Fig. 9-81 shows how the spiral members suited to each other. Abetter view is shown in Fig. 9-82. Two members fit together forming a Crescent-shaped gas pockets. One element remains fixed, while the second member has the right orbit relative to the fixed element.
This movement draws the gas in the outer pocket created by the two members of blocking open up a passage. As the spiral motion continues, gas forced to the center select the form. As pocket constantly decreasing in volume, it is creating more and more high-pressure gas. In the center of the pocket, high-pressure the gas is released from the port of fixed scrolling member. During the cycle, several pockets of gas is compressed at the same time. It provides a smooth, almost continuous compression cycle.
As a result of 10-15% more efficient than with reciprocating compressors.
Smooth, continuous process of compression means that very low flow losses. No valves required. This eliminates any valve losses. Suction and discharge some places. This significantly reduces heat transfer between the suction and discharge gas. No reexpansion volume. This increases compressorheat pump capacity in low ambient operation. Increase heat pump capacity at low temperatures reduces the need for additional heat when the temperature falls.
In summer, this means less Cycling at moderate temperatures. It also allows for better drainage, to maintain a high level of comfort. When the temperature rises, the scroll compressor provides capacity building for more cooling.
Winter scroll compressor heat pumps provide a more warm air in the conditioned space than conventional models.
Compressors 
