scholarly journals Experimental studies in high temperature aqueous chemistry at Oak Ridge National Laboratory

1997 ◽  
Vol 69 (5) ◽  
pp. 905-914 ◽  
Author(s):  
R. E. Mesmer ◽  
D. A. Palmer ◽  
J. M. Simonson ◽  
H. F. Holmes ◽  
P. C. Ho ◽  
...  
Keyword(s):  
High Temperature ◽  
National Laboratory ◽  
Experimental Studies ◽  
Aqueous Chemistry ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory

scholarly journals Investigation of the proposed solar-driven moisture phenomenon in asphalt shingle roofs

2016 ◽  
Vol 40 (4) ◽  
pp. 311-323
Author(s):  
Philip Boudreaux ◽  
Simon Pallin ◽  
Roderick Jackson
Keyword(s):  
Energy Efficient ◽  
National Laboratory ◽  
Experimental Studies ◽  
Absolute Humidity ◽  
Thermal Control ◽  
Oak Ridge ◽  
Significant Difference ◽  
Oak Ridge National Laboratory ◽  
Before And After ◽  
Roof Sheathing

Unvented attics are an energy-efficiency measure to reduce the thermal load of the conditioned space and decrease the space conditioning energy consumption by about 10%. This retrofit is usually done by spraying polyurethane foam underneath the roof sheathing, and on the gables and soffits of an attic to provide an air barrier and a thermal control layer. Unvented attics perform well from this perspective, but from a moisture perspective sometimes homes with unvented attics have high interior humidity or moisture damage to the roof. As homes become more air tight and energy efficient, a better understanding of the hygrothermal dynamics of homes with energy-efficient envelopes becomes more important. One proposed reason for high unvented attic humidity has been that moisture can come through the asphalt shingle roof system and increase the moisture content of the roof sheathing and attic air. This has been called “solar-driven moisture.” Oak Ridge National Laboratory investigated this proposed phenomenon by examining the physical properties of a roof and the physics required for the phenomenon. Results showed that there are not favorable conditions for solar-driven moisture to occur. Oak Ridge National Laboratory also conducted an experimental study in a home with an unvented attic and compared the humidity below the roof sheathing before and after a vapor impermeable underlayment was installed. There was no statistically significant difference in absolute humidity before and after the impermeable underlayment was installed. The outcomes of the theoretical and experimental studies suggest that solar-driven moisture does not occur in any significant amount.

scholarly journals EVALUASI DAN PERKEMBANGAN PEMBUATAN BAHAN BAKAR KERNEL UO2 DI PTAPB-BATAN YOGYAKARTA

2007 ◽  
Vol 10 (1) ◽  
Author(s):  
Hidayati Hidayati ◽  
Sri Rinanti Susilowati ◽  
Didiek Herhady
Keyword(s):  
High Temperature ◽  
National Laboratory ◽  
Sol Gel ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory ◽  
High Temperature Reactor

EVALUASI DAN PERKEMBANGAN PEMBUATAN BAHAN BAKAR KERNEL UO2 DI PTAPBBATANYOGYAKARTA Telah dilakukan evaluasi pembuatan bahan bakar kernel UO2 sertaperkembangannya di Bidang Kimia dan Teknologi Proses Bahan (BKTPB) – PTAPB - BATAN Yogyakarta.Pembuatan kernel UO2 telah dilakukan dengan metode gelasi internal maupun eksternal. Metode gelasiinternal dilakukan dengan cara kombinasi proses KEMA-HKFA (Keuringvan Electrotecnische Materialenat Arnhem-Hkernforchungsanlage) maupun dengan proses ORNL (Oak Ridge National Laboratory),sedangkan metode gelasi eksternal dilakukan dengan proses emulsifikasi NUKEM (Nuclear Chemie undMetalurgie Gmbh). Dengan metode gelasi internal, telah dilakukan berbagai optimasi kondisi prosesnya.Hasil sementara menunjukkan bahwa proses yang paling baik adalah proses ORNL menggunakan mediagelasi TCE (tricloro etilena). Dengan metode gelasi eksternal, telah diperoleh beberapa kondisi optimum,namun masih perlu dilakukan optimasi lebih lanjut. Untuk memilih metode gelasi internal atau eksternaltergantung pada kemudahan proses, murah secara ekonomi serta yang memberikan hasil terbaik.Pemilihan metode belum bisa diputuskan karena belum semua variabel proses dioptimasi. Penelitianmengenai pelapisan kernel UO2 menggunakan silikon karbida (SiC) maupun pirokarbon (PyC) barumerupakan tahap awal, sehingga masih diperlukan optimasi berbagai variabel prosesnya. Penelitianpembuatan kernel UO2 di BKTPB – BATAN Yogyakarta direncanakan untuk pembuatan inti elemen bakarbentuk bola untuk HTR (High Temperature Reactor) dan dikembangkan sebagai bahan awal prosespembuatan pelet (proses SGMP = Sol-Gel Microsphere Pelletization) untuk PHWR (Pressurized HeavyWater Reactor).

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