Recent studies show that the major energy consumption in Fijian villages is wood which is used for cooking on open fires. Typical consumption of wood is 1 kg/person/day. (a) Estimate the heat energy required to boil a 2 litre pot full of water. Assuming this to be the cooking requirement of each person, compare this with the heat content of the wood, and thus estimate the thermal efficiency of the open fire. (b) How much timber has to be felled each year to cook for a village of 200 people ? Assuming systematic replanting, what area of crop must the village therefore set aside for fuel use if it is not to make a net deforestation ?

Recent studies show that the major energy consumption in Fijian villages is wood which is used for cooking on open fires. Typical consumption of wood is 1 kg/person/day. (a) Estimate the heat energy required to boil a 2 litre pot full of water. Assuming this to be the cooking requirement of each person, compare this with the heat content of the wood, and thus estimate the thermal efficiency of the open fire. (b) How much timber has to be felled each year to cook for a village of 200 people ? Assuming systematic replanting, what area of crop must the village therefore set aside for fuel use if it is not to make a net deforestation ?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Related questions

Q: A heat pump is a device that transfer thermal energy from a lower temperature to a higher…

A: Heat pumpIt is a device that extracts heat from a body at a low temperature (source), and delivers…

Q: A small metal building is to be constructed of corrugated steel sheet walls with a total wall…

Q: In Betty Crocker's Cookbook, it is stated that it takes 4 h 15 min to roast a 3.2-kg rib initially…

Q: Estimate the heat exchanger area needed to cool 55,000 lb/hr of a light oil (specific heat = 0.74…

A: “Since you have posted a question with multiple sub parts, we will provide the solution only to the…

Q: Please comment about the solution

A: The ratio of the temperature difference between two faces of a material to the rate of heat flow…

Q: the temperature is low compared to a summer night, an engineering student, studying Heat Transfer…

A: This question is belongs to Thermodynamics, heat transfer.

Q: Consider a heat transfer situation. Heat flows from the hot item or area to the cold item or area.…

A: Here situation is given of two objects hot object and cold object. The heat transfer between two…

Q: An aluminum kettle weighing 2 kg holds 2 litres of water and its heater element consumes a power of…

A: Here we will apply the simple heat formula.

Q: Show an external data to support the claim that the consumers living within regions with hot climate…

A: A cooking pan that is made of stainless steel and has an incorporated digital thermometer in the…

Q: What will happen to the rate of heat transfer? ZAH Difference between inside and outside…

A: Given questions are related to heat transfer. We have to find out if heat transfer will increase,…

Q: Calculate the total heat gain of a restaurant at its peak occupancy load at about 1PM. When hundred…

Q: The thermal conductivity of aluminum is higher than that of concrete material (one of most popular…

A: The thermal conductivity of aluminum is higher than that of concrete material (one of most popular…

Q: effect and thus global climate change. On average, 0.59 kg of CO₂ is produced for each kWh of…

Q: A solar-energy collector produces a maximum temperature of 200 C. The collected energy is used in a…

A: A heat engine is a device that generates heat working between two heat reservoirs, sink, and source.…

Q: Give a detailed solution, Don't copy the existing solution. Will be downvoted if it's chatgpt or…

A: By definition, COP is defined as follows:COP=WorkorPowerRequiredDesiredOutput In our context, the…

Q: Oxy-acetylene torches can be used to cut or weld metal .Oxygen and acetylene are fed from separate…

A: 1. In a closed system, no mass crosses the boundary and hence no matter exchange is possible with…

Q: A power utility company desires to use the hot groundwater from a hot spring to power a heat engine.…

Q: 16. The roof of an electrically heated home is 6 m long, 8 m wide, and 0.25 m thíck, and is made of…

A: a.

Q: A radioactive sphere of 20-cm diameter generates heat at the rate of 300 W. It is cooled by placing…

Question

Recent studies show that the major energy consumption
in Fijian villages is wood which is used
for cooking on open fires. Typical consumption of wood
is 1 kg/person/day. (a) Estimate the heat
energy required to boil a 2 litre pot full of water.
Assuming this to be the cooking requirement of
each
person, compare this with the heat content of the
wood, and thus estimate the thermal
efficiency of the open fire. (b) How much timber has to
be felled each year to cook for a village
of 200 people ? Assuming systematic replanting, what
area of crop must the village therefore
set aside for fuel use if it is not to make a net
deforestation ?

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

The question is in the photo provided, I am currently having diffiiculty with this questions and am getting the wrong answer each time, if you could please help showing the steps, Thanks
Problem 23.1 A dc transformer is supplied with electric power at 230 watts with an input voltage of 220 volts. The transformer output is 1.9 amps at 110 V. The heat transfer surface area for the transformer can be modeled as a 10 cm x 10 cm x 10 cm cube. The convection heat transfer coefficient for the transformer is hconv=6 W/m².K. (a) Determine the input current to the transformer, in amps. (b) Determine the rate of heat transfer from the transformer at steady-state operation conditions, in W. (c) Determine the steady-state surface temperature of the transformer if the ambient air temperature is 25°C. Ans: a) 0.75 amps ≤ |I| ≤ 1.5 amps b) 15 W ≤ ≤ 25 W c) 90°C ≤ |T| ≤ 100°C (for 5 sides w/ heat transfer)
why the coefficient of performance of a heat pump is always greater than 1. Use values such as W, Qin and Qout values to justify your answer.
9) If the temperature of the sun were to suddenly double, by what multiplicative factor would the thermal radiation change ? Show Work
You leave a pastry in the refrigerator on a plate and ask your roommate to take it out before you get home so you can eat it at room temperature, the way you like it. Instead, your roommate plays video games for hours.When you return, you notice that the pastry is still cold, but the game console has become hot. Annoyed, and knowing that the pastry will not be good if it is microwaved, you warm up the pastry by unplugging the console and putting it in a clean trash bag (which acts as a perfect calorimeter) with the pastry on the plate. After a while, you find thatthe equilibrium temperature is a nice, warm 38.3 °C . You know that the game console has a mass of 2.1 kg. Approximate it as having a uniform initial temperature of 45 °C . The pastry has a mass of 0.16 kg and a specific heat of 3.0 k J/(kg · ºC), and is at a uniform initial temperatureof 4.0 °C . The plate is at the same temperature and has a mass of 0.24 kg and a specific heat of 0.90 J/(kg · ºC) . What is the specific heat…
Discuss and Illustrate the 3 modes of heat transfer.
A closed stirred-tank reactor with two compartmentsis shown in Fig. The basic idea is to feed the reactants continuously into the first compartment, where they will be preheated by energy liberated in the exothermic reaction,which is anticipated to occur primarily in the second com-partment. The wall separating the two compartments is quite thin, thus allowing heat transfer; the outside of thereactor is well insulated; and a cooling coil is built intothe second compartment to remove excess energy liberated inthe reaction. Both tanks are completely full at all times.Tests are to be conducted initially with a single-component feed (i.e., no reaction) to evaluate the reactor’s thermalcharacteristics.(a)Develop a dynamic model for this process under the conditions of no reaction. Assume that q0,Ti,andTc all may vary.(b)Make a degrees of freedom analysis for your model—identifying all parameters, outputs, and inputs that must beknown functions of time in order to obtain a solution.(c)In…
solution-correct
A pellet stove used for residential heating produces 8,000 BTUs per hour and is 80% efficient. If over the course of a year, the pellet stove has a 0.37 capacity factor, how many cords of wood were burned over the course of that year? Assume that wood has an energy density of 16MJ/kg and that a cord of wood weight approximately 3,000 lbs. Please show your work.
If the LHV of wood logs is 16 MJ/kg, how much energy is available for 2 kg of wood logs? If I burn all wood logs, what is the maximum energy in the heat I could obtain? If 30% of heat can be changed to electricity, how much electricity will be generated? If the heating value (LHV) of dry wood is 20 MJ/kg, what is the maximum energy 20 tonnes of wood could provide? If 60 % of the heat in wood could be transferred, how much heat can be transferred? If the heating value of coal is 40 MJ/kg, how much energy is available for 10 tonnes of coal? If I burn wood logs (LHV =16 MJ) to obtain the same amount of heat, how much (in tonne) of wood logs do I need to burn?
In an experiment to measure the specific heat of material, a student first measured the masses of the following samples as given in Table 1. Table 1: Measurement of Mass Physical quantity measured in (g) Value Mass of Styrofoam 2.4 cup Mass of Styrofoam 62 cup + water Mass of Brass sample 15.3 Mass of Copper sample 62.5 and then recorded the temperatures of the above two samples, in Table 2. Table 2: Measured values of Temperatures Hot termperature ("C ) Sample Equilibrium cold temperature ( C) temperature ("C) Brass 99.8 26.5 24.5 Сopper 99.8 32 26 Answer the following questions using the data given in Table 1 and Table 2. (Please enter the answers with two digits after decimal) (a) Calculation of specific heat capacity of Brass: Calculated Quantities Mass of the water (in Values grams) Change in temperature lof the hot object ( ATobieca) °C) Change in temperature of water (ATwaer) (°C) Calculated specific heat of the object in (cal/g'C) (b) Calculation of the specific heat capacity…
7