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1. INTRODUCTION
1.5.3 Platen Munters cycle
To some extend the Platen Munters cycle is similar to the Carré cycle with
the ammonia/water working media pair. One important difference is
that the total pressure in the Platen Munters cycle is the same throughout
the whole system. This is possible because a third working medium, an
inert gas (hydrogen), is used together with the refrigerant (ammonia) and
the absorbing medium (water).
Figure 1.3: Diagram of Platen Munters cycle. The generator is the same as a desorber. Diagram
downloaded from [26].
The following description refers to the diagram in figure 1.3. The
temperature in the condenser where pure ammonia vapor condenses
determines the pressure of the system, e.g. 12 bars at approximately
30 ◦ C. The condensed ammonia is sent to the evaporator (point 2). In
the evaporator the liquid ammonia is mixed with hydrogen (point 4) and
the partial pressure of ammonia drops which makes it evaporate.
The gas mixture of ammonia and hydrogen is sent to the absorber
(point 3). The ammonia is absorbed by a poor ammonia water solution
(poor in ammonia, entering at point 6) and the hydrogen is sent back to
the evaporator (point 4).
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