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In a counter-flow heat exchanger, water is heated at the rate of 1.5kg/s from 40°C to 80°C by an oil entering at 120°C and leaving at 60°C. The specific heats of water and oil are 4.2kJ/kg/K and 2kJ/kg.K respectively. The overall heat transfer coefficient is 400 W/m2 .K. The required heat transfer surface area (in m2) is1 AnswerIn a counter-flow heat exchanger, water is heated at the rate of 1.5kg/s from 40°C to 80°C by an oil entering at 120°C and leaving at 60°C. The specific heats of water and oil are 4.2kJ/kg/K and 2kJ/kg.K respectively. The overall heat transfer coefficient is 400 W/m2 .K. The required heat transfer surface area (in m2) is1 AnswerHot water at 95 C is used in a plate heat exchanger for heating 2 kg s^-1 fruit juice from 45C to 75C. Specific heat capacity of fruit juice is 3.7 kJ kg^-1 K ^-1. Final temperature of the hot water is 70C. Overall heat transfer coefficient is 1122 W1 AnswerConsider a parallel-flow heat exchanger with area 𝐴p and a counter-flow heat exchanger with area 𝐴c . In both the heat exchangers, the hot stream flowing at 1 kg/s cools from 80 C to 50 C. For the cold stream in both the heat exchangers, the fl1 AnswerA heat pump absorbs 10kW of heat from outside environment at 250 K while absorbing 15 kW of work. It delivers the heat to a room that must be kept warm at 300K. The coefficient of Performance (COP) of the heat pump is _________.1 AnswerA calorically perfect gas (specific heat at constant pressure 1000 J/kg.K) enters and leaves a gas turbine with the same velocity. The temperatures of the gas at turbine entry and exit are 1100 K and 400 K, respectively. The power produced is 4.6 MW and heat escapes at the rate of 300 kJ/s through the turbine casing. The mass flow rate of the gas (in kg/s) through the turbine is1 AnswerA reversible cycle receives 40 kJ of heat from one heat source at a temperature of 127 C and 37 kJ from another heat source at 97 C. The heat rejected (in kJ) to the heat sink at 47 C is __________ Gate-20161 AnswerMass transfer coefficient for equimolar counter-diffusion of water vapour in air is 0.4 m s^-1(based on concentration difference). Mass diffusivity of water vapour in air is 3 ×10-4 m^2s^-1. For 100 µm diameter droplet, the Sherwood Number (NSh) is1 AnswerA pipe of 25mm outer diameter carries steam. -gate-mechanical-20111 AnswerThe contents of a well-insulated tank are heated by a resistor of 23Ω in which 10A current is flowing. -gate-mechanical-20111 AnswerPlot a graph showing the variation of specific heat of water with temperature. Physics Cbse class 11 20161 AnswerFill in the blanks. GATE- Chemical Engineering- 20131 AnswerMilk enters into the heating section of a high temperature short time (HTST) pasteurizati on plant at a temperature of 45ºC and leaves at 72 ºC. Hot water at temperature of 95 ºC enters counter - currently into the heat exchanger 1 AnswerA 2.5 m long pipe is insulated at both ends. It has ID and OD as 50 mm and 56 mm, respectively. Its log-mean heat transfer area in m2 is ________________ Gate-Agricultural-20161 AnswerI Fill in the blanks 1. ________________ is the primary mode of heat transfer in Solids. 2. Bases are bitter to taste whereas acids are ______________ . 3. Silk is obtained from the ________________ of silkworms. 4. Amoeba digests its food in the _________________ . 5._____________ are tiny pores present on the leaf surface to breathe in air. - NCERT CLASS 6TH CBSE ENGLISH 20160 AnswerThe heat loss from a fin in 6W. The effectiveness and efficiency of the fin are 3 and 0.75, respectively. The heat loss (in W) from the fin, keeping the entire fin surface at base temperature, is ________.1 AnswerFill in the blanks. GATE- Metallurgical Engineering- 20131 AnswerIn a steam condenser the inlet and exit temperature of the odd stream are 20 and the steam condenses on outside surface of the tube.1 AnswerThe heat removal rate from a refrigerated space and the power input to the compressor are 7.2 kW and 1.8 kW, respectively. The coefficient of performance (COP) of the refrigerator is ______ Gate-20161 AnswerA solid sphere of radius r1 = 20 mm is placed concentrically inside a hollow sphere of radius r2 = 30 mm as shown in the figure. (Gate mechanical engineering 2014)1 Answer