A roof is the top covering of a building, including all materials and constructions necessary to support it on the walls of the building or on uprights, providing protection against rain, snow, sunlight, extremes of temperature, and wind. A roof is part of the building envelope.
Freezing rain is rain maintained at temperatures below freezing by the ambient air mass that causes freezing on contact with surfaces. Unlike a mixture of rain and snow or ice pellets, freezing rain is made entirely of liquid droplets. The raindrops become supercooled while passing through a sub-freezing layer of air hundreds of meters above the ground, and then freeze upon impact with any surface they encounter, including the ground, trees, electrical wires, aircraft, and automobiles. The resulting ice, called glaze ice, can accumulate to a thickness of several centimeters and cover all exposed surfaces. The METAR code for freezing rain is FZRA.
Goodison Park is a football stadium in the Walton area of Liverpool, England, 2 miles (3 km) north of the city centre. It has been the home of Premier League club Everton since 1892 and has an all-seated capacity of 39,414.
A central heating system provides warmth to a number of spaces within a building from one main source of heat. It is a component of heating, ventilation, and air conditioning systems, which can both cool and warm interior spaces.
Pittodrie Stadium, commonly referred to as Pittodrie, is an all-seater stadium in Aberdeen, Scotland. Used primarily for football, it has been the home ground of the Scottish Professional Football League (SPFL) club Aberdeen F.C. since they were formed in 1903. Prior to then, the ground hosted the original Aberdeen F.C. from 1899 until the merger that created the present club.
Dens Park, officially known as Kilmac Stadium for sponsorship reasons, is a football stadium in Dundee, Scotland, which is the home of Scottish Premiership club Dundee F.C. and has a capacity of 11,775. Tannadice Park, the home of rivals Dundee United, is just 200 yards away.
Rugby Park, also known as The BBSP Stadium Rugby Park for sponsorship reasons, is a football stadium situated in the Scottish town of Kilmarnock. It was first used in 1899 and is the home of Kilmarnock F.C. Rugby Park has also been used for concerts, with Elton John playing to 15,000. In 2002, the club constructed the Park Hotel, a 4-star hotel complex next to the ground.
In environments containing permafrost, the active layer is the top layer of soil that thaws during the summer and freezes again during the autumn. In all climates, whether they contain permafrost or not, the temperature in the lower levels of the soil will remain more stable than that at the surface, where the influence of the ambient temperature is greatest. This means that, over many years, the influence of cooling in winter and heating in summer will decrease as depth increases.
Electric heat tracing, heat tape or surface heating, is a system used to maintain or raise the temperature of pipes and vessels using heat tracing cables. Trace heating takes the form of an electrical heating element run in physical contact along the length of a pipe. The pipe is usually covered with thermal insulation to retain heat losses from the pipe. Heat generated by the element then maintains the temperature of the pipe. Trace heating may be used to protect pipes from freezing, to maintain a constant flow temperature in hot water systems, or to maintain process temperatures for piping that must transport substances that solidify at ambient temperatures. Electric trace heating cables are an alternative to steam trace heating where steam is unavailable or unwanted.
Victoria Park, also known as the Global Energy Stadium for sponsorship reasons, is an all-seater football stadium in the town of Dingwall, Highland, Scotland. It is the home ground of Ross County, who currently play in the Scottish Premiership.
Stadion Evžena Rošického, also known simply as Strahov, is a multi-purpose stadium in Strahov, Prague in the Czech Republic. It hosted the 1978 European Athletics Championships and for many years this was the venue for main annual international track and field meet of Prague until Stadion Juliska took the role in 2002. Nowadays the stadium is used only for minor domestic athletic competitions and mostly for football matches, although no team plays at the stadium regularly. It served as the home ground for SK Slavia Prague from August 2000 until May 2008 when their new stadium, the Synot Tip Arena, was opened. It is also occasionally used by other Czech teams, and is the usual venue for the Czech Cup final. Currently, it is the home stadium of FK Slavoj Vyšehrad of the Czech National Football League.
Stadion Juliska is a multi-use stadium in Prague-Dejvice, Czech Republic. It is currently used mostly for football matches and is the home ground of FK Dukla Prague.
Lillestrøm idrettspark, colloquially known as Lillestrøm stadion, is a sports facility located at Lillestrøm in Skedsmo, Norway. The main venue is Romerike friidrettsstadion, an athletics stadium with eight all-weather running tracks. It has multiple football pitches, including one with artificial turf and one with gravel. The park features of two arenas, LSK-Hallen with a full-size artificial football pitch and Skedsmohallen for indoor sports. The venue is located adjacent to Åråsen Stadion, the home ground of Lillestrøm SK. The main tenants for Lillestrøm idrettspark are Flisbyen BK and Focus FK in football, and Strømmen IF, Lørenskog FIL and Minerva IS in athletics. The stadium opened on 6 June 1920 and was the main venue for Lillestrøm SK until 1951. The athletics stadium opened two years later. In 2004, the artificial turf pitch was laid and in 2007 a new athletics venue and LSK-Hallen opened.
A ground-coupled heat exchanger is an underground heat exchanger that can capture heat from and/or dissipate heat to the ground. They use the Earth's near constant subterranean temperature to warm or cool air or other fluids for residential, agricultural or industrial uses. If building air is blown through the heat exchanger for heat recovery ventilation, they are called earth tubes.
Underfloor heating and cooling is a form of central heating and cooling that achieves indoor climate control for thermal comfort using hydronic or electrical heating elements embedded in a floor. Heating is achieved by conduction, radiation and convection. Use of underfloor heating dates back to the Neoglacial and Neolithic periods.
Turf management or pitchcare describes the work needed to keep a sporting pitch ready for use. This article looks at the various types of sporting pitches and the type of challenges which they present.
A ground source heat pump is a heating/cooling system for buildings that uses a type of heat pump to transfer heat to or from the ground, taking advantage of the relative constancy of temperatures of the earth through the seasons. Ground source heat pumps (GSHPs) – or geothermal heat pumps (GHP) as they are commonly termed in North America – are among the most energy-efficient technologies for providing HVAC and water heating, using far less energy than can be achieved by burning a fuel in a boiler/furnace or by use of resistive electric heaters.
Soil steam sterilization is a farming technique that sterilizes soil with steam in open fields or greenhouses. Pests of plant cultures such as weeds, bacteria, fungi and viruses are killed through induced hot steam which causes vital cellular proteins to unfold. Biologically, the method is considered a partial disinfection. Important heat-resistant, spore-forming bacteria can survive and revitalize the soil after cooling down. Soil fatigue can be cured through the release of nutritive substances blocked within the soil. Steaming leads to a better starting position, quicker growth and strengthened resistance against plant disease and pests. Today, the application of hot steam is considered the best and most effective way to disinfect sick soil, potting soil and compost. It is being used as an alternative to bromomethane, whose production and use was curtailed by the Montreal Protocol. "Steam effectively kills pathogens by heating the soil to levels that cause protein coagulation or enzyme inactivation."
A direct exchange (DX) geothermal heat pump is a type of ground source heat pump in which refrigerant circulates through copper tubing placed in the ground unlike other ground source heat pumps where refrigerant is restricted to the heat pump itself with a secondary loop in the ground filled with a mixture of water and anti-freeze.
A snowmelt system prevents the build-up of snow and ice on cycleways, walkways, patios and roadways, or more economically, only a portion of the area such as a pair of 2-foot (0.61 m)-wide tire tracks on a driveway or a 3-foot (0.91 m) center portion of a sidewalk, etc. It is also used to keep entire driveways and patios snow free in snow prone climates. The "snow melt" system is designed to function during a storm to improve safety and eliminate winter maintenance labor including shoveling, plowing snow and spreading de-icing salt or traction grit (sand). A snowmelt system may extend the life of the concrete, asphalt or under pavers by eliminating the use of salts or other de-icing chemicals, and physical damage from winter service vehicles. Many systems are fully automatic and require no human input to maintain a snow/ice-free horizontal surface.
