3.) An ammonia compressor operates at evaporator pressure of 316.02 kPa and a condenserpressure of 1557 kPa. A twin-cylinder compressor with bore to stroke ratio of 0.85 is toused at 1200 rpm. The actual volumetric efficiency is 92% and compression and mechanicalefficiency is 78% and 80% respectively. For a cooling capacity of 25 TR, (a) the sketch thep-h diagram labeling the evaporating and condensing temperature and pressures (b) definethe all properties of ammonia taken from saturation table. Determine (c) the quantity ofcooling water in the condenser in kg/min if the increase in temperature is 8°C, (d) the boreand stroke expressed in cm and (e) the size of the driving motor in hp.Given: h2 = h at 1557 kPa and s2 = s11695 kJ/kg

Answered: 3.) An ammonia compressor operates at…

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

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A straight-condensing 10,500 kW turbine has a guaranteed steam rate of 6 kg/kW.hr when exhausting at 5.0 kPa. Exhaust steam enters the condenser at 90% quality, and it is estimated that fouling will decrease the overall coefficient by 30% during operation. Cooling water is available at 20 ℃, and for design purposes, 1 ½ in OD 17 BWG Brass tubes (thickness = 0.070 in, k=65 BTU/hrftF°.) are specified with 12 C° rise in cooling water, which circulates at 6 ft/s. Inside and outside film coefficients are hi=970 and ho=1478 BTU/hrft2F°. Design a condenser for this turbine, considering tube and boundary resistance as flat surfaces and neglecting any crossflow factor. Determine: a) Effective overall coefficient of heat transfer b) Volume flow rate of cooling water
Question (1) 1. What are the different methods of the water treatments for boiler make-up water? 2. Determine the power required for a forced draught and induced draught fan in a boiler having coal consumption of 25 komin and airlfuel ratio of 19 by mass. The ambient, air temperature and hot gas temperature at exit are 30 °C and 140 °C respectively. Draught required is equivalent to 32.2 mm of water and mechanical efficiency of motor/fan is merely 70%
In a cyclic comprising of air compressor and expansion, workdone by a prism during the compression stroke is 9.2KJ and the heat rejected to the surrounding is 50KJ. During the expansion stroke workdone by air on the prism is 8.4KJ. a) Determine the quality of heat transferred to or from the system. Tullow oil has discovered a large volume of crude deposit at Cape-3-Point along the western coast of Ghana after years of intensive exploration. In the Company’s bid to start exploration, Green Ghana an environmental protection NGO took Tullow to court to prevent the Company from embarking on the said project citing numerous environmental concerns. b) As an energy and sustainability expert, what do you think are the side effects of the project and their remedies? A cooling water pump is operating at a speed of 1800rpm. Its flow rate is 1800L/minutes at a head of 14.4m and the power of the pump is 45kw. c) Determine the power required if the pump speed is increased…
A freon 12 waste water system operating at 5 °C suction temperature and a 40°C condensing temperature has an evaporator load 17.6 KW. If the condenser is selected for a 70°C water temperature rises, how many gpm must be circulated through the condenser? The following enthalpies have been found; condenser entrance =377 kJ/kg; exitA=238.5 kJ/kg; evaporator entrance =238.5 kJ/kg; exit = 253.6 kJ/kg.
REFERENCE: FROM BOOK - ENGINEERING THERMOFLUIDS, M. MASSOUD
A vapour compression refrigerator working with Freon-12 has its temperature range -10°C and 30°C. The Vapour enters the compressor dry and under cooled by 5°C in the condenser. For a capacity of 15 TOR, find: C.O.P Entropy Temp °C 30 -10 Enthalpy hf 64.59 26.87 Hfg 135.03 156.31 ng 199.62 183.19 Sf 0.24 0.108 Sg 0.6853 0.7019
Q1/ A gas turbine operates with components as shown in figure 1. Air enters this first compressor at 96.5 kPa. and 15.5°C; the pressure ratio is 3 for each stage of compression; the air temperature when entering a turbine is 504.5°C; and the heat perfect exchanger. (Take air index as 1.4 and specific heat as 1.005 kJ/kg.K). Draw T-S diagram and determine: a. The air mass flow rate, and the rates of heat addition and rejection when this produced power is 745.7 kW. b. What will be the effect of using normal heat exchanger on the thermal efficiency? Inter-cooler c2 Cormpressors Turbines Generator set cc 1 State1 Нeat Exchanger State10
A Rankine cycle is executed with steam expanding initially from 20 MPaa and 100 deg SH.Condensation occurs at T = 86.49 degree Celsius. All expansion and compression efficiencies are 90 %.Sketch the equipment layout and the TS diagram. Answer the following for (m = 10 + SN/10 ) kg/sec of steam circulated and fill up the blanks in theitems below:1. TS diagram with the cycle showing correct location of points with respect to saturation domeline with ne and nc = 90%.2. If the generator efficiency = 95%, brake engine efficiency = 90% what is the brake work in KW?Answer: ______________________3. Actual Steam Rate for the engine in Kg/KW-hr with efficiency values at item 2. Answer: _________________________
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Steam is generated at 10 MPa and 450OC and condensation occurs at 170 kPa. (a)For a Rankine engine operating between these limits, compute the thermal efficiency and the heat rate. (b) Considering that a Rankine cycle occurs between the limits, determine QA, QR, WNet, and eC. (c)What mass flow rate is required for a net output of 35 MW?
Question 2: (a) The pressure at which the steam should be reheated. (b) The thermal efficiency of the cycle. (c) Total heat input (Qin) (d) Total turbine work output (Wtur.out) (e) Draw the T-S diagram Notes: Assume the steam is reheated to the inlet temperature of the high-pressure turbine. • The moisture content of the steam at the exit of the low-pressure turbine is not to exceed 9.5% Boiler 650 C 17.5 MPa ww Reheater High-P turbine P₁ = Ps= Preheat Pump Low-P turbine Condenser e 15 KPa

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