An Experimental Investigation of Pressure Drop and Heat Transfer in an In-Tube Condensation System of Pure Ammonia

Vollrath, J.E.; Hrnjak, P.S.; Newell, T.A.

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https://hdl.handle.net/2142/13410 Copy

Description

Title

An Experimental Investigation of Pressure Drop and Heat Transfer in an In-Tube Condensation System of Pure Ammonia

Author(s)

• Vollrath, J.E.
• Hrnjak, P.S.
• Newell, T.A.

Issue Date

2003-10

Keyword(s)

• pressure drop
• heat transfer
• ammonia
• R-22
• two-phase condensation tests

Abstract

Pressure drop and heat transfer measurements were taken for smooth and internally enhanced aluminum test sections using pure R22 and ammonia. Two-phase condensation tests were conducted in the horizontallyoriented test sections. Inside diameters for the two test sections were measured at 7.52 mm (0.3”). The test conditions included mass fluxes from 20 to 270 kg/m2-s (15 to 199 klbm/ft2-hr), inlet qualities of 0 to 95%, and test section heat fluxes from 2.0 to 10.0 kW/m2 (635 to 3175 Btu/ft2-hr). The majority of the two-phase experiments were run at an inlet temperature of 35 °C (95 °F) with a few points taken at saturation temperatures of 40 – 53 ºC (104 – 127 °F). The data is compared to pressure drop and heat transfer correlations to help explain the characteristics of the two test sections. Experimental data showed an average increase of pressure drop by a factor of 1.4 for the enhanced test section regardless of mass flux or quality. Heat transfer data showed a decreased heat transfer coefficient in the enhanced test section. When coupled with the area enhancement, the enhanced test section

Publisher

Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.

Series/Report Name or Number

Air Conditioning and Refrigeration Center CR-51

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/13410

Sponsor(s)/Grant Number(s)

ASHRAE TC1.3; Project 1207-TRP

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