Subcooled liquid water flows adiabatically in a constant diameter pipe past a throttling valve that is partially open. The liquid can be modeled as an incompressible flow (i. e., specific volume (v) is constant, u=CAT). The subscripts i and e refer to the conditions at the inlet and exit of the valve, respectively.

Indicate whether each difference below is positive, negative, or zero.

hi-he

pi-pe

ui-ue

ti-te