Air conditioning systems for buildings

Refrigeration – Cooled enclosure – Plural cooled compartments

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Details

62 79, F25D 1302, F25B 700

Patent

active

041249984

ABSTRACT:
An air conditioning system for a building having a building cooling load is described. The system includes a cooling circuit for a cooling fluid. The building cooling load is connected in the circuit. The circuit includes means for circulating the cooling fluid unidirectionally in the circuit and through the building cooling load, and means for cooling the fluid. The system also includes means for delivering fresh air to the building, including an inlet duct having a outer end communicating with ambient air outside the building, and means for drawing air into the building through the duct. The cooling circuit includes a heat transfer coil connected in the circuit upstream of the cooling means and defining a fluid flow path for the cooling fluid. The coil is arranged in the fresh air inlet duct so as to allow heat energy transfer between air in the duct and fluid in the coil. The coil has respective first and second ends spaced longitudinally of the duct with the second end closer to the outer end of the duct than the first end. The circuit further includes fluid flow crossover means associated with the coil. The crossover means is operable to cause cooling fluid to flow either in a forward direction from said first end of the coil to said second end or in a reverse direction from said second end of the coil to said first end. Accordingly, in conditions of low temperature ambient air, the fluid can be circulated through the coil in said reverse direction in order to minimize the overall heat loss from the cooling fluid to the incoming air as the fluid travels from end to end of the coil.

REFERENCES:
patent: 2718766 (1955-09-01), Imperatore et al.
patent: 2975609 (1961-03-01), Allander et al.
patent: 3247678 (1966-04-01), Mohlman
patent: 4024728 (1977-05-01), Gustafsson

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