The open literatures provide lots of correlation for estimating the in-tube CO2 flow boiling heat transfer coefficient. In the case of plate heat exchanger, the correlations are available for R134a, R410A, etc. I was looking for something generalized or specific correlation that accounts the phase change (boiling/evaporation) for CO2 inside a brazed plate heat exchanger (BPHX). Because, the flow inside a BPHX should be very different than the in-tube flow.
Estimating the CO2 flow boiling heat transfer coefficient inside a brazed plate heat exchanger (BPHX) can be challenging due to the complex flow and heat transfer phenomena involved. While there may not be a universally accepted correlation specifically tailored for CO2 flow boiling inside a BPHX, you can explore the available literature for correlations that can serve as a starting point. Here are a few suggestions:
It's important to note that these correlations may require modification or adaptation for CO2 specifically in a BPHX since the flow characteristics inside a BPHX can differ from traditional tube heat exchangers. Additionally, experimental validation of any correlation is crucial to ensure its accuracy for your specific operating conditions.
To obtain more accurate and specific results for CO2 flow boiling inside a brazed plate heat exchanger, it may be necessary to conduct experimental studies or numerical simulations specifically tailored to your system.
Thank you very much for your valuable suggestions. I agree with you on all the points.
The flow boiling heat transfer coefficient for CO2 inside a brazed plate heat exchanger (BPHX) can be estimated using existing correlations for flow boiling heat transfer, with some modifications to account for the specific characteristics of the BPHX. However, it is important to note that the accuracy of the results will depend on the quality and relevance of the experimental data used to develop the correlation.
There are several correlations available in the literature for estimating the flow boiling heat transfer coefficient of CO2, such as the correlation by Kandlikar et al. (1999) and the correlation by Gungor and Winterton (1986). However, these correlations are typically developed for specific flow geometries and operating conditions, and may not be directly applicable to the flow inside a BPHX.
To develop a correlation that is specific to the flow boiling of CO2 inside a BPHX, experimental data would need to be collected under similar operating conditions, such as mass flow rate, heat flux, pressure, and fluid properties. The data could then be used to develop a correlation that takes into account the specific geometry and flow characteristics of the BPHX.
Alternatively, you may also consider using computational fluid dynamics (CFD) simulations to estimate the flow boiling heat transfer coefficient inside a BPHX. CFD simulations can provide detailed information about the flow and temperature fields inside the BPHX, and can be used to estimate the local heat transfer coefficients. However, the accuracy of the CFD simulations will depend on the quality of the input data, such as the geometry and boundary conditions, and the accuracy of the models used to simulate the fluid flow and heat transfer.
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Thank you very much for your valuable feedback. I agree with you on the points stated above.
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