6. A Thomas meter is located in an air duct of 2 sq ft cross-sectional area. The air weighs 0.083 lb per cu ft, and its specific heat is 0.24. Assume a controlled temperature differential of 5° and heater potential of 110 volts. Plot the velocity as abscissa and amperage as ordinate for veloc- ity 0 to 300 ft per min. Assume constant amperage of 3, and plot tem- perature difference against velocity. Discuss the curves from the stand- point of accuracy of the system.
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- A Thomas meter is located in an air duct of 2 sq ft cross-sectional area. The air weighs 0.083 lb per cu ft, and its specific heat is 0.24. Assume a controlled temperature differential of 5° and heater potential of 110 volts. Plot the velocity as abscissa and amperage as ordinate for veloc- ity 0 to 300 ft per min. Assume constant amperage of 3, and plot tem- perature difference against velocity. Discuss the curves from the stand- point of accuracy of the system.A six-cylinder refrigerant 22 compressor operating at 29 r/s indicate a refrigerating capacity of 96.4 kW and a power requirement of 28.9 kW at an evaporating temperature of 5°C and condensing temperature of 50°C. The performance data are based on 3°C liquid sub-cooling and 8°C superheating of the suction gas entering the compressor. The cylinder bore is 67 mm and the piston stroke is 57 mm. Compute (a) the clearance volumetric efficiency if the clearance volume is 4.8 percent, (b) the actual volumetric efficiency, and (c) the compression efficiency.(a) Compare flat plate, parabolic collectors to be used for a solar thermal plant with respect to (i) temperature, (ii) concentration ratio, (iii) suitability, and (iv) absorber type. (b) A tidal power plant of single basin type, has a basin area of 25 x 10 to power 6 m2. The tide has a range of 10m. The turbine however, stops operating when the head on it falls below 2 m. Calculate the energy generated in one filling process, in KWh if the turbine generator efficiency is 75%. (Density of sea water = 1025 kg/m2)
- A straight-charged Thermostatic Expansion Valve (TEV) is designed to operate at an evaporator temperature of 6⁰C with a degree of superheat of 4⁰K. R134a is the refrigerant used in the refrigeration system as well as the bulb. Find: (a) The required spring pressure at the design condition; (b) Assuming the spring pressure to remain constant, find the degree of superheat, if the same TEV operates at an evaporator temperature of –20⁰C. The saturation pressure of R134a can be estimated using Antoine’s equation given by: Psat = exp(14.41 – (2094/(T – 33.06)), where: P is in kPa and T is in ⁰K Step by step solution please!!!Table Q3 is given to collect the temperature of hot and cold water at the inlet and outlet positions in the laboratory using Tube Heat Exchanger (TD360a) by varying the cold-water flow rate to investigate the effect of cold-water flow rate on the heat exchanger’s performance. (a) Complete all the output parameters indicated in the table given in Appendix 1. (b) Draw the temperature (TH1, TH2, TC1 and TC2) on the vertical vs position (1, 2) on the horizontal axis for each flow and discuss the effect of cold water flow rate change on the exit temperature of both cold water and hot water. (c) Draw the graph of Energy Balance Coefficient and Mean Temperature Efficiency on vertical axis and cold-water flow rate on horizontal axis. Discuss the effect of flow rate on the Energy Balance Coefficient and Mean Temperature Efficiency based on your finding.The condensing pressure for a Rankine engine is 0.001325 MPavac. Calculate the following for steam flow rate = 1 kg/sec of steam when the steam at the beginning of expansion is at 119.6 deg SH and 4.0 Mpaa. Draw the TS and equipment diagrams for the ideal and actual case and find for the following for the ideal case: Ideal turbine work (KW). Ans.____________________________ Heat rejected at condenser (KJ/sec). Ans.____________________________ Mass of cooling water in kg/sec if cp H2O = 4.18 KJ/kg-K, and inlet temp of water to condenser = 20 deg C, outlet temp is 35 deg C. Ans.____________________________ Pump work in KW. Ans.___________________________
- An ammonia compressor of an ice plant is driven by 175 kW electric motor. The belt transmission efficiency is 94.5% while the mechanical efficiency of the compressor is 85%. The water used in making ice is supplied to the 300-lb block ice per can at 18OC temperature and ice leaves the plant at -6.5OC. The coefficient of performance is 2.0. Heat losses conducted into the brine are 15% of the chilling and freezing load. Calculate: a) The refrigeration capacity b) The ice plant capacity c) The number of ice cans needed if brine temperature is -7.50OC.The figure 1 above presents a crudely simplified centralised water heating system. The system comprises of two heating lines, the first line having one radiatorand the second has four radiators in series.The pressure after the pump (point (1)) is 2 bar, and the flow velocity is 1.2 m/s. For simplicity we can assume the water to be in constant temperature of 60◦C. Loss coefficients and pressure losses are listed in Table 1, and pipe lengths and diameters are given in Table 2.For the system balancing, the target is to divide the mass flow so, so that 20% of the mass flow goes to the first line (i.e. through radiator R1.1) and 80% of the flow goes to the second line (R2.1 - R2.4):(a) How large pressure loss is needed in the control valve CV1 to get the desired flow rates in the two lines? (b) How large is then the minor loss coefficient of the said valve, KCV1? (c) How much is the pressure, in bar, at the end of the line at section 4?A fan require at least 4.5 hp to deliver 18,000 CFM of air running at 320 rpm. For a service factor of 1.15, find the designed horsepower of the sprocket.
- The temperatures of the 20 ºC 25 ºC 30 ºC water at outlet Task 1 Explain the system parameters using the Non- Flow Energy EquationFor the purpose of acting as an air-cooled water chiller, an ammonia refrigerant vapor compression system is deployed. It is functioning with an evaporator temperature of 0 degrees Celsius and a condenser temperature of 40 degrees Celsius. The refrigeration produced by the system is equal to 15 tons.Find out: a. The temperature of the discharge and the mass flow rate of the refrigerant that is being circulated.b. The piston displacement that can be considered theoretical for the compressor.c. The work that can be done by the theoretical compressor.d. The heat that is not allowed to escape through the condenser.e. The Carnot coefficient of performance and the actual COP of the cycle.f. The volume of air that is supplied in the condenser if the air comes in at 30 degrees Celsius and exits at 34 degrees Celsius.g. The LMTD and AMTD of the condenser h. The water flow rate of the chiller assuming that the water enters the evaporator at 10 degrees Celsius and exits at 5 degrees Celsiusi. The…An ice plant produces 10 tons of ice per day at 0°C using water at room temperature of 27°C. Estimate the power rating (Electrical Power consumed by the motor to run compressor) of the compressor-motor, if the C.O.P. of the plant is 3.0 and overall electro-mechanical efficiency (η) is 91%. Note: Latent heat of ice is 335 kJ/kg, Cp = 4.18 kJ/kg.K.