Aspects of Green Hospital Approaches with a Focus on Developing ...

In the compression process the gas is compressed by the piston while the displacer is at
the top <strong>of</strong> the cylinder [6]. The temperature Tc is constant during this process because
Figure 3: Compression process [6]
the gas is cooled. The green area under the P-V curve marks the required work W1-2.
Process 2-3 is isochore <strong>with</strong> an inner heat transport from the regenerator. During this
process no work is done. The following process 3-4 is an isothermal expansion. TH is
constant again and W3-4 is done by the system [6].
Figure 5 shows the two isochore processes. In process 2-3 heat is added and in 4-1 heat
is removed from the gas over the regenerator.
Figure 4: Expansion process [6]
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