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

None, None; None, None; None, None

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

Conference Paper (2019)

Author(s)

Xuan Tao (TU Delft - Mechanical Engineering)

Elias Dahlgren

Carlos Infante Ferreira (TU Delft - Mechanical Engineering)

Research Group

Engineering Thermodynamics

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

DOI related publication

https://doi.org/10.18462/iir.icr.2019.0727 Final published version

To reference this document use

https://resolver.tudelft.nl/uuid:737b9ab0-157b-4ab7-9fbe-a1b873593cd3

More Info

expand_more

Publication Year

2019

Language

English

Research Group

Engineering Thermodynamics

Pages (from-to)

1070-1077

ISBN (electronic)

9782362150357

Event

25th IIR International Congress of Refrigeration, ICR 2019 (2019-08-24 - 2019-08-30), Montreal, Canada

Downloads counter

235

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.