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- A performance test of an ice plant gave the following data: Capacity: 20 tons of ice/day Refrigerant: Ammonia Condenser pressure: 1391.5 kPa Evaporator pressure: 208.26 kPa Raw water temperature: 32OC Harvest temperature: -7OC Block of ice: 300 lb/block The compressor is twin-cylinder, single acting, D/L = 1.25, 450 rpm, mechanical efficiency is 80%. Additional heat load due to infiltration and conduction is 20%. Determine: a) Number of cans needed b) Product cooling load c) Refrigerating capacity in tons of refrigeration d) Amount of refrigerant flow e) Size of motor to drive the compressor f) Bore diameter and length of stroke1.1 Determine the electrical power supplied to a boiler when the temperature of the enteringwater is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is anegligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specificheat is c = 4,370 J/(Kg K). There is a 1.5(105) W rate of heat loss from the boiler during this process to asurrounding at 293.2 k. Consider steady state conditions.1.2 Calculate the total rate of entropy production in Problem 1.1.1.3 Calculate the total rate of exergy destruction (W) in Problem 1.1. The dead statetemperature is 293.2 K and pressure is 1 bar.1.4 Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to theconditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The highheating value (HHV) of the fuel is 50.02 MJ/kg.1.5 Calculate the exergy destroyed in the process described by problem 1.4. The exergy…1.1 Determine the electrical power supplied to a boiler when the temperature of the enteringwater is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is anegligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specificheat is c = 4,370 J/(Kg K). There is a 1.5(105) W rate of heat loss from the boiler during this process to asurrounding at 293.2 k. Consider steady state conditions.1.2 Calculate the total rate of entropy production in Problem 1.1.1.3 Calculate the total rate of exergy destruction (W) in Problem 1.1. The dead statetemperature is 293.2 K and pressure is 1 bar.1.4 Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to theconditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The highheating value (HHV) of the fuel is 50.02 MJ/kg.1.5 Calculate the exergy destroyed in the process described by problem 1.4. The exergy…
- . A meeting hall is to be maintained at 25°C, 18Cwb. The space has a cooling load of 40kW of which 32kW is sensible cooling load. The temperature of the supply air to the space must not be lowered than 18°C. Outdoor conditions are 35°C, 50% RH. Assume that 75% by weight of the supply air from the room is recirculate but a portion of these bypassed the cooling equipment. Determine a) amount of air supplied to the space b) TOR required of the cooling equipment c) average cooling coil surface temperature.An A/C plant is designed for a room with the following conditions: outdoor conditions 40 F db / 60% r.h., requiredindoor conditions 70 F db / 50% r.h., amount of air circulation 15 ft^3/min/person, room capacity 50 people. Therequired condition is achieved first by heating and then by adiabatic mixing. Show the pro cess on an e-version ofa psych-chart, and thus determine the following:a. Heating capacity of the coil (BTU/min)b. Capacity of the humidifier (lbm/min)Design, analyze, and optimize a triple pressure heat recovery steam generator (HRSG) for a large advanced combined cycle power plant whose net steam power output is 150 MW. The gas turbine exhaust gases can be treated as ideal gases and the outlet temperature and mass flow rate are 550°C and 500 kg/s respectively. Water enters a low-pressure economizer for this HRSG at P = 200 kPa and T = 40°C. Make reasonable assumptions as required.
- Pls. Answer thank you! A cooling tower has an efficiency of 65%. Water enters the tower at 55°C. The wet bulb temperature of surrounding air is 27°C. What is the temperature of water leaving the tower?An office to be air conditioned for 50 staff when the outdoor conditions are 30°cDBT and 75% RH if the quantity of air supplied is 0.4m3/min/per find i) Capacity of cooling coil ii) capacity of heating coil iii) amount of water vapourremoved per hour. Assume that required air inlet conditions are 20°c DBT and 60% RH air is conditioned first by cooling and dehumidifying and by heating. Ifthe heating coil surface temperature is 25°c, find the bye pass factor of the heating coil.1- what's is the main benefit for the cooling tower packages . 2- compare the value of heat that rejected from water with the heat adding to the air and explain the Couse of difference . 3- make a search about cooling tower deals with the following items , a) the kind of cooling tower ., b) the problems that resisted the work of the cooling tower . c) define the approach and pointed the condition that deepened on .
- A group is considering installing a solar power station and has asked you for your recommendation if it should be a photovoltaic system or a solar thermal system. At this stage you are asked not to include cost factors. The single point design condition they have given you is for an incident solar radiation on the collector of 550 W/m2, a surrounding temperature of 18 C. The dead state for this problem should be taken as To = 291 K, Po = 1 bar. You can perform your analysis at steady state conditions. In addition to determining the power output and first law efficiency of the options, you have been requested to determine the exergy destroyed for each of them. The photovoltaic system has an efficiency of 0.15 defined as the power output/incident solar radiation. The basic photovoltaic collector is 1.1 m2 and losses heat from both the front and back surface. The edge area can be neglected. The convective heat transfer coefficient is 10 W/m2 K. The inverter and signal…A group is considering installing a solar power station and has asked you for your recommendation if it should be a photovoltaic system or a solar thermal system. At this stage you are asked not to include cost factors. The single point design condition they have given you is for an incident solar radiation on the collector of 550 W/m2, a surrounding temperature of 18 C. The dead state for this problem should be taken as To = 291 K, Po = 1 bar. You can perform your analysis at steady state conditions. In addition to determining the power output and first law efficiency of the options, you have been requested to determine the exergy destroyed for each of them. The photovoltaic system has an efficiency of 0.15 defined as the power output/incident solar radiation. The basic photovoltaic collector is 1.1 m2 and losses heat from both the front and back surface. The edge area can be neglected. The convective heat transfer coefficient is 10 W/m2 K. The inverter and signal conditioning…A meeting hall is to be maintained at 25°C, 18Cwb. The space heat gains dropped to 20kW of which 16kW is sensible cooing load. Outdoor conditions are 35°C, and 50% RH. Assume that 10% by weight of the supply air to the room is outdoor air. The recirculated air passed through a cooling equipment and then mixed with the outdoor, and the conditioned air is supplied to the room at temperature not lowered than 18°C. Determine a) amount of air supplied to the space b) TOR required of the cooling equipment c) average cooling coil surface temperature