Abstract: A polygonal-shaped confetti (2) having at least one folded portion (8). As illustrated herein the polygonal-shaped confetti is rectangular-shaped confetti that is placed in stacks (1) folded on a first end (3) and/or a second end (4). The folded portions slow the descent of the confetti and cause the confetti to turn, spiral and dance in the air. The confetti is created by cutting material, such as paper, tissue, plastic, mylar and so forth into substantially elongated polygonal-shaped pieces and then folding in the middle or on one or both ends over of the stack. The confetti may then be a storage device such as a bag (10), box, tube, rubber bands and so forth that maintains the shape of the confetti until use.

Abstract: An energy analyzer for a refrigeration system including a refrigeration circuit having a compressor, a condenser and an evaporator, and a variable speed drive. A device contains an equation correlating refrigeration system operating performance using a variable speed drive to that of a constant speed drive without requiring the constant speed drive. The equation defines a polynomial expression having different combinations of two variables, the temperature of water entering the condenser, and the ratio defined by the variable speed drive input power divided by the design variable speed drive power. Each of these values is continuously calculated during operation of the refrigeration system. The equation solution correlates to the constant speed input power divided by the design constant speed drive power. From this, energy costs associated with operation of the refrigeration system using the constant speed drive can then be calculated with that of the variable speed drive.

Abstract: An energy analyzer for a refrigeration system includes a refrigeration circuit having a compressor, a condenser and an evaporator, and a first drive type. A memory device contains an equation correlating refrigeration system operating performance using a first drive type to that of a second drive type without requiring the second drive type. The equation defines a polynomial expression having different combinations of two variables, the temperature of water entering the condenser, and the ratio defined by the second drive type input power divided by the design second drive type power. Each of these values is continuously calculated during operation of the refrigeration system. The equation solution correlates to the second drive type input power divided by the design second drive type input power. Energy costs associated with operation of the refrigeration system using the second drive type can then be calculated for comparison with the first drive type.

Abstract: A stability control algorithm is provided for a centrifugal compressor. The stability control algorithm is used to control a variable geometry diffuser and a hot gas bypass valve (when provided) in response to the detection of compressor instabilities. The stability control algorithm can adjust the position of a diffuser ring in the variable geometry diffuser in response to the detection of a surge condition or a stall condition. In addition, the diffuser ring in the variable geometry diffuser can be adjusted to determine an optimal position of the diffuser ring. The stability control algorithm can also be used to open a hot gas bypass valve in response to the detection of continued surge conditions.