chemicalENG

12-01-2015, 04:14 PM

If the condensing temperature and evaporating temperature is constant but the power of the compressor ( driven by gas turbine ) changed . Can be assume that the coefficient of performance is constant ?

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chemicalENG

12-01-2015, 04:14 PM

If the condensing temperature and evaporating temperature is constant but the power of the compressor ( driven by gas turbine ) changed . Can be assume that the coefficient of performance is constant ?

Rob White

12-01-2015, 04:49 PM

.

No.

The coefficient is a calculation of the energy imparted through the

compression process divided into the energy absorbed or rejected

through the heat exchanger.

COP = RE/WD

COP = THR/WD

RE being refrigeration effect, heat absorbed by evap.

THR being total heat rejected in cond.

WD being work done in compression process.

Rob

.

No.

The coefficient is a calculation of the energy imparted through the

compression process divided into the energy absorbed or rejected

through the heat exchanger.

COP = RE/WD

COP = THR/WD

RE being refrigeration effect, heat absorbed by evap.

THR being total heat rejected in cond.

WD being work done in compression process.

Rob

.

chemicalENG

12-01-2015, 05:20 PM

.

No.

The coefficient is a calculation of the energy imparted through the

compression process divided into the energy absorbed or rejected

through the heat exchanger.

COP = RE/WD

COP = THR/WD

RE being refrigeration effect, heat absorbed by evap.

THR being total heat rejected in cond.

WD being work done in compression process.

Rob

.

ok

If coefficient of performane is 2 . It means the refrigerant removes 2 units of heat for each unit of energy consumed , right ?

So If the work input is 1 kW the refrigeration effect is 2 kW

Now , if the work input 2 kW , is the refrigeration effect will be 4 kW ??

If that true , It means that the coefficient of performance is constant ????

No.

The coefficient is a calculation of the energy imparted through the

compression process divided into the energy absorbed or rejected

through the heat exchanger.

COP = RE/WD

COP = THR/WD

RE being refrigeration effect, heat absorbed by evap.

THR being total heat rejected in cond.

WD being work done in compression process.

Rob

.

ok

If coefficient of performane is 2 . It means the refrigerant removes 2 units of heat for each unit of energy consumed , right ?

So If the work input is 1 kW the refrigeration effect is 2 kW

Now , if the work input 2 kW , is the refrigeration effect will be 4 kW ??

If that true , It means that the coefficient of performance is constant ????

Rob White

12-01-2015, 06:08 PM

ok

If coefficient of performane is 2 . It means the refrigerant removes 2 units of heat for each unit of energy consumed , right ?

So If the work input is 1 kW the refrigeration effect is 2 kW

Now , if the work input 2 kW , is the refrigeration effect will be 4 kW ??

If that true , It means that the coefficient of performance is constant ????

OK, sorry in that context "yes".

COP is a ratio, nothing more so inputs and outputs can change but

the ratio could remain constant.

Rob

.

If coefficient of performane is 2 . It means the refrigerant removes 2 units of heat for each unit of energy consumed , right ?

So If the work input is 1 kW the refrigeration effect is 2 kW

Now , if the work input 2 kW , is the refrigeration effect will be 4 kW ??

If that true , It means that the coefficient of performance is constant ????

OK, sorry in that context "yes".

COP is a ratio, nothing more so inputs and outputs can change but

the ratio could remain constant.

Rob

.

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