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TECHNICAL PAPERS

Interaction Between Secondaries in a Thermal-Hydraulic Network

[+] Author and Article Information
Weihua Cai, Mihir Sen, K. T. Yang, Rodney L. McClain

Hydronics Laboratory, Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN 46556

Walfre Franco

Beckman Laser Institute and Medical Clinic, University of California, Irvine, CA 92612

Gregor Arimany

Department of Civil Engineering and Geological Sciences, University of Notre Dame, Notre Dame, IN 46556

J. Dyn. Sys., Meas., Control 128(4), 820-828 (Jan 16, 2006) (9 pages) doi:10.1115/1.2363411 History: Received July 21, 2005; Revised January 16, 2006

The design of one secondary loop of a complex network often neglects the effect that its operation has on the others. The present is a study of hydrodynamic and thermal interaction between secondaries in a thermal-hydraulic network as the system goes from one steady state to another. Experimental results are related to those derived from a mathematical model. The network consists of a primary and three secondary loops. There is a water-to-water heat exchanger on each secondary, with the cooling coming from the primary and the heating from a separate loop. A step change is introduced by manually actuating a valve in one of the secondaries, resulting in changes in the other loops also. The response time of the temperature is found to be an order of magnitude higher than that of the flow rate, which is again an order of magnitude higher than the pressure difference. The steady-state results show that there is significant interaction, and that it is dependent on the initial operating condition. The hydrodynamic and thermal responses are found to be very different.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of experimental facility. a, b, and c are secondary loops

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Figure 2

Pressure wave in loop a

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Figure 3

Transient pressure difference in loop a

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Figure 4

Transient outlet temperature on the cooling side of loop a. Bar indicates rms difference between raw and smoothed signal.

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Figure 5

Transient flow rates in loop a and b; -엯- n=1, -◻- n=2; dashed-dotted line: loop a; solid line: loop b

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Figure 6

Change of pressure difference versus change of flow rate in an actuating loop

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Figure 7

Change of flow rate in responding loops versus change of flow rate in an actuating loop

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Figure 8

Schematic of simplified loop

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Figure 9

Change of temperature difference in an actuating loop versus that of the flow rate

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Figure 10

Change of temperature difference in responding loops versus that of the flow rate in actuating loop

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Figure 11

Change of heat rate in an actuating loop versus that of the flow rate

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Figure 12

Change of heat rate in responding loops versus change of flow rate in an actuating loop

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