English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In this paper, condensation heat transfer coefficients (HTCs) of R-417A in horizontal smooth and micro-fin tubes under different parameters such as refrigerant saturated vapor temperatures (dew point) (4060°C), cooling water inlet temperature (15 30°C), cooling water velocity (0.65 0.85ms) have been investigated. Predicted HTCs in smooth tube are within ± 20% as compared with literature correlations for R-22 and R417A respectively. Condensation HTCs decreased by 58% as the condensation temperature increased from 40 to 60°C at constant water temperature of 25°C. Cooling water inlet temperature has the most significant impact on condensation HTCs where condensation HTCs increased from 1.6 to 5.6 (kWmK) as the cooling water inlet temperature changed from 15 to 30°C at refrigerant saturated vapor temperature of 40°C. It should be pointed out, condensation HTCs decreased by 32.3% and 15.3% using R-417A as compared with R-22 at saturation temperatures of 40°C and 60°C at cooling water inlet temperature of 15°C.

EXPERIMENTAL EVALUATION OF CONDENSATION HEAT TRANSFER COEFFICIENT OF R-417A IN HORIZONTAL TUBES