Abstract
The energy balance of Hydraulic Confined Piston Engine (HCPE) is the key to understanding its working mechanism, improving its efficiency. The working principle of HCPE was presented, and the energy balance for the rated condition and application characteristics for the full conditions were also studied. Taking the low thermal value of fuel into account, the percentage of energy loss related to combustion is 54.99%, the percentage related to friction is 5.59%, the hydraulic loss is 1.92% and the other losses are 1.10%; the efficient work is 36.40%. The efficient work and the loss related to combustion are similar to those of a hydraulic free piston engine and medial speed diesel engine.
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