Interested to Buy Any Domain ? << Click Here >> for more details...
Topic :: Heat
Heat transfer: In a triple effect evaporator, the heat transfer for an evaporator is calculated as q = UA (TI - TF) where TI is the initial temperature, TF is the final temperature; U and A are constants. Given that heat transfer for the first evaporator : q(1) = UA (TI - TB); second evaporator : q(2) = UA (TB - TC); third evaporator : q(3) = UA (TC - TF) where q(x) is the heat transfer function, TB is the temperature of second inlet and TC is the temperature of third inlet, prove that the overall heat transfer Q = q(1) q(2) q(3) = UA (TI - TF).
1 2649Heat transfer: In a steady state one dimensional conduction with no heat generation, the differential equation is d / dx (k dT / dx) = 0. Prove that T(x) = ax b, where k, a and b are constants. (b) At x = 0, T = c and at x = L, T = d. Prove that T(x) = (d - c) x / L c for boundary conditions.
1 2212PROCESS CONTROL - EXAMPLE 6.2 : A stream with volumetric flow rate Q enters a cylindrical tank and a stream with volumetric flow rate q exits the tank. The fluid has a constant heat capacity and density. There is no temperature change or chemical reaction occurring in the tank. Develop a model for determining the height of the tank, h. Let V is the volume, A is the cross sectional area, r is the density, m is the mass, where V and A are for the tank, r and m are for the fluid. The rate of mass of fluid accumulation, dm / dt = (Q - q) r. Prove the model to be dh / dt = (Q - q) / A.
1 2242HEAT TRANSFER - EXAMPLE 5.3 : In a cylinder with a hollow, let a is outside radius and b is the inside radius. In a steady state temperature distribution with no heat generation, the differential equation is (d / dr) (r dT / dr) = 0 where r is for radius and T is for temperature. (a) Integrate the heat equation above into T(r) in term of r. (b) At r = a, T = c; at r = b, T = d. Find the heat equation of T(r) in term of r, a, b, c, d.
1 2386How to calculate heat load .For example 10 TR .Then how we will find load (we want rh(relatavie humidity) sir)
1593UNIT OPERATION - EXAMPLE 9.1 : Which of the sequence below represent a feasible flows of ethanol processing plants using cellulose as starting material? A. raw material -> heat exchanger -> distillation column -> reactor. B. reactor -> distillation column -> raw material -> heat exchanger. C. heat exchanger -> raw material -> distillation column -> reactor. D. raw material -> heat exchanger -> reactor -> distillation column. E. distillation column -> raw material -> reactor -> heat exchanger.
1 2258THERMODYNAMIC - EXAMPLE 10.1 : The water is superheated steam at 440 degree Celsius and 17.32 megapascals. Estimate the enthalpy of the steam above. From the steam table for water at 440 degree Celsius, enthalpy of steam, h at 18 megapascals is 3103.7 kilojoules per kilogram and at 16 megapascal is 3062.8 kilojoules per kilogram. Assume that h = mP + c where P is pressure; m and c are constants at fixed temperature with small differences in P.
1 2215THERMODYNAMIC - EXAMPLE 10.2 : A cylinder with a movable piston contains 0.1 mole of a monoatomic ideal gas. The piston moves through state a, b and c. The heat Q, changes from state c to a is + 685 J. The work W, changes from state c to a is - 120 J. The work, W performed from state a to b then to c is 75 J. By using the first law of thermodynamic, U = Q + W where U is the internal energy : (a) Determine the change in internal energy between states a and c. (b) Is heat added or removed from the gas when the gas is taken along the path abc? (c) Calculate the heat added or removed when the gas is taken along the path abc?
1 2393CHEMICAL ENERGY BALANCE - EXAMPLE 11.2 : Calculate the cooling duty, H required to condense and cool acetone from 100 degree Celsius to 25 degree Celsius at atmospheric pressure. The heat of vaporization for acetone at its normal boiling point is 30.2 kJ / mol. The boiling point of acetone at atmospheric pressure is 56 degree Celsius. The flowrate of acetone through the condenser is 100 mol / s = N. Value of sensible heat needed to increase the temperature of acetone in liquid form from 25 to 56 degree Celsius is 4.06 kJ / mol. Value of sensible heat needed to increase the temperature of acetone in vapor form from 56 to 100 degree Celsius is 3.82 kJ / mol. Unit of H is kJ / s.
1 2313ELECTRICAL TECHNOLOGY - EXAMPLE 16.1 : According to Shockley equation, the I - V characteristic of a diode is approximated by I = IS [ exp (nVD / VT) - 1 ]. For silicon, let the reverse bias saturation current IS as 0.000000000001. If n is ideality factor with value of 1.5, VT as thermal voltage drop of 0.026 V at room temperature, what is the value of current I that passes through the silicon diode in the heater of evaporator when the forward voltage drop VD = 0.026 V? Please take note that exp is the exponential function with e(1) = 2.718, e(2) = 7.389.
1 2369ELECTRICAL TECHNOLOGY - EXAMPLE 16.2 : In a selection of suitable heating equipment for drying of crystals of biochemical, the one of the lowest current consumption will be chosen for safety consideration. Selection is available : (A) 120 V microwave oven 1800 W. (B) 240 V conventional oven 11000 W. Which one should be chosen and why?
1 2075PROCESS DESIGN - EXAMPLE 21.2 : The names of the flow streams could be represented by : H1 for first hot stream, H2 for second hot stream, C1 for first cold stream, C2 for second cold stream. Data of supply temperature Ts in degree Celsius : 150 for H1, 170 for H2, 30 for C1, 30 for C2. Data of target temperature Tt in degree Celsius : 50 for H1, 169 for H2, 150 for C1, 40 for C2. Data of heat capacity Cp in kW / degree Celsius : 3 for H1, 360 for H2, 3 for C1, 30 for C2. (a) Find the enthalpy changes, dH for all streams of flow H1, H2, C1 and C2 in the unit of kW. Take note of the formula dH = (Cp) (Tt - Ts). (b) Match the hot streams H1 and H2 with the suitable cold streams C1 and C2 to achieve the maximum energy efficiency.
1 2346
Why is post-weld heat treatment sometimes necessary for welded vessels?
What are some good estimates for heat transfer coefficients for coils in tanks?
At which growth stage of wheat maximum biological nitrogen fixation occurs?
What does i. Salt ii. Vinegar iii. Heat iv. Sugar v. Very cold vi. Drying vii. Pressurization viii. Preservatives ix. Radiating do to the food? in regards to preserving food.
while design of heat exchanger,what r the factors keep in mind?
if there is a web table of having row and colmns.a button is placed at 2nd row's 3rd column which is worked for both edit and delete..how to write script for the button to test both operation on the web table using desriptive programing.. plz help me on script wheather using getroproperty Q2)what is the command for taking valiue from a web table in qtp
test cases test wheather window? test cases to test calculaor? test cases to test a reverse string program? test cases to test program{ int.parse(sting str) $return (int)}? test cases to test program{display string length}?
When we are calculating the heat load sheets,why we are not considering the heat developed from the blood in the human body.Also both men & women can't acess aircondition in same way..women feel too cool even at 22 degree,while men can overcome that.
Re: Sugar Cane Bagasse What are the 1. Specific Heat of Bagasse at 50% moisture, 40% moisture and 25% moisture? 2. What is bu;lk density of bagasse at 50% moisture, 40% moisture and 25% moisture? 3. What is specific gravity of bagasse at 50% moisture, 40% moisture and 25% moisture? 4. What is the specific heat of flue gases generated from boiler fuelled by bagasse? 5. What is the specific gravity of flue gases generated from boiler fuelled by bagasse?
2. You are required to prepare a Profit & Loss Account for the year ending 31st December, 2007 and the Balance Sheet on that date. The Trial Balance of XYZ Ltd. for the year ended 31st December 2007 is as follows:- Trial Balance of XYZ Ltd. as on 31st Dec. 2007 Debit Balances Rs. Credit Balances Rs. Materials used 3,50,000 Sales(including 2% Sales tax) 9,18,000 Cost of Labour 1,50,000 Sale of Scrap 100 Stock, finished and work in process on 31st December, 2006 50,000 Rent received 2,000 Wages : Factory Staff 15,000 Discounts 2,750 Directors Remuneration 50,000 Recovered against fire claim re : Stock 5,000 Salaries : Clerical Staff 75,000 Capital : Equity 25,000 Insurances : Workmen’s Compensation 1,500 Preference- 9% 8,000 General, fire etc. 2,000 Creditors 1,56,000 Directors’ Life Insurance 1,500 Provision for Taxation 1,05,000 Maintenance : Buildings 1,000 Profit & Loss Account 13,750 Plant and Machinery 12,500 Rent and Rates of premises and hire of plant 20,000 Heat, Light and Power 15,000 Experimental and Laboratory Expenses 10,000 Canteen Expenses 5,000 Staff Welfare expenses 2,500 Motor Expenses 12,500 Professional Charges 2,800 Postage and Telephone 3,500 Books, Printing and Stationery 11,000 Sundry expenses 10,000 Carriage and Packing on Sales 3,300 Discounts 5,000 Debtors 1,78,000 Freehold Property 50,000 Plant and Machinery 12,500 Fixtures and Fittings – Offices 3,500 Office machinery and Equipment 3,000 Motor Car and Van 6,500 Stock of materials on 31st Dec. 2007 1,20,000 Bank 38,000 Sales Tax Paid 15,000 12,35,600 12,35,600 Depreciation is to be provided at the following rates: Plant and Machinery 10% Fixture and Fittings 05% Office Machinery, etc. 10% Motor Vans and Cars 25% The stock of finished goods and work in progress as on 31st December, 2007 was Rs. 35,000. Provide for preference dividend and ordinary dividend at 10%. The total taxation liability is estimated at Rs.1,50,000 of which Rs. 75,000 relates to the current year. Debtors include Rs. 10,000 deposited as security against government contracts. The Works Manager is paid partly by salary and partly by a commission; he is entitled to a commission of 5% on the amount by which the surplus in the factory cost exceeds 20% of the sales for the period. Charge the commission if any in the Profit and Loss Account.
THIS IS HARI PRASAD. I KNOW THAT HVAC MEANS HEATING VENTILATION & AIR- CONDITIONING. I NEED DESIGN CONSIDERATION OF HVAC UNIT.
Two liquids hot and cold in two vessels are there and an metal bar acts as a conductor of heat between the two vessels. what happens then. what happens after 24 hrs?
wheather the size of windings in motor and generator are the same
In the calculation of calorific value of any fuel why the latent heat of vap. of water is taken as 587 kj/mol whereas actually it is 540kj/mol?
In between UPS out going changer over switch and ups raising main input, both side cable gland producing heat but the cable doesn't get heat,Why?
