Air-conditioners (AC) are devices/systems that are used indoors to cool air by reducing the humidity of the air following condensation of the water vapour. It is observed that hyperventilation of cold dry air causes bronchoconstriction in asthmatic patients. [1,2] Modern styles of living in urban areas are considered potentially responsible for the development of airway allergic diseases due to...

Abstract: Increasing demand toward driving comfort steers automobile engineers to spend more and more effort on refining the automobile air conditioning system. The system is of high order and operated at the presence of several disturbances. The control algorithm should be able to control the evaporator out temperature with the acceptable control action. In this work, the sliding mode control ...

Aim: The aim of the study was to evaluate the surface conditioned dentin and its effect on microleakage of metal copings luted with glass-ionomer cement. Objectives: (1) To evaluate the morphology of unconditioned and conditioned dentin, (2) to evaluate the elemental composition of unconditioned and conditioned dentin, (3) to evaluate and compare the microleakage of metal copings luted with gla...

Installing a ground source heat pump as a means of heating and cooling a house is becoming an increasingly popular alternative to the traditional methods. However, the installation costs being very high, an in-depth study of the configuration of such systems is needed in order to minimize these costs. The relationship between power output and controlable parameters, such as pipe radius and leng...

Abstract: In recent years, as part of the remarkable development of electronic techniques, electronic control has been applied to various systems. Many sensors and actuators have been implemented into those systems, and energy efficiency and performance have been greatly improved. However, these systems have been complicated, and much time has been required to develop system controllers. In thi...

This paper describes the efficiency improvement technology of the 3D scroll compressors and the development of 3D scroll compressor for commercial air-conditioner. 3D scroll, our newly developed profile, can compress refrigerant not only radially but also axially. Therefore, higher compression ratio, higher reliability and larger capacity are obtained by introducing 3D scroll. Since the 3D scro...