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Heat and Mass Transfer

, Volume 55, Issue 2, pp 281–291 | Cite as

Thermodynamic analysis of a system converted from heat pump to refrigeration device

  • Faraz AfshariEmail author
  • Sendogan Karagoz
  • Omer Comakli
  • Hadi Ghasemi Zavaragh
Original
  • 158 Downloads

Abstract

In this study, an existing laboratory heat pump is converted to a refrigeration unit in order to evaluate efficiency, power consumption, pressure and temperature variations and optimal charge amount of the system in new mode using refrigerant R-407C. Refrigerant charge amount has a key role in the terms of performance, operating cost (regarding to the charge reduction and energy consumption) and environmental concerns in all heat pump and refrigeration systems, which work on the same principles. Heat pump charge amount is the subject of many research, but less studies have been done in the case of refrigerators and freezers where the system works in the transient condition, on the contrary to the heat pump units. Although this study has been devoted to a detailed attempt to examine the possibility of converting the heat pump into the refrigerator, energy aspects of the whole system and the compressor have been analyzed under different working conditions. In the installed setup, the COP value of the system is tested with charge amount between 1 kg and 7 kg, but obtained results show that, this value is so lower than that of heat pump unit due to restricted energy source in cooling chamber.

Keywords

Refrigerator Heat pump Efficiency COP Refrigerant R-407C 

Nomenclature

COP

Coefficient of performance.

COPh

Heating COP.

COPL

Cooling COP.

cp

Specific heat capacity (J kg−1 K−1).

cos∅

Power factor.

GWP

Global warming potential.

h

Enthalpy (kJ kg−1).

I

Electric current (A).

k

Ratio of specific heats (k = Cp Cv−1).

\( \dot{\mathrm{m}} \)

Mass flow rate (kg s−1).

m

Mass (kg).

n

Polytrophic exponent.

ODP

Ozone depletion potential.

P

Pressure (kPa).

\( \dot{Q} \)

Heat transfer rate (W).

R

Individual gas constant (kJ kg−1 K−1).

s

Entropy (kJ kg−1 K−1).

t

Time (s).

T

Temperature (°C).

U

Voltage (V).

Uc

Uncertainty.

V

Volume (m3).

\( \dot{W} \)

Power consumption rate (W).

W

Power consumption (kJ).

η

Efficiency.

Subscripts

a

Air.

ave.

Average.

comp

Compressor.

cond

Condenser.

CV

Control volume.

evap

Evaporator.

ex

Exergetic.

gen

Generated.

id

Indicated.

in

Inlet.

ise

Isentropic.

mech

Mechanical.

mo

Motor.

out

Outlet.

r

Refrigerant.

w

Water.

Notes

Acknowledgments

This project has been supported by Research Project Foundation (Project No. BAP-2013-105) of the Ataturk University. The authors gratefully acknowledge the support of this research.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Faraz Afshari
    • 1
    Email author
  • Sendogan Karagoz
    • 2
  • Omer Comakli
    • 2
  • Hadi Ghasemi Zavaragh
    • 3
  1. 1.Department of Mechanical EngineeringErzurum Technical UniversityErzurumTurkey
  2. 2.Department of Mechanical EngineeringAtatürk UniversityErzurumTurkey
  3. 3.Department of Mechanical Engineering, Faculty of Al-ghadir, Zanjan BranchTechnical and Vocational University (TVU)TehranIran

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