consider a classroom for 55 students and one instructor, each generating heat at a rate of 100 W. Lighting is provided by 18 fluorescent light bulbs, 40 W each, and the ballasts consume an additional 10 percent. Determine the rate of internal heat generation in this classroom when it is fully occupied.

Q: Suppose that the incandescent light bulb is used for lighting whose efficiency is 0.034. (a) Also…

A: a..>> Energy supplied = 400000 J. Energy output = 45 Wh=162000 J. So, efficiency of the power…

Q: An electric heater contains 40 litres of water initially at a mean temperature of 15° C. The heater…

A:

Q: 9. Four cubic meters of water is to be heated by means of four 1.5kw, 230V immersion heating…

A:

Q: A student is planning to install a photo-voltaic system in a location where the peak sun hours is 4…

A: given Rated power=200 Welectrical energy =6 KW-hrefficiency=75%

Q: A university campus has 200 classrooms and 400 faculty offices. The classrooms are equipped with 12…

A: Total number of fluorescent tubes equipped in class200×12=2400Total number of tubes in the faculty…

Q: (b) If the temperature of the cold body is -2°C for the refrigerator, and 5°C for the heat pump,…

A:

Q: An engineer creates a model to predict the electric consumption of a household in summer in a day…

A: Given The electric consumption of a House hold when aircon is not used is 23 kwh per day If the…

Q: Supposed your individual energy usage for a week is 85 kWh, the yearly energy usage is equal to…

A: Energy consumption per capita or per individual  is one of the most important criteria which can be…

Q: Read the question carefully and match the answer with its respective question: It has been reported…

A: Given, 10 years before Heat rate h1=8185 Increase in efficiency of power plant in last 10 years is…

Q: How can you optimize the usage of electricity at home wherein, you can still enjoy the convenience…

A: Given  Techniques to optimize the electricity bill. Please find the below attachment for clear…

Q: A 100 Wp solar PV module is installed at a location with irradiation of 4.5 kWh/day. If the impact…

A: Given data, Capacity of solar module C = 100 Wp Irradiation I = 4.5 kWh/day

Q: (c) Calculate and sketch the power absorbed between 0 and 10 ms. (d) Prove that the electronic…

A:

Q: A hotel lobby is required to have an illumination of 117 Lux. 2 Chandeliers shall place in the said…

A:

Q: university campus has 200 classrooms and 400 faculty offices. The classrooms are equipped with 12…

A: We will find out total cost for both cases then we will find saved cost .

Q: Q1 Figure Q1 shows the charge, as an input to the electronic system that operates with the voltage…

A:

Q: 6. A fan that consumes 20 W of electric power when operating is claimed to discharge air from a…

A: Claim Is not reasonable. Explanation is given in step-2

Q: 1. a) Use the values in Table 10.3 to calculate the number of kilowatthoursconsumed in one month by…

A: Given the electrical devices and its power consumption in watts Note book computer ac adapter…

Q: our cubic meters of water is to be heated by means of four 1.5kw, 230V immersion heating elements.…

A: Given data:                 Volume of water =4 m3Power rating of 1 heater, P = 1.5 kWVoltage rating…

Q: Determine the size of PV modules, inverter, batter and solar charge controller of a PV systems given…

A:

Q: A typical electric-powered car having a 2A, 24V battery was charged at constant current from 8am…

A: Since you have asked multiple questions I will answer the first three subparts for you as pwer…

Q: What is the importance of determining the solar constant? Why is there a need to assess the…

A:

Q: compact fluorescent lamp uses less energy than its equivalent incandescent bulb.how much will a…

A: The solution can be achieved as follows.

Q: An electric heater can be modelled as a resistor. In Turkey heaters are designed and sold for 220V…

A:

Q: 4. A tank is initially filled with 300 gallon of salt solution containing 1 kg of salt per gallon. A…

A:

Q: A room air conditioner has a coefficient of performance of 2.9 on a hot day and uses 850 W of…

A: Solution: Given data Coefficient of performance is,  Power consumed,  (a) The work done is, The…

Q: An insulated piston-cylinder device contains 8L of saturated liquid water at a constant pressure of…

A: The final enthalpy of the water after the evaporation is,  h2=h1+x2hfgh1175 kPa=487.01…

Q: A shell and tube heat exchanger, with two tube passes and one shell pass, is used to cool the…

A: According to the question we have to calculate the value of output temperature Tc with the help of…

Q: How can your criteria for selecting solar PV panel with maximum power point system (MPP).

A: Selection criteria for solar PV panel PV module is an assembly of photovoltaic cells that are…

Q: A 600 MW PWR nuclear plant uses 4% enriched uranium fuel has a thermal efficiency of 36%. The burn…

A: Nuclear reactors produce roughly 20% of the electricity consumed in the United States. Uranium is…

Q: The lighting needs of a classroom are met by 30 fluorescent lamps, each consuming 80 W of…

A:

Q: A young solar energy enthusiast is planning to install a photo-voltaic system in a location where…

A: Given data: Average solar irradiance = 5kW-hr/m2 Total area = 5*2m2 = 10 m2 Cell efficiency = 18%…

Q: Q5: Determine the COP of a refrigerator which removes heat from the food at a rate of 6000000 J/h…

A: 5. Determine the COP of a refrigerator which removes heat from the food compartment at a rate of…

Q: A typical 12-V automobile battery, storing about 5 megajoules (MJ) of energy, is connected to a 4-A…

A: (a) The voltage delivered by the automobile battery  E=12 V The current rating of the headlight…

Q: 2. A tank initially contains 1000 gallons of fresh water. Brine containing 3 lbs/gallon of salt…

A: It is given that: intial quantity of fresh water=1000 gallons3 lbs/gallon of salt flows at 2…

Q: Consider a 250 Wp rated monocrystalline PV module. It results from a manufacturing process that…

A: Consider a 250 WP rated mono crystalline PV module. It results from a manufacturing process that…

Q: Assuming that the Philippines is consuming 3.5×10^20 kWh of electrical energy in one year and the…

A: Given data,  Energy consumed = 3.5×1020 kWh Combined efficiency is given as 75%

Q: Estimate the total land (foot-print) that is required for a wind farm for generating an 10 amount of…

A: The total energy to be generated in the wind form is, Total energy=20%…

Q: Four cubic meters of water is to be heated by means of four 1.5 kW, 230-V immersion heating…

A:

Q: 4 at a speed. What rating is of the motor? ER UNIT 6 ELECTRICAL E otor must lift an elevator car…

A:

Q: : Assume a flat-plate horizontal solar collector with an area of 5.5m2 . (a) Estimate the amount of…

A: (a) It is given that area of flat-plate horizontal solar collector = 5.5 m2 Average irradiance per…

Q: Given two loads with the following ratings: CRT TV Set: 190 W LCD TV Set: 96 W Compute the monthly…

A: Given data, Rating of CRT TV set is 190 W. Rating of LCD TV is 86 W. Cost is given 11.25 Rs / kWh

Q: 2.) It is required to lift a 20,000 kg load to a height of 10m using a 25 HP engine. If the…

A: Given values, Weight of load, m = 20,000 kg Height, h= 10 m Power of engine = 25 HP = 18642.5 watt…

Q: Answer the following. A. Which part of the refrigerator should be used for storing raw meat? B. How…

A: A. To avoid the cross contamination, Raw meats should be stored at the bottom of the refrigerator.…

Q: A farm has a monthly consumption of 400 kWh, where all energy consumed is generated through of…

A: Since the farm is needed 400 kWh energy per month and the biogas of 1 m3 is supplied 1.4 kWh energy.…

Q: An elevator is designed to transport 120 passengers per hour from the 1st floor to the 10th floor.…

A:

Q: For an electrical component, the formulas for charge and voltage are given below. A is 9 coulombs,…

A:

Q: A domestic refrigerator rejects 470 W of thermal energy to the air in the room at 15°C. Inside the…

A: Given, A domestic refrigerator rejects thermal energy, Qt=470 W The reject thermal energy inside the…

Electrical Heating Unit

The conversion of electrical energy to heat energy is known as electric heating. The heating system that converts the electrical energy to heat energy for various application is called electrical heating unit. Electricity is employed as the firing mechanism in electric heating systems, which transforms electric current to heat. Electric heaters have heating elements in the form of electric resistors.