Problem 5.1 The following data are given for a family biogas digester suitable for theoutput of six cows : the retention time is 25 days, temperature is 27° C, dry matterm²,consumed per day per cow is 2 kg, biogas yield is 0.26 m/kg. The efficiency of burner is70%, methane proportion is 0.75. Assume heat of combustion of methane is 28 MJ/m'.Determine (i) the volume of biogas digester, and (ii) the power available from the digester.

Answered: Image /qna-images/answer/a15e2aa2-8132-4b88-91cd-d5360cc9ac47.jpg

Answered: Problem 5.1 The following data are…

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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Thermodynamics Fill in the Blanks: 1) In a spark-ignition engine, a mixture of fuel and air is ignited by a(n) _____________ 2) In a cold air-standard analysis, the specific heats are assumed ___________ at their ambient temperature values. 3) Ericsson and Stirling cycles operating between thermal reservoirs at TH and Tc have thermal efficiencies equal to that of a _____________ cycle operating between the same thermal reservoirs.
d. Analysis of the Diesel Cycle[Explain the Derivation of the following in relation to the diagram]: 1.) QA 2.) Qr 3.) W 4.) thermal efficiency - e 5.) the compression ratio - rk 6.) the cut off ratio - rc 7.) Derivation of the formula for e Process 1-2 Process 2-3 Process 3-4 8.) Relation among rk, rc, and re(expansion ratio)
Water is the working fluid in a vapor power plant. Steam enters the turbine at 4 MPa, 540 °C, and exits the turbine as a two-phase, liquid vapor mixture at 27 °C. The condensate exits the condenser at 25 °C. The turbine efficiency is 90% and the pump efficiency is 80%. The power developed is 1 MW. ▾ ▼ Part A Determine the steam quality at the turbine exit. Express your answer to four significant figures. x = Submit Part B m = Determine the mass flow rate. Express your answer to two decimal places. Submit VAZ Ivec h A Part C Request Answer | ΑΣΦ | | vec S Request Answer Determine the thermal efficiency, Express your answer to four significant figures. 1971 ΑΣΦ | | | vec ← O C pw! 229 ? ? ? kg/s
Question 1 a. Explain the following terms related to thermodynamics: i. Closed system. ii. Intensive property. iii. Thermodynamic cycle. iv. Heat engine. b. Sketch a T-s diagram of steam as pure substance and clearly indicate the following terms on the diagram: i. the liquid region. ii. the wet region. ii. the superheat region iv. the critical point v. the saturated liquid line. vi. the saturated vapour line.
15.68 2 A six-cylinder, four-stroke, direct-injection oil engine is to deliver 120 kW at 1600 rpm. The fuel to be used has a calorific value of 43 M.J/kg and its percentage composition by mass is carbon 86.0%, hydrogen 13.0%, non combustibles 1.0%. The absolute volumetric efficiency is assumed to 80%, the indicated thermal efficiency 40% and the mechan- ical efficiency 80%. The air consumption to be 110% in excess of that required for theoretically correct combustion. (i) Estimate the volumetric composition of dry exhaust gas (ii) Determine the bore and stroke of the engine, taking a stroke to bore ratio as 1.5. Assume the volume of 1 kg of air at the given conditions as 0.77 m. Oxygen in air is 23% by mass and 21% by volumme. tion
Provide a long answer using necessary graphs / equations. Describe the Rankine thermodynamic cycle. What thermodynamic processes occurs? Where is the cycle used? How to improve the cycle?
a.Draw a schematic diagram with labels of states of a substance; b.For uniformity purposes, assign STATE 1 at the inlet of a high-pressure turbine. The states must be arranged in a chronological order; c.Plot each cycle in a t-s diagram with the states consistent to the states assignment in the schematic diagram; d.Show a detailed solution. Consider a regenerative vapor power cycle with a single open feedwater heater. Steam enters the first turbine stage at 12MPa, 500 0C, and expands to 0.3MPa where some steam is extracted and fed to the feedwater heater. The remainder expands through the second-stage turbine and exits at the condenser pressure of 0.01 MPa. Saturated liquid at 0.3 MPa leaves the open feedwater heater. If the net power output of the cycle is 100 MW,and the turbine stages and pumps are isentropic, determine (a) the thermal efficiency, and(b) the mass flow rate of steam entering the first turbine, in kg/h.
Show detailed solution please.
(a) With a neat sketch, explain the working of Floating gas holder type biogas plant. List any two disadvantages of this type of biogas plant.
34
1. A. Using the Steam Tables, determine the amount of cooling water needed by a condenser in kg/sec if wet steam comes into the condenser at P= 610.44mmHG vac and 99.47 % moisture, mass flow rate = 7200 + (10/13) kg/hr. Cooling water enters the condenser at 12 deg Cand leaves at 21 deg C. Answer: diagrams below. Cp H20 = 4.187 KJ/kg-K): Schematic diagram of heat exchanger =condenser B. Draw the schematic diagram of the condenser and process in the PV and TS V 2. Use only the MD below to solve this Item; use it by plotting data and process to determine items being asked. Steam enters a turbine at 117.4308 atmgage and 932 deg. F, and expands isentropicaly to 177.17 inches of Hg. For 2 + (10/13 kg/sec of steam, what is (a) the ideal work done (KJ/sec) if AKE = 0 and actual exhaust enthalpy is 2700 KJ/kg. a)Ans: (b)ne =. (c]Determine: ideal steam moisture at exhaust. Ans: (d) Actual steam quality at exhaust Ans: (e) Actual steam temp g) change in entropy during the actual process. at the…

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