1 Peer-reviewed (refereed or scholarly) journals-Articles are written by experts and are reviewed by several other experts in the field before the article is published in the journal in order to insure the article's quality.
One key component to an efficient walk-in cooler is its insulation. A standard walk-in cooler will have between 2 and 4 inches of Styrofoam insulation within its walls and a rubber sealing gasket around its door to help ensure that it is both airtight and well-insulated against the temperature of the air outside.
Portable evaporative coolers cool a space by evaporating water into the air as a fine cool mist. The system pulls in dry hot air and passes the air through a moist cooling pad. This pad, or cooling media as it's sometimes called, absorbs water from an onboard water reservoir or pan that you'll fill periodically.