What is the expression for enthalpy of each heater hper heater if a represents the enthalpy of heated feedwater from the economiser and b represents the enthalpy at condenser & n represents the number of heaters?

• A. hper heater = (a-b)/ (n + 1)b) hper heater = (a-b) x (n – 1)c) hper heater = (a-b) + (n – 1)d) hper heater = (a-
• B. / (n + 1)b) hper heater = (a-b) x (n – 1)
• C. hper heater = (a-b) + (n – 1)
• D. hper heater = (a-b) – (n + 1)