Engineering, 20.12.2019 05:31 jbarbie3

A115-volt electrical heater is used to warm 0.3 m3/s of air at 100 kpa and 15°c to 100 kpa and 30°c. how much current in amperes must be supplied to this heater? the gas constant of air is 0.287 kpa·m3/kg·k. the constant pressure specific heat of air at room temperature is cp = 1.005 kj/kg·°c.

Answers: 1

Show answers

Another question on Engineering

Engineering, 04.07.2019 19:10

Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj

Answers: 2

Answer

Engineering, 04.07.2019 19:20

Determine the time of the day and month of the year at which the peak sensible cooling load occurs for a top floor, north-eastern corner room of an office building in durban for the following conditions: floor area: 8 x 8 x 3 m east and north walls: 115 mm face brick (outside), 20 mm air space, 115 mm ordinary brick (inside) with 15 mm plaster roof construction: suspended plasterboard ceiling, 450 mm air space, 150 mm concrete, 75mm screed, waterproofing no heat transfer across other surfaces window area 3x 1,5 m high in north wall only. ordinary glass with venetian blinds. lights and occupants : from 07: 00 to 18: 00 average light density: 25 w/m2 number of occupants : 5 seated, light office work room temperature 24°c

Answers: 3

Answer

Engineering, 06.07.2019 03:20

Not a characteristic property of ceramic material (a) high temperature stability (b) high mechanical strength (c) low elongation (d) low hardness

Answers: 2

Answer

Engineering, 06.07.2019 04:10

Aspherical thermocouple measurement errors a spherical thermocouple made of constantin transfer coefficient between the gas and the thermocouple is h used to measure the temperature of a gas. the heat 400 w/m2 k. calculate the maximum diameter d of the thermocouple if the thermocouple's measurement error should be w 23 within 5% of the initial temperature difference in 5 seconds. for constantin, k 8920 kg/m3, and c 410 j/kg. k.

Answers: 3

Answer

You know the right answer?

A115-volt electrical heater is used to warm 0.3 m3/s of air at 100 kpa and 15°c to 100 kpa and 30°c....

Questions