Air conditioning

Air conditioning (often referred to as A/C or AC) is the process of altering the properties of air (primarily temperature and humidity) to more comfortable conditions, typically with the aim of distributing the conditioned air to an occupied space such as a building or a vehicle to improve thermal comfort and indoor air quality. In common use, an air conditioner is a device that lowers the air temperature. The cooling is typically achieved through a refrigeration cycle, but sometimes evaporation or free cooling is used. Air conditioning systems can also be made based on desiccants.

In the most general sense, air conditioning can refer to any form of technology that modifies the condition of air (heating, cooling, (de-)humidification, cleaning, ventilation, or air movement). However, in construction, such a complete system of heating, ventilation, and air conditioning is referred to as heating, ventilation, and air conditioning (HVAC -as opposed to AC).

History

The basic concept behind air conditioning is said to have been applied in ancient Egypt, where reeds were hung in windows and were moistened with trickling water. The evaporation of water cooled the air blowing through the window. This process also made the air more humid, which can be beneficial in a dry desert climate. In Ancient Rome, water from aqueducts was circulated through the walls of certain houses to cool them. Other techniques in medieval Persia involved the use of cisterns and wind towers to cool buildings during the hot season.

The Sound

The Sound or The Sounds may refer to:

Geography

Music

Radio

See also

This Old House

This Old House is an American home improvement media brand with television shows, a magazine and a website, ThisOldHouse.com. The television series airs on the American television station Public Broadcasting Service (PBS) and follows remodeling projects of houses over a number of weeks. This Old House is produced by This Old House Ventures, Inc. with WGBH Boston as the PBS distributing station. Warner Bros. Domestic Television distributes the series to commercial television stations in syndication. Time Inc. launched This Old House magazine in 1995, focusing on home how-to, know-how and inspiration. In 2001, Time Inc. acquired the television assets from WGBH Boston and formed This Old House Ventures, Inc.

Overview

This Old House and its sister series Ask This Old House are often broadcast together as The This Old House Hour (originally known as The New This Old House Hour). Both shows are owned by This Old House Ventures, Inc. (a subsidiary of Time, Inc.) and are underwritten by GMC and The Home Depot. Weyerhauser lumber distributor, a previous underwriter, by 1989 had donated more than $1,000,000 a year to the show.This Old House is also underwritten by State Farm Insurance and Lumber Liquidators, Inc. Other underwriters throughout the show's tenure included Parks Corporation, Glidden paints, Montgomery Ward, Ace Hardware, Kohler plumbing, Schlage locks, Century 21 Real Estate, Toro lawnmowers/snowblowers, ERA Real Estate, Angie's List, and Mitsubishi Electrics. Two of the original underwriters were Weyerhauser and Owens-Corning.

Old House

Old House could refer to:

Plastic bottle

A plastic bottle is a bottle constructed from plastic. Plastic bottles are typically used to store liquids such as water, soft drinks, motor oil, cooking oil, medicine, shampoo, milk, and ink. The size ranges from very small sample bottles to large carboys.

History

Plastic bottles were first used commercially in 1947, but remained relatively expensive until the early 1960s when high-density polyethylene was introduced. They quickly became popular with both manufacturers and customers due to their lightweight nature and relatively low production and transportation costs compared with glass bottles. However, the biggest advantage plastic bottles have over glass, is their superior resistance to breakage, in both production and transportation. Except for wine and beer, the food industry has almost completely replaced glass with plastic bottles.

Production

Plastic bottles are formed using a variety of techniques. The choice of material varies depending upon application.