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In Gaziantep, many people use the energy of the Sun for heating their domestic water used for having shower in bathroom, for washing-machines, for kitchen stuffs, and etc. An ordinary solar collector panel is generally constructed on the roof of a house and the panels are declined approximately 60° with the horizontal line. Commonly, the total surface area of two glass panels is approximately 4.0 m (2 panels: 1980mm x 1000mm for each) and they receive the energy from the Sun to heat the water. Although there is an inclination by 60°, it is reported that the twenty percent of the total incoming energy is reflected back to the atmosphere by well-insulated panel's glass surface. The remaining energy is used to heat the domestic water from 20°C to 50°C, and it is stored in storage tanks in a sunny day. The cold water enters from the bottom side of panel and exits from the top. It is assumed that the water passing through the solar collector has a negligible pressure drop. If the volume flow rate of water at the exit channel of the glass panel is totally 128.0L/h, then a. Calculate the TEMPERATURE of THE OUTER SURFACE OF THE SUN? b. If the efficiency of glass panels was not constant as "0.8", but was changing between 0.6 and 0.9, then what would be the graph of mass flow rate-versus-efficiency (it means m-vs-n) of the whole system?

In Gaziantep, many people use the energy of the Sun for heating their domestic water used for having shower in bathroom, for washing-machines, for kitchen stuffs, and etc. An ordinary solar collector panel is generally constructed on the roof of a house and the panels are declined approximately 60° with the horizontal line. Commonly, the total surface area of two glass panels is approximately 4.0 m (2 panels: 1980mm x 1000mm for each) and they receive the energy from the Sun to heat the water. Although there is an inclination by 60°, it is reported that the twenty percent of the total incoming energy is reflected back to the atmosphere by well-insulated panel's glass surface. The remaining energy is used to heat the domestic water from 20°C to 50°C, and it is stored in storage tanks in a sunny day. The cold water enters from the bottom side of panel and exits from the top. It is assumed that the water passing through the solar collector has a negligible pressure drop. If the volume flow rate of water at the exit channel of the glass panel is totally 128.0L/h, then a. Calculate the TEMPERATURE of THE OUTER SURFACE OF THE SUN? b. If the efficiency of glass panels was not constant as "0.8", but was changing between 0.6 and 0.9, then what would be the graph of mass flow rate-versus-efficiency (it means m-vs-n) of the whole system?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
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.
Chapter3: Transient Heat Conduction
Section: Chapter Questions
Problem 3.20P
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In Gaziantep, many people use the energy of the Sun for heating their domestic water used for having shower in bathroom, for washing-machines, for kitchen stuffs, and etc. An ordinary solar collector panel is generally constructed on the roof of a house and the panels are declined approximately 60° with the horizontal line. Commonly, the total surface area of two glass panels is approximately 4.0 m² (2 panels: 1980mm x 1000mm for each) and they receive the energy from the Sun to heat the water. Although there is an inclination by 60°, it is reported that the twenty percent of the total incoming energy is reflected back to the atmosphere by well-insulated panel's glass surface. The remaining energy is used to heat the domestic water from 20°C to 50°C, and it is stored in storage tanks in a sunny day. The cold water enters from the bottom side of panel and exits from the top. It is assumed that the water passing through the solar collector has a negligible pressure drop. If the volume flow rate of water at the exit channel of the glass panel is totally 128.0L/h, then a. Calculate the TEMPERATURE of THE OUTER SURFACE OF THE SUN? b. If the efficiency of glass panels was not constant as "0.8", but was changing between 0.6 and 0.9, then what would be the graph of mass flow rate-versus-efficiency (it means ṁ-vs-n) of the whole system?
Transcribed Image Text:In Gaziantep, many people use the energy of the Sun for heating their domestic water used for having shower in bathroom, for washing-machines, for kitchen stuffs, and etc. An ordinary solar collector panel is generally constructed on the roof of a house and the panels are declined approximately 60° with the horizontal line. Commonly, the total surface area of two glass panels is approximately 4.0 m² (2 panels: 1980mm x 1000mm for each) and they receive the energy from the Sun to heat the water. Although there is an inclination by 60°, it is reported that the twenty percent of the total incoming energy is reflected back to the atmosphere by well-insulated panel's glass surface. The remaining energy is used to heat the domestic water from 20°C to 50°C, and it is stored in storage tanks in a sunny day. The cold water enters from the bottom side of panel and exits from the top. It is assumed that the water passing through the solar collector has a negligible pressure drop. If the volume flow rate of water at the exit channel of the glass panel is totally 128.0L/h, then a. Calculate the TEMPERATURE of THE OUTER SURFACE OF THE SUN? b. If the efficiency of glass panels was not constant as "0.8", but was changing between 0.6 and 0.9, then what would be the graph of mass flow rate-versus-efficiency (it means ṁ-vs-n) of the whole system?
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