Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Chapter 14, Problem 4SA
Describe the procedure for using air bleed valves to purge air out of a cooling system.
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1-A counterflow, concentric tube heat exchanger is used to cool the lubricating oil for a large
industrial gas
turbine engine. The flow rate of cooling water through the inner tube (Di = 25 mm) is
0.2 kg/s, while the flow rate of oil through the outer annulus (Do = 45 mm) is 0.1 kg/s. The oil and
water enter at temperatures of 100 and 30 C, respectively. The exit temperature of hot fluid and cold
fluid is 60 and 40 C. calculate the LMTD. Calculate the surface area of the heat exchanger. How
long must the tube?
Properties:
unused engine oil: cp = 2131 J/kg K, μ=3.25 ×10^-2 N.s/m^2, k = 0.138 W/m.K,
4178 J/kg .K, u= 725×10^-6 N.s/m2, k = 0.625 W/m.K, Pr = 4.85
water: cp
neer in which steam is condens
please... please. , how can I use the boundary conditions for this question (two fixed pates and the distance between plates is h).
None
Chapter 14 Solutions
Automotive Technology
Ch. 14 - What is the most efficient way to increase a...Ch. 14 - Explain why a pressure relief valve is needed in...Ch. 14 - List five problems that can be caused by engine...Ch. 14 - Describe the procedure for using air bleed valves...Ch. 14 - Describe the simple test used to determine whether...Ch. 14 - True or False? The presence of air in the cooling...Ch. 14 - True or False? Oil pressure is determined by...Ch. 14 - True or False? To eliminate the drain of engine...Ch. 14 - Which of the following is a function of the...Ch. 14 - For every pound of pressure put on engine coolant,...
Ch. 14 - Which is not a typical method of driving the water...Ch. 14 - Which of the following is not an effective way to...Ch. 14 - Cooling system hoses should be replaced when they...Ch. 14 - Which of the following is not a true statement...Ch. 14 - An engine overheats in traffic but is fine when...Ch. 14 - Technician A says that excessive engine oil...Ch. 14 - While checking for conditions that might cause...Ch. 14 - When discussing oil consumption: Technician A says...Ch. 14 - Technician A says that if the PCV valve or...Ch. 14 - While bleeding air from a cooling system:...Ch. 14 - While diagnosing an engine that overheats after...Ch. 14 - While performing a cooling system service on a...Ch. 14 - While discussing the causes of extreme engine...Ch. 14 - While diagnosing the cause of air bubbles in the...
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- Assignment 2. Example. The diffusivity of the vapour of a volatile liquid in air can be conveniently determined by Winkelmann's method in which liquid is contained in a narrow diameter vertical tube, maintained at a constant temperature, and an air stream is passed over the top of the tube sufficiently rapidly to ensure that the partial pressure of the vapour there remains approximately zero. On the assumption that the vapour is transferred from the surface of the liquid to the air stream by molecular diffusion, calculate the diffusivity of carbon tetrachloride vapour in air at 321 K and atmospheric pressure from the following experimental data: Time from commencement of experiment, (t x1 03 s) Liquid level (mm) 0.0 0.0 1.6 2.5 11.1 12.9 27.4 23-2 80-2 43.9 117.5 54-7 168.6 67.0 199.7 73-8 289-3 90-3 383-1 104.8 The vapour pressure of carbon tetrachloride at 321 K is 37.6 kN/m² and the density of the liquid is 1540 kg/m³. Take the kilogram molecular volume as 22.4 m³.arrow_forwardPlease.... please, provide me with full calculation (more details) because this question I sent it previously but I did not receive a good result yet.arrow_forwardSulphur dioxide is absorbed in a packed bed absorption tower with 25 mm ceramic Intalox saddles (packing factor of 300 m) using water solvent in a countercurrent arrangement. The feed gas contains 0.05 kmol SO-/kmol air, and it is desired to reduce the SO, content of exit gas to 3% of its inlet concentration. The gas flow rate is 0.067 kmol's of air, and the water rate is 3,08 kmol/s. The equilibrium relation is given by: Y= 30 X. Calculate: (a) number of transfer units; (b) column diameter, (c) the height of the packing. Assuming the entire process is gas-film controlled. Design for a pressure drop of 21 mm H-O/m packing. P = 1.21 kg/m: p = 1000 kg/m³: д, = 0.018×10-3 N.s/m² = 10³ N./m²; D₁ =1.45x10 m³/s; D₁ = 1.7x10m²/s. H=0.011, (Sc)( 0.305 111 De 2 3.05) 035 H₁ = 0.305 (Sc) K (305)arrow_forward
- م G ||| ٩٥٦٤:٠٣ رجوع ويسترن يونيون Western Union \\WU ۱۷۱ 1. LTE2 ملاحظة مهمة : عند استلام الاموال، يجب على المرسل ادخال نفس اسمك المسجل باللغة الانجليزية داخل التطبيق لاتمام العملية. تأكد من مشاركة هذا الاسم (AWWA ABD) مع المرسل . \\WU ارسل واستلم حوالتك من وإلى جميع أنحاء العالم بثواني. ارسال اموال استلام اموال تاريخ المعاملات قائمة المستلمين المسجلين احتساب رسوم التحويل =arrow_forwardPlease.... please, provide me with full calculation (more details) because this question I sent it previously but I did not receive a good result yet.arrow_forwardGeneralized Machine Theory Attempt ALL Questions. Q1. (a) Explain and illustrate the object of the performance analysis of any type of machine by unified theory. [8M]arrow_forward
- P10-21 When the impurity cumene hydroperoxide is present in trace amounts in a cumene feed stream, it can deactivate the silica-alumina catalyst over which cumene is being cracked to form benzene and propy- lene. The following data were taken at 1 atm and 420°C in a differential reactor. The feed consists of cumene and a trace (0.08 mol %) of cumene hydroperoxide (CHP). Benzene in Exit Stream (mol %) 1 (8) 2 1.62 1.31 1.06 0.85 0.56 0.37 0.24 0 50 100 150 200 300 400 500 == (a) Determine the order of decay and the decay constant. (Ans.: kg 4,27 x 10-3 s) (b) As a first approximation (actually a rather good one), we shall neglect the denominator of the cat- alytic rate law and consider the reaction to be first order in cumene. Given that the specific reac- tion rate with respect to cumene is k = 3.8 X 103 mol/kg fresh cat s atm, the molar flow rate of cumene (99.92% cumene, 0.08% CHP) is 200 mol/min, the entering concentration is 0.06 kmol/m³, the catalyst weight is 100 kg, and the…arrow_forwardICG Heterogeneous Catalysis Performance P10-3 t-Butyl alcohol (TBA) is an important octane enhancer that is used to replace lead additives in gasoline [Ind. Eng. Chem. Res., 27, 2224 (1988)]. TBA was produced by the liquid-phase hydration (W) of isobutene (I) over an Amberlyst-15 catalyst. The system is normally a multiphase mixture of hydrocar- bon, water, and solid catalysts. However, the use of cosolvents or excess TBA can achieve reasonable miscibility. The reaction mechanism is believed to be Derive a rate law assuming: I S (P10-3.1) I+S W.S (P10-3.2) WSZ W S+I SE TBA S+S (P10-3.3) TBA SZ TBA + S (P10-3.4) (a) The surface reaction is rate-limiting. (b) The adsorption of isobutene is limiting. (c) The reaction follows Eley-Rideal kinetics I SW TBA S (P10-3.5) and the surface reaction is limiting. (d) Isobutene (1) and water (W) are adsorbed on different sites. T + S₁ W + S₂ W. S₂ TBA is not on the surface, and the surface reaction is rate-limiting. Ans.: TBA=-= [CCW-CTBA/K]…arrow_forwardof cat- The cat- metric ength wate)? of the nds? the rate law is h. Redo parts (b) and (c) for these conditions. P10-20, The vapor-phase cracking of gas-oil in Example 10-6 is carried out over a different catalyst, for which would you recommend? with '=5x10-5 kmol kg-cat-s-atm (a) Assuming that you can vary the entering pressure and gas velocity, what operating conditions (b) What could go wrong with the conditions you chose? Now assume the decay law is da dt = kpacite with kp=100 dm³ at 400°C mol-s where the concentration, Cenke, in mol/dm³, can be determined from a stoichiometric table. (c) For a temperature of 400°C and a reactor height of 15 m, what gas velocity do you recommend? (d) The reaction is now to be carried in an STTR 15 m high and 1.5 m in diameter. The gas velocity is 2.5 m/s. You can operate in the temperature range between 100 and 500°C. What temperature do you choose, and what is the corresponding conversion? (e) What would the temperature-time trajectory look like…arrow_forward
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