Patent GB-932764-A (GB)
Title: Air conditioning systems
IPC: F24F11/08
Filed: 1960-05-19
Abstract: 932,764. Air conditioning systems. YORK SHIPLEY Ltd. (York Division, Borg Warner Corporation). May 19, 1960, No. 17696/60. Class 137. An air connditionig system for multi-roomed buildings is provided with a primary air conditioner 10 from which " neutral " air is passed to a plurality of induction units 11 (only one of which is shown), via fan 18 and duct 21. The air is discharged through nozzles 25 so as to induce secondary air into the units from the zones to be conditioned, through heat-exchangers 23 to which either hot or cold water is supplied, but never a mixture of the two, and a mixture of primary and secondary air is discharged through outlet 26 into the zones. In the form shown, the primary air conditioner 10 comprises preheat and afterheat coil 14 and 17, respectively, which are primarily used during the winter period and supplied with a heating medium such as steam. Dehumidification and cooling is obtained by chilled water coil 15 in the primary unit 10 when the outside air temperature is above 40 F., and when below this temperature, valve 44 is adjusted so that chilled water by-passes coil 15 round line 45. The chilled water circuit starts at pump 36, passes through heat-exchangers 39 and 29 via coils 38 and 41, respectively, through valve 44, control valve 47, heat-exchanger 23 and back via line 49 to pump 36. If more chilled water is being pumped than required by the induction unit 11, then part flows through relief valve 53 and line 52 back to pump 36. During the summer period, the refrigeration unit is in operation. This consists of compressor 27, condenser heat-exchanger 28, expansion valve 33 and evaporator or chilled water heat-exchanger 29. Heat from the refrigerant in the condenser is passed to the condenser cooling water. The condenser water circuit consists during the summer period of cooling tower 80, cooled by fan 81, pipe 83 leading to pump 65 and condenser 28. Valve 70 controls the amount of condenser water passing through by-pass 84. The circuit then continues to valve 73 which controls the flow through heating coil 16 in the primary unit 10, the surplus flowing through by-pass 85. The water then returns to the cooling tower via heatexchanger 77, inoperative during the summer period. During the winter period when the refrigerating circuit is inoperative, pump 65 is stopped and pump 86 started. The chilled water is then cooled in heat-exchanger 39 with heat-exchanger 29 inoperative. The hot water circuit consists of pump 54, coils 56 and 59 in heat-exchangers 57 and 60, respectively, pipe 61 leading to control valve 47 and heat-exchanger 23, returning via line 49 back to pump 54. By-pass 63 is controlled by relief valve 64. During the summer period, heat is derived from the condenser water leaving the condenser 28 and during the winter period by a heating medium such as steam passing into heat-exchanger 60 through thermostatically controlled valve 116. During freeze-up periods, the condenser water circuit is safeguarded by passing steam into heat-exchanger 77 via thermostatically controlled valve 100. Primary air is filtered with filter 13 in the primary unit 10.