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Topic :: Heat
Question 40 - 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 2684Question 46 - 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 2465Question 47 - 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 2277In one plant id fan and fd fan are used for boiler. boiler is used to heat water after some days they install one tank to heat water by hot flue gases coming out from boiler and then hot flue gases are used to heat the air coming from fd fan before leaving out from chimney . but hot flue gases are not coming out from id fan what might be the reason?
TATA,
3 4681Question 62 – 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 2161Question 64 – According to a heuristic of chemical engineering plant design, assume a pressure difference dP = 4 psi for each 10-ft rise in elevation. A pump is needed to pump liquid from a storage tank at a lower elevation to a heating tank at a higher elevation with the elevation difference of 60 ft. (a) Find the pressure loss due to such elevation. (b) If the required minimum inlet pressure to the heating tank is 9 psi, with 1 control valve is installed between pump and heating tank, what is the dP minimum required for the control valve and the entrance to the heating tank when the heuristic mentions that at least 10 psi is required for the control valve? (c) The pressure at the inlet of the pump is 8 psi and the flowrate of the liquid produces pressure head of 50 psi. What is the total pressure produced by the pump? (d) Assume a pipeline dP of 2 psi / 100 ft for liquid flow in a pipe according to heuristic, what is the approximate maximum length of the pipe in ft that can be installed between the pump and the heating tank?
1 2528Question 72 - (a) According to United States Department of Agriculture (USDA) (http://ndb.nal.usda.gov/ndb/search/list, accessed 12 August 2016), 100 g of potatoes generate 77 kcal of energy. For raw tomatoes, 111 g have 18 kcal of energy. Question : How much energy will one gain if 150 g of heated potatoes are eaten with 200 g of raw tomatoes? (b) If 1 Calorie = 1 food Calorie = 1 kilocalorie and 1000 calories = 1 food Calorie, then how many Calories are there in 9600 calories? (c) According to a food package of potato chips, 210 Calories are produced per serving size of 34 g. In actual experiment of food calorimetry lab, 1.75 g of potato chips, when burnt, will produce 9.6 Calories. For each serving size of potato chip, find the difference of Calories between the actual experimental value and the value stated on the food package. (d) The specific heat of water is c = 1 cal / (g.K) where cal is calory, g is gram and K is Kelvin. Then what is the temperature rise of water, in degree Celsius, when 150 g of water is heated by 9600 calories of burning food?
1 2756Question 73 - (a) A dryer reduces the moisture content of 100 kg of a potato product from 80 % to 10 % moisture. Find the mass of the water removed in such drying process. (b) During the drying process, the air is cooled from 80°C to 71°C in passing through the dryer. If the latent heat of vaporization corresponding to a saturation temperature of 71°C is 2331 kJ / kg for water, find the heat energy required to evaporate the water only. (c) Assume potato enters at 24°C, which is also the ambient air temperature, and leaves at the same temperature as the exit air. The specific heat of potato is 3.43 kJ / (kg °C). Find the minimum heat energy required to raise the temperature of the potatoes. (d) 250 kg of steam at 70 kPa gauge is used to heat 49,800 cubic metre of air to 80°C, and the air is cooled to 71°C in passing through the dryer. If the latent heat of steam at 70 kPa gauge is 2283 kJ / kg, find the heat energy in steam. (e) Calculate the efficiency of the dryer based heat input and output, in drying air. Use the formula (Ti - To)/(Ti - Ta) where Ti is the inlet (high) air temperature into the dryer, To is the outlet air temperature from the dryer, and Ta is the ambient air temperature.
1 5907Consider three heater bank connected in 3 phase star with neutral.Each heater bank connected in each phase.So each phase get 230 volts supply.my question is,during balance condition, current flow in neutral or Not
1594Question 80 - Liquid octane has a density of 703 kilograms per cubic metre and molar mass of 114.23 grams per mole. Its specific heat capacity is 255.68 J / (mol K). (a) Find the energy in J needed to increase the temperature of 1 cubic metre of octane for 1 Kelvin. (b) At 20 degree Celsius, the solubility of liquid octane in water is 0.007 mg / L as stated in a handbook. For a mixture of 1 L of liquid octane and 1 L of water, prove by calculations that liquid octane is almost insoluble in water.
1 2978MASS TRANSFER - EXAMPLE 4.1 : A concentric, counter-current heat exchanger is used to cool lubricating oil. Water is used as the coolant. The mass flow rate of oil into the heat exchanger is 0.1 kg / s = FO. For oil, the inlet temperature TIO = 100 degree Celsius and the outlet temperature TOO = 55 degree Celsius. For water, the inlet temperature TIW = 35 degree Celsius and the outlet temperature TOW = 42 degree Celsius. What is the mass flow rate of water in kg / s, FW needed to maintain these operating conditions? Constant for heat capacity of oil is CO = 2131 J /(kg K) and for water is CW = 4178 J /(kg K). Use the equation (FO)(CO)(TIO ?TOO) = (FW)(CW)(TOW ?TIW).
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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?
