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Thermodynamic analysis of two air conditioning systems with ice thermal storage in Egypt

  • Mohamed Elhelw
  • Wael M. El-MaghlanyEmail author
Article
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Abstract

An evaluation of using a thermal storage system utilized with air conditioning cycle in Egypt is the main aim of this paper. This study includes the addition of an energy storage system to two types of air conditioning systems: an all-air (AHU) and an all-water (FCU) air conditioning system. The exergy analysis is based on the transient analysis for a conventional cycle and a proposed ice storage cycle for the administration (FCU) and control (AHU) buildings in the New Abu-Qir Thermal Power Plant in Alexandria, Egypt, and it is presented as a case study. Results revealed that a significant increase in the system COP can be observed. The proposed ice storage cycles accomplish a 2.784 average coefficient of performance for the administration building and a 2.811 for control building, whereas the conventional system’s COP is 2.593 and 2.617 for both buildings, respectively. The ice storage tank can supply cooling for 8 h for the administration and control buildings. As a result, the ice storage systems save 53,517 kW h year−1 (6.88% power saving) for the administration building and 55,716 kW h year−1 (6.89% power saving) for the control building in 360 working days within the year (8640 h).

Keywords

Ice thermal storage Exergy analysis Exergy destruction Power saving Air conditioning 

List of symbols

Cv

Specific heat at constant volume, kJ kg−1 °C−1

h

Enthalpy, kJ kg−1

m

Mass, kg

m°

Mass flow rate, kg s−1

Q

Heat transfer rate, kW

s

Entropy, kJ kg−1 °C−1

t

Time, s

T

Temperature,  °C

uif

Latent heat of fusion, kJ kg−1

W

Power, kW

Subscripts/Abbreviations

1

Refrigerant point leaving evaporator and entering compressor

2

Refrigerant point leaving compressor and entering condenser

3

Refrigerant point leaving condenser and entering expansion valve

4

Refrigerant point leaving expansion valve and entering evaporator

5

Water point exit from heat exchanger

6

Water point entering heat exchanger

a

Refrigerant point leaving evaporator and entering compressor in ice storage system

b

Refrigerant point leaving compressor and entering condenser in ice storage system

c

Refrigerant point leaving condenser and entering expansion valve in ice storage system

d

Refrigerant point leaving expansion valve and entering evaporator in ice storage system

Admin

Administration

Comp

Compressor

Cond

Condenser

COP

Coefficient of operation

Ev

Evaportator

ex

Exit

Exp

Expansion valve

HE

Heat exchanger

i

Ice

in

In

O

Ambient

r

Refrigerant

UN

United nations

w

Water

Notes

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or no-profit sectors.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Department of Mechanical Engineering, Faculty of EngineeringAlexandria UniversityAlexandriaEgypt

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