For Questions 5 to 7 The winter air conditioning system has a preheat coil, an air washer, and a reheat coil as processing units. It supplies air at 38°C db-temperature to a space maintained at 21°C db- temperature and 13°C wb-temperature. The sensible and latent heat loads on the space are 50 kW and 25 kW, respectively. Of the return air from the space, 40% by dry air mass is discharged to the ambient and replaced with fresh outdoor air at 2°C db-temperature and 95% relative humidity. In the preheater, the air is heated to a db-temperature of 21°C. Assume that the water added in the air washer is at the wb-temperature of the air entering it. The pressure is constant at 95 kPa. Determine: Question 5 The mass flow rate of supply air in kg/s. Round your answer to 3 decimal places. Add your answer Question 6 The rate of heat input in the preheat coil in kW. Round your answer to 2 decimal places. Question 7 The mass flow rate of water sprayed in the air washer in kg/s. Hint: moisture level is constant through the preheater and the reheater, as well as through the fan. Round your answer to 4 decimal places. Add your answer

For Questions 5 to 7 The winter air conditioning system has a preheat coil, an air washer, and a reheat coil as processing units. It supplies air at 38°C db-temperature to a space maintained at 21°C db- temperature and 13°C wb-temperature. The sensible and latent heat loads on the space are 50 kW and 25 kW, respectively. Of the return air from the space, 40% by dry air mass is discharged to the ambient and replaced with fresh outdoor air at 2°C db-temperature and 95% relative humidity. In the preheater, the air is heated to a db-temperature of 21°C. Assume that the water added in the air washer is at the wb-temperature of the air entering it. The pressure is constant at 95 kPa. Determine: Question 5 The mass flow rate of supply air in kg/s. Round your answer to 3 decimal places. Add your answer Question 6 The rate of heat input in the preheat coil in kW. Round your answer to 2 decimal places. Question 7 The mass flow rate of water sprayed in the air washer in kg/s. Hint: moisture level is constant through the preheater and the reheater, as well as through the fan. Round your answer to 4 decimal places. Add your answer

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.2DP

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The winter air conditioning system has a preheat coil, an air washer, and a reheat coil as processing units. It supplies air at 38°C db-temperature to a space maintained at 21°C db-temperature and 13°C wb-temperature. The sensible and latent heat loads on the space are 50 kW and 25 kW, respectively. Of the return air from the space, 40% by dry air mass is discharged to the ambient and replaced with fresh outdoor air at 2°C db-temperature and 95% relative humidity. In the preheater, the air is heated to a db-temperature of 21°C. Assume that the water added in the air washer is at the wb-temperature of the air entering it. The pressure is constant at 95 kPa. Determine:The mass flow rate of supply air in kg/s.The rate of heat input in the preheat coil in kW.The mass flow rate of water sprayed in the air washer in kg/s.
A vapor compression refrigeration system is designed to have a capacity of 150 tons of refrigeration. It produces chilled water from 22°C to 2°C. Its actual coefficient of performance is 5.86 and 35% of the power supplied to the compressor is lost in the form of friction and cylinder cooling losses. Determine the condenser cooling water required for a temperature rise of 10°C.
Subject : Thermofluid A well-sealed house left alone during the midday heat was found to be at 35oC. He turns on the air conditioner, which cools the entire house to 24oC in 30 min. If the COP of the air-conditioning system is 2.6, determine the power drawn by the air conditioner. An estimated of 750 kg of air is within the house for which cv = 0.72 kJ/kg·oC and cp = 1.0 kJ/kg·oC.