Chapter 1, Problem 1.62P

Which house uses more energy. Haron's house in June or Areum's house in December? Why do you think so? Haron's House Areum's House YLEENEDGARD ** TALE Seoul, Korea Singapore 3-bedroom 2 bathrooms 4-bedroom, 3 bathrooms Well insulated Poody insulated Built 1997 Bricks and cement only Built 1925, renovated 2005 Bricks with wood siding 3 heaters 3 air-conditioning units As Uncle Areum and Uncle Haron continue to argue, you slip away to another (quieter) room. Pulling out a pad of paper, you begin to think about what factors will have an influence on how much energy is needed to heat or cool each house. AT R- R=AA 9 MMMMMM TITE

The fin efficiency is defined as the ratio of the actual heat transfer from the fin to   a. The heat transfer from an equivalent fin which is infinitely long b. The heat transfer through the base area of the same fin c. The heat transfer from the same fin with an adiabatic tip d. The heat transfer from the same fin if the temperature along the entire length of the fin is the same as the base         temperature

I need a KPI for a project that consists of two partsThe first is glasses that monitor objects around them, and alert the person when an object is within the specified distanceThe second part is a glove that senses the heat from a distance. When the temperature reaches above the permissible limit, the person is alerted by means of a vibration motor.The purposes used in the first part:Spectacle shaped frame3 ultrasonic sensors2 vibration motors  Arduino Pro NanoThe purposes used in the second part:The glove consists of two layers3 temperature sensorsMotor vibrationArduino Pro NanoMicro-nano charging baseWorking principle of each part:part One ::Objects that are within the distance on which the Ultrasonic has been programmed are monitored, where there is to the right of the glasses and the left of the glasses, and to the front of the Ultrasonic glasses, and there is a vibration motor on the right of the glasses and the left of the glasses. A body is monitored from the front, and this…

1. For a steam pipe with a given diameter of 10 cm covered by two (2) layers of insulation. The first insulation has a thickness of 4 cm and a coefficient of thermal conductivity of 0.08 W/m.K. and the second insulation has a thickness of 3 cm and a thermal conductivity of 0.15 W/m.K. The steam main conveys steam at a pressure of 1.70 MPa with 25°C superheat. Outside temperature is 27°C. The pipe is 30 meters in length. (tsat @ 1.70 MPa = 204°C). Determine the following: a) The heat loss in KW b) Explain the concepts/principles that were considered and the factors that affected the condition of the above mentioned items (a & b).

Answer within 10 minutes : The temperature at the inside surface of an oven is 460 oF.  The inside wall of the oven is made of brick and is 8 inch thick.  The thermal conductivity of the brick is 2.2 Btu/hr.ft2.(oF/ft).  The outside of the oven is covered with a 3-inch layer of asbestos as insulation, which has a thermal conductivity of 0.11 Btu/hr.ft2.(oF/ft).  If the outer surface of the insulation has a temperature of 100 oF , calculate the amount of heat lost through 2 ft2 of wall area in 3 hours.

The inside wall of a furnace is at 2100oF and the outside wall is at 300oF. The wall of a furnace must be designed to transmit no more than 220 Btu/hr-ft2. Two types of bricks are available for construction:TYPE A: k = 0.38 Btu/ hr-ft-R with an allowable maximum temperature of 1400oFTYPE B: k = 0.98 Btu/ hr-ft-R with an allowable maximum temperature of 2300oF Both types of bricks have the same dimensions (9” x 4.5” x 3”) but the cost for Type B brick is twice the cost of Type A brick. Illustrate the order of arrangement of bricks A and B in the furnace wall (with thickness, estimated temperatures at the interface between walls A and B and at the interior and exterior surface, the transport area and direction of transfer included)

The inside wall of a furnace is at 2100oF and the outside wall is at 300oF. The wall of a furnace must be designed to transmit no more than 220 Btu/hr-ft2. Two types of bricks are available for construction:TYPE A: k = 0.38 Btu/ hr-ft-R with an allowable maximum temperature of 1400oFTYPE B: k = 0.98 Btu/ hr-ft-R with an allowable maximum temperature of 2300oF Both types of bricks have the same dimensions (9” x 4.5” x 3”) but the cost for Type B brick is twice the cost of Type A brick. What is the rate of heat conduction through wall A? If a 15 ft2 wall is to be constructed, how many bricks will be used? how many brick A and how many brick B?

The inside wall of a furnace is at 2100oF and the outside wall is at 300oF. The wall of a furnace must be designed to transmit no more than 220 Btu/hr-ft2. Two types of bricks are available for construction:TYPE A: k = 0.38 Btu/ hr-ft-R with an allowable maximum temperature of 1400oFTYPE B: k = 0.98 Btu/ hr-ft-R with an allowable maximum temperature of 2300oF Both types of bricks have the same dimensions (9” x 4.5” x 3”) but the cost for Type B brick is twice the cost of Type A brick. Model the wall as one-dimensional and determine the most economical arrangement of the bricks. Include:a drawing labeled with all given informationthe variables used in the appropriate places on the drawing (along with values and units, if provided)a thermal circuit showing the paths for heat transmissionequations and calculationsCalculations that show that the maximum temperature for Type A brick does not exceed 1400oFA recommendation for the number and orientation of the bricks. The inside temp is 2100f…

What is the payback time on a solar hot-water system that cost$ 5,000? Assume the system reduces electrical energy consumption by 4,000 kWhr each year and ilectricity costs 16 cents per kWhr. O 8 years O 4 years O 12 years O 15 years.