Andy has good numerical skills that help him efficiently estimate quantities of materials required as well as costs involved in architectural projects. Which professional skill of an architect does Andy portray? select the correct answer

A. communication skills
B. business skills
C. social skills
D. artistic skills

Estimate the change in specific internal energy au and specific enthalpy h from inlet to outlet for ethylene glycol (a liquid) flowing through each of the following devices: (a) a heat exchanger where the glycol temperature increases from 20 °c to 80 °c; (b) a pump operating at about 25 °c and increasing the glycol pressure from 100 kpa to 8 mpa.