Abstract: A refrigeration system having a low stage and a high stage circuit. Each stage having a compressor, an evaporator or a condenser. The low stage includes a low stage refrigerant comprising R744. The high stage includes a high stage refrigerant having a GWP less than 500. The system further includes a heat exchanger configured to transfer heat from the low stage refrigerant to the high stage refrigerant allowing the circuits to provide cooling in two stages.

Abstract: A refrigeration system having a low stage and a high stage circuit. Each stage having a compressor, an evaporator or a condenser. The low stage includes a low stage refrigerant comprising R744. The high stage includes a high stage refrigerant having a GWP less than 500. The system further includes a heat exchanger configured to transfer heat from the low stage refrigerant to the high stage refrigerant allowing the circuits to provide cooling in two stages.

Abstract: A refrigeration system having a low stage and a high stage circuit. Each stage having a compressor, an evaporator or a condenser. The low stage includes a low stage refrigerant comprising R744. The high stage includes a high stage refrigerant having a GWP less than 500. The system further includes a heat exchanger configured to transfer heat from the low stage refrigerant to the high stage refrigerant allowing the circuits to provide cooling in two stages.

Abstract: A refrigeration system having a main circuit including a main compressor thermally coupled with a secondary or subcooling circuit. The main circuit uses a HFC blend, such as but not limited to, R125/R143A blend or R32/R125/R134A blend as a refrigerant and the subcooling circuit uses an R32 blend. Some embodiments may include more than one main compressor. Some embodiments of the secondary circuit may include more than one secondary compressor. The combined system of differing refrigerants provides increased efficiencies and reduced Global Warming Potential (GWP) over single refrigerant systems for low and medium temperature refrigeration applications.

Abstract: A refrigeration system having a main circuit including a main compressor thermally coupled with a secondary or subcooling circuit. The main circuit uses a R125/R143A blend as a refrigerant and the subcooling circuit uses an R32 blend. The combined system of differing refrigerants provides increased efficiencies and reduced Global Warming Potential (GWP) over single refrigerant systems for low and medium temperature refrigeration applications.

Abstract: An integrated refrigeration and dehumidification unit cooler for a refrigerated space, such as a cold room, includes directly serially connected refrigeration and heating coils operationally interfaced to effect passive control of room temperature and humidity conditions preventing overhead condensation.

Abstract: A multiple stage dehumidification and cooling system wherein a first stage direct expansion dehumidifier operating at its optimum dew point to an entering high humidity, high temperature air stream and effecting a first lowering of the temperature and humidity of the air stream, with the conditioned air stream being serially conveyed to a second stage chilled liquid dehumidifier operating at its optimum dew point to effect a second lowering of the temperature and humidity, and thereafter to a third stage reheat coil for providing an exiting air stream of desired temperature and humidity conditioning. The synergistic coupling provides significant power saving over the prior alternatives of desiccant and chilled liquid systems and the stages are individually modulated to reduce power consumptions as the load temperature and humidity set points are approached.

Abstract: A secondary loop refrigeration system includes plural refrigeration zones serially connected in a secondary cooling loop using a R-134a as a liquid refrigerant in increasing order of operating temperatures, the secondary cooling loop being in heat exchange relationship with a primary cooling loop using direct expansion refrigerants. The primary cooling loop may be selectively isolated allowing the latent heat of the units in the zones to increase the circulating temperature of the secondary refrigerant sufficient to defrost the cooling coils.

Abstract: An indoor ice rink facility is provided with a dehumidifier coil connected with the ice rink refrigeration coils in a secondary refrigerant loop and a reheat coil coupled with the primary refrigerant loop for maintain the ice sheet and controlling the humidity of the facility in a single system.

Abstract: A secondary loop refrigeration system includes plural refrigeration zones serially connected in a secondary cooling loop using a liquid refrigerant in increasing order of operating temperatures, the secondary cooling loop being in heat exchange relationship with a primary cooling loop using direct expansion refrigerants. The primary cooling loop may be selectively isolated allowing the latent heat of the units in the zones to increase the circulating temperature of the secondary refrigerant sufficient to defrost the cooling coils.

Abstract: A kite accessory release system for dropping toy projectiles and related items from a kite during flight is disclosed. The system includes a kite accessory release device comprised of a generally rectangular sheet of a deformable rubber material having at least one expandable slot formed therein to receive a release tab formed on each of the toy projectiles. The release device is deformable when stretched linearly so as to open the slot retaining the toy projectile and to allow it to fall by gravity from the device during flight of the kite. The release device is adaptable for use with various toy projectiles of different configurations such as toy bombs, airplanes, missiles, gyrocoptors, and parachutes.