This paper provides updated information on the Department of Energy/Oak Ridge National Laboratories (DOE/ORNL) Braun Heat Pump Program. This paper includes highlights of the measured Coefficients of Performance (COP) values achieved with the BR-105R.2 engine/refrigerant compressor, which significantly exceed contract requirements and measured COP values reported before. It describes the breadboard test rig and the results of corroborating engine efficiency tests performed by a major independent laboratory. This paper also addresses the status test results and selection methods of the critical Braun Hermetic Seal which prevents loss and contamination of the pumped refrigerant. Information is also supplied on qualifying the Braun BRI05R.2 model for operation with natural gas.

Units: I-P