Answer:
1) Best design is the use of thermal insulation and high efficiency furnace
2) The application of heat transfer knowledge is expressed in the reduction of fuel from year to year. and these decreases in fuel, leads to a decrease in the emissions of greenhouse gases
3) Methane should be considered a greenhouse gas, methane is part of the gases emitted when fuel is burnt hence using a thermally insulated house with a high efficient furnace to reduce the amount of fuel burnt is beneficial in the reduction of the emission of greenhouse gases like methane
Explanation:
Given Data :
Number of days = 150 days ( 1st Nov to 31st March )
Total working time = 150 * 60 *24 = 216000 mins
Heat loss without insulation = 864 Btu/min ( 4000 * 216000 )
heat loss with insulation = ( 1- 0.8 ) * 864 = 172.8 MBTU
1) Best design to use
i) Without insulation, Low efficiency furnace
fuel required = 864 / 0.9 = 960 MBTU
cost of fuel at current price = 3 * 960 = $2880
cost of fuel at old price = $11520
ii) with insulation, low efficiency furnace
fuel required = 172.8 / 0.9 = 192 MBTU,
cost of fuel at current price = $576
cost of fuel at old price = $ 2304
After repeating the same process for every combination it is discovered that the design with the least cost is the use of thermal insulation with a high efficiency furnace Hence it is the best design to implement
2) The application of heat transfer knowledge is expressed in the reduction of fuel from 960MBTU per year to 173.67 MBTU per year. and the decrease in fuel leads to a decrease in the emissions of greenhouse gases
3) Methane should be considered a greenhouse gas, methane is part of the gases emitted when fuel is burnt hence using a thermally insulated house with a high efficient furnace to reduce the amount of fuel burnt is beneficial in the reduction of the emission of greenhouse gases like methane
