4. From two permeability tests it is found that the void ratio and hydraulic conductivity of a normally consolidated clay are 1.
45 and 0.7x10-7 cm/sec respectively, and 1.55 and 1.55 x 10-7 cm/sec respectively. Estimate the permeability coefficient at a void ratio of 1.5. Use Samarasinghe, Huang and Drenevich relationship
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A binary geothermal power operates on the simple Rankine cycle with isobutane as the working fluid. The isentropic efficiency of the turbine, the net power output, and the thermal efficiency of the cycle are to be determined
Assumptions :
1. Steady operating conditions exist.
2. Kinetic and potential energy changes are negligible.
Properties: The specific heat of geothermal water ( [) is taken to be 4.18 kJ/kg.ºC.
Analysis (a) We need properties of isobutane, we can obtain the properties from EES.
a. Turbine
P
=
b. Pump
c.