Effects of Pressure and a Microporous Coating on HFC-245fa Pool Boiling Heat Transfer

被引：18

作者：

Moreno, Gilberto ^{[1
]}

Jeffers, Jana R. ^{[1
]}

Narumanchi, Sreekant ^{[1
]}

机构：

[1] Natl Renewable Energy Lab, Golden, CO 80401 USA

来源：

JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME | 2014年 / 136卷 / 10期

关键词：

boiling heat transfer; critical heat flux; HFC-245fa; microporous coating; R134A; REFRIGERANT; SURFACE; TUBES;

D O I：

10.1115/1.4027966

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A study was conducted to experimentally characterize the pool boiling performance of hydrofluorocarbon HFC-245fa at pressures ranging from 0.15 MPa to 1.1 MPa (reduced pressure range: 0.04-0.31). Pool boiling experiments were conducted using horizontally oriented 1-cm(2) heated surfaces to quantify the effects of pressure and a microporousenhanced coating on heat transfer coefficients and critical heat flux (CHF) values. Results showed that the coating enhanced heat transfer coefficients and CHF by 430% and 50%, respectively. The boiling heat transfer performance of HFC-245fa was then compared with the boiling performance of HFC-134a and hydrofluoroolefin HFO-1234yf.

引用

页数：9

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