Chapter 7, Problem 7.6DOEP

Each of the following statements describes a way of coping with temperature variation. Which scenario most likely includes positive heat transfer through convection? That is, in which scenario does Hconvection most likely have a positive (+) sign? Hanimal = +SR + IRin – IRout +/- Hconvection +/- Hconduction - Hevaporation + Hmetabolic Select one: a. A rabbit basking in the sun early in the morning. b. A lizard resting in the shade in a hot desert in the middle of the day. c. A bumblebee vibrating its flight muscles before flight. d. A ground squirrel hibernating in the winter. e. A bird fluffing its feathers on a cold day.

Your neighbor lives in a 2500-square-foot (about 250 m2) older house heated by natural gas. The current gas heater was installed in the early 1980s and has an efficiency (called the Annual Fuel Utilization Efficiency rating, or AFUE) of 65 percent. It is time to replace the furnace, and the neighbor is trying to decide between a conventional furnace that has an efficiency of 80 percent and costs $1500 and a highefficiency furnace that has an efficiency of 95 percent and costs $2500. Your neighbor offered to pay you $100 if you help him make the right decision. Considering the weather data, typical heating loads, and the price of natural gas in your area, make a recommendation to your neighbor based on a convincing economic analysis.

Feasibility Analysis:1. Identify at least 5 alternative options with regards to solar thermal heating and solar energy and provide reasons with calculations to indicate usage of the alternative solution. 2. Do a Feasibility Analysis according to the following sections. Each section must be thoroughly investigated with calculations to indicate the feasibility where possible. 2.1.Economic Aspects of Renewable energy source evaluation2.2.Basic concepts2.3.Basic Methods for natural resource evaluation2.4.Basic economic Problems2.5.Cost-benefit analysis2.6.Economic impact Analysis