This document, the THERM 5 / WINDOW 5 NFRC Simulation Manual, discusses how to use the THERM and WINDOW programs to model products for NFRC certified simulations and assumes that the user is already familiar with those programs. In order to learn how to use these programs, it is necessary to become familiar with the material in both the THERM Users Manual and the WINDOW Users Manual. In general, this manual references the Users Manuals rather than repeating the information.

If there is a conflict between either of the User Manual and this THERM 5 / WINDOW 5 NFRC Simulation Manual, the THERM 5 / WINDOW 5 NFRC Simulation Manual takes precedence. In addition, if this manual is in conflict with any NFRC standards, the standards take precedence. For example, if samples in this manual do not follow the current taping and testing NFRC standards, the standards not the samples in this manual, take precedence.

1 aMitchell, Robin1 aKohler, Christian1 aArasteh, Dariush, K.1 aCarmody, John1 aHuizenga, Charlie1 aCurcija, Dragan, C. uhttps://facades.lbl.gov/publications/therm-5window-5-nfrc-simulation01204nas a2200193 4500008004100000245003700041210003600078260001200114300000800126520064300134100002000777700002200797700002500819700002900844700002200873700002400895700001800919856007300937 2000 eng d00aTHERM 2.1 NFRC Simulation Manual0 aTHERM 21 NFRC Simulation Manual c07/2000 a2603 aThis document, the *THERM 2.1 NFRC Simulation Manual*, discusses how to use THERM to model products for NFRC certified simulations and assumes that the user is already familiar with the THERM program. In order to learn how to use THERM, it is necessary to become familiar with the material in the *THERM User's Manual*.

In general, this manual references the *THERM User's Manual* rather than repeating the information.

If there is a conflict between the *THERM User's Manual* and the *THERM 2.1 NFRC Simulation Manual*, the *THERM 2.1 NFRC Simulation Manual* takes precedence.

THERM 2.0 is a state-of-the-art software program, available without cost, that uses the finite-element method to model steady-state, two-dimensional heat-transfer problems. It includes a powerful simulation engine combined with a simple, interactive interface and graphic results. Although it was developed primarily to model thermal properties of windows, it is appropriate for other building components such as walls, doors, roofs, and foundations, and is useful for modeling thermal bridges in many other contexts, such as the design of equipment.

1 aHuizenga, Charlie1 aArasteh, Dariush, K.1 aFinlayson, Elizabeth, U.1 aMitchell, Robin1 aGriffith, Brent, T.1 aCurcija, Dragan, C. uhttps://facades.lbl.gov/publications/therm-20-building-component-model01900nas a2200181 4500008004100000050001500041245014300056210006900199260002500268490001600293520122000309100002201529700002501551700002901576700002001605700002401625856006901649 1998 eng d aLBNL-4210200aTeaching Students about Two-Dimensional Heat Transfer Effects in Buildings, Building Components, Equipment, and Appliances Using THERM 2.00 aTeaching Students about TwoDimensional Heat Transfer Effects in aChicago, ILc01/19990 v105, Part 13 aTHERM 2.0 is a state-of-the-art software program, available for free, that uses the finite-element method to model steady-state, two-dimensional heat-transfer effects. It is being used internationally in graduate and undergraduate laboratories and classes as an interactive educational tool to help students gain a better understanding of heat transfer. THERM offers students a powerful simulation engine combined with a simple, interactive interface and graphic results. Although it was developed to model thermal properties of building components such as windows, walls, doors, roofs, and foundations, it is useful for modeling thermal bridges in many other contexts, such as the design of equipment. These capabilities make THERM a useful teaching tool in classes on: heating, ventilation, and air-conditioning (HVAC); energy conservation; building design; and other subjects where heat-transfer theory and applications are important. THERMs state-of-the-art interface and graphic presentation allow students to see heat-transfer paths and to learn how changes in materials affect heat transfer. THERM is an excellent tool for helping students understand the practical application of heat-transfer theory.

1 aHuizenga, Charlie1 aArasteh, Dariush, K.1 aFinlayson, Elizabeth, U.1 aMitchell, Robin1 aGriffith, Brent, T. uhttps://facades.lbl.gov/publications/teaching-students-about-two01730nas a2200157 4500008004100000050002100041245009800062210006900160520114800229100002901377700002001406700002501426700002201451700002401473856007501497 1998 eng d aLBL-37371 Rev. 200aTHERM 2.0: a PC Program for Analyzing Two-Dimensional Heat Transfer through Building products0 aTHERM 20 a PC Program for Analyzing TwoDimensional Heat Transfer3 aTHERM is a state-of-the-art, Microsoft Windows?-based computer program developed at Lawrence Berkeley National Laboratory (LBNL) for use by building component manufacturers, engineers, educators, students, architects, and others interested in heat transfer. Using THERM, you can model two-dimensional heat-transfer effects in building components such as windows, walls, foundations, roofs, and doors; appliances; and other products where thermal bridges are of concern. THERM's heat-transfer analysis allows you to evaluate a product?s energy efficiency and local temperature patterns, which may relate directly to problems with condensation, moisture damage, and structural integrity.

This version of THERM includes several new technical and user interface features; the most significant is a radiation view-factor algorithm. This feature increases the accuracy of calculations in situations where you are analyzing non-planar surfaces that have different temperatures and exchange energy through radiation heat transfer. This heat-transfer mechanism is important in greenhouse windows, hollow cavities, and some aluminum frames.

1 aFinlayson, Elizabeth, U.1 aMitchell, Robin1 aArasteh, Dariush, K.1 aHuizenga, Charlie1 aCurcija, Dragan, C. uhttps://facades.lbl.gov/publications/therm-20-pc-program-analyzing-two