Research Papers

Development and Operationalization of Solar-Assisted Rapid Bulk Milk Cooler

[+] Author and Article Information
Jitender Singh Shekhawat

Mechanical Engineering Department,
Jaipur, Rajasthan 302017, India
e-mail: jitendra.singh@pratap.co.in

Dilip Sharma, M. P. Poonia

Mechanical Engineering Department,
Jaipur, Rajasthan 302017, India

Hemant Raj Singh

Mechanical Engineering Department,
Jaipur, Rajasthan 302017, India

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received August 12, 2018; final manuscript received January 10, 2019; published online February 19, 2019. Assoc. Editor: Ming Qu.

J. Sol. Energy Eng 141(4), 041014 (Feb 19, 2019) (12 pages) Paper No: SOL-18-1374; doi: 10.1115/1.4042524 History: Received August 12, 2018; Revised January 10, 2019

This work aims at providing insight into developmental and operational experience of an innovative milk cooler which uses solar thermal energy for cooling of fresh milk by way of vapor absorption refrigeration system (VARS). The system uses CPC solar collector(s) producing medium temperature that is desired to provide required thermal energy to the generator of VARS. However, mismatch between the time of availability of solar energy and cooling period of milk raises a demand of integrating thermal storage to this system for use of thermal energy at appropriate times. The novelty of this work is the development of experimental setup and its operation as innovative design to meet the requirement and possible model for the industry to operate and grow using the suggested system. The design, while addressing the problem of grass root level people for generation of income, also helps in reducing the carbon footprint of milk industry, and in the world environment as a whole.

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Fig. 4

Schematic diagram of low-temperature water-driven VAM [28]

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Fig. 3

Solar CPC collector installed at the rooftop of Mechanical Department, MNIT Jaipur

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Fig. 2

Experimental setup for solar-assisted rapid milk cooling system

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Fig. 1

Schematic layout of solar-assisted rapid milk cooler system

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Fig. 5

Various modes of operation: (a) direct cooling of milk, (b) charging of hot storage tank, (c) charging of cold storage tank, (d) discharging of hot storage and charging of cold storage, (e) discharging of hot storage and cooling of milk, and (f) discharging of cold storage and cooling of milk; bold line shows fluid flow circuit

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Fig. 6

Measured weather data of experimental site on Apr. 22, 2018

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Fig. 7

(a) Field efficiency of solar CPC collectors during complete test run and (b) instantaneous field efficiency of solar CPC collector during mode 1 (time 12:05 to 13:30)

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Fig. 8

The useful solar heat gain of solar CPC collectors

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Fig. 9

Variation on inlet temperature of various streams entering VAM

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Fig. 10

Cooling capacity produced by VAM during the cooling period

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Fig. 11

Variation in the COP values of VAM during milk cooling period

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Fig. 12

Variation in the overall COP values of system during milk cooling period

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Fig. 13

Milk cooling temperature profile

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Fig. 14

Dust collected on the solar CPC glass tubes



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