Comparison Evaluations of VRF and RTU Systems Performance on Flexible Research Platform

Table 2

Regression models for RTU power consumption for heating season.

Category	Operation	Regression models	R^2
Building load (kWh)	RTU100		0.92
	RTU75		0.90
	RTU50		0.89
M_DOASadd (kWh)	RTU100		N/A
	RTU75		N/A
	RTU50		N/A
M_RTUDX + Fan (kWh)	RTU100		0.89
	RTU75		0.86
	RTU50 (if a < 5°C)		0.34
	RTU50 (if a > 5°C)		0.82
M_RTUcooling (kWh)	RTU100		0.98
	RTU75		0.92
	RTU50		0.91
M_NGheating (kWh)	RTU50 (if a < 4.4°C)		0.07
	RTU50 (if 4.4°C < a < 10°C)		0.91
	RTU50 (if a > 10°C)	Zero	N/A

a: outdoor air temperature (°C); b: global horizontal solar radiation (W/m²); c: time of day; d: M_RTU_DX + Fan.