| 摘要 |
1,216,608. Heating and cooling buildings. BORG-WARNER CORP. 14 June, 1968 [28 June, 1967], No. 28456/68. Heading F4U. In an air heating and cooling system having a single main 10a, 106 supplying heated and chilled liquid alternately for predetermined intervals to units 16 in a number of zones A, B, C sensing means 40, 42 are provided to ensure that if cooling is required a pump P supplying the heat exchanger 24 is only set in motion if cooling liquid is being circulated throughout the system. Similarly, when more heat is required the pump P will only be set in motion if hot liquid is being circulated. The system includes a timer 19, which may be programmed or operated manually, and which at intermediate load conditions will cycle a valve 18. Under other conditions the valve 18 permits heated or chilled liquid to circulate. Liquid returning via the main 10b has its temperature sensed at 104 as a result of which a valve 100 directs the returning liquid to the chiller inlet 103 or to the heater inlet 107. The ratio of the time hot water is circulated to the time cold water is circulated is dependent upon the relative heating to cooling needs as determined by sensors 114, 116 connected to the timer 19. Each unit 16 comprises a heat exchanger 24 and fan 22, an inlet 25 from the main and a return 27 to the main, also a by-pass 43 containing sensor 42. A pump 36 and one way valve 41 are provided in inlet 25. The fan coil unit may alternatively be an induction unit. |
