Consider calculating the amount of natural gas required to heat water in a heater. A family in Oklahoma uses 84 gallons of hot wat of 60°F to 135°F. Assume the efficiency of the heater is 82%. (The density of water is 1,000 kg/m³. Note that 1 cubic meter is 264 rounded intermediate values in your calculations-including answers submitted in WebAssign.) What is the mass of hot water consumed by the family per day (in kg/day)?

Consider calculating the amount of natural gas required to heat water in a heater. A family in Oklahoma uses 84 gallons of hot wat of 60°F to 135°F. Assume the efficiency of the heater is 82%. (The density of water is 1,000 kg/m³. Note that 1 cubic meter is 264 rounded intermediate values in your calculations-including answers submitted in WebAssign.) What is the mass of hot water consumed by the family per day (in kg/day)?

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.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.67P: 1.67 In beauty salons and in homes, a ubiquitous device is the hairdryer. The front end of a typical...

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1.67 In beauty salons and in homes, a ubiquitous device is the hairdryer. The front end of a typical hairdryer is idealized as a thin-walled cylindrical duct with a 6-cm diameter with a fan at the inlet that blows air over an electric heating coil as schematically shown in the figure. The design of this appliance requires two power settings, with which the air blown over the electric heating coil is heated from the ambient temperature of to an outlet temperature of and with exit air velocities of 1.0 m/s and 1.5 m/s. Estimate the electric power required for the heating coil to meet these conditions, assuming that heat loss from the outside of the dryer duct is neglected.
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