Optimization of R245fa Flow Boiling Heat Transfer Prediction inside Horizontal Smooth Tubes Based on the GRNN Neural Network

Table 1

Ambient conditions.

Parameter levels	Atmospheric pressure (kPa)	Ambient temperature (°C)	Ambient relative humidity (%)	Ambient wind velocity (m/s)
	80.735	30	15	2.7
	80.735	26	20	2.1
	80.735	22	25	1.5

Kunming is about 1860 meters above sea level, and the standard atmospheric pressure is Pa. For every 12-meter elevation, the atmospheric pressure drops by 133 Pa, so the atmospheric pressure of Kunming is 80.735 kPa.