Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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Chapter 8, Problem 11P
To determine
Find the heating degree days per year and check the result with Table 8.4
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What is the airport reference temperature, if the monthly mean of average daily temperature for
the hottest month of a study year = 24°C and the monthly mean of the maximum daily
temperature for the same month of the same year = 30°C
At a certain station, the mean of the average
temperature is 25°C and mean of the
maximum daily temperature is 46°C . What
is the airport reference temperature ?
At a climate station, air pressure is measured as 100
kPa, air temperature as 24°C, and the wet-bulb or
dew point temperature as 19°C. Calculate the
corresponding relative humidity in percent.
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- A typical exterior masonry wall of a house, as shown in the accompanying, consists of the items in the accompanying table. Assume an inside room temperature of 20º C and an outside air temperature of −12º C, with an exposed area of 15 m2 . Calculate the heat loss through the wall.arrow_forwardWhat is passive cooling of buildings? explain various passive cooling technologies with the help diagrams. Which technologies are suitable for UAE climate? Hint: UAE climate is very hot sometimes 45 degrees and 30% humidity.arrow_forwardA thermometer reading 18°F is brought into a room where the temperature is 70°F. One minute later the thermometer reading is 31°F. Determine the: a) temperature reading as a function of time b) temperature reading 5 minutes after the thermometer is first brought into the room.arrow_forward
- 2. A cup of tea is prepared in a preheated cup with hot water so that the temperature of both the cup and the brewing tea is initially 200° F. The cup is then left to cool in a room kept at a constant 60° F. Three minutes later, the temperature of the tea is 140° F. Determine (a) the temperature of the tea after 6 minutes and (b) the time required for the tea to reach 80° F.arrow_forwardDuring winter, when people are in a well-insulated house,they usually feel comfortable if the air temperature is near22°C (72°F). If you have ever spent a night in a poorly insulatedcabin in winter, however, you will recognize that paradoxically,when people are in poorly insulated buildings, they often feelchilly even when the air inside is heated to 22°C or higher. Oneimportant reason for the difference in how warm people feel inthe two sorts of buildings is that even if a well-insulated andpoorly insulated building are identical in the air temperatureinside, they differ in thermal-radiation heat transfer. Specifically,a person standing in the two types of buildings experiencesdifferent heat exchange by thermal radiation in the two. Explainhow thermal-radiation heat transfer accounts for the sense ofchill in the poorly insulated building. (Hint: Think of the outerwalls of the two types of buildings, and think specifically of thetemperatures of the interior surfaces of those walls.)arrow_forwardA typical ceiling of a house consists of items shown in the accompanying table. Assume an inside room temperature of 70F and an attic air temperature of 15F, with an exposed area of 1000 ft2. Calculate the heat loss through the ceiling.arrow_forward
- During the midday 2pm, the temperature of the water that is left out on a table is 18° If the temperature of the surrounding is 34°C and the water’s temperature heated up to 26°C at 2:25pm. After how many minutes will the water’s temperature be 32°C?arrow_forwardFor the hottest month of the year at the proposed airport site, the monthly mean of the average daily temperature is 39°C. The monthly of the maximum daily temperature is 48°C for the same month of the year. From the given information, the calculated Airport Reference Temperature (in °C), isarrow_forwardProblem 8-10) Consider 2 kg of air has a decrease of internal energy of 25 kJ during a reversible non flow isobaric process. What is the change in temperature in Kelvin? Correct Answer: -17.4 to -17.2 inclusivearrow_forward
- Convert: Convert a (15.5 °C+ 17) temperature into °F temperature.arrow_forwardExample 1.6: If the monthly mean of average daily temperature and monthly mean of maximum daily temperature of the hottest month of the year are 38°C and 47°C, respectively, then airport reference temperature is: (a) 38 °C (b) 41 °C (c) 47 °C (d) 50 °C Ch=arrow_forwardIf the atmosphere in the afternoon during a humid period is at 90°F and 80% relativehumidity (barometer reads 738 mmHg) while at night (fully saturated) it is at 68°F(barometer reads 745 mmHg), what percent of the water in the afternoon air is depositedas dew. (Assume 100lb of afternoon air) 4 decimal placesarrow_forward
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