Energy audit report

ENERGY AUDIT REPORT

ENERGY AND ARCHITECTURE

VISHAY GOINDO I 0335676

TUTORED BY DR SITI NORZAINI

INTRODUCTION Energy Audit E-Report

Sun Path Wind Path Climatic data

Occupants Profile

The bulding is slightly angled to The wind blows mainly from south
north-east, making the east facade east and but the wind is partially
expose directly to the morning sun blocked due to the neighbouring
and due to the angled orientation houses. But the facade with the
the front of the building also most windows are facing the wind
receives a minimal amount of direction which gives good
sunlight opprtunity for cross ventilation.

The building is located in Mauritius, which is a tropical island, in the Heat Map Illuminance level
Indian Ocean. It a single storey building with 4 occupants. The building
has 3 bedrooms. The energy audit is based on the data collected in April
2021.

Sollar Study Temperature(°C)) Approx. lux value

Garage 26-27 Garage 200 lux
27-28 150 lux
Living room 28-29 Living room 100 lux
29-30 50 lux
Bathroom Room 3 Room 2 Bathroom Room 3 Room 2
0 lux
Toilet Toilet

8AM 12PM 4PM Kitchen Room 1 Kitchen Room 1
Dinning Dinning
The morning sun hits room During mid-day the sun In the afternoon the sun hit
1 and room 2 directly since cast a partial shadow in the east and south façade Ground Floor Ground Floor
there are nothing front of the house. which has less impact since
obstructing the sunlight there are less openings on
towards that façade. that side of the house

HOURLY ENERGY USAGE Energy Audit E-Report

ENERGY LOAD PROFILE Energy Audit E-Report

ELECTRICITY BILL CALCULATION ESTIMATION PER DAY AND MONTH

Estimate Energy Usage Per Day Estimate Energy Cost Per Day

22.92 kWh Rs 166.55

Estimate Energy Usage Per Month Estimate Energy Cost Per Month

664.05 kWh Rs 4996.5

ENERGY CONSUMPTION PATTERN Energy Audit E-Report

4 High Energy Consumption Appliances

High Energy Use

High Energy Use At night the energy Refrigirator
17%
Energy usage(kWh) At this period of use gradually Air Conditioner
increases as all 52.3%
3 time 3 air members are
Low Consumption
conditioning is

running to cool During the day there using different

down the are minimal use of spaces and most

2 temperature in the vampire appliances of the lights are Light
10.5%
bedrooms hence lower energy turned on.

consumption a

52.3% Washing Mashine

1 3.9%

TV Oven
Charger 5.9% 2%

0 6.5%
0000 0100 0200 0300 0400 0500 0600 0700 0800 0900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300

Weekedays Weekends The line graph above shows the hourly energy usage comparison during weekdays and weekends. It
shows that the increasing and decreasing patterns are almost the same everyday but weekends has
Top 5 vampire appliances
higher energy consumption at night . But overall, the daily basic routines are almost the same

Occupants Activities & Behavior 1 Air conditioner 3 Light

HOURS CONSUMPTION DESCRIPTION 13.5 kWh 1.64 kWh
per day per day
0000 - 0400
0500 - 0800 HIGH Energy consumption is at its peak at 0000 but it decreases as it approaches 0400 since the temperature 2 Refrigirator 4 Television
0900 - 1500 is cooler early in the morning and the use of air conditioner is decreased as well
2.8 kWh 0.72 kWh
1600 - 2300 LOW Energy consumption is the lowest at this time period since most of the house members are still sleeping per day per day
and the house's atmosphere is cool and has enough morning light to illuminate the spaces

MODERATE During this time period the energy consumption increases a bit due to household activities, like washing 5 Electrical charger
clothes, cooking and cleaning.
1.10 kWh
HIGH Energy consumption is highest at this time period because all of the house members tend to be active per day
and also the house may trap heat during the day and making the house warm in the afternoon, hence

requiring A/C to cool it down and also due to the use of artificial lighting

SPACE ANALYSIS Energy Audit E-Report

DAILY ENERGY USE PER SPACE Bedroom 3 has the highest daily
energy consumption because it
solely depends on mechanical
ventilation and artificial lighting for
daily activities due to the lack of
openings and it is situated in the
middle of the house

Bedroom 2 has the second highest
daily energy consumption since it
is highly exposed to direct sunlight
as there are 2 façade that face the
morning sun. The room heats up
really fast as the 2 exposed façade
have large windows with thin glass

Percentage of energy use per Spaces

Dinning room Living room Analysis
1.2% 5.5%
The kitchen's energy use is 40% higher during weekends since we
Kitchen Bedroom 3 tend spend more time in the kitchen cooking and baking. Also, the OVERVIEW
15.6% 29.3% use of oven for baking has a big impact for the kitchens energy use.
Bedroom 3 and and bedroom 2 has lower energy consumption Overall during the weekend we tend to have a higher
Bathroom during weekends since both space users tends to spend more time in energy consupmtion compared to the weekdays due
0.6% common spaces like kitchen and living room, hence increasing the to the fact that we spend more time at home during
energy consumption for these spaces weekends because of coronavirus.(The result would
Bedroom 1 The living room likewise has a higher energy use during weekends as be vice versa if there was no Covid-19 since we
18.9% we tend to spend more time watching tv. would spend more time away from home)

Bedroom 2
28.8%

EXISTING ENERGY PERFORMANCE Concrete Roof Energy Audit E-Report
EXISTING RENEWABLE ENERGY
U value of Concrete Roof

1mm White paint

The U-Value of the roof, 3.16W/m²K which is very high, compared to the recommended U-value for heavy 127mm Concrete Slab
weight roof which is 0.6W/m²K. This allows high thermal transfer into the spaces of the ground floor therefore
20mm Cement
increasing the usage of cooling system. Plaster

U value of Brick wall with cement plaster and paint

Brick wall The house is equipped with solar water heater which
is highly efficient .
The solar energy system that uses the sun to heat
domestic hot water. A solar water heater can
provide up to 80 percent of hot water needs, it
typically pays for itself in just four to eight years, and
can be expected to last for 40 years or more.

The U-Value of the wall, 2.68W/m²K which is lower than 2.7 W/m²K (150 mm wall with 125 mm bricks 12 mm Window panel
screed both sides) has proved that the walls in my home are energy efficient enough to reduce the amount of

heat transmittance.

U value of Glazed Window Panel

Glazing generally contributes high heat transmittance. Wall to window ratio is kept at medium levels therefore Issue:
contributing to the heat transmission by a high quantity. The window is directly
exposed to the sunrays
from 7am to 11am, since
there are no vegetation
or any other thing to filter

the sunradiation

ENERGY SYSTEM & ENERGY SAVING POTENTIAL Energy Audit E-Report

BUILDING FEATURES OCCUPANTS BEHAVIOR

SUN SHADING DEVICES USE LESS AIR CONDITIONER

Installing a sun shading device on the Prevailing Air conditioner has the highest energy consumption in
highlighted façade, will reduce heat gain for Wind the house, so by reducing its usage time by a little bit
bedroom 2 and hence it will keep the room can have a big impact on the monthly electricity bill.
cooler. The adjustable shading device will So, by opting for fan alongside open windows will help
reduce the air temperature inside, eliminating the use
also help to improve visual comfort. The
sun shading device will also allow air to of air conditioning at certain time period
enter the space enhancing cross ventilation
UNPLUG DEVICES WHEN NOT IN USE
Sun shading device to be installed
Unplug battery charges when the batteries are fully
ADD INSULATION TO ROOF charged or the charges are not in use. Many charges.
draw power continuously, even when the device is not
During the precedent analysis, the U-value of the roof is found to be 5 times higher
that the recommended U-value. So by adding insulation to the roof may significantly plugged into charger.
reduce its U-value hence reducing the heat gain of the interior spaces
WASH ONLY FULL LOAD OF CLOTHES
Concrete Slab Insulation Ceiling
According to the daily energy load profile my mother
The U-value dropped by almost 50% when the uses the washing machine daily to wash our clothes.
insulation is added By washing clothes on alternate days and washing the

LOW E-GLASS clothes only when it is full could be more energy
efficient and reduce the energy use of the washing
Low E-Glass has much lower U-value compare to single glass panel and has
better thermal insulation, preventing unwanted heat from coming into the machine by half.
home while allowing adequate amount of daylighting to the interior spaces.
The extra insulation lessens the reliance on ventilation appliances such as

ceiling fan and air conditioners, reduce energy costs.

ENERGY SYSTEM & ENERGY SAVING POTENTIAL Energy Audit E-Report

ELECTRICAL APPLIANCES WATER MANAGEMENT

INVERTOR REFRIGERATOR Existing Refrigerator New refrigerator Water Usage Calculation
0.350 kW 0.150 kW
The refrigerator is the second highest Water bill for 30 Days
energy consumption appliances in the Consumption Rate = 17m3
house. So by switching to a more efficient Average Daily Consumption per person
refrigerator may have an big impact on the
monthly energy consumption. 17m3 * 1000
=
The best energy efficient refrigerator can be
easily identified by energy-star label. 30 days * 4 person
= 141.6 Liters Per Person/ day
DIMMER AND MOTION DETECTOR
CO2 EMISSION
Motion-sensor switches can be installed at
corridor and family area which are always Electricity usage - 460.816 Kgco2 Transport usage - 184.99 Kgco2 Water usage - 71.23 Kgco2

kept on even though there are no Total CO2 Emission is 0.72 Tonne Co2
occupants, if can reduce electricity it takes 18.4 trees to be planted in order to absorb my total CO2 emission in a month
consumption and the cost of electricity to a

home by 35-45 percent.

LIGHTING EFFICIENCY Existing Light bulb LED Light bulb
0.0025 kW 0.015 kW
Replacing Fluorescent tube and light bulb to LED lightbulb.
The LED light bulb is more energy efficient

LED light uses far less energy (watt) to produce the same light
output (lumen). An example: a LED bulb uses only 2.5 watts to
produce a light output of 115 lumen, while a traditional bulb
uses 15 watts (or 6 times more energy!) to produce the same

lumen output.

REFERENCES Energy Audit E-Report

Climate - Mauritius. Mauritius climate: average weather, temperature, precipitation, when to go. (n.d.).
https://www.climatestotravel.com/climate/mauritius.
Ritchie, H. (n.d.). Energy Production and Consumption. Our World in Data.
https://ourworldindata.org/energy-production-consumption.
Home. Home - Energy Savings Systems. (n.d.).
http://energysavingssystems.com/.
3 Main Benefits of Low E Windows. Harvey Windows & Doors. (n.d.).
https://www.harveywindows.com/inspiration/ideas-advice/3-main-benefits-of-low-e-windows-harvey-windows-doors.
Carbon Calculator
https://carbonneutral.com.au/carbon-calculator/