Research Papers

Heat and Mass Transfer Analysis of a Pot-in-Pot Refrigerator Using Reynolds Flow Model

[+] Author and Article Information
Ramendra Pandey

Academy of Scientific and
Innovative Research (AcSIR),
CSIR-National Chemical
Laboratory (CSIR-NCL),
Dr. Homi Bhabha Road,
Pashan, Pune 411008, India
e-mail: ramendra.csir@gmail.com

Bala Pesala

Academy of Scientific and
Innovative Research (AcSIR),
CSIR-Structural Engineering Research
Centre (CSIR-SERC) Campus,
Chennai 600113, India;
CSIR-Central Electronics Engineering
Research Institute,
CSIR Madras Complex,
Chennai Unit,
Taramani, Chennai 600113, India
e-mail: balapesala@gmail.com

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received September 6, 2015; final manuscript received February 9, 2016; published online April 12, 2016. Assoc. Editor: Amir Jokar.

J. Thermal Sci. Eng. Appl 8(3), 031006 (Apr 12, 2016) (9 pages) Paper No: TSEA-15-1254; doi: 10.1115/1.4033010 History: Received September 06, 2015; Revised February 09, 2016

Heat and mass transfer analysis of evaporative cooling process in a pot-in-pot cooling system is done based on Reynolds flow hypotheses. The model proposed herein assumes that the heat transfer due to natural convection is coupled with an imaginary ambient air mass flow rate (gAo) which is an essential assumption in order to arrive at the solution for the rate of water evaporation. Effect of several parameters on the pot-in-pot system performance has been studied. The equations are iteratively solved and detailed results are presented to evaluate the cooling performance with respect to various parameters: ambient temperature, relative humidity (RH), pot height, pot radius, total heat load, thermal and hydraulic conductivity, and radiation heat transfer. It was found that pot height, pot radius, total heat load, and radiation heat transfer play a critical role in the performance of the system. The model predicts that at an ambient temperature of 50 °C and RH of 40%, the system achieves a maximum efficiency of 73.44% resulting in a temperature difference of nearly 20 °C. Similarly, for a temperature of 30 °C and RH of 80%, the system efficiency was minimum at 14.79%, thereby verifying the usual concept that the pot-in-pot system is best suited for hot and dry ambient conditions.

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Fig. 1

Schematic illustration for building a pot-in-pot system

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Fig. 2

Different states in Reynolds flow model

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Fig. 3

Solution procedure for obtaining the temperature

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Fig. 4

(a) Estimated variation in ηth with RH (%). (b) Estimated value of ΔT (T − Tcold) with RH (%).

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Fig. 5

Variation of ΔT and ηth with respect to (a) outer pot radius, (b) pot thickness, and (c) pot height

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Fig. 6

Typical variation in ΔT and ηth with respect to Q˙load

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Fig. 7

Variation in ΔT and ηth with respect to (a) effective thermal conductivity of wet clay and (b) effective thermal conductivity of wet sand

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Fig. 8

Variation in ΔT and ηth with respect to KH

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Fig. 9

Variation in ΔT and ηth with and without Q˙rad




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