on is 0.91 gcm and the heat capacity is 1.75 JgK'. Assume there is no heat loss in the pre-heater or between the pr .Draw a schematic of the pre-heater, detalling all mass and energy flows. .Clearly define a system boundary. Write the general energy balance, and a simplified energy balance stating all assumptions that apply to this problem.
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- Subject: Thermodynamics An air bubble rises from the bottom pf a water storage tank. The temperature at the surface of the bottom of the tank is 75°F rises to the surface where the temperature is 85°F. What is the percent inccrease in volume of the bubble if the height of water in the tank is 30ft and the atmospheric pressure is 14.7 psiaIn the United States, energy for household heating is generally sold using English units, e.g., therm, gal, and cord. A house in Wisconsin uses 1200 therms of thermal energy during the heating season. Calculate the cost of fuel if the furnace uses (a) natural gas with an efficiency of 70%; (b) No. 2 fuel oil, efficiency 65%; (c) kerosene, efficiency 99.9% (unvented); and (d) wood with l5% moisture with an efficiency of 50%. Use the data in Tables 2.2, 2.7, and 2.13. The efficiencies are based on the HHV. Assume the cost of natural gas is $8/MBtu, the cost of No. 2 fuel oil is $3/gal, the cost of kerosene is $3.50/gal, and the cost of wood is $100/cord. Assume the bulk density of cord wood is 30 lbm/ft3 .Water is being pumped the through one inch diameter piping arrangement to a higher elevation (5 meters up). Assume incompressible fluid conditions and some heat losses to the surroundings. At the inlet water pressure is 1 bar, temperature 15C, and volumetric flow rate is 0.02 m3/s. At the exit pressure is 2.2 bar, temperature is 10C and velocity of the stream is 40 m/s. Determine: a.Density of the inlet stream using NIST tables. b.Mass flow rate [kg/s] c.Determine h2 from known p2 and T2 using NIST tables d.Find heat rate removed from Q=m(h1-h2) Use Energy Balance Equation with enthalpy difference and in the units of kW to find pumping power in kW. NOTE: The heat is removed from the system, so it should be negative in your equation! show all steps please thanks
- Water is being pumped the through one inch diameter piping arrangement to a higher elevation (5 meters up). Assume incompressible fluid conditions and some heat losses to the surroundings. At the inlet water pressure is 1 bar, temperature 15C, and volumetric flow rate is 0.02 m3/s. At the exit pressure is 2.2 bar, temperature is 10C and velocity of the stream is 40 m/s. Determine: a.Density of the inlet stream using NIST tables. b.Mass flow rate [kg/s] c.Determine h2 from known p2 and T2 using NIST tables d.Find heat rate removed from Q=m(h1-h2) Use Energy Balance Equation with enthalpy difference and in the units of kW to find pumping power in kW. NOTE: The heat is removed from the system, so it should be negative in your equation! show all steps pleaseWater is being pumped the through one inch diameter piping arrangement to a higher elevation (5 meters up). Assume incompressible fluid conditions and some heat losses to the surroundings. At the inlet water pressure is 1 bar, temperature 15C, and volumetric flow rate is 0.02 m3/s. At the exit pressure is 2.2 bar, temperature is 10C and velocity of the stream is 40 m/s. Determine: a.Density of the inlet stream using NIST tables. b.Mass flow rate [kg/s] c.Determine h2 from known p2 and T2 using NIST tables d.Find heat rate removed from Q=m(h1-h2) Use Energy Balance Equation with enthalpy difference and in the units of kW to find pumping power in kW. NOTE: The heat is removed from the system, so it should be negative in your equation!7. Two parallel plates separated by 15.5 cm move with a relative velocity of 7 m/s. How much force per unit area is required to maintain the velocity difference if the fluid separating the plates is (a) water with µ = 1 cP (b) SAE 30 motor oil with µ = 200 cP and (c) honey with µ = 10,000 cP?
- A cylindrical tank (1.20m in diameter) contains two liquids with the follow specific gravities:LIQUID 1: oil (s.g.oil = 0.80)LIQUID 2: water (s.g.water = 1.00)Each specified liquid has a thickness of 0.60m with the denser liquid at the bottom. If a circular office is placed at the bottom of the tank (100mm in diameter and with c = 0.65) to drain the fluids: Compute for the time required to remove the denser liquid from the tankA cylindrical tank (1.20m in diameter) contains two liquids with the follow specific gravities:LIQUID 1: oil (s.g.oil = 0.80)LIQUID 2: water (s.g.water = 1.00)Each specified liquid has a thickness of 0.60m with the denser liquid at the bottom. If a circular office is placed at the bottom of the tank (100mm in diameter and with c = 0.65) to drain the fluids: Compute for the time required to remove the denser liquid from the tank. Hint/s: In evaluating the time to drain the more dense fluid, use the concept of equivalent pressure heads to evaluate hinitial and hfinal since there are multiple fluids in the container40. Water flows through a pipe of varying cross-section and varying elevation at the rate of 22.2m3/min. At one section of the pipe 3 m from the ground, the radius of the pipe is 36 cm and the pressure is 12 N/cm^2.What is the pressure at a section where the radius of the pipe is 18cm and is 0.7 m from the ground level?A. 136 123 N/m2 B. 50 N/cm2 C. 750 000 N/m2 D. 12 N/cm2
- An air-cooled condenser has an h value of 30 W/m2-K based on the air-side area. The air-side heat transfer area is 190 m2 with air entering at 27°C and leaving at 40°C. If the condensing temperature is constant at 49°C, what is the air mass flow rate in kg/s? Let Cp(air) = 1.006 kJ/kg-K. Draw and label the temperature-flow diagram. Round off your answer to three (3) decimal places.Calculate the pressure at depth 2 m using P = ρgh. p= (pressure) 19.855 kPa p= (density of the liquid) 1000 kg/m3 g= (gravity) 9.8 m/s2 h (height below the free surface of the liquid) 2mThe data listed below is from a passenger hot air balloon. The balloon is designed to lift 10-people (80 kg each person). The balloon consists of a basket, a burner- propane tank system. It will lift up when the cold air trapped inside warms up by the burner. Density of air inside the balloon is 99°C: 0.9486 kg/m³, density of air outside balloon is 20°C (ambient): 1.2041 kg/m³ Mass (kg) Balloon Basket Burner Propane tank 113.4 kg 63.5 kg 22.7 kg 183.7 kg Assume the balloon is a sphere shape, volume =(4/3)pi R3. a. Determine the minimum diameter of the balloon that would have a total lifting force to balance the weight of balloon, basket, burner, propane tank and 10 people? b. If the balloon is converted to survey the weather, it will be filled with hydrogen gas (H2). Assume the weight of the people (800kg) is now replaced by onboard equipment, what is minimum diameter needed to keep it afloat at 18km above the surface of the earth?