(8 points) air is used as the working fluid in a simple ideal brayton cycle that has a pressure ratio of 12, a compressor inlet temperature of 300 k, and a turbine inlet temperature of 1000 k. determine the required mass flow rate of air for a net power output of 70 mw, assuming both the compressor and the turbine have an isentropic efficiency of (a) 100 percent and (b) 85 percent. answers: (a) 352 kg/s, (b) 1037 kg/s

a )

b)  

Explanation:

given data:

pressure ration rp = 12

inlet temperature = 300 K

TURBINE inlet temperature  = 1000 K

AT the end of isentropic process (compression) temperature is

AT the end of isentropic process (expansion) temperature is

isentropic work is given as

w = 1.005(610.18 - 300)

w = 311.73 kJ/kg

w(turbine) = 1.005( 1000 - 491.66)

w(turbine) = 510.88 kJ/kg

a) mass flow rate for isentropic process is given as

b) actual mass flow rate uis given as

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it