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irradiance of i sun and a cell temperature of 1 Cell SIc a GaAS solar cell has the following specifications: Voc = 1.2 [V] , Jsc = 24.9 [mA · cm-2], FF = 0.78 [–]. In the case of concentrator PV, the cell is illuminated by many suns. The Vo cell under many suns illumination are given by: Voc = Voc,1 Sun + kg-Tcell · In (X) Ie Isc,1 Sun X Where X is the number of suns received by the cell. You may assume that the FF is independent of the illumination. A) The Voc of the GaAs solar cell is increased to V = 1.3125 [V] under a certain light concentration X. What is the absolute efficiency increase of the solar cell under X sun illumination, with respect to 1 sun illumination? Give a percentage [%] and two decimals.

irradiance of i sun and a cell temperature of 1 Cell SIc a GaAS solar cell has the following specifications: Voc = 1.2 [V] , Jsc = 24.9 [mA · cm-2], FF = 0.78 [–]. In the case of concentrator PV, the cell is illuminated by many suns. The Vo cell under many suns illumination are given by: Voc = Voc,1 Sun + kg-Tcell · In (X) Ie Isc,1 Sun X Where X is the number of suns received by the cell. You may assume that the FF is independent of the illumination. A) The Voc of the GaAs solar cell is increased to V = 1.3125 [V] under a certain light concentration X. What is the absolute efficiency increase of the solar cell under X sun illumination, with respect to 1 sun illumination? Give a percentage [%] and two decimals.

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Please write me a detailed answer in the following exercise. Even if you cannot solve the whole exercise, please provide the answer for any of the two questions. It is URGENT.

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The performance of a GaAs based solar cell is tested under the standard test conditions, which means an 25° C. Under STC a certain GaAs solar irradiance of 1 sun 1000 [W· m-2] and a cell temperature of Tcell cell has the following specifications: Voc = 1.2 [V], Jsc = 24.9 [mA · cm-2], FF = 0.78 [-]. In the case of concentrator PV, the cell is illuminated by many suns. The V cell under many suns illumination are given by: kp -Teall . In (X) Voc = Voc,1 Sun + I = Isc,1 Sun · X Where X is the number of suns received by the cell. You may assume that the FF is independent of the illumination. A) The Voc of the GaAs solar cell is increased to V = 1.3125 [V] under a certain light concentration X. What is the absolute efficiency increase of the solar cell under X sun illumination, with respect to 1 sun illumination? Give a percentage [%] and two decimals. The performance of solar cells decreases however with increasing cell temperature. The temperature coefficients of this particular GaAs based solar cell are ky = -0.00238 [K¯'] and kJ.« 0.000311 [K-1]. sc B) After 1 hour of X sun illumination the temperature of the cell has increased up to Tcell the efficiency of the cell after 1 hour illumination? Give a percentage [%] and two decimals. (Hint: the V is also temperature dependent.) 80° C. What is
Transcribed Image Text:The performance of a GaAs based solar cell is tested under the standard test conditions, which means an 25° C. Under STC a certain GaAs solar irradiance of 1 sun 1000 [W· m-2] and a cell temperature of Tcell cell has the following specifications: Voc = 1.2 [V], Jsc = 24.9 [mA · cm-2], FF = 0.78 [-]. In the case of concentrator PV, the cell is illuminated by many suns. The V cell under many suns illumination are given by: kp -Teall . In (X) Voc = Voc,1 Sun + I = Isc,1 Sun · X Where X is the number of suns received by the cell. You may assume that the FF is independent of the illumination. A) The Voc of the GaAs solar cell is increased to V = 1.3125 [V] under a certain light concentration X. What is the absolute efficiency increase of the solar cell under X sun illumination, with respect to 1 sun illumination? Give a percentage [%] and two decimals. The performance of solar cells decreases however with increasing cell temperature. The temperature coefficients of this particular GaAs based solar cell are ky = -0.00238 [K¯'] and kJ.« 0.000311 [K-1]. sc B) After 1 hour of X sun illumination the temperature of the cell has increased up to Tcell the efficiency of the cell after 1 hour illumination? Give a percentage [%] and two decimals. (Hint: the V is also temperature dependent.) 80° C. What is
A hotel wants to cover their water heating demand by solar energy. The hotel needs 1500 L· day of warm water every day and the water has to be heated from 10° C to 60°C. The specific heat capacity of water is 4.18 J.g an efficiency of n = 70 |%| for the installation. -1 ·K-1. Assume an irradiance of 1000 [W. m2] for 3 equivalent sun hours (ESH) and A) How much energy should be produced per day to meet the warm water demand? Give your answer in [kWh day]. B) If the hotel has 30 m2] available for this application, what is the maximum percentage of the warm water demand that can be covered by solar energy?
Transcribed Image Text:A hotel wants to cover their water heating demand by solar energy. The hotel needs 1500 L· day of warm water every day and the water has to be heated from 10° C to 60°C. The specific heat capacity of water is 4.18 J.g an efficiency of n = 70 |%| for the installation. -1 ·K-1. Assume an irradiance of 1000 [W. m2] for 3 equivalent sun hours (ESH) and A) How much energy should be produced per day to meet the warm water demand? Give your answer in [kWh day]. B) If the hotel has 30 m2] available for this application, what is the maximum percentage of the warm water demand that can be covered by solar energy?
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