A simple solar collector is built by placing a 5-cmdiameter clear plastic tube around a garden hose whose outer diameter is 1.6 cm. The hose is painted black to maximize solar absorption, and some plastic rings are used to keep the spacing between the hose and the clear plastic cover constant. During a clear day, the temperature of the hose is measured to be 65°C, while the ambient air temperature is 26°C. Determine the rate of heat loss from the water in the hose per meter of its length by natural convection. Also, discuss how the performance of this solar collector can be improved. Evaluate air properties at an average temperature of 50° C and 1 atm pressure. Is this a good assumption?
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
A simple solar collector is built by placing a 5-cmdiameter
clear plastic tube around a garden hose whose outer
diameter is 1.6 cm. The hose is painted black to maximize
solar absorption, and some plastic rings are used to keep the
spacing between the hose and the clear plastic cover constant.
During a clear day, the temperature of the hose is measured
to be 65°C, while the ambient air temperature is 26°C.
Determine the rate of heat loss from the water in the hose
per meter of its length by natural
how the performance of this solar collector can be improved.
Evaluate air properties at an average temperature of 50° C and
1 atm pressure. Is this a good assumption?
Trending now
This is a popular solution!
Step by step
Solved in 5 steps with 6 images
