The energy efficiency of separate sensible and latent cooling (SSLC) airconditioning system is higher than traditional one, since SSLC system uses separate cycles which can raise the evaporating temperature of sensible cycle. Separate cycles often include two separate compressors, which makes the initial investment of SSLC cycle too expensive to use in room air conditioning. A novel structure r...

An experimental rig has been built to test a horizontal scroll compressor and a reciprocating compressor of similar size and capacity. The compressors were tested with refrigerant.R404A operating at varying evaporator and condenser temperatures. The paper provides much needed information regarding the efficiency of the compressors operating under the same conditions with the same system paramet...

During hot seasons the inlet temperature of Nitrogen increases, as a result compressor consumes more power for compressing a specific mass ratio of fluid and consequently total energy consumption of the compressor increases as well. In this research, a three stage centrifugal compressor with intercooler was modeled thermodynamically in order to decreases the energy consumption of the compressor...

Previous work on stabilization of compressor surge is extended to include control of the angular velocity of the compressor. First a low-order centrifugal compressor model is presented where the states are mass flow, pressure rise, and rotational speed of the spool. Energy transfer considerations are used to develop a compressor characteristic. In order to stabilize equilibria to the left of th...

The research on the ultrasonic leak location technology for spacecraft orbit environment is of great significance to ensure long-term normal operation, eliminate leakage in time, maintain cabin and life safety astronauts. Taking wall structure gas pipeline space station as object, aerodynamic sound source characteristics are analyzed, acoustic analyzed extracted. Based theoretical basis, an det...

Dimensionless governing equations of unsteady flow and solutions for the pipeline systems having a surge tank were developed. Frequency domain pressure response expressions two widely used water supply analyzed in dimensionless frequency time domains. One is simple reservoir valve system other with pump check protected by tank. Two different developed performance was compared. The pattern imped...