Condensation heat transfer and pressure drop of NH3 and NH3/H2O within a plate heat exchanger

Toa, X.; Dahlgren, Elias; Infante Ferreira, C.A.

Condensation heat transfer and pressure drop of NH₃ and NH₃/H₂O within a plate heat exchanger

Conference paper (2019)

Authors

X. Toa Engineering Thermodynamics - Mechanical, Maritime and Materials Engineering

Elias Dahlgren

C.A. Infante Ferreira Engineering Thermodynamics - Mechanical, Maritime and Materials Engineering

Research Group

Engineering Thermodynamics (Mechanical, Maritime and Materials Engineering) (TU Delft)

Pressure drop Heat transfer Absorption Condensation Plate heat exchanger NH O/HO

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Published Date

2019

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Research Group

Engineering Thermodynamics

Abstract

The heat transfer coefficients (HTCs) of NH₃ are higher than of HFCs and hydrocarbons during the condensation within plate heat exchangers (PHEs) mainly due to its favorable transport properties. NH₃/H₂O has a large temperature glide, and its heat transfer is dependent on mass transfer. Few models have been specifically developed for NH3 and NH₃/H₂O condensation in PHEs. This paper presents heat transfer and pressure drop experiments for partial condensation. The calculation method for condensation HTCs and frictional pressure drop is introduced. The working fluids are pure NH₃ and NH₃/H₂O with a weight concentration of 96%. For a mass flux of 62 kgm^-2s^-1, the HTCs of NH3 increase from 10 to 20 kWm^-2K^-1 with vapor quality. The apparent HTCs of NH₃/H₂O are significantly lower than NH₃ at high vapor qualities because of mass transfer resistance. Condensation pressure level has a slight influence on HTCs and frictional pressure drop.