Heat transfer and pressure drop during condensation in minichannels of new refrigeration fluids at the parameters close to thermodynamic critical point

Project “Heat transfer and pressure drop during condensation in minichannels of new refrigeration fluids at the parameters close to thermodynamic critical point” is based on experimental research. Existing laboratory bench for measurement of heat transfer coefficient during boiling at near critical parameters will be modified. Condensation test section will be installed. Three refrigerants will be tested (HFE7200, SES36, R1233zd(e)). Condensation test section will consist from copper 3 mm diameter tube inside outer steel tube. Refrigerant will flow inside 3mm diameter channel while coolant will flow between tubes. In first coolant loop water will flow in high velocity (above 20 g/s) to ensure high heat transfer coefficient on water side and low temperature difference between an inlet and an outlet of the test section. First cooling loop, will be cooled with second cooling loop with water on low flow rate, what will allow achieve high temperature gradient to accurately determine heat duty of the test section. After obtaining experimentally results in house correlation will be modified to account for increased values of reduced pressure. During work valuable publications will be written. Laboratory apparatus will be expanded. Unit will receive indirect funds also.

Details

Financial Program Name:: PRELUDIUM
Organization:: Narodowe Centrum Nauki (NCN) (National Science Centre)
Realisation period:: unknown - unknown
Project manager:: mgr inż. Stanisław Głuch
Realised in:: Faculty of Mechanical Engineering
Request type:: National Research Programmes
Domestic:: Domestic project
Verified by:: Gdańsk University of Technology

Papers associated with that project

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total: 3

Year 2024

Modelling of heat transfer during flow condensation of natural refrigerants under conditions of increased saturation pressure
Publication
- S. Głuch
- D. Mikielewicz
- Archives of Thermodynamics - Year 2024
The paper presents a modified in-house model for calculating heat transfer coefficients during flow condensation, which can be applied to a variety of working fluids, but natural refrigerants in particular, at full range thermodynamic parameters with a particular focus on increased saturation pressure. The modified model is based on a strong physical basis, namely the hypothesis of analogy between the heat transfer coefficient...

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Year 2023

Application of Feed Forward Neural Networks for Modeling of Heat Transfer Coefficient During Flow Condensation for Low and High Values of Saturation Temperatur
Publication
- S. Głuch
- T. Niksa-Rynkiewicz
- D. Mikielewicz
- P. Stomma
- Year 2023
Most of the literature models for condensation heat transfer prediction are based on specific experimental parameters and are not general in nature for applications to fluids and non-experimental thermodynamic conditions. Nearly all correlations are created to predict data in normal HVAC conditions below 40°C. High temperature heat pumps operate at much higher parameters. This paper aims to create a general model for the calculation...

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Flow Maps and Flow Patterns of R1233zd(E) in a Circular Minichannel at Low, Medium and High Values of Saturation Pressure
Publication
- Year 2023
There is a gap in knowledge regarding the flow pattern of low-boiling working fluids in the range of high saturation temperatures (above 120°C) and medium and high reduced pressures (0.5-0.9). Data are present in the literature for similar values of reduced pressures, but for lower values of saturation temperature. This is due to the existing refrigeration applications of these working fluids. At high values of reduced pressure,...

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