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roints: hing: (LO2, 10 Marks) A solar water heating... (LO2, 10 Marks) A solar water heating...
A solar panel (5m x 2m) is used for heating domestic water. The absorbing panel has...
A solar panel (5m x 2m) is used for heating domestic water. The absorbing panel has an absorbtivity of 0.93, a top-plate symmetry emissivity of 0.9, and a back-plate emissivity of 0.05. The transmittance through the glass top cover is 0.85. With a peak radiation of 700 W/m^2 the absorber temperature is 100° C and the top-cover is 60° C. if the all the absorber heat is transferred to the water which flows through ducts in the absorber with negligible...
A pump is pumping water at a flow rate of 1200 litres per minute. In the...
A pump is pumping water at a flow rate of 1200 litres per minute. In the pump the mechanical energy of the water increases by 250 J/kg. The density of water is 1000 kg/m3. a) Determine the pressure difference between the pump outlet and the pump inlet. Assumptions: there are no frictional losses in the pump, and differences in velocity and elevation between inlet and outlet of the pump can be neglected. b) Show that the mechanical power added to...
3) A solar powered steam generator operates under an ideal Rankine cycle. Water at a pressure...
3) A solar powered steam generator operates under an ideal Rankine cycle. Water at a pressure of 15MPa enters the turbine as saturated vapor and leaves with a pressure of 0.125MPa. The mass flow rate in the cycle is 100 kg/s, while the temperature difference in the condenser water is 24 Celsius. Draw the T-s diagram of this ideal Rankine cycle. Determine the following: A) The net power developed in the cycle in kW B) The rate of heat transfer...
Question 2 [Total Marks 25 High Temperature Solar Thermal Systems a) Describe the principle of operation of a central r...
Question 2 [Total Marks 25 High Temperature Solar Thermal Systems a) Describe the principle of operation of a central receiver concentrating solar thermal system Include a discussion of the method of collecting sunlight, working fluid, generating electricity and storage. Include appropriate diagram(s) in your description 10 Marks Describe the key differences between solar trough and parabolic dish solar thermal b) collectors. Why is the receiver for a parabolic dish located a long way above the rim of the collector, while...
A simple Rankine cycle uses water as the working fluid. The boiler operates at 6000 kPa...
A simple Rankine cycle uses water as the working fluid. The boiler operates at 6000 kPa and the condenser at 40 kPa. At the entrance to the turbine, the temperature is 380 °C. The isentropic efficiency of the turbine is 88 %, pressure and pump losses are negligible, and the water leaving the condenser is subcooled by 5.9 °C. The boiler is sized for a mass flow rate of 17 kg/s. Determine the following values. °C m®/kg 1 kJ/kg (1)...
In a solar water heater, energy from the Sun is gathered by water that circulates through...
In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a holding tank. Assume that the efficiency of the overall system is 29.0% (that is, 71% of the incident solar energy is lost from the system). What collector area is necessary to raise the temperature of 430...
In a solar water heater, energy from the Sun is gathered by water that circulates through...
In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a holding tank. Assume that the efficiency of the overall system is 28.0% (that is, 72% of the incident solar energy is lost from the system). What collector area is necessary to raise the temperature of 240...
In a solar water heater, energy from the Sun is gathered by water that circulates through...
In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a holding tank. Assume that the efficiency of the overall system is 29.0% (that is, 71% of the incident solar energy is lost from the system). What collector area is necessary to raise the temperature of 350...
Fifty units in parallel of full tracking parabolic trough solar concentrator (PTC), is 1 m wide...
Fifty units in parallel of full tracking parabolic trough solar concentrator (PTC), is 1 m wide and 4 m long. A receiver suspended above the trough, consisting of a simple copper tube of 3.75 cm diameter coated with Ebanol-C (a = 0.9), which is covered with transparent Sunadex white crystal tube of 6 cm diameter (t = 0.915). The reflector is back silvered glass (p=0.9), If the PTC is operating with inlet and outlet temperatures of 70°C and 95°C respectively...
Could someone help me with this question please as I am kinda lost as in how to do these type of questions please explain each step a) Draw a diagram of a solar hot water system and discuss the funct...
Could someone help me with this question please as I am kinda
lost as in how to do these type of questions
please explain each step
a) Draw a diagram of a solar hot water system and discuss the functions of its [5 marks For the solar collector, analyse the solar radiation heat gain and heat losses through different modes of heat transfer. How is the heat transfer rate to the water per unit area of the collector calculated? b)...
Question 2 [Total Marks 25 High Temperature Solar Thermal Systems a) Describe the principle of operation of a central receiver concentrating solar thermal system Include a discussion of the method of collecting sunlight, working fluid, generating electricity and storage. Include appropriate diagram(s) in your description 10 Marks Describe the key differences between solar trough and parabolic dish solar thermal b) collectors. Why is the receiver for a parabolic dish located a long way above the rim of the collector, while...
A simple Rankine cycle uses water as the working fluid. The boiler operates at 6000 kPa and the condenser at 40 kPa. At the entrance to the turbine, the temperature is 380 °C. The isentropic efficiency of the turbine is 88 %, pressure and pump losses are negligible, and the water leaving the condenser is subcooled by 5.9 °C. The boiler is sized for a mass flow rate of 17 kg/s. Determine the following values. °C m®/kg 1 kJ/kg (1)...
Fifty units in parallel of full tracking parabolic trough solar concentrator (PTC), is 1 m wide and 4 m long. A receiver suspended above the trough, consisting of a simple copper tube of 3.75 cm diameter coated with Ebanol-C (a = 0.9), which is covered with transparent Sunadex white crystal tube of 6 cm diameter (t = 0.915). The reflector is back silvered glass (p=0.9), If the PTC is operating with inlet and outlet temperatures of 70°C and 95°C respectively...
Could someone help me with this question please as I am kinda
lost as in how to do these type of questions
please explain each step
a) Draw a diagram of a solar hot water system and discuss the functions of its [5 marks For the solar collector, analyse the solar radiation heat gain and heat losses through different modes of heat transfer. How is the heat transfer rate to the water per unit area of the collector calculated? b)...
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