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The Guidant John Rose Minnesota Oval (officially stylized as OVAL), formerly the John Rose Minnesota Oval, is an outdoor ice rink in Roseville, Minnesota, United States. It is claimed to be the largest artificial outdoor skating surface in North America. The facility was constructed from June to December 1993.
Such a system usually runs in ice-making mode for 16 to 18 hours a day and in ice-melting mode for six hours a day. Capital expenditures are minimized because the chillers can be just 40 - 50% of the size needed for a conventional design. Ice storage sufficient to store half a day's rejected heat is usually adequate.
A thermal expansion valve is a key element to a heat pump; this is the cycle that makes air conditioning, or air cooling, possible. A basic refrigeration cycle consists of four major elements: a compressor, a condenser, a metering device and an evaporator. As a refrigerant passes through a circuit containing these four elements, air ...
Children playing ice hockey on a backyard rink in Canada. Many ice rinks consist of, or are found on, open bodies of water such as lakes, ponds, canals, and sometimes rivers; these can be used only in the winter in climates where the surface freezes thickly enough to support human weight. Rinks can also be made in cold climates by enclosing a ...
Thermodynamic heat pump cycles or refrigeration cycles are the conceptual and mathematical models for heat pump, air conditioning and refrigeration systems. [1] A heat pump is a mechanical system that transmits heat from one location (the "source") at a certain temperature to another location (the "sink" or "heat sink") at a higher temperature. [2]
The first skating rink in Frankfurt opened during a patent exhibition in 1882 in the Palmengarten. It covered 520 m 2 and operated for two months; the refrigeration system was designed by Linde, [2] and it was probably the first skating rink where Ammonia was used as a refrigerant. Ten years later, a larger rink was permanently installed on the ...
For a human-powered version, see yakhchal.. When the ambient air temperature drops to a set temperature, a modulating valve allows all or part of the chilled water to by-pass an existing chiller and run through the free cooling system, which uses less power and uses the lower ambient air temperature to cool the water in the system.
Adsorption refrigeration has been extensively researched in recent years because the technology is often noiseless, non-corrosive and environmentally friendly. [5] The heat source for adsorption refrigeration can be fossil fuel , biomass fuel , nuclear fission , geothermal energy , waste heat , or solar thermal energy .