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TRG-TRC011-EN 61
period six
Review
notes
and vapor refrigerant then flows into the evaporator pan, from which the
evaporator spray pump continuously pumps the liquid refrigerant to be
sprayed over the tubes. As heat transfers from the chilled water flowing
through the tubes to the cooler refrigerant, the refrigerant boils (vaporizes) and
the resulting refrigerant vapor is drawn into the absorber.
Inside the absorber, the refrigerant vapor is absorbed by the lithium bromide
solution, releasing heat to the cooling water which is circulated through the
tubes. Absorption of the refrigerant vapor creates a low pressure area within
the absorber, inducing a continuous flow of refrigerant from the evaporator to
the absorber. The absorber spray pump mixes concentrated absorbent
solution (returning from the generator) with dilute solution (from inside the
absorber) and delivers this intermediate solution to the absorber sprays. The
lithium bromide solution becomes diluted as it absorbs the refrigerant. To
complete the cycle, the generator pump continuously returns the dilute
absorbent solution to the generator to be reconcentrated. This cool dilute
solution passes through a heat exchanger to be preheated by the hot
concentrated solution returning from the generator.
Period Two discussed the various types of absorption water chillers, including
the single-effect, double-effect, and direct-fired chillers.
The double-effect absorption chiller includes the same basic components as the
single-effect chiller, and also includes an additional generator, heat exchanger,
and pump. The high-temperature generator can use steam or a hot liquid such
as water as the energy source (indirect-fired) or the combustion of a fossil fuel
such as natural gas or oil as the energy source (direct-fired).
This period also introduced the use of the direct-fired absorption chiller/heater
to provide both cooling and heating.
Figure 70