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REFRIGERATION AND AIR CONDITIONING

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amirul ariff

on 18 October 2015

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Transcript of REFRIGERATION AND AIR CONDITIONING

MEC 351
REFRIGERATION AND AIR-CONDITIONING
(BILIK FIRDAUS 1)

Prepared by:
AMIRUL 'ARIFF BIN ABDUL MANAF
AZZAMUDDIN BIN AZZIZUDDIN
MUHAMMAD HADRAMI BIN HAMDAN
MUHAMMAD HARIZ BIN RAHAMAT
LOQMAN HAKIEM BIN SULAIMAN
JOVYNER DENOSHAFRY
REFRIGERATION AND AIR CONDITIONING
Literature Survey
.
OBJECTIVE

To making analysis of study room by using
software CAD
(solid work)
To
compare
simulation result and analytic analysis
To
change
the split unit air cond system used in the room with diffuser
.
To fulfill the requirement of the subject syllabus (mini project)

INTRODUCTION
Device that lowers the air temperature
Split Unit system, package system and centralise system
Some of the variables are load change, zoning requirement, space availability and cost
Centralised system is used in large installations with variable needs in different zones
Heating, Ventilation and Air Conditioner(HVAC) equipment is located in the basement, on the roof or outside the

An air conditioning
diffuser distributes air
from a home cooling system into each room.

The diffuser fits into the walls or ceiling at the end of the air conditioning duct, and serves as a vent for cooled air to enter the room
In this project, we
focus on
a few major characteristics in an air flow.

Which are :
Temperature
Relative humidity
Air velocity
Pressure
Density

TEMPERATURE
The range of temperature recommended is 64-74°F (18-23 °C)
The temperature difference in the occupied zone shouldn’t exceed environment temperature that is 84°F (29 °C)

RELATIVE HUMIDITY
Relative humidity levels recommended by different organizations ranges from 40% to 70%.
If the relative humidity greater than 70% causes discomfort to the occupants.


AIR VELOCITY / AIR MOVEMENT
Must include a moving air in the occupied zone.
Still or stagnant air in indoor environments may cause people to feel stuffy.
Besides can cause odour discomfort


VENTILATION
Provide clean air, remove odors, controls humidity, for a complete flow of air.

THERMAL COMFORT
AIR CONDITIONING
BILIK KOMPUTER FIRDAUS 1
15 Tables
15 Student’s chair
20 Flourescents type lights (4 watts/sq. ft)
3 Wooden doors
6 Glass windows

LIST OF EQUIPMENT
RECOMMENDATION
Replace the outlet/exhaust duct to the centre back or centre front of the room.
Ensure the exhaust duct is placed on the edge of a wall to avoid a vortex formation at the outlet.
Reduce the CFM and the temperature of the air conditioner in order to overcome the condensation on the walls and floor.
Rework the placement of the diffusers in order for a better total air distribution for the entire room
RECOMMENDATION
CONCLUSIONS
Accurate and precise calculations needed to be done in order to achieve the most efficient and ideal air conditioning system.
The locations of the diffusers and exhaust duct are absolutely critical.
The right temperature must be controlled to avoid condensations due to temperature difference between inside and outside.
Boundary conditions, radiative surfaces, surface type, environmental aspects, etc. contributes to the slightest change in the air flow.

VIEW OF ROOM
First view
SECOND VIEW

and
collecting information
THIRD VIEW
DIMENSION OF THE ROOM
DIFFUSERS AND EXHAUST DUCT
Cooling Loads - Latent and Sensible Heat
The
sensible cooling load
refers to the dry bulb temperature of the building and the latent cooling load refers to the wet bulb temperature of the building. In the summer, humidity influence in the selection of the HVAC equipment and the latent load as well as the sensible load must be calculated.
Latent heat load
- humidifying and dehumidifying - and required air volume to keep temperature constant at various temperature differences between entering air and room air are indicated in the

Factors that influence
to
the sensible cooling load
Glass windows or doors
Sunlight striking windows, skylights, or glass doors and heating the room
Exterior walls
Partitions (that separate spaces of different temperatures)
Ceilings under an attic
Roofs
Floors over an open crawl space
Air infiltration through cracks in the building, doors, and windows
People in the building
Equipment and appliances operated in the summer
Lights

COOLING LOAD ESTIMATION TABLE
WHY ?
ANALYSIS
In order to design the capacities of a heating, ventilating and air-conditioning (HVAC) system's elements, configuration of the building and the HVAC system for minimizing energy consumption, it is very important to know the air-conditioning, heating and cooling load of a building.
TOP VIEW
Full transcript