One type of PV module consists of 72 cells and the size of each cell is 0.125 m x 0.125 m. The electricity conversion efficiency of the module under standard test conditions is 14%. Estimate the power output of one module and the number of modules required to generate 3 kW power at 962 W/m2 insolation and 60°C cell temperature, assuming that the temperature coefficient of the module power is 0.5%/°C.
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- A 1 mol of an ideal diatomic gas is contained in a system. What is the temperature change when an additional heat of 72.5 heat is supplied and 235 J of work is applied?Final Answer must be a decimal or whole numbers only!!!@ 2 O: F2 W S 8. An electric immersion heater has a power rating of 1900 W. If the heater is placed in a 1.8 kg of water at 30 °C, how many minutes will it take to bring the water to a boiling temperature? (Assume that there is no heat loss except to the water itself. Cwater=4186 J/kg.°C) min # 3 X 80 F3 E D $ 4 C F4 R TI F or do % 5 V F5 T G > 6 MacBook Air B F6 < H 887 & ◄◄ F7 U N * 8 J DII F8 M ( 9 K F9 O ) C L F10 (4) P F11 31 + 11 F12 18 BEL ?
- The rate at which a resting person converts food energy is called one’s basal metabolic rate (BMR). Assume that the resulting internal energy leaves a person’s body by radiation and convection of dry air. When you jog, most of the food energy you burn above your BMR becomes internalenergy that would raise your body temperature if it were not eliminated. Assume that evaporation of perspiration is the mechanism for eliminating this energy. Suppose a person is jogging for “maximum fat burning,” converting food energy at the rate 400 kcal/h above his BMR, and putting out energy by work at the rate 60.0 W. Assume that the heat of evaporation of water at body temperature is equal to its heat of vaporization at 100°C. (a) Determine the hourly rate at which water must evaporate from his skin. (b) When you metabolize fat, the hydrogen atoms in the fat molecule are transferred to oxygen to form water. Assume that metabolism of 1.00 g of fat generates 9.00 kcal of energy and produces 1.00 g of…314.0 kg copper bar is put into a smelter for melting. The initial temperature of the copper is 299.0 K. How much heat in kilojoules must the smelter produce to completely melt the copper bar? (The specific heat for copper is 386 J/kg•K, the heat of fusion for copper is 205 kJ/kg, and its melting point is 1357 K.)Suppose a walrus transfers energy by conduction through its blubber at the rate of 125 W when immersed in -1.25°C water. The walrus’s internal core temperature is 37.0°C, and it has a surface area of 1.85 m2. Chart attached. What is the average thickness of its blubber, in centimeters, which has the conductivity of fatty tissue?
- A copper wire has a cross section of 2.5 mm^2 and a length of 2 meters. What is the electrical resistant at 20 degrees Celsius?You have a spherical heater, outside diameter = 3.40 cm, immersed in a container of water. In order to keep the water in the container heated to a constant temperature of 35.0°C you adjust the temperature of the spherical heater. You reach a steady-state condition when the surface temperature of the spherical heater is at 79.0°C. Assuming the electrical efficiency of the heater is 100.0%, calculate the power required by the heater (i.e., calculate q). Ignore radiation.A 42 client with a body mass of 74 kg is interested in jogging on the treadmill as their primary means of exercise, while they listen to their "pump-up" music playlist that lasts exactly 28 minutes. To be sure they get the recommended volume of exercise each week, you'd like to have your client burn 350 kcal in each jogging session. To achieve this, what should your client set as the treadmill speed while running, in miles per hour?
- The first law of thermodynamics relates the heat transfer into or out of a system to the change of internal and the work done on the system. How much heat, in joules, is transferred into a system when its internal energy decreases by 165 J while it was performing 27.5 J of work?a) The power of the immersion heater is 120 Watts. In 10 minutes, the reading falls from 482g to 474g. What is the specific latent heat of water? b) 5.7MJ of heat energy is supplied to 30kg of aluminium that is initially at a temperature of 20°C .If the specific heat capacity of aluminium is 950J/kg °C, determine its final temperature ?A large heat exchanger transfers a total of 100 MW. Assume the wall separating steam and seawater is 4 mm of steel, conductivity 15 W/m K and that a maximum of 5°C difference between the two fluids is allowed. Find the required minimum area for the heat transfer.