Device for influencing the temperature of evacuate

摘要

1,240,521. Air heating or cooling units. LTG. LUFTTECHNISCHE G.m.b.H. 25 July, 1968 [24 Aug., 1967], No. 35488/68. Heading F4V. An induction ventilating and heating or cooling unit comprises a housing 10SP1/SP containing cooling and heating heat exchangers 54, 55 respectively and two pivoted or sliding valves 52, 53 controlling the secondary air flow therethrough, wherein when one valve is in an open position, the other is held in a closed position. In another embodiment, the valve 52 is replaced by two or more pivoted flaps and the air inlets to the heat exchangers and to a by-pass are covered by filters. The valves 52, 53 are controlled hydraulically, by an electromotor or, as shown, by a pneumatic cylinder and piston device 66 in response to a room thermostat. The flap valves 52, 53 shown are rotated by arms 58, 59 which are connected respectively to the cylinder and piston of the device 66. In the position shown in Fig. 8, the weight of the cylinder holds the flap 52 closed, while the flap 53 is spring urged to an open position. As air is fed into the cylinder, the flap 53 closes and thereafter, the cylinder rises relative to the then static piston to open the flap 52. The flaps 52, 53 alternatively may be spring biased to a closed position. The device 66 is situated outside the casing 10SP1/SP.