Based on the definitions of COP along with equation (3), the heating COP equals the cooling COP added the constant 4. So the heating COP will also reach maximum when the injection pressure is smaller than or equal to the OIPCC.
Based on the definitions of COP along with equation (3), the heating COP equals the cooling COP added the constant 4. So the heating COP will also reach maximum when the injection pressure is smaller than or equal to the OIPCC.