Journal ArticleDOI
Evaporation Heat Transfer and Pressure Drop of Refrigerant R-410A Flow in a Vertical Plate Heat Exchanger
Y. Y. Hsieh,T. F. Lin +1 more
TLDR
In this paper, the evaporation heat transfer coefficient h r and associated frictional pressure drop ΔP f in a vertical plate heat exchanger for refrigerant R-410A were measured.Abstract:
Experiments are carried out hero to measure the evaporation heat transfer coefficient h r and associated frictional pressure drop ΔP f in a vertical plate heat exchanger for refrigerant R-410A. The heat exchanger consists of two vertical counterflow channels which are formed by three plates whose surface corrugations have a sine shape and a chevron angle of 60 deg. Upflow boiling of refrigerant R-410A receives heat from the hot downflow of water. In the experiments, the mean vapor quality in the refrigerant channel is varied from 0.10 to 0.80, the mass flux from 50 to 100 kg/m 2 s, and the imposed heat flux from 10 to 20 kW/m 2 for the system pressure fixed at 1.08 and 1.25 MPa. The measured data incinerate that both h r and AP, increase with the refrigerant mass flux except at low vapor quality. In addition, raising the imposed heat flux is found to significantly improve h r for the entire range of the mean vapor quality. However, the corresponding friction factor f is insensitive to the imposed heat flux and refrigerant pressure. Based on the present data, empirical correlations are provided for h r and f tp , for R-410A in the plate heat exchanger.read more
Citations
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Journal ArticleDOI
Performance and design optimization of a low-cost solar organic Rankine cycle for remote power generation
TL;DR: In this article, the authors describe the design of a solar organic Rankine cycle being installed in Lesotho for rural electrification purpose, which consists of parabolic trough solar thermal collectors, a storages tank, and a small-scale ORC engine using scroll expanders.
Journal ArticleDOI
Floatable, Self-Cleaning, and Carbon-Black-Based Superhydrophobic Gauze for the Solar Evaporation Enhancement at the Air-Water Interface
TL;DR: It is shown that the carbon-black-based superhydrophobic gauze was able to float on the surface of water and selectively heat the surface water under irradiation, resulting in an enhanced evaporation rate.
Journal ArticleDOI
Condensation heat transfer and pressure drop of refrigerant R-410A flow in a vertical plate heat exchanger
TL;DR: In this article, the authors investigated the effects of the refrigerant mass flux, imposed heat flux, system pressure (saturated temperature) and mean vapor quality of R-410A on the measured data and proposed an empirical correlation for the R410A condensation heat transfer coefficient in the vertical plate heat exchanger.
Journal ArticleDOI
A review of heat transfer enhancement techniques in plate heat exchangers
TL;DR: In this paper, a comprehensive review of previous works regarding the effects of chevron corrugation geometrical parameters on the performance of plate heat exchangers is provided, focusing on passive surface techniques and the use of nanofluids.
Journal ArticleDOI
Plate heat exchangers: Recent advances
TL;DR: In this paper, the advances in plate heat exchangers both in theory and application are presented, and the direction of various technical research and developments in the field of energy handling and conservation is discussed.
References
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Book
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John G. Collier,John R. Thome +1 more
TL;DR: In this paper, the basic models of two-phase flow are discussed and empirical treatments of two phase flow are provided. But the authors focus on convective boiling and condensing.
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K.E. Gungor,R.H.S. Winterton +1 more
TL;DR: In this article, a new general correlation for forced convection boiling has been developed with the aid of a large data bank consisting of over 4300 data points for water, refrigerants and ethylene glycol, covering seven fluids and 28 authors.
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