초록 ▼

Air conditioning and refrigeration apparatus for controlling the temperature of a conditioned space to a predetermined temperature band adjacent to a predetermined set point temperature via cooling and heating cycles utilizing a supply of pressurized cryogen. A cryogen driven motor drives a fan and

Air conditioning and refrigeration apparatus for controlling the temperature of a conditioned space to a predetermined temperature band adjacent to a predetermined set point temperature via cooling and heating cycles utilizing a supply of pressurized cryogen. A cryogen driven motor drives a fan and an alternator. The alternator provides control voltage for operating electrical control devices which select a heating cycle, or a cooling cycle, as required, and which control the flow of cryogen during the selected cycle. Electrical load on the alternator, and thus a load on the vapor driven motor, is minimized to maintain air delivered by the fan to the conditioned space at a level which provides a substantially uniform air flow and temperature throughout the conditioned space. A cryogen flow control valve is motor controlled and only requires electrical energy when a change in the cryogen flow rate is desired. Heating and cooling cycle selecting valves require no electrical energy during a cooling cycle, and very little electrical energy during a heating cycle, as cryogen pressure is utilized to shift the heating and cooling cycle selecting valves when a heating cycle is desired.

대표청구항 ▼

[ We claim:] [1.] A refrigeration unit for controlling the temperature of a conditioned space to a predetermined temperature band adjacent to a predetermined set point temperature via heating and cooling cycles, including a supply of pressurized cryogen, a flow path for the cryogen, heat exchanger m

[ We claim:] [1.] A refrigeration unit for controlling the temperature of a conditioned space to a predetermined temperature band adjacent to a predetermined set point temperature via heating and cooling cycles, including a supply of pressurized cryogen, a flow path for the cryogen, heat exchanger means in the cryogen flow path associated with the conditioned space, cryogen heating means in the cryogen flow path, and a cryogen driven motor and fan in the cryogen flow path which provides air circulation between the heat exchanger means and the conditioned space, the improvement comprising:electrical generator means driven by the cryogen driven motor,control means connected to said electrical generator means,said control means selectively configuring the cryogen flow path to provide heating and cooling cycle flow paths, with the cryogen heating means being in the heating cycle flow path,said heat exchanger means having first and second heat exchanger sections each having an inlet and an outlet,said control means including a three-way valve and vent valve means,said three-way valve having an inlet connected to the outlet of the first heat exchanger section, a first outlet connected to the inlet of the second heat exchanger section, a second outlet connected to the cryogen heating means, and a vent outlet,said three-way valve being biased to select the first outlet of the three-way valve when the vent outlet is closed, and operable by cryogen pressure to select the second outlet of the three-way valve when the vent outlet is open,said vent valve means being connected to the vent outlet of said three-way valve,said vent valve means being operable to open and close the vent outlet of the three-way valve, to respectively select heating and cooling cycles.