# Thermodynamics 5 75 the hot and cold streams of a

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THERMODYNAMICS 5-75 The hot and cold streams of a fluid are mixed in a rigid mixing chamber. The hot fluid flows into the chamber at a mass flow rate of 5 kg/s, with an energy amount of 150 kJ/kg. Cold fluid flows into the chamber at a mass flow of 15 kg/s and carries an amount of energy of 50 kJ/kg. There is heat transfer to the environment of the mixing chamber, in the amount of 5.5 kW. The mixing chamber operates with steady flow and does not gain or lose energy or mass over time. Determine the energy carried by the outlet stream of the mixing chamber by the fluid mixture per unit mass of fluid, in kJ/kg. P-261 5-81 A condenser of a thermoelectric plant enters steam at 20 kPa and 95 percent of quality, with a mass flow of 20,000 kg/h. It will cool with water from a nearby river, passing it through the tubes located inside the condenser. To avoid thermal contamination, river water should not have a temperature rise greater than 10 ° C. If the steam should leave the condenser as a saturated liquid at 20 kPa, determine the mass flow of the cooling water required. P-261 6-21 A thermo plant with a power generation of 150 MW consumes coal at a rate of 60 tonnes/h. If the calorific value of coal is 30.000 kJ/kg.

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