Pinputoperations Pinputlifestyle Poutputhull+shield (J $steel rad 6.i2 electrical power input for colony operations (does not include pthermal) electrical power input for inhabitants's needs power output to space by radiation from hull through shield equivalent temperature of external radiator area of external radiator ernrnissivity of external radiator surface Stefan-Boltzmann constant 5.74xlo-8 watts/m2-(°K)4 mass of external radiator area density of aluminum radiator area density of steel radiator VI.I.2: DESCRIPTION OF RANKINE HEAT PUMP CYCLE The temperature versus entropy and pressure versus enthalpy diagrams for the ideal Rankine heat pump cycle are shown in Figure 6.Il. The cycle applies four processes to a referigerant in a closed loop. In state 1, the refrigerant is a saturated vapor at pressure p 1 and temperature T 1 . It is first isentropically compressed to a superheated vapor at pressure p 2 and temperature T 2 (state 2). The refrigerant is the cooled and condensed to state 3, a saturated liquid at temperature T 3 . The pressure p 2 remains constant during this process. The refrigerant is then further cooled by isenthalpic expansion through a throttling valve to pressure p 1 and temperature T 1 , and becomes a liquid-vapor mixture (state 4). Finally, it passes through an evaporator to absorb heat from the
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