An electric heater is immersed in a well-stirred tank. Solvent at 19°C, which has a heat...
An electric heater is immersed in a well-stirred tank. Solvent
at 19°C, which has a heat capacity of 2.1 kJ/(kg°C), is fed at a
speed of 11 kg/h. The hot solvent is discharged at the same rate.
The tank initially contains 180 kg of cold solvent at 10°C. The
heat flow of the electric heater is 884 W.
Calculate the time for the temperature of the solvent being
discharged to be 63°C (write the answer in hours and with two
decimals)
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An electric heater is immersed in a well-stirred tank. Solvent
at 19°C, which has a heat...
An electric heater is immersed in a well-stirred tank. Solvent at 19°C, which has a heat...
An electric heater is immersed in a well-stirred tank. Solvent at 19°C, which has a heat capacity of 2.1 kJ/(kg°C), is fed at a speed of 11 kg/h. The hot solvent is discharged at the same rate. The tank initially contains 180 kg of cold solvent at 10°C. The heat flow of the electric heater is 884 W. Do the following: a) Draw the system with all its variables. b) Write the differential equation along with its initial condition. c)...
An electric heater is immersed in a well-stirred tank. Solvent at 19°C, which has a heat...
An electric heater is immersed in a well-stirred tank. Solvent at 19°C, which has a heat capacity of 2.1 kJ/(kg°C), is fed at a speed of 11 kg/h. The hot solvent is discharged at the same rate. The tank initially contains 180 kg of cold solvent at 10°C. The heat flow of the electric heater is 884 W. Write the differential equation along with its initial condition.
An electric heater is immersed in a well-stirred tank. Solvent at 17 ° C, which has...
An electric heater is immersed in a well-stirred tank. Solvent at 17 ° C, which has a heat capacity of 2.1 kJ / (kg ° C), is fed at a rate of 15 kg / h. The hot solvent is discharged at the same rate. The tank initially contains 120 kg of cold solvent at 6 ° C. The heat flow of the electric heater is 886 W. Do the following: Draw the system with all its variables Write the...
2. In the constant volume, stirred-tank heater shown in the figure below, the flow rates and...
2. In the constant volume, stirred-tank heater shown in the figure below, the flow rates and material properties are held constant. The tank contains a heating element, which is initially off and the tank is the same temperature as the inlet stream. When t=0, the heater is turned on to a constant heating rate Q. For this material, assume C = C = Cp = Cy. m,Ti P,V,C, T(t) ń, r(t) o a. Write a transient thermal energy balance to...
(3 points) Consider the two tank apparatus shown in the figure. Each tank has capacity 950950 liters and initially c...
(3 points)
Consider the two tank apparatus shown in the figure. Each tank
has capacity 950950 liters and initially contains 100100 liters of
fresh water. At time t=0t=0, the well-stirred mixing process
begins. Suppose that the concentration of brine flowing into Tank 1
via the top tube is 11 kilograms per liter, and that the flow rates
are r1=r3=4r1=r3=4 liters per minute, and r2=r4=13r2=r4=13 liters
per minute.
(a) Determine the volume of solution in each tank as a function of...
A. A rigid tank contains a hot fluid that is cooled while being stirred by a...
A. A rigid tank contains a hot fluid that is cooled while being stirred by a paddle wheel. Initially, the internal energy of the fluid is 800 kJ. During the cooling process, the fluid loses 500 kJ of work on the fluid. Determine the final internal energy of the fluid. Neglect the energy stored in the paddle wheel. B. Determine the power required for a 2000 kg car to climb a 100 m long uphill road with a slope of...
(1 point) Consider the two tank apparatus shown in the figure. Each tank has capacity 750...
(1 point) Consider the two tank apparatus shown in the figure. Each tank has capacity 750 liters and initially contains 150 liters of fresh water. At time t = 0, the well-stirred mixing process begins. Suppose that the concentration of brine flowing into Tank 1 via the top tube is 0.75 kilograms per liter, and that the flow rates are r = 13 = 3 liters per minute, and r2 = 14 = 10 liters per minute. (a) Determine the...
A bituminous coal is burned with air in a boiler furnace. The coal is fed at a rate of 40000 kg/h and has an ultimate analysis of 76wt% C, 5wt% H, 8wt% O, negligible amounts of N and S, and 11wt% non-...
A bituminous coal is burned with air in a boiler furnace. The
coal is fed at a rate of 40000 kg/h and has an ultimate analysis of
76wt% C, 5wt% H, 8wt% O, negligible amounts of N and S, and 11wt%
non-combustible ash. Air enters a preheater at 30 °C and 1 atm with
a relative humidity of 30%, exchanges heat with the hot flue gas
leaving the furnace and air enters the furnace at temperature Ta
(°C). The flue...
1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assum...
1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assuming that this demand will be covered with diesel boiler of average yield 0.8 (for diesel 1.12 tep/ton gas oil), they are: a) 30.1 tep/year, 26.9 ton/year b) 37.6 tep/year, 33.6 ton/year c)41.2 tep/year, 36.8 ton /year 1. 2. A hydraulic pump...
What are the desirable characteristics of a solvent to be used in the recrystallisation of a...
What are the desirable characteristics of a solvent to be used
in the recrystallisation of a solid product? (Hint: what is the
underlying purpose of doing recrystallisation, aside from making
the product look attractive?)
EXPERIMENT5 PREPARATION OF BENZOIC ACID Oxidation of a Primary Alcohol In this experiment, a primary alcohol (benzyl alcohol) is oxidised to a carboxylic acid (benzoic acid) by a strong oxidising agent (potassium permanganate) Because the synthesis reaction is carried out in basic conditions, the carboxylic acid...
2. In the constant volume, stirred-tank heater shown in the figure below, the flow rates and material properties are held constant. The tank contains a heating element, which is initially off and the tank is the same temperature as the inlet stream. When t=0, the heater is turned on to a constant heating rate Q. For this material, assume C = C = Cp = Cy. m,Ti P,V,C, T(t) ń, r(t) o a. Write a transient thermal energy balance to...
(3 points)
Consider the two tank apparatus shown in the figure. Each tank
has capacity 950950 liters and initially contains 100100 liters of
fresh water. At time t=0t=0, the well-stirred mixing process
begins. Suppose that the concentration of brine flowing into Tank 1
via the top tube is 11 kilograms per liter, and that the flow rates
are r1=r3=4r1=r3=4 liters per minute, and r2=r4=13r2=r4=13 liters
per minute.
(a) Determine the volume of solution in each tank as a function of...
(1 point) Consider the two tank apparatus shown in the figure. Each tank has capacity 750 liters and initially contains 150 liters of fresh water. At time t = 0, the well-stirred mixing process begins. Suppose that the concentration of brine flowing into Tank 1 via the top tube is 0.75 kilograms per liter, and that the flow rates are r = 13 = 3 liters per minute, and r2 = 14 = 10 liters per minute. (a) Determine the...
A bituminous coal is burned with air in a boiler furnace. The
coal is fed at a rate of 40000 kg/h and has an ultimate analysis of
76wt% C, 5wt% H, 8wt% O, negligible amounts of N and S, and 11wt%
non-combustible ash. Air enters a preheater at 30 °C and 1 atm with
a relative humidity of 30%, exchanges heat with the hot flue gas
leaving the furnace and air enters the furnace at temperature Ta
(°C). The flue...
1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assuming that this demand will be covered with diesel boiler of average yield 0.8 (for diesel 1.12 tep/ton gas oil), they are: a) 30.1 tep/year, 26.9 ton/year b) 37.6 tep/year, 33.6 ton/year c)41.2 tep/year, 36.8 ton /year 1. 2. A hydraulic pump...
What are the desirable characteristics of a solvent to be used
in the recrystallisation of a solid product? (Hint: what is the
underlying purpose of doing recrystallisation, aside from making
the product look attractive?)
EXPERIMENT5 PREPARATION OF BENZOIC ACID Oxidation of a Primary Alcohol In this experiment, a primary alcohol (benzyl alcohol) is oxidised to a carboxylic acid (benzoic acid) by a strong oxidising agent (potassium permanganate) Because the synthesis reaction is carried out in basic conditions, the carboxylic acid...
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