People need considerable time to adjust when moving from one space to another, when temperature and humidity conditions vary widely. This may be described as?
a. Shock effect
b. Change in comfort zone
c. Comfort condition
d. Effective temperature change
e. Air/Motion effect
Answer: A
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Power Engineering Chapter 126
- The comfort of human beings is affected by the atmospheric conditions surrounding them. Which of the following is not an atmospheric condition which affects comfort?
- During sensible heating the dry-bulb temperature and the wet-bulb temperature are raised, and
- Using the psychrometric chart, find the relative humidity if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 25 degrees C.
- Which of the following statements about cooling and dehumidification is false?
- The intersection between the line running vertically from the point on the dry-bulb scale and the downward diagonally running line from the wet-bulb scale is defined as
- Which of the following properties cannot be found on the psychrometric chart?
- Using the psychrometric chart, find the enthalpy if the dry bulb temperature is 20°C and the wet bulb temperature is 15°C.
- An increase in air flow increases heat loss of the body by which of the following methods:
- During the winter, the majority of people feel comfortable when the effective temperature is approximately between:
- During sensible heating, only the _________________ decreases.
- Using the psychrometric chart, find the relative humidity if the dry bulb temperature is 20°C and the wet bulb temperature is 15°C.
- Evaporative cooling results in:
- Using the psychrometric chart, find the enthalpy if the dry bulb temperature is 25°C and the wet bulb temperature is 20°C.
- During the summer, the majority of people feel comfortable when the effective temperature is approximately between:
- Using the psychrometric chart, find the dew point temperature at a dry bulb temperature of 20°C and a wet bulb temperature of 15°C.
- If 5.0 cubic meters per second of air enters a heating coil at 20°C dry bulb and 15°C wet bulb, and leaves the heating coil at 30°C dry bulb, what is the approximate volume of air leaving the coil?
- Air used for ventilating purposes in an office building should be kept within a certain range of relative humidity as indicated below:
- Using the psychrometric chart, find the specific volume if the dry bulb temperature is 20°C and the wet bulb temperature is 15°C.
- Effective temperature is defined as a measure of comfort that involves:
- Using the psychrometric chart, find the enthalpy if the dry bulb temperature is 20°C and the wet bulb temperature is 15°C.
- A measure of comfort that involves the combined effects of the dry bulb temperature, relative humidity and air movement is defined as:
- If 5.0 cubic meters per second of air enters a heating coil at 20°C dry bulb and 15°C wet bulb, and leaves the heating coil at 30°C dry bulb, what is the change in enthalpy?