Heat and mass transfer in a falling film absorber of ammonia-water absorption systems

Journal Article · Wed Jul 01 04:00:00 EDT 1998 · Heat Transfer Engineering

DOI:https://doi.org/10.1080/01457639808939926· OSTI ID:665337

Kim, B ^[1]

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1. Hongik Univ., Seoul (Korea, Republic of). Dept. of Mechanical Engineering

For ammonia-water generator-absorber heat exchanger (GAX) systems to work at high coefficient of performance, the heat and mass transfer components have to operate at optimum performance within a narrow range of conditions for the recovery of internal energy. In the present work, an analysis is performed to study the absorption process of an ammonia-water vapor mixture by an aqueous solution of ammonia in a falling film absorber. The combined heat and mass transfer processes involved are analyzed through an integral formulation of the continuity, momentum, energy, and diffusion equations. The effects of vapor flow direction relative to the solution, cooling ability, ammonia concentration of solution and vapor, and interfacial momentum and heat transfer rate on absorption processes are investigated. The characteristics of the absorption process are found to be governed by the relative significance of the mass transfer resistance and the driving forces between the solution film and the vapor mixture.

• Sponsoring Organization: USDOE
• OSTI ID: 665337
• Journal Information: Heat Transfer Engineering, Journal Name: Heat Transfer Engineering Journal Issue: 3 Vol. 19; ISSN 0145-7632; ISSN HTEND2
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ABSORPTION
AIR CONDITIONING
AMMONIA
BINARY MIXTURES
HEAT EXCHANGERS
HEAT PUMPS
HEAT TRANSFER
MASS TRANSFER
RESIDENTIAL BUILDINGS
SPACE HEATING
WATER