Abstract: An electrostatic precipitation air cleaning system for removing mist, smoke or particles from an air stream. The electrostatic precipitation air cleaning system includes an ionizer, a collector, and an exhaust fan configured to draw the air stream through the ionizer and the collector. The electrostatic precipitation air cleaning system includes a high voltage power supply that provides an ionizer voltage to the ionizer and at least a first collector voltage and a second collector voltage. The electrostatic precipitation air cleaning system includes an electrostatic precipitator controller coupled to or integrated with the high voltage power supply and operable to select one of the at least the first collector voltage and the second collector voltage to provide to the collector.

Abstract: A coolness storage system for a closed loop refrigeration system having a fixed capacity compressor wherein a phase change material (PCM) in a plurality of chambers around conduit runs arranged in parallel in an evaporator in the system alternately freezes and thaws to modulate the cooling effect on process air flow through the evaporator when the compressor is not operating and to extend the duration of compressor off time.

Abstract: A self-contained ventilation apparatus is disclosed for ventilating buildings, e.g., patient rooms such as hospital rooms, waiting rooms, hospital operating rooms, doctors' offices, and clinics, especially rooms contaminated with infectious microorganisms. One or more blowers is provided. When there are two blowers, a first blower is provided for discharging room air to the atmosphere and a second blower is provided for introducing fresh outside air to the room to provide a continuous supply of fresh air to the room which is free of disease organisms. Both streams of air pass through an air-to-air heat exchanger to adjust the temperature of the incoming air to approach that exhausted from the room. When filters are used, both currents of air are preferably filtered, e.g., with a high efficiency particle air (HEPA) filter. Provision is made for automatically maintaining room air pressure at the desired value (typically below that of surrounding rooms) as filters gradually become clogged with dust.

Abstract: A method and apparatus for controlling temperature and humidity of an air stream by chilling a cold storage material and warming a heat storage material by evaporation and condensation respectively from a fixed capacity refrigeration cycle, and selectively cooling and warming the air stream by controlled heat transfer from the cold and heat storage materials.