Chapter 9, Problem 9.49P

part a b and c

ercise 6 6.1 A surface condenser is fitted with separate air and condensate outlets. A portion of the cooling surface is screened from the incoming steam and the air is passes over these screened tubes to the air extraction and becomes cooled below the condensate temperature. The condenser receives 20 000kg/hr of dry saturated steam at 36.2°C. At the condensate outlet the temperature is 34.6°C TK and at the air extraction the temperature is 29°C. The volume of air and vapour leaving the condenser is 3.8m3/min. Assume constant pressure throughout the condenser, calculate: 6.1.1 the mass of air removed per 10 000kg of steam (2.63kg); 6.1.2 the mass of steam condensed in the air cooler per minute (0.5kg/min)%3B 6.1.3 the heat rejected to the cooling water (13451kW).

Please show step by step solutions for each part  As shown in Figure 1, one portion of the hot flue gases is supplied to the steam generator. The steam generator is a shell and tube type of heat exchanger. In this steam generator treated bore water flows through the tubes while the hot flue gases flow in the shell, and steam is produced. The average demand of the steam for other processes within the iron/steel industry is (251) kg/hr at (155) ℃ temperature and 400kPa absolute pressure. Treated bore water is supplied to the steam generator at an average temperature of 20℃. The average pressure drop in the water line of the steam generator is 10kPa. The flue gases enter the shell and tube heat exchanger (steam generator) at a pressure of 110 kPa (Absolute) and a temperature of (252) ℃ and average mass flow rate of (134) kg/min. The average pressure drop in the flue gas side of the steam generator is 5kPa. Flue gases can be assumed to behave as ideal gas and have constant specific heat…

5. A counter-flow bank of boiler tubes has a total area of 900 sq ft and its overall efficiency of heat transfer is 13 Btu/hr-ft2-degF. Calculate the heat transferred if the log mean temperature difference is 1380 deg F.

Steam passes steadliy through a turbine and condenser as shown in the figure below. After expanding through the turbine and producing 1000kW of power, the steam is at a pressure of 0.08 bar and a quality of 87.4%; it enters a shell-and-tube heat exchanger where the steam now condenses on the outside of tubes through which cooling water flows; this condensate continues to flow, finally exiting as saturated liquid at 0.08 bar. The mass flow rate of the condensing steam is 58kg/s, In order to condense the steam, cooling water enters the tubes at 15°C and flows as a separate stream to exit at 35°C with negligible change in pressure. Stray heat transfer is negligible as are kinetic and potential effects. Considering the steam inside the turbine as a system, is the system best described as open, closed or isolated? What is the mass flow rate of steam entering the turbine in kg/s? What is the enthalpy at the inlet of the turbine in k/kg? What is the mass flowrate of the cooling water in kg/s?…

. The exhaust gas regenerator (counter-flow heat exchanger) for a gas turbinehandles 1.9 kg/sec of air from its compressor and heats it by means of 2.2 kg/secof hot exhaust gas. Exhaust gas enters the regenerator at 596°C and leaves at312°C. Compressed air enters the regenerator at 220°C. For this temperaturerange a constant pressure specific heat for the exhaust has may be estimated at1090 J/kg-°C. Assume no heat transfer other than between the generator fluids.Determine the log mean temperature difference for the exchanger, °CA. 16.98 B. 26.98 C. 36.98 D. 46.98

The purpose of the regenerative heat exchanger is to essentially recycle the heat rejectedin step (B) as heat absorbed in step (D). Show why this works for the case of a general workingfluid with heat capacity, Cv(T).

Problem solving

include diagram.