tech Magazine)
- The Revenge of the Circulating Fan (Low Tech Magazine)
- A Passively Cooled House in the Tropics (No Tech Magazine)
- Movable Shading Structures (No Tech Magazine)
- 20 Ways to Stay Cool Without Power (Urban Survival Site)
- How Homes Kept Cool Before the Age of AC (Solar City)
- Stay-cool Strategies from the Old School — and a Few New Ones, Too (Washington Post)
Hey, Beer Vanholio! He works hard on this blog.
Also See ...
Why You Need 2 Roof Vent Fans on Your VanGreenhouse for Winter Van Life Warmth
Reflectix Insulation in Vans Done Right
There's the primary mental adjustment some people refuse to make: You're not living in a building anymore, so stop trying to control temperature the way you would in a building.
ReplyDeleteWell said! Gotta go back to first principles in this an so many other areas. The goal is to keep yourself at a good temperature, not the vehicle. But folks get confused on that point because the last 100 years has been focused on keepin' the body comfy by controlling the house temp. That's only one way, and an expensive one at that.
DeleteI shoulda cross-linked this old post, too: http://www.vanholio.com/2016/07/acclimatize-for-comfort-in-all-weather.html.