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a counter flowing heat exchanger cools air at 600 k 400 kpa to 320 k using a supply of water at 20c 200 kpa the water
consider the condenser in problem 748 find the specific energy and exergy that are given out assuming an ambient at 20c
apply the exergy equation to find the exergy destruction for problem 854problem 854a heat engine receives 1 kw heat
1 a flow of 1 kgs of air at 300 k is mixed with a flow of 2 kgs air at 1500 k in an insulated pipe junction at a
1 if the air conditioner in the previous problem is turned off how fast does the house heat up in ks2 a disk brake of 2
1 a heat engine receives 1 kw heat transfer at 1000 k and gives out 400 w as work with the rest as heat transfer to the
1 a turbine receives steam at 3000 kpa 500c and has two exit flows one at 1000 kpa 350c with 20 of the flow and the
1 a heat engine operating in an environment at 298 k produces 5 kw of power output with a first law efficiency of 50 it
1 air in a piston cylinder arrangement shown in figp8135 is at 200 kpa 300 k with a volume of 05 m3 if the piston is at
1 air in a pistoncylinder arrangement is at 110 kpa 25c with a volume of 50 l it goes through a reversible polytropic
consider the irreversible process in problem 6182 assume that the process could be done reversibly by adding heat
consider the heat engine in problem 8111 the exit temperature was given as 800 k but what are the theoretical limits
find the irreversibility in the cooling process of the glass sheet in problem 4144problem 4144dry air is heated from 77
1 a two-stage compressor takes nitrogen in at 20c 150 kpa and compresses it to 600 kpa 450 k then it flows through an
a cylinder with a linear spring-loaded piston contains carbon dioxide gas at 2 mpa with a volume of 50 l the device is
1 an air compressor receives air at 290 k 100 kpa and brings it up to a higher pressure in an adiabatic process the
1 a heat exchanger brings 10 kgs water from 100c up to 500c at 2000 kpa using air coming in at 1400 k and leaving at
the high-temperature heat source for a cyclic heat engine is a steady-flow heat exchanger where r-134a enters at 80c
a 1-kg rigid steel tank contains 12 kg of r-134a at 20c 500 kpa now the setup is placed in a freezer that brings it to
1 a pistoncylinder arrangement has a load on the piston so it maintains constant pressure it contains 1 kg of steam at
1 the compressor in a refrigerator takes refrigerant r-134a in at 15 lbf in2 0 f and compresses it to 125 lbf in2 100 f
a rock bed consists of 12 000 lbm granite and is at 160 f a small house with a lumped mass of 24 000 lbm wood and 2000
1 a heat pump with cop 4 uses 1 kw of power input to heat a 78 f room drawing energy from the outside at 60 f assume
1 a cylinder fitted with a piston contains ammonia at 50c 20 quality with a volume of 1 l the ammonia expands slowly
1 a pistoncylinder has 2 kg water at 1000 kpa 200c that is now cooled with a constant loading on the piston this