XT
X. Toa
11 records found
1
Condensation du NH3 / H2O avec des concentrations massiques entre 80% et 96%
Étude expérimentale dans un échangeur de chaleur à plaque
High concentration NH3/H2O is suitable for Kalina cycles used for the recovery of low grade heat. Plate heat exchangers (PHEs) are compact and reduce the charge of working fluid. This paper investigates the condensation of NH3/H2O with
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NH3 condensation within plate heat exchangers
Flow patterns, heat transfer and frictional pressure drop
Energy shortage and energy related environmental problems are urgent issues to be addressed in the coming years. Low-grade heat is utilized to drive energy conversion cycle and to produce electricity, which is a renewable and sustainable approach to energy supply. These thermodyn
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NH3 condensation in a plate heat exchanger
Flow pattern based models of heat transfer and frictional pressure drop
This paper develops predicting models for NH3 condensation in plate heat exchangers based on the experiments of flow patterns, heat transfer coefficients and frictional pressure drop previously reported by the authors. The aim is to provide design methods of compact pl
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NH3 condensation in a plate heat exchanger
Experimental investigation on flow patterns, heat transfer and frictional pressure drop
This paper investigates NH3 condensation in a plate heat exchanger by visualizing the flow patterns and measuring heat transfer coefficients and frictional pressure drop. Visualization experiments were conducted between 20 and 100 kgm−2s−1. Full f
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Heat transformers reveal significant potential for primary energy savings in domestic and industrial processes, which can use different heat sources as driving force to provide the heat or cooling. In this paper, a hybrid resorption-compression heat transformer is presented, whic
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Most plate heat exchangers (PHEs) have hydraulic diameters in the range of 2∼5 mm and show characteristics of both macro-channels and micro-channels. Both gravity and surface tension have non-negligible influences and determine the heat transfer and frictional pressure drop.
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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
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Heat transfer and frictional pressure drop during condensation in plate heat exchangers
Assessment of correlations and a new method
The corrugation channels of plate heat exchangers enhance the heat transfer and complicate the prediction of heat transfer coefficients and frictional pressure drop. This paper reviews the heat transfer and frictional pres
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Two-phase vertical downward flow in plate heat exchangers
Flow patterns and condensation mechanisms
This study presents a literature review of work related to the two-phase flow patterns of vertical downward flow in plate heat exchangers with corrugated chevron plates. An understanding of these flow patterns is crucial for developing accurate models of plate heat exchangers fun
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The availability of open source experimental data of NH3 condensation within plate heat exchangers (PHEs) is very limited. This work attempts to extend the database. For this purpose step by step experiments are carried out in a setup capable of local measurements. Temperature se
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