What is subcooling? What is the difference between valve-open subcooling and valve-closed subcooling? Which one is greater?

The absolute value of the difference between the condensate temperature and the saturated temperature at the corresponding pressure is the subcooling.

The valve-open subcooling refers to the absolute value of the difference between the valve-open temperature and the saturated temperature at the corresponding pressure.

The valve-closed subcooling is the absolute value of the difference between the valve-closed temperature and the saturated temperature at the corresponding pressure.

The valve-open subcooling is greater than the valve-closed subcooling.