Room ejection unit of central air-conditioning

A room ejection unit of a central air-conditioning system comprising, a housing defining a mixing chamber and having an inlet port communicating with said mixing chamber for communicating with the exterior and an outlet port above the mixing chamber in communication therewith;

• a heat exchanger installed in said housing adjacent the inlet port and constructed as a direct-contact apparatus with a sprayed packing;
• an air humidifier in the housing adjacent the inlet port having sprayers for spraying water on said packing, a drip pan below the sprayed packing for receiving water from the sprayers dripping from the sprayed packing, a pump drawing water from the drip pan and providing it to said sprayers, a primary air supply manifold having nozzles arranged in a lower part of the mixing chamber for delivery of air into an upper part of the mixing chamber for mixing with a flow of air from said heat exchanger and humidifier in a direction toward the outlet port;
• a pressure chamber installed in the lower portion of the mixing chamber and having an underflow wall extending into the drip pan and a cover, and a pipe providing communication for said pressure chamber with said drip pan under said cover and said underflow wall and said primary air supply manifold for inducing air under pressure in said pressure chamber to raise the level of water in the drip pan to a desired level for said pump.