QUNSTION $1($IS MAMRE

A company is cumently using a natural gas boiler with an efficiency of $85\%$ to produce saturated

steam at $30$ bary form boiler feedwater at $80C.$ Currently the boiler is being used to satisfy the

heating demand stated in Table $3,$ The company would like to investigate the possibility of reduce

the operating pressure to $20$ barg,

Table $3$: Heating demand

Operational hours are $8,760h\frac{r}{y}f.$ Heating value of natural gas is $42,000k\frac{J}{m^3},$ with the price of

RM $\frac{5}{m^3},$ Refer to the Appendix for steam properties.

$($a$)$ Evaluate the changes in steam demand,

$(8$ Marks$)$

$($b$)$ Evaluate the fuel cost saving $($RM$/$y$).$