Abstract: A pin jet nozzle for providing an evaporative fog in evaporative cooling systems or the like has a body member with an internal bore for receiving fluid under pressure, and an orifice receiving chamber integrally formed in the upper surface of the body member. The orifice receiving chamber is unitary with the body member and in fluid communication with the internal bore. An orifice member is directly secured in the orifice receiving chamber so that an orifice of the orifice member is coaxial with the internal bore. A pin member has an impingement pin with an impingement face that is spaced from, and in alignment with, the orifice.

Abstract: The present invention comprises an ultra-dry fog box for the emission of a fog along a dimension, comprising a fog retention enclosure, having a length along which a fog is desired. In principal part, the enclosure includes at least one emission opening along the length of the enclosure for the emission of a fog. The enclosure further includes at least one inlet passage permitting the intake of ambient air and an internal circuitous path within the enclosure comprising a flow path between the inlet passage and the emission opening. The flow path includes at least in part, a near reversal of a flow from a gravitational direction. The enclosure further includes the capability to create a flow of ambient air into the inlet passage of the enclosures, and out of the enclosure through the emission opening. At least one pin jet nozzle is included in the enclosure to provide a fog, with the nozzle placed so that fluid discharged from the nozzle will enter the flow path.

Abstract: The present invention shows an improved pin jet nozzle for use in providing an evaporative fog consisting essentially of fluid particles having a diameter of less than fifty micrometers (50 .mu.m.). In the preferred embodiment, the nozzle of the present invention comprises a base portion, a pin portion, and a nozzle insert component. In particular, the nozzle insert comprises:an insert member comprising a hollow, generally cylindrical insert adapted to be held firmly within the outlet orifice of the base portion of a pin let nozzle; and,an orifice member held firmly within the generally cylindrical insert member, which orifice member comprises:A. a wear-resistant material;B. a central orifice with a diameter of six one-thousandths of an inch (0.006 in.); and,c. a high degree of concentricity, with a variance in the concentricity of the central orifice of less than two ten-thousandths of an inch (0.0002 in.).