Warm water is needed by humanbeing to take a bath, ........

Warm water is needed by humanbeing to take a bath, wash their clothes, their dishes etc. By the photothermal conversion, the solar energy can be used to heat the water. Flat solar collector is a tool which is used to capture energy of sun radiation then convert it into heat to heat up water in collector?s pipe. The number of glass cover used effects the performance and efficiency of the collector. From this research, it is found that the efficiency of the collector is better when the cover used are two glasses than one glass. The temperature difference of incoming and outgoing water in the collector using 2 glasses 17oC higher than that of 1 glass. Abstract in Bahasa Indonesia : Air panas dibutuhkan manusia untuk berbagai keperluan seperti untuk mandi, mencuci baju, piring dan lain sebagainya. Dengan konversi fotothermal, maka energi panas matahari dapat dimanfaatkan untuk memanaskan air. Sebuah kolektor surya plat datar digunakan untuk memerangkap energi panas matahari dan panasnya diteruskan ke pipa-pipa yang berisi air sehingga terjadi peningkatan suhu dari air yang berada di dalam pipa tersebut. Jumlah kaca penutup dari kolektor memepengaruhi unjuk kerja dari kolektor. Secara umum diperoleh hasil bahwa dengan menggunakan dua buah kaca penutup diperoleh efisiensi yang lebih baik dibandingkan hanya menggunakan satu kaca. Perbedaan suhu antara air keluar kolektor dan yang masuk ke kolektor dengan 2 kaca penutup bisa lebih tinggi hingga sekitar 17°C dibandingkan kolektor dengan sebuah kaca penutup. Kata kunci : energi tak habis terpakai, kolektor panas matahari, konversi photothermal, pemanas air

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