Air-Water System Design using Revit Mep for a Residential Building

Copyright © 2019 by author(s) and International Journal of Trend in Scientific Research and Development Journal. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0) (http://creativecommons.org/licenses/ by/4.0) ABSTRACT In this project we discussed the study and performance of air conditioner, air refrigeration and water conditioner system in a single unit. The main objective of this project is to develop the multifunctional system which can provide refrigeration effect, cold water and air conditioning effect with in regular air or space conditioning system. Air and water systems conditioning spaces by distributing the both conditioned air and water to the terminal units installed in the spaces for which the basic plan is given by civil department and the basic design is done by using REVIT MEP software. The air and water are heated or cooled in a central mechanical equipment room. The air supplied is termed as primary air to distinguish it from the recirculated or secondary room air. By using the peak cooling load values obtained in the heating and cooling load calculations the ton of refrigeration values for individual and total area is calculated which will be helpful for selection of accurate design for the residential building.


INTRODUCTION
In air-water systems both air and water are used for providing required conditions in the conditioned space. The air and water are cooled or heated in a central plant. The air supplied to the conditioned space from the central plant is called as primary air, while the water supplied from the plant is called as secondary water. The complete system consists of a central plant for cooling or heating of water and air, ducting system with fans for conveying air, water pipelines and pumps for conveying water and a room terminal. The room terminal may be in the form of a fan coil unit, an induction unit or a radiation panel. Even though only one conditioned space is shown in the schematic, in actual systems, the air-water systems can simultaneously serve several conditioned spaces

Types of systems
The basic types are 1. All-water systems, 2. All-air systems, 3. Air-water systems, 4. Heat pump.

Local Systems
All

LITERATURE SURVEY Pete Jacobs (2003) explains The Small HVAC System Design
Guide that provides design guidance on how to improve the installed performance of small packaged rooftop HVAC systems in commercial buildings. The document is targeted at architects, engineers, and design/build contractors involved in the design of small packaged rooftop systems for commercial building applications. It includes information and advice on overall building design practices to minimize HVAC loads, unit selection and sizing, distribution and control system design, commissioning, and operations and maintenance. By applying the integrated design principles in this document, the energy consumption and costs of buildings with small HVAC systems can be reduced by 25% to 35%. Impacts on building first costs are minimized through a combination of load avoidance strategies designed to reduce the size and cost of the HVAC system, with simple paybacks of about 0.2 to 2.4 years. Along with integrated design, other design strategies suggested in this document focus on establishing and maintaining efficient operation of systems as they are installed in the field. Problems with equipment and controls (economizers, fan controls, thermostat programming), in-situair flow and fan power, refrigerant charge, and operation/maintenance practices that can lead to poor system performance are addressed. together with knowledge of the physical configuration of the HVAC components and their relationships in systems. Omar et al. calculated the hourly cooling load due to different kinds of wall, roof and fenestration using transfer function method (TFM). The output of this method was compared with the well-known Carrier program and the results were acceptable. In the case of cooling load, when the results were compared with the ASHRAE examples, some differences were noticed due to wall and roof. They also studied the effects of changing the wall color on cooling load.
Adnan Shariah et al. studied the effect of the absorptance of external surfaces of buildings on heating, cooling and total loads using the TRNSYS simulation program. Two types of construction materials, namely heavy weight concrete block and light weight concrete were used in the simulation. They also calculated the effects of the absorptance on energy loads for insulated buildings. They reported that, for uninsulated buildings, as the absorptance was changed from one to zero, the total energy load decreased by 32%, while for insulated buildings, it decreased by 26% in Amman. Whereas the decrease was about 47% for uninsulated and 32% for insulated buildings in Aqaba

METHODOLOGY Design of the building:
The basic design of the residential building is done using the REVIT MEP software based on the plan given by civil department. According to the plan the design of FCU (fan coil unit) is prepared and the heating and cooling load values are obtained for each and every space of the designed building and the values are mentioned in the following tables given below.
International The basic plan is drawn in the above fig.3 based on the design parameters and the ceilings and roofs are mentioned in the below fig.4 and fig.6 and the layout is shown.    The Capacity of unit required is 21.32 TR approximately but used 25-28 TR machine to avoid the fluctuations in the working.
Based on the obtained cooling air flow values for each room and for all the floors the Duct Design was done by using AUTO_ DESK REVIT software. All the diagrams were shown in the civil plan .Thus we can reach to a conclusion that our estimated values are enough to establish the air conditioning system in the specified location. By using HVAC system energy consumption of the building is reduced as possible by avoiding unnecessary losses. This is one of the most well designed and most useful methods in the present day installations.