Study of performance of an Air-conditioning system and cooling load calculation by using developed software for a Building

Abstract

Software development for cooling load calculation specialy for large buildings in countries of 24° north location has been aimed in this research work. Most of the air-conditioning units in service provide comfort air conditioning, the purpose of which is to provide comfortable living conditions inside. Summer cooling systems have become a standard utility in large buildings throughtout the world. Even in climates where summer temperatures are not high, large buildings may have to be cooled in order to remove the heat generated internally by people, lights and other electrical equipments. In the present research cooling load temperature difference method (CLTD) has been taken and all the data are collected from ASHRAE hand book. This software has made by Visual Basic 6.0 version. This software is data base type. After load calculation importance for large building needs duct design, pipe size selection, pump capacity selection, cooling tower capacity ( for water cooled chiller) selection. The conditioned spaces are served by one or more air-supply and return system. Another important part of air-conditioning installation is for commercial, industrial, residential and medical building or hospitals. Some requirements that prevail in office building air conditioning apply to hospital, but there are a number of additional concerns as well. In special cases, like operation theatre, ventilation requirements often specify the use of 100 percent outdoor air and humidity limits may be more severe in operating rooms. The design of an energy efficient system for a hospital that also meets the special requiurements of an engineering challenge. Also important issue is environmental polutions. To protect the earth and to protect the environment is the common issue of the mankind. The traditional electric chiller which takes Freon as its cooling medium has caused great harm to the ozone layer of the atmosphere, which can never be tolerated by mankind. In HVAC applications, a heat pump normally refers to a vapor-compression refrigeration device that includes a reversing valve and optimized heat exchanger. Another HVAC application system is vapor-absorption process. This system uses absorber e.g. LiBr solution. The lithium bromide solution is a non-volatile, non-deteriorating and pollution free. For this reason, this system is environmentaly friendly compare to the vapor-compression system. Here refrigerant used is water. In this system power consumption is comparatively low, so reasonable amount of energy can be saved.