B// What are the methods of draught in cooling towers. Demonstrate them with drawings. What is the relationship between the cooling tower and condenser.
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- An ammonia compressor has a volumetric effienciy og 85%, operating condensing & evaporating temperatures of 40 C & 10 C respectively for a cooling capacity of 10 tons with compression index of 1.2, mean piston speed of 2m/s, 5% clearance & bore to stroke ratio of 0.7. Determine the ff: 4. work of compressor in kj/kg 5. power of compressor in kj/kg 6. cooling coefficient of performanceAn ammonia compressor has a volumetric effienciy og 85%, operating condensing & evaporating temperatures of 40 C & 10 C respectively for a cooling capacity of 10 tons with compression index of 1.2, mean piston speed of 2m/s, 5% clearance & bore to stroke ratio of 0.7. Determine the ff: 1. Draw the PH diagram indicating the temperatures, enthalpies, and initial specific volume 2. Refrigerating effect in kj/kg 3. mass flow rate in kg/s 4. work of compressor in kj/kg 5. power of compressor in kj/kg 6. cooling coefficient of performance 7. piston displacement in cu. meters/min 8. bore in mm 9. stroke in m 10. motor rpmAn ammonia compressor has a volumetric effienciy og 85%, operating condensing & evaporating temperatures of 40 C & 10 C respectively for a cooling capacity of 10 tons with compression index of 1.2, mean piston speed of 2m/s, 5% clearance & bore to stroke ratio of 0.7. Determine the ff: 1.Draw the PH diagram indicating the temperatures, enthalpies, and initial specific volume 2. Refrigerating effect in kj/kg 3. mass flow rate in kg/s 4. work of compressor in kj/kg
- During processing in a steel mill, a 375kg steel casting at 800 degrees is quenched by plunging it into a 500-gal oil bath, which is initially 75 degrees . After the casting cools and the oil bath warms , what is the final tempertature of the two? The weight per unit volume of the oil is 7.5 lb/gal.A coal with a higher heating value of 6,700 Kcal/kg is consumed at a rate of 600 kg/hr. in a water tube steam generator with a rated boiler horsepower of 200 HP. The feedwater temperature is 82°C and steam generated is at 11 kg/cm2 absolute, saturated. The developed boiler horsepower is equivalent to 305 HP. Determine: a. Heating surface area in m²b. Steam evaporated in kg/hrc. ASME evaporating units in J/hrd. Percent ratinge. Factor of evaporationf. Over-all thermal efficiencyg. actual specific evaporationh. Equivalent specific evaporation.The refrigerant volume flow rate at the entrance of compressor wereobtained from a test on a twin cylinder single acting 15 cm x 20 cm, 320 rpmcompressor ammonia refrigerating plant 33 L/s. Determine the volumetricefficiency of the compressor.
- Determine the power required for a forced draught and induced draught fan in a boiler having coalconsumption of 25 kg/min and air/fuel ratio of 19 by mass. The ambient air temperature and hotgas temperature at exit are 30C and 140C respectively. Draught required is equivalent to 32.2 mmof water and mechanical efficiency of motor/fan is merely 70%An exhaust stream exits a plant at 1 atm and 160˚C at a rate of 1 m3/hr. Unfortunately, it includes 60,000 ppm of heptane, which was used as a solvent. Not only will this heptane contribute to ozone formation upon release, but this solvent costs $1.80 / L. The lost solvent, which has a specific gravity of 0.7, must be replaced when it exits in the exhaust. Consider proposing a cost-benefit analysis to the plant manager. One solution is to cool the exhaust stream, which requires energy and equipment. To recover 35% of the heptane before it is released to the atmosphere, what temperature would the exhaust need to be before exiting? How much money could the proposed equipment and operation cost per day while still breaking even?Solve for the latent heat of water at Tw = 28C(and. λw = 2435 kJ/kg)
- Steam generators are a type of heat exchanges that are used in power plants to generate steam at desired pressure and temperature (Fig. Q1.b). In a steam generator, saturated liquid water at 30°C enters a 60-mm diameter tube at the volume flow rate of 12 L/s. After exchanging heat with hot gas, the water changes to steam and leaves the generator at a pressure of 9 MPa and a temperature of 400°C. During this process, the diameter of the water/steam tube does not change.(iii) What is the exit velocity of the steam?What is the difference between specific internal energy and specific enthalpy in first law of Thermodyanamics and when should i use which? From what i understand so far for constant pressure process, we use q-w=h2-h1 and constant volume process, we use q-w = u2-u1. But this isnt the answer i am looking for.Q29. Steam enters the condenser of a power plant at 3 psia and a quality of 95% with a ratio ofmass flow of 40,000 lbm/hr. It will be cooled with water from a nearby river, which will circulate through the tubes inside the condenser. In order to avoid thermal pollution, the river water is not allowed to suffer from an increase in temperature.temperature greater than 18°F. If steam is to leave the condenser as a saturated liquid at 3 psia, determine how many times the mass flow rate of steam will be the mass flow rate of water, as well as the heat transfer from one system to the other.