shows variation of coefficient of performance of the combined
system with thermal capacitance ratio (rC = CL/CH) for various
values of temperature ratio (hL = TL/TH) when thermoelectric generator
is located in between the condenser and its ambient. Increasing
capacitance ratio increases coefficient of performance, which is
more pronounced for low values of temperature ratio. It should be
noted that thermal capacitance ratio is associated with heat transfer
ratio (QL/QH) where QL is the heat rejected from the evaporator
and QH is the heat rejected from the condenser. It should be noted
that low values of temperature ratio increases the Carnot efficiency
of the combined system; therefore, coefficient of performance attains
high values with increasing thermal capacitance ratio. However,
small change in temperature ratio alters the coefficient of
performance significantly, which is more pronounced at high
values of thermal capacitance ratio. This indicates that the variation
of the coefficient of performance is not linear function of both
thermal capacitance ratio and temperature ratio. In this case,
increasing heat rejection from the condenser at high temperature
improves coefficient of performance of the combined system. In
addition, this arrangement (high heat rejection from the condenser
at high temperature) increases the thermoelectric generator efficiency,
which contributes to the overall improvement of coefficient
of performance. Small increase in temperature ratio may improve
slightly Carnot efficiency of the combined system; however, if this
situation takes place at large values of thermal capacitance ratio,
coefficient of performance increases significantly despite the fact
that Carnot efficiency of the combined system improves slightly.
Therefore, operating the combined system at high heat rejection
from the condenser to its ambient improves coefficient of performance
of the combined system significantly. This arrangement requires
low condenser ambient temperature.
shows variation of coefficient of performance of the combinedsystem with thermal capacitance ratio (rC = CL/CH) for variousvalues of temperature ratio (hL = TL/TH) when thermoelectric generatoris located in between the condenser and its ambient. Increasingcapacitance ratio increases coefficient of performance, which ismore pronounced for low values of temperature ratio. It should benoted that thermal capacitance ratio is associated with heat transferratio (QL/QH) where QL is the heat rejected from the evaporatorand QH is the heat rejected from the condenser. It should be notedthat low values of temperature ratio increases the Carnot efficiencyof the combined system; therefore, coefficient of performance attainshigh values with increasing thermal capacitance ratio. However,small change in temperature ratio alters the coefficient ofperformance significantly, which is more pronounced at highvalues of thermal capacitance ratio. This indicates that the variationof the coefficient of performance is not linear function of boththermal capacitance ratio and temperature ratio. In this case,increasing heat rejection from the condenser at high temperatureimproves coefficient of performance of the combined system. Inaddition, this arrangement (high heat rejection from the condenserat high temperature) increases the thermoelectric generator efficiency,which contributes to the overall improvement of coefficientof performance. Small increase in temperature ratio may improveslightly Carnot efficiency of the combined system; however, if thissituation takes place at large values of thermal capacitance ratio,coefficient of performance increases significantly despite the factthat Carnot efficiency of the combined system improves slightly.Therefore, operating the combined system at high heat rejectionfrom the condenser to its ambient improves coefficient of performanceof the combined system significantly. This arrangement requireslow condenser ambient temperature.
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