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Studies of the thermal performance of passive solar buildings have indicated a need for precise measurement of solar heat gain and thermal heat loss or gain for modular passive/hybrid solar components in the outdoor environment. A description of the design, calibration, and initial operational results for a new calorimetric test facility designed to perform these measurements is presented in this report. The test facility is located at the National Bureau of Standards in Gaithersburg, MD, and it is anticipated that it will provide a substantial improvement in the measuring techniques for passive and hybrid solar components over the field test cells currently in use. Thermal performance data were taken for four passive solar test articles during the winter of 1982-1983, including two windows and two collector storage walls. Test results are correlated as U-values and Shading Coefficients for the two windows.