A solar system operates under the following conditions: Solar radiation 1100 W/m2, Specific collector gain qcoll 600 W/m2, specific heat capacity fluid cp 0,011KWh/kg.K, density fluid 1000 kg/m3, total collector surface area 20 m2. The solar system worked in winter day and you need hot water for shower.(The hot water temperature 45 degree C, cold water temperature 15 degree C). The volume of flow of this solar system is

A solar system operates under the following conditions: Solar radiation 1100 W/m2, Specific collector gain qcoll 600 W/m2, specific heat capacity fluid cp 0,011KWh/kg.K, density fluid 1000 kg/m3, total collector surface area 20 m2. The solar system worked in winter day and you need hot water for shower.(The hot water temperature 45 degree C, cold water temperature 15 degree C). The volume of flow of this solar system is

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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8.12 An electric room heater has been designed in the shape of a vertical cylinder 2 m tall and 30 cm in diameter. For safety, the heater surface cannot exceed . If the room air is at , find the power rating of the heater in watts.
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.
A vertical cylinder contains v moles of an ideal gas and is closed off by a piston of mass and area A. The acceleration due to gravity is g. The molar specific heat cy (at constant volume) of the gas is a constant independent of temperature. The heat capacities of the piston und cylinder are negligibly small and any fric- tional forees between the piston and the cylinder walls can be neglected. The whole system is thermaly insulated. Initially, the piston is clamped in position so that the gas has a volume Ve and a tomperature Tn. The pıston is now released and, after some nscillations, comes to rest in a final equilibrium situation corresponding to a larger volumc of the gas. (@) Does the temperature of the gas increase, decrease, or remain the same? (b) Does the entropy of the gas increase, decrease, or remain the same? (c) Calculate the final temperature of the gas in terms of Te, lo, unl the other parameters mentioned in the statement of the prublem.
Q2: A person of skin temp. of 30 K and body surface area 1.75 cm2, find: (a): net total power if he receives radioactive power from the surrounding walls 22 °C would be about 735 w. (6 = 5.7 x 10 12 w/cm) (b): The emissivity of surrounding walls. Good luck
A family enters a winter vacation cabin has been unheated for such a long time the interior temperature is the same as the outside temperature (00C). The cabin consists of a single room of floor area 4m by 4m and height 3m. The room contains one 2kW electric heater. Assuming that the room is perfectly airtight and that all the heat from the electric heater is absorbed by the air, none escaping through the walls or being absorbed by the furnishing, how long after the heater is turned on will the temperature reach the comfort level of 240C.
A truncated cone 30 cm high is constructed of aluminum. The diameter at the top is 7.5 cm, and the diameter at the bottom is 12.5 cm. the lower surface is maintained at 93 o C; the upper surface, at 540 o C. The other surface is insulated. Assuming one dimensional heat flow, what is the rate of heat transfer in watts?
show work please. no previos attempts
The heat transfer through a wall 25’x10’ is 8750 Btu/ hr. The outdoor air and surface temperature = 20 oF and indoor and surface temperature =70 oF. What is the conductance of the wall?
A steady-state electric motor operates under 10 Ampere and 220 Volt operating conditions. The output shaft rotates with 100 rpm (rpm) and 16 Nm torque. The heat transfer from the electric motor to the environment is related to the equation of surface temperature Tb, ambient temperature T0 and hA(Tb-T0). The energy transfer is shown on the figure with the help of arrows. (h=100 W/(m2K)), A= 0.195 m2, T0= 293 K) a) Determine the temperature Tb in K (Kelvin). b) Assuming the electric motor as the system, determine the entropy production in kW/K. c) Assume the area of the system boundary as the ambient temperature (T0) and determine the entropy generation in kW/K for the extended system boundaries.
Heat transfer by conductivity: One side of a 3 cm thick copper plate is held at 400°C and the other at 100°C. How much head transferred through the plate?
Calculate the rate of heat transfer by radiation from an unlagged steam pipe, 50 mm, o.d. at 393 K (120° C) to air at 293 K (20° C). Assume emissivity 'e' of 0.9.
Qi: (50 marks) Find the total heat flux of the composite wall when: B KA = KC = KF = 15 m. K KB = KD = 10 m. K KE = KG = 20 %3D m. K D. Height of B = C = D 4 cm 3 cm 4 cm 6 cm Height of F = G AT = 30 K