Send help please. Thanks. 1. The heat index (HI) is an estimate of the temperature felt by the human body based on theactual measured air temperature T (in ºF) and relative humidity h,. It is given byHI =– 42.379 +2.049015237 + 10.14333127h, – 0.22475541Th, – (6.83783 × 10-³)T²- (5.481717 x 10-²)h,² + (1.22874 × 10-3)T²h, + (8.5282 - 10-4)Th,²- (1.99 x 10-6)T²h,².a. If the air temperature in your area is 107°F with a relative humidity of 8%, how hot doesyour body feel?b. If the air temperature and relative humidity is known to be increasing at a rate of 2°F persec and 1% per sec, resp., how fast is the heat index changing at the moment when the airtemperature in your area is 107°F with a relative humidity of 8%?

Answered: Image /qna-images/answer/c4092ea0-25ce-4a6f-84a4-d5d3ca0979f7.jpg

1. The heat index (HI) is an estimate of the temperature felt by the human body based on the actual measured air temperature T (in °F) and relative humidity h,. It is given by HI =– 42.379 + 2.049015237 + 10.14333127h, – 0.22475541Th, – (6.83783 × 10-³)T² - (5.481717 x 10-2)h,² + (1.22874 × 10-3)T²h, + (8.5282 - 10-4)Th,² - (1.99 x 10-6)7²h,². a. If the air temperature in your area is 107°F with a relative humidity of 8%, how hot does your body feel? b. If the air temperature and relative humidity is known to be increasing at a rate of 2°F per sec and 1% per sec, resp., how fast is the heat index changing at the moment when the air temperature in your area is 107ºF with a relative humidity of 8%?

1. The heat index (HI) is an estimate of the temperature felt by the human body based on the actual measured air temperature T (in °F) and relative humidity h,. It is given by HI =– 42.379 + 2.049015237 + 10.14333127h, – 0.22475541Th, – (6.83783 × 10-³)T² - (5.481717 x 10-2)h,² + (1.22874 × 10-3)T²h, + (8.5282 - 10-4)Th,² - (1.99 x 10-6)7²h,². a. If the air temperature in your area is 107°F with a relative humidity of 8%, how hot does your body feel? b. If the air temperature and relative humidity is known to be increasing at a rate of 2°F per sec and 1% per sec, resp., how fast is the heat index changing at the moment when the air temperature in your area is 107ºF with a relative humidity of 8%?

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter11: Calibrating Instruments

Section: Chapter Questions

Problem 4RQ: Temperature-measuring instruments may be designed to measure the temperature of vapors, ________,...

See similar textbooks

Similar questions

Calculate (a) the specific volume, (b) the enthalpy, and (c) the absolute humidity of the air at 40 ° C and the relative humidity of 49%, at a barometric pressure of 770 mm Hg. a) specific volume = .... m³ / kg b) enthalpy = ... (kj / kg air) c) absolute humidity = .... (kg water / kg air)
The air in a room is maintained at 20oC with a relative humidity of 40%. For these conditions, estimate the following properties of the air: a) wet-bulb temperature b) dew point temperature c) absolute humidity d) humid volume e) specific enthalpy of air Show your working on the psychrometric chart.
Answer the following: 3. Why do we need to control the temperature and humidity in the aircraft hangar? How does it affect our aircraft mechanics who're working inside the hangar?
Humid air at atmospheric pressure has a dry bulb temperature T_db=15℃ and a wet bulb temperature f=70% Add the point on the attached chart and complete the other properties of this humid air in the table below:
A sample of air is having dry bulb temperature 21°C and relative humidity 30% at barometric pressure of 760 mm of Hg. Find: 1. Partial pressure of vapor 2. Specific humidity 3. Wet bulb temperature and corresponding saturation pressure 4. Percentage humidity or degree of saturation 5. Specific volume of dry air 6. Dew point temperature 7. Enthalpy of moist air per kg of dry air Given: R - 0.287 kJ/kg K; cp dry air) = 1.005 kJ/kg K; specific heat of superheated vapor = 1.884 kJ/kg K and latent heat of vaporization at dew point temperature = 2493 kJ/kg. Do not use psychrometric chart. Psychrometric tables can be used.
1. The barometer shows the value of 740 mm Hg, the temperature of the dry ball is 40 oC, the temperature of the wet ball is 25 0C. specify:a. Relative humidity (RH) =%b. Absolute humidity = (kg water / kg air)c. Dew point temperature = (0C)
1. Plot the four locations in the psychrometric chart and determine the other properties foreach condition using a psychrometric chart (Appendix 8a and 8b). Locations of air Tdb, °C Twb, °C Ambient air 32 28 Conditioned air 25 20 Air at the dryer inlet 30 23 Air at the dryer outlet 33 27 3. What is the relationship between relative humidity and temperature? What about humidityratio and temperature?
Humid air flows in a duct at atmospheric pressure. The temperature and relative humidity are T_db=34℃, T_wb=26℃. Add the point on the attached chart and complete the other properties of this humid air in the table below:
In an air conditioning system, the inside and outside conditions are dry bulb temperature 24°C, relative humidity 50% and dry bulb temperature 35°C, wet bulb temperature 22°C respectively. 50% of the room air is rejected to atmosphere and an equal quantity of fresh air added before air enters the air conditioning apparatus. If the fresh air added is 100 m3/min, determine: a. Room sensible and latent heat load b. Sensible and latent heat load due to fresh air c. Apparatus dew point; d. Humidity ratio and dry bulb temperature of air entering air conditioning apparatus. The room sensible heat factor is 0.8.
Last Oct. 4th, the temperature in Quezon City was 77°F, the barometric pressure was 29.8 in, and the relative humidity was 95%. Estimate the folloa) mole fraction of water in the air (4 decimal places)b) dew point (°C) (4 decimal places)c) molal humidity (4 decimal places)d) absolute humidity (4 decimal places)©) percentage humidity (4 decimal places).
For each situation below, briefly explain how you obtained the values and provide the numerical answer. A) What is the internal energy of saturated water vapor at 305 degree Celsius? B) What is the pressure of a system of saturated liquid water with a specific volume of 0.001488 m^3/kg? C) What is the enthalpy of a saturated mixture of water at 423 k with quality of 43%? D)When 1 kg saturated water vapor is condensed to a saturated liquid water at 325 Kpa, what is the change in its volume? E) What is the specific internal energy of liquid water at 280 degree Celsius and 7500 Kpa?
The results of air temperature measurements obtained a dry bulb temperature of 30.3 ° C and a wet bulb temperature of 31 ° C. Using a psychometric chart, determine the properties of the air as follows: a. Humidity = ...% b. Water content = ... kg water / kg air c. Specific volume = ... m3 / kg d. Enthalpy = ... KJ / Kg e. Condensation temperature = ... ° C If the air is in the space of 162 m3, determine: f. Air weight (dry air and water vapor) = ... kg g. The amount of water content in the space = ... kg