Expansion Engines

The Expansion Engine is vertical, single acting, reciprocating type. This produces the cold required for the plant. High- pressure air enters through inlet valve at the start of downward stroke of the piston. On further downward motion, the inlet valve closes and entrapped Air expands. During upward stroke, outlet valve remains open and inlet valve remains closed.
Therefore, in downward stroke Air enters the cylinder and expands. In the upward stroke the expanded air is pushed outside. The electric Motor is used to start the machine. Thereafter the Engine is moved by the Air pressure itself and during which time, the Engine motor retains the speed by acting as a brake. Since work is done by Air in rotating the flywheel, it loses itskvk corporation heat content (enthalpy), thus the Air gets cooled. This cooling is more than that of an expansion in an Expansion Valve.
An elementary factor for the function of an Expansion Engine is to use dry and carbon Dioxide free Air, as otherwise, ice and dry ice will form on valve seats, causing mal-function. The approx. temperature drop across Expansion Engine is 50 to 70i? C, depending on inlet air pressure, temperature and inlet cam position.