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Gas-fueled cooling systems are economical, easy to
manage, and save energy and space. The growing reputation of this
clean technology is helping to widen its use in office buildings,
shopping centers, schools, hospitals, etc. and gas district heating
and cooling systems. Recently, an absorption type system and GHP
with power generation, which use the exhaust heat of cogeneration
systems, have been developed, and this is expected to lead to expansion
of the system.
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National energy policy is also helping to drive the uptake of gas
air conditioning. One reason is the ability of the gas systems to
significantly reduce demand for electricity during the summer peak.
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Reduction
in seasonal fluctuations of gas demand due to
increased use of gas air conditioning
･ Comparison of gas sales in different
months
(peak month = 100) |
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･ Breakdown
of uses of gas cooling, by application |
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Effectiveness of gas air
conditioning in suppressing demand for
electricity in summer |
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Power use of ordinary electrical cooling system
(when used in summer) |
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Electricity use of gas cooling system
(when used in summer) |
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| Hotel |
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| Domed baseball
stadium |
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Gymnasium |
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District
heating and cooling (Nagoya) |
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| Absorption chiller
for DHC |
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GHPs use little electricity,
and they can be controlled individually. |
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Commercial complex |
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School |
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･ Spread of gas air conditioning
(installed units)
Cooling capacity (thousand kW)
(Numbers in parentheses are thousand RT*) |
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| *RT (refrigeration ton): 1RT
is the amount of heat that has to be removed to convert 2,000 pounds
(907kg) of waterat 0｡C (32｡F) to 2,000 pounds of ice at 0｡C (32｡F)
in 24 hours. |
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Absorption type
These systems utilize the vaporization heat of water to make
chilled water, and perform a repeated cycle of water evaporation,
absorption, regeneration, and condensation. Using water for
refrigerant and lithium bromide for absorbent, they are environment-friendly
air conditioners that make absolutely no use of chlorofluorocarbons.
They apply the heat of gas to condense and regenerate the absorbent. |
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GHP type
Generally speaking, when a liquid vaporizes, it removes heat
from the surrounding space. Conversely, when a gas is condensed
and liquefied, it generates heat. This property is applied to
cool and heat space by a repetitive process of compressing refrigerant
with a compressor and mechanically liquefying and gasifying
it. Gas heat pumps (GHPs) are systems that use a gas engine
to drive the compressor. |
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