Latent heat storage is an economical way to achieve energy
efficiency and improve thermal comfort in buildings.
In this research, the effects of using PCM Wallboards in a
residential apartment envelop located in Homs was studied by PCM
Express so
ftware.
PCM wallboard with 23°C melting temperature was used and
installed on the inner face of the walls and ceiling of the apartment.
This investigation shows that the importance of using PCMs in
buildings envelope, compared with conventional thermal insulation
materials, due to the effectiveness of PCMs materials and storing
and releasing of thermal energy, which contributed to reducing of
thermal loads and improved the internal thermal comfort.
Thermal energy can be stored as a latent heat in building structures
by materials with low phase change temperature called phase
change materials (PCM).
In this paper, an analytical and mathematical study of the PCM
wallboards was done by simulat
e its thermal behavior, depending on
governing heat transfer equations which describe the phase change
process of the PCM wallboard.
In this paper, an analytical and mathematical study of the PCM
wallboards was done by simulate its thermal behavior, depending on
governing heat transfer equations which describe the phase change
process of the PCM wallboard . A mathematical model
was done
and used to simulate the thermal behavior of several different
structures of the wall (single PCM wallboard, PCM wallboard +
thermal insulation layer, PCM wallboard + a concrete block).
The Control strategy for linear switched reluctance motor elevator is an important
issue, which effects on the performance of the elevator .
This strategy consists of four control loops , Current , Force , Velocity and position
feedback control lo
ops . For the force control loop , anew force distribution function
( FDF) is proposed . The trapezoidal velocity profile is introduced to control the vertical
movement position smoothly during the elevator's accelerate, decelerate and halt
operations.
Conventional proportional plus integral (pI) controller is used for the current and
velocity control loops and their designs are described .
The proposed control strategy is dynamically simulated by Matlab .
The present paper provides a mathematical dynamic modelling and analysis of a newly developed electrical power supply system for petrol cars. The main goal of this research work is to improve the economic operation of the car’s electric power supply
aiming at fuel economy improvement and for less gases emission. The proposed scheme has been studied and investigated using MATLAB/SIMULINK(R) toolbox and C language. The dynamic behaviour of the proposed system has been analysed for two different driving cycles and the results showed a fuel economy improvement in the investigated two cases.
It is shown that the proposed approach is very superior to the conventional one, which is widely used in most of public cars. However, it also shows very encouraging results in terms of fuel save and less gas emission. The main advantage of the method proposed is its applicability to any first or second hand low cost cars.
