ABSTRACT One possible means of decreasing the work of compression of a scroll gas compressor is by injecting, or flooding, high specific heat liquid into the inlet gas stream of the compressor. The high specific heat liquid can then absorb the heat of compression of the gas and offer the possibility of a reduction in the net power of the compressor. The particular application of interest for this flooded-compression technology is the Liquid-Flooded Ericsson cycle as proposed by Hugenroth et al. (2007), a gas refrigeration cycle. Adequate performance of the Ericsson cycle is contingent on designing scroll compressors that can efficiently compress high heat of compression gases. A detailed model of the flooded scroll compressor has been constructed which allows prediction of the compressor performance over a wide range of operating conditions. The detailed flooded scroll compressor model has been validated with experimental data, for which good agreement was found. 1. INTRODUCTION A vapor-compression scroll compressor has been modified to run on a mixture of gas and oil. Originally the compressor was an automotive R134a compressor, but due to its semi-hermetic design it could easily be modified for use with liquid flooding. The radial compliance and discharge valve were removed, but otherwise the compressor was off-the-shelf. Previous investigators (Li 1992, Hiwata 2002, Oku 2006) have experimentally researched flooded compression in scroll compressors, though their studies were based on vapor compression systems, and the compressors were not optimized for liquid flooding.