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An electric refrigerator rated 400 W operates 8 hour/day. What is the cost of the energy to operate it for 30 days at Rs 3.00 per kW h?
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- Solar energy stored in large bodies of water, called solar ponds, is being used to generate electricity. If such a solar power plant has an efficiency of 3 percent and a net power output of 180 kW, determine the average value of the required solar energy collection rate, in Btu/h.Consider a building whose annual air-conditioning load is estimated to be 120,000 kWh in an area where the unit cost of electricity is RM0.10/kWh, as shown in Figure 4 below. Two air conditioners are considered for the building. Air conditioner A has a seasonal average Coefficient of Performance, COP of 3.2 and costs RM5,500 to purchase and install. Air conditioner B has a seasonal average COP of 5.0 and costs RM7,000 to purchase and install. All else being equal; analyse both possibilities and determine which air conditioner is a better buy. 120,000 kWh A B Air cond. Air cond. COP = 3.2 House COP = 5.0 120,000 kWh Figure 4Electric energy is to be stored at a station in which 5000 condensers are connected in parallel. The capacity of each condenser is 200 μF. The system is to be charged to a P.D. of 50 kilovolt with a power supply which costs at a rate of Rs 1 per kilowatt hour. Calculate the cost of storing.