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外文文献翻译
(含：英文原文及中文译文)
文献出处： Deonarine Balen. CENRTRAL COOLING AND HEATING [J]. Clinical
Science, 2015, 8(3):427-434.
英文原文
CENRTRAL COOLING AND HEATING
Deonarine Balen
The energy used to heat and cool many buildings often comes from a central
location in the facility. The energy input may be combination of electricity, oil ,gas ,
coal ,solar ,geothermal ,etc. This energy is typically converted into hot or chilled
water or steam that is distributed throughout the facility for heating and air
conditioning (cooling). Centralizing this function keeps the conversion equipment
in one location and distributes the heating and cooling in a more readily usable
form. Also, a central cooling and heating plant provides higher diversity and
generally operates more efficiently with lower central location and a potentially
large distribution system.
This lesson addresses the design alternatives that should be considered when
centralizing the cooling and heating sources in a facility.
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The economics of these systems require extensive analysis. Boilers, gas, steam,
and electric turbine-driven centrifugal refrigeration units; and absorption chillers
may be installed in combination in one plant. In large buildings with core areas
that require cooling and perimeter areas require heating, one of several heat
reclaim systems may heat the perimeter to save energy .
The choice of equipment for a central heating and cooling plant depends on
the following:
●Required capacity and type of use
●Cost and types of energy available
●Location and space for the equipment room
●A stack for any exhaust gases and its environment impact
●Safety requirements for the mechanical room and surrounding areas
●Type of air distribution system
●Owning and operating costs
Many electric utilities impose very high charges for peak power use or,
alternatively, offer incentives for off-peak use. This policy has renewed interest in
both water and ice thermal storage .The storage capacity installed for summer
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