2- The following data relate to a two-pass surface condenser: Steam condensed = 1540 kg/hr Temperature of cooling water when it enters the condenser = 15° C Temperature of cooling water when it leaves the condenser = 30 ° C Vacuum in the condenser = 675 mm of Hg Barometer reading = 750 mm of Hg Temperature of condensate = 32 ° C Quality of exhaust steam = 0.92 Water velocity in tubes = 2.6 m/s Outside diameter of tubes = 2.8 cm Thickness of tubes = 0.03 cm Heat Transfer coefficient = 3.35 kJ/h/cm Determine Area of the tube surface required a- b- No. of tubes c- Length of tubes

2- The following data relate to a two-pass surface condenser: Steam condensed = 1540 kg/hr Temperature of cooling water when it enters the condenser = 15° C Temperature of cooling water when it leaves the condenser = 30 ° C Vacuum in the condenser = 675 mm of Hg Barometer reading = 750 mm of Hg Temperature of condensate = 32 ° C Quality of exhaust steam = 0.92 Water velocity in tubes = 2.6 m/s Outside diameter of tubes = 2.8 cm Thickness of tubes = 0.03 cm Heat Transfer coefficient = 3.35 kJ/h/cm Determine Area of the tube surface required a- b- No. of tubes c- Length of tubes

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

1. A standard refrigerating system with a heat exchanger is operating with a condenser pressure of 1571.2 kPa and evaporator pressure of 421.35 kPa using refrigerant R22. If the liquid line from the condenser is soldered to the suction line from the evaporator to form a heat exchanger and if as a result of this, the saturated vapor leaving the evaporator is superheated by 10.
1. Figure 1 below shows a stirred tank heating process-with a constant holdup volume. Assume mass flow rate w, of the inlet pipe is constant whereas its temperature T fluctuates but the product temperature T must be maintained within set temperature tolerances about the reference. Heater Figure 1: Stirred heating tank process
... Moving to another question will save this response. Question 7 Compressed air with a flowrate of 8 kg/min flows through a two-stage turbine and heat exchanger system as follows: • At the entrance to the system (point 1), the pressure of the air is 8 bar and the temperature of the air is 359 K. • From 1-2 the air passes through a heat exchanger which increases its temperature to 922 K. • From 2-3 the air passes through a turbine, with a pressure ratio of 3 (i.e. P₂/p₂=3). This first turbine has an isentropic efficiency of 65%. • From 3-4 the air passes through a second heat exchanger, which increases its temperature back up to 922 K. • From 4-5 the air passes through a second turbine with a pressure ratio of 3 and an isentropic efficiency of 80%. The properties of air are: cp = 1.005 kJ/kgk, cv = 0.718 kJ/kgK, R = 0.287 kJ/kgK, and y= 1.4. Select the correct value for each of the following values: ₂) a. The heat transfer to the air in the first heat exchanger (i.e. ₁) i in kW: b.…
Catalogue data of a water-cooled condenser of a manufacturer gives the following details: Condensing temperature 48.9°C Water inlet temperature 37.8°C Water flow rate 20.694 kg/s Capacity 145 tons Estimate the capacity of this condenser with the same water flow rate but with an inlet temperature of 30°C and a condensation temperature of 42°C. The evaporation temperature may be assumed to be constant at 2.2°C.
Please show complete solutions and detailed drawings. Show conversions, units, and box in the final answers
Steam CERE KJ -Valve Control volume boundary Turbine Initially evacuated tank In case of emergencies, a turbine is connected to an active steam pipe line using a valve. When the valve is opened, steam from the pipe line, which is initially at 550°C and 10 MPa, flows through the turbine into a 0.64 m³ tank, which is initially evacuated. The valve is closed when the pressure inside the tank is 1.6 MPa and the temperature in the tank is 300°C. If the entire process is completed adiabatically, what is the amount of work generated from the turbine?
An air-cooled condenser has an expected U value of 30 based on the air-side area. The m²-k condenser is to transfer 60 kW with an airflow rate of 15 kg/s entering at 35°C. If the condensing temperature is to be 48°C, what is the required air-side area? Recall Cp,air = 1.0- kg-K kJ
a. An air stream passing through a 2-inch (1/6 ft) diameter, thin-walled tube is to be heated by high- pressure steam condensing on the outer surface of the tube at 320 °F. The overall heat transfer coefficient, h between steam and air can be assumed to be 25 Btu/(ft2.hr °F) with the air entering at 100 ft/sec, 10 psia, 40 °F. The air is to be heated to 150 °F. Determine the tube length required. Assuming Rayleigh Line flow, calculate the static pressure change due to heat addition. Also, for the same inlet conditions, calculate the pressure drop due to friction, assuming Fanno flow in the duct with f = 0.018. b. c. d. To obtain an approximation to the overall pressure drop in this heat exchanger, add the two results. Discuss the accuracy of this calculation.
Homework: A counterflow heat exchanger is located between a collector and a storage tank. The fluid in the collector side is a water-glycol mixture with cp=3840 J/kg. °C and a flow rate of 1.35 kg/s, whereas the fluid in the tank side is water with a flow rate of 0.95 kg/s. If the UA of the heat exchanger is 5650 W/°C, the hot glycol enters the heat exchanger at 59°C, and the water from the tank at 39°C, a) estimate the heat exchange rate; b) if FRUL is 5.71 W/m².°C and collector area is 16 m², what is the ratio FR/FR?
B// What are the methods of draught in cooling towers. Demonstrate them with drawings. What is the relationship between the cooling tower and condenser. Q4IIA// Prove for the condenser: %3D + Cow (Tw2-Tw1) when the temperature of cooling water outlet and inlet is equal to saturation temperature of steam and the condensate leaving the condenser respectively; also, the inlet of condenser is dry steam with unity latent heat. Twi 1
Problem: An ammonia refrigerating system shown in the figure is composed of three evaporators and arranged with multiple expansion valves and intercoolers. The load and operating temperature of each evaporator are shown in the table below: condenser evaporator 3 compressor 3 intercooler 2 evaporator 2 compressor 2 Infercooler 2 liquid evaporator 1 compressor 1 Evaporator Load, tons Evaporator Temperature, °C 1 30 - 30 20 - 20 15 - 10 Condensing pressure is 1200 kPa. Refrigerant vapor exits evaporator no. 1 with a 10 - degree superheat. Saturated conditions exist at the exits of the evaporator no. 2 and evaporator no. 3. Liquid refrigerant leaves the condenser at 28°C. Determine a. the mass flow rate in evaporator 1 kg/s b. the mass flow rate in evaporator 2 kg/s c. the mass flow rate in evaporator 3 kg/s
The following data for steam condenser: Steam condensed = 50000 kg/h; Temperature of steam in condenser = 40 oC; Dryness of steam entering into condenser=0.85; The air leakage in the condenser = 150 kg/h; Temperature of the condensate = 35oC. Find: (1) The air leakage pressure. (2) Quantity of cooling water passed through the condenser per hour if the rise in cooling water temperature is limited to 10oC