In the present research, performance validation of a Heating, Ventilation, and Air Conditioning (HVAC) system operating in a library building was conducted. The operating HVAC system was studied in terms of the provided indoor air conditions and energy consumption level. The fieldwork measurements showed that the HVAC system is not capable of providing the desired indoor air conditions based on...

Discharge air/gas from compressors is often not of the right quality for certain uses unless it is suitably treated. The various contaminants present in compressed air/gases include atmospheric pollution, compressor wear particles, bulk lubricating oil and aerosols, watervapour and condensed water, oil/ water emulsion, rust and carbon. Suitable treatment of the air/gases involves the removal of...

A semi-empirical model for simulating thermal and energy performance of an automotive air-conditioning (AAC) system in passenger vehicles has been developed. The model consists of two sections, namely empirical evaporator correlations and dynamic load simulation. The correlations used consider sensible and latent heat transfer performance of the evaporator coil. The correlations were obtained f...

An experimental study of hydrodynamics of film cooling is performed by using a single longitudinal slot on a cylindrical model simulated to the leading edge of the gas turbine blade. The model is set up into the test section of an open-circuit induced flow wind tunnel which provides the main flow. The injected air, as a secondary film flow, produced from a high pressure compressor is considered...

The paper presented and analyzed the main types of generators and ozone aeroions and proposed construction of two new generators, which combine the functions of cooling and the electrodes and pressing process gas containing oxygen, eg air. The first generator has no mobile parts and consists of a system of electrodes for dielectric barrier discharge with a compressor and electrogasdyinamic main...

The energy regulation on the refrigeratory compressor is described. Both the energy-saving principle and performance of conversion compressor are discussed in detail. Two different modes of the control for compressor, frequency conversion cooling and full-frequency run, are compared here. It is concluded that frequency conversion is better than full-frequency on energy-saving. The energy saving...

This paper deals with open-shaft twin-screw refrigeration compressors in the 10 175 m3/h (10 100 CFM) range. Applications for such compressors are, for example,external combustion engine heat-pumps and transport refrigeration. The twin-screw compressor concept is discussed from following view-points; operational mode and rotor housing design drive arrangement bearings lubricants cooling volume ...

In this paper, a kind of on-board liquid hydrogen (LH2) cold energy utilization system for heavy-duty fuel cell hybrid truck is proposed. Through system, the LH2 used cooling inlet air compressor and coolant accessories sequentially, to reduce parasitic power, including compressor, water pump, radiator fan power. To estimate ratio power saving capabilities model based on AMESim software was est...