The essential component of a toaster is an electrical element (a resistor) that converts electrical energy to heat energy. How much current is drawn by a toaster with resistance 12W at 110V?
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- A vacuum refrigeration system consists of a large insulated flash chamber kept at low pressure by steam ejector which pumps vapor to a condenser. Condensate is removed by condensate to an air vent. Warm return water enters the flash chamber at 13oC, chilled water comes out of the flash chamber at 5oC Vapor leaving the flash chamber has a quality of 0.97 and the temperature in the condenser is 32oC. For 350 kw of refrigeration How much vapor must the steam ejector remove from the flash chamber?A vacuum refrigeration system consists of a large insulated flash chamber kept at low pressure by steam ejector which pumps vapor to a condenser. Condensate is removed by condensate to an air vent. Warm return water enters the flash chamber at 13oC, chilled water comes out of the flash chamber at 5oC Vapor leaving the flash chamber has a quality of 0.97 and the temperature in the condenser is 32oC. For 350 kw of refrigeration How much make-up water is needed?A vacuum refrigeration system consists of a large insulated flash chamber kept at low pressure by steam ejector which pumps vapor to a condenser. Condensate is removed by condensate to an air vent. Warm return water enters the flash chamber at 13oC, chilled water comes out of the flash chamber at 5oC Vapor leaving the flash chamber has a quality of 0.97 and the temperature in the condenser is 32oC. For 350 kw of refrigeration A) How much chilled water at 5oC does this system provide? B) How much make-up water is needed? C) How much vapor must the steam ejector remove from the flash chamber?
- Water is extract from underground water source whose free surface is 20m below the ground level. The diameter of the pipe is 10 cm in and 30 cm at the exist. What is the 80kg/sec (kw)?A 61 m rm of 203.2 mm pipe carrying 7.03 kg/cm^2 ga steam is drained by one steam trap. Find the capacity, kg per hr for running operation. The pipe is covered with insulation of 0.962 efficiency and is laid in a trench where the ambient ai temperature is probably 54.4 °C.Water with a specific heat of 1 BTU/lbmoF is pumped using a 1-hp jet pump from a well that is 20 ft deep into a vented water vessel 160 ft above the ground. In the process, 400 BTU/min of heat is lost from the system. What is the temperature (oF) of the water as it enters the vessel if the flow rate of the water is 5 gal/min? Assume the temperature of water in the well is (35oF).
- Refrigerant vapor rejects 70 kW of heat as it passes through an air-cooled condenser. The condenser has an air-side area of 210 m2 and, based on this area, has an overall heat transfer coefficient of 0.037 kW/m2∙°C. Cooling air flows at a rate of 7.59 kg/s. If condensation of the refrigerant occurs at 55°C, what is the outlet temperature (in °C) of the air? Take the specific heat of air to be 1.02 kJ/kg∙°C. Round your answer to 2 decimal places.A computer lab filled with 20 computers and 15 students is cooled by an air conditioningunit on a day where it is 90 oF outside. The room temperature is 72 oF. Assume an averagestudent generate 90 W of heat and each computer generates 150 W of heat. If the COP ofthe air conditioner is 2.5, what power input is required, in kW? If the air conditioneroperated at its maximum coefficient of performance, what power input would be required?Concentrating solar power plants are frequently located in desert areas where they can collect a lot of solar energy. If the power plant produces steam at a temperature of 1,016 oF and is cooled with ambient air at a temperature of 106 oF what is the maximum efficiency of the conversion of solar energy to electricity? Give your answer in percent (%).
- 12.) Water at a rate of 1 lbm/s flows in a vertical heated tube (d = 1.5 in). Systempressure is 1250 psia. Find heat flux at a point where steam quality is 15% andsurface superheat is 12 F. [Ans.: q′′ = 108 kW/m2]air is compressed polytropically in a cylinder according to PV=C. the work required is 180 kj/kg. determine the Heat transferredA car is driven by an engine power 10kW and running at a constant speed 77km/h. How much is the driving force?