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Research Papers: Energy Systems Analysis

Modeling of a Refrigerator in Disaster Vehicle, Using Solar Energy and Engine Exhaust Gases Heat

[+] Author and Article Information
Shahram Derakhshan

School of Mechanical Engineering,
Iran University of Science and Technology,
Tehran 16846, Iran
e-mail: shderakhshan@iust.ac.ir

Alireza Yazdani

School of Mechanical Engineering,
Iran University of Science and Technology,
Tehran 16846, Iran

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 8, 2015; final manuscript received April 9, 2016; published online June 14, 2016. Assoc. Editor: Mohamed A. Habib.

J. Energy Resour. Technol 138(5), 052008 (Jun 14, 2016) (10 pages) Paper No: JERT-15-1300; doi: 10.1115/1.4033586 History: Received August 08, 2015; Revised April 09, 2016

In critical situations such as floods and earthquakes, the relief forces require a refrigeration for pharmaceuticals and vaccines, which could operate without an electrical energy and the alternative energies, such as solar energy, engine exhaust gases heat, and wind energy. In this paper, a refrigeration cycle has been modeled as an adsorption refrigeration cycle with an activated carbon/methanol as adsorbent/adsorbate pair and two sources of energy—solar energy and engine exhaust gases heat. The solar cycle had a collector with area of 1 m2 and the exhaust gas cycle included a heat exchanger with 100 °C temperature difference between inlet and outlet gases. The temperature profile in adsorbent bed, evaporator, and condenser was obtained from modeling. Moreover, the pressure profile, overall heat transfer coefficient of collector and adsorbent bed, concentration, and the solar radiation were reported. Results represented the coefficient of performance (COP) of 0.55, 0.2, and 0.56 for complete system, solar adsorption refrigeration, and exhaust heat adsorption refrigeration, respectively. In addition, exhaust heat adsorption refrigeration has a value of 2.48 of specific cooling power (SCP). These results bring out a good performance of the proposed model in the climate of Iran.

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Figures

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Fig. 1

Schematic view of the adsorption process on the Clapeyron diagram

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Fig. 2

The incident solar radiation on collector

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Fig. 3

Change in the overall heat transfer coefficient of the collector (UL) along the cycle

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Fig. 4

Change in the outer tube wall temperature (Tpw) along the cycle

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Fig. 5

Change in the condenser temperature (Tcond) along the cycle

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Fig. 6

Change in the concentration of methanol (x) in the activated carbon along the cycle

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Fig. 7

Evaporator temperature variation (Teva) with time

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Fig. 8

Pressure variation (P) with time

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Fig. 9

Change in the outer tube wall temperature (Tpw) along the cycle

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Fig. 10

Change in the concentration of methanol (x) in the activated carbon along the cycle

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Fig. 11

Evaporator temperature variation (Teva) with time

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Fig. 12

Change in the condenser temperature (Tcond) along the cycle

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Fig. 13

Pressure variation (P) with time

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