题目内容
Which one of the following methods cannot be used as a cooling method using solar thermal techniques?
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A hotel installation near you wants to cover their water heating demand by solar energy. However, they want to know first if it is possible. The hotel needs 1500 L/day of warm water every day and the water has to be heated from 10 to 60 ºC. The specific heat capacity of water is \(4.18 J/gK\). Assume an irradiance of \(1000 W/m^2\) for 3 equivalent sun hours and an efficiency of 70% for the installation.How much energy does the system need to produce per day to meet the warm water demand? Give your answer in kWh/day.If the hotel has \(30m^2\) available for this application, what is the maximum percentage of the warm water demand that can be covered by solar energy? ______
A hotel installation near you wants to cover their water heating demand by solar energy. However, they want to know first if it is possible. The hotel needs 1500 L/day of warm water every day and the water has to be heated from 10 to 60 ºC. The specific heat capacity of water is \(4.18 J/gK\). Assume an irradiance of \(1000 W/m^2\) for 3 equivalent sun hours and an efficiency of 70% for the installation.How much energy does the system need to produce per day to meet the warm water demand? Give your answer in kWh/day. ______
A solar collector of \(1.5 m^2\) is installed on the rooftop of a house. Assuming that the radiative energy arriving from the sun is \(1000 W/m^2\), the collector reflects 10% of the energy arriving on its surface. Also, the collector is not perfectly insulated, and losses occur. The collector has a a heat transfer coefficient \(h\) of \(2W/m^2K\). The side areas of the collector are assumed to be negligible. The ambient temperature is 20 ºC and the collector is assumed to be at a temperature of 50 ºC. Consider that this temperature is constant thoughout the whole collector. The collector is assumed to behave like a black body.What is the power output of the collector in \(W\)?What percentage of the total losses is caused by radiation? ______
A solar collector of \(1.5 m^2\) is installed on the rooftop of a house. Assuming that the radiative energy arriving from the sun is \(1000 W/m^2\), the collector reflects 10% of the energy arriving on its surface. Also, the collector is not perfectly insulated, and losses occur. The collector has a a heat transfer coefficient \(h\) of \(2W/m^2K\). The side areas of the collector are assumed to be negligible. The ambient temperature is 20 ºC and the collector is assumed to be at a temperature of 50 ºC. Consider that this temperature is constant thoughout the whole collector. The collector is assumed to behave like a black body.What is the power output of the collector in \(W\)? ______
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