Research Papers

Improving the Energy Efficiency of Adsorption Chillers by Intensifying Thermal Management Systems in Sorbent Beds

[+] Author and Article Information
Brian K. Paul

School of Mechanical, Industrial and
Manufacturing Engineering,
Oregon State University,
204 Rogers Hall,
Corvallis, OR 97331-6001
e-mail: brian.paul@oregonstate.edu

Kijoon Lee

School of Mechanical, Industrial and
Manufacturing Engineering,
Oregon State University,
204 Rogers Hall,
Corvallis, OR 97331-6001
e-mail: leekij@oregonstate.edu

Hailei Wang

School of Mechanical, Industrial and
Manufacturing Engineering,
Oregon State University,
204 Rogers Hall,
Corvallis, OR 97331-6001
e-mail: hailei.wang@oregonstate.edu

1Corresponding author.

Manuscript received July 19, 2017; final manuscript received August 6, 2017; published online January 25, 2018. Editor: Y. Lawrence Yao.

J. Manuf. Sci. Eng 140(4), 041001 (Jan 25, 2018) (8 pages) Paper No: MANU-17-1457; doi: 10.1115/1.4037606 History: Received July 19, 2017; Revised August 06, 2017

The objective of this study was to develop a strategy for miniaturizing heat exchangers (HXs) used for the thermal management of sorbent beds within adsorption refrigeration systems. The thermal mass of the microchannel heat exchanger (MCHX) designed and fabricated in this study is compared with that of commercially available tube-and-fin HXs. Efforts are made to quantify the overall effects of miniaturization on system coefficient of performance (COP) and specific cooling power (SCP). A thermal model for predicting the cycle time for desorption is developed, and experiments are used to quantify the effect of the intensified HX on overall system performance.

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Fig. 1

Thermal resistances from the fluid through the bed

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Fig. 2

Patterned 3003 aluminum microchannel shim

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Fig. 3

Different header size based on the channel designs (left: microchannel heat exchanger and right: tube-and-fin heat exchanger)

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Fig. 4

Transparent top view of microchannel plate showing fixed boundaries

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Fig. 5

Cross section of commercially available extruded tube (hole diameter = 1.02 mm)

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Fig. 6

Two different unit cells: (a) microchannel unit cell and (b) tube-and-fin unit cell

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Fig. 7

Joint comparison of test coupons using braze paste (left) and clad sheets (right)

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Fig. 8

Fillet size measured by the interferometric microscope

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Fig. 10

Aluminum vacuum brazing cycle

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Fig. 9

Adsorption heat exchanger setup for vacuum brazing in the furnace; (top) top view and (bottom) front view

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Fig. 11

Tube-and-fin unit cell showing a heater placed on top of the tubing (top). A heater was also placed on the bottom surface; tube-and-fin unit cell filled with silica gel prior to being wrapped with the metal mesh (bottom).

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Fig. 12

Test loop showing heat transfer fluid direction

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Fig. 13

ANSYS mesh (right) used for the transient thermal model (left) of the tube-and-fin adsorption heat exchanger

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Fig. 14

Cooling time versus thermocouple position and volumetric flow rates of heat transfer fluid for (a) microchannel heat exchanger and (b) tube-and-fin heat exchanger

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Fig. 15

The modeling and experimental bed temperature at thermocouple 1 versus time for microchannel and tube-and-fin heat exchangers at 0.21 LPM flowrate




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