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5
8. Case study coverage
•Customer details
•Auditor checklist
•Utility accounts
•Building property
•Energy & Water service
•Energy & Water improvement measures
•Other recommendations (behavioural changes &
thermal performance, message from assessor, etc.)
8
9. Figure 1 Google map of the property Figure 2 Front view of the property
Assessor name: Roger Example
Customer: The property owner is Joe Bloggs
Address: 42 Example St, West End QLD 4101 (inner city)
Customer Name: Joe Bloggs
Customer Contact number: 07 3333 4444
Email: joe@email.com
Assessment date on site: 3 /10 /2011.
Audit number: S02-001
Your auditor number: S02 (shown in an audit number)
9
11. AUDITOR ASSESSMENT CHECK LIST
• You have assessed the property for
potential Solar PV/Solar Hot Water;
assessment of appropriate roof space,
possible shading, roof orientation,
switchboard etc.
• You entered the property at 9:10 am
and completed the audit at 10:45 am.
• The client is clear about the necessity/
purpose of a home assessment and
ready to provide any information
required .
• The necessary equipment required for
the audit is on site.
• You met the client at the property. The
client has been notified of any issues,
programs, assistance, rebates involved
(State, territory, industrial relations).
• All the Information (water, electricity
bills etc.) required for the audit is
gathered from the client
• Number of occupants: 6 people (45
year old male, 40 year old female, 2
male 2 female kids)
11
12. BUILDING
• Building Size: approx. 200 sq.m.
• Building Type: free standing dwelling
house, single storey, average 2.8 meter
ceiling height. Originally built in 2000. No
refurbishment.
• You have double checked the number
of rooms in the building and confirmed
that there are 6 bedrooms, 1 living area,
1 kitchen, 3 bathroom, 1 water closet.
• Home weekdays: yes the customer is
often home on weekdays.
• The customer advised the temperature
is good in winter and breezy and cool in
summer.
12
13. ELECTRICAL / POWER
• Solar: There is no solar power
installed however the customer is
keen to install a 1.5 kW system.
• You estimate a total installation
cost of $2,990 and advise the
customer to connect to a net feed-
in tariff ($0.44/kWh in QLD).
• For a tariff which might not be
readable on the switchboard, refer
to the energy bills.
• Metering: The customer wishes to
install Web Metering on sub circuits
if they can monitor energy use and
save on energy bills.
14. AUDITOR ASSESSMENT CHECK LIST
• The property has two dogs in the
cage outside which could be a risk
to you when performing a job. You
informed the home owner not to let
dogs out.
• You have double checked the
number of rooms in the building and
confirmed that there are 6 bedrooms,
1 living area, 1 kitchen, 3 bathroom, 1
water closet.
• You have also confirmed that the
laundry room and swimming pool are
located outside the building but
under the same property.
• You have obtained a Google map
(Fig. 1) to determine the property
orientation for potential solar hot
water or solar PV installation.
Figure 1 Google map of the
property
14
19. ACCOUNTS
GAS ACCOUNT
LPG: 2 x 13.5 kg LPG bottles found outside the house. Customer advised
that they use a total 3 bottles per year (one bottle replaced per year)
Householder has not kept the gas bills but estimated an expense of $216
per year for all 3 bottles.
Figure 29. 2x 13.5 kg LPG gas bottles
19
23. SOLAR PHOTOVOLTAIC
• The longest part of the roof is east facing.
However, there is suitable space facing
north to install 1.5 kW solar panels.
• There is shading within 40 and 60 degrees of
north which would lead to some shading in
the afternoon.
• The roof pitch is 30 degrees
BUILDING INSULATION
• The customer claims that there is 100%
reflective foil (sarking) insulation for the
entire house.
• Ceiling insulation in the lounge only,
accounting for approximately 30% of the
house. Additional ceiling insulation can be
installed in the ceiling area, costing around
$12-20/sqm.
• The insulation type is Wool Batt with a rating
of R2.5
• The customer advises you the thermal
comfort of the property is cold in the winter
and good in summer.
23
24. HOT WATER HEATER
• 315 litre electric storage hot water system on Off Peak Use Tariff
(see Fig.4)
• The customer is interested in solar electric hot water and is
interested in the current solar hot water rebates. Total
installation cost of is $5,699 and customer will pay $3,137 after
STC discount ($962), Federal ($1,000) and QLD rebates ($600).
• There is no insulation on pipework. This cost $100 to insulate the
hot water pipes.
• The water temperature, when tested at an untempered point
is 60 degrees C
Figure 4 Hot Water System
24
25. WATER USE
• No rainwater tank, bore or grey
water used.
• Garden and trees have medium
water demand.
• The irrigation method is a hose.
Garden watering – 5mins/day, 5
days/week, 26 weeks/year.
• Home owner is keen to install a
4000 litre rainwater tank to top up
pool and provide water for
gardening. You have contacted
some rainwater tank suppliers
and estimated up to an
installation cost of $1,000
25
26. POOL AND SPA BATH
• There is a 50,000L pool (See Fig. 5). There is no spa.
• Pool Filter (see Fig. 6) has a 1kW single speed pump which runs 8 hours a
day in summer, winter, autumn and spring. The pool pump is on Tariff
11.
• The customer is concerned that the pool pump may have consumed a Figure 5 - 50,000 litre pool
lot of electricity so he is considering connecting the pool to cheaper
tariff.
• The customer is interested in replacing a single speed pump with a new
3 speed pump and a pump timer to cut down energy use for the pool.
The pipe diameter is 50mm.
• The ideal runtime for the pump if a timer is used would be 8 hrs in
summer, 4 hrs in winter, 6 hrs in autumn, and 6 hours in spring. You
estimated $1,200 for a 3 speed pool pump and $300 for an additional
pool timer.
Figure 6 Pool Filter
• The top up water source is potable water.
• Backwash – 20 times a year.
• No pool blanket is used. A pool cover is highly recommended.
26
27. Figure 5 - 50,000 litre pool
Figure 6 Pool Filter
27
28. LOUNGE
• Floor area of 55 m2. Large window facing south. There is ceiling
insulation as aforementioned.
• No zoning or draft proofing. An entry door has a large gap and
can be sealed, costing $20/ door seal.
• Large clear glass door can be tinted to reduce heat gain
through glass door.
• 8 x 62 W (this includes 12 watt ballast) MR16 halogen downlights
Figure 8 2xMR16
used for 30 hrs a week in the lounge 52 weeks (see Fig. 7)
halogen bulbs in the
hallway
• 2 x 62 W MR16 halogen downlights used for 6 hours per day in
the hallway, 7days a week for 40 weeks (see Fig.8)
• 2 x 62 W MR16 halogen down lights left on 4 hours per day near
the outdoor area,7 days a week for 52 weeks (see Fig.9).
• There is the potential for the customer to replace all MR16
halogen fittings with 10W LED fittings.
Figure 9 3 x MR16 halogen
bulbs near an outdoor area
Figure 7 8 x MR16 halogen bulbs in the lounge 28
29. LOUNGE
• See Fig. 10 for entertainment appliances. Kids use them 5 hours/day, 7 days/
week, and always leave them in passive standby when not in use. Standby
power is 8 watt when measured with Powermate meter. Power
management can switch off standby energy from all entertainment
appliance off at the wall costing $30 to buy.
• Two Laptops are used 6 hours/day everyday and no power management
(hibernation) is activated and the laptops are rarely powered down when
not in use.
• He was not aware where to place electronic waste and Last year, Joe
disposed his old TV and old telephone and 3 CFLs in the recycle bin.
Figure 9 3 x MR16 halogen Figure 10 Plasma TV, 2 laptops, xbox, and DVD player
bulbs near an outdoor area
29
30. LOUNGE
• The air conditioner is a ducted reverse
cycle non-inverter system supplying
the kitchen area, lounge, and all
three bedrooms. It is 5 years old and is
on standard primary tariff. (See Fig. 11
for air conditioning specifications
• There are 2 zones;
• Zone 1: for lounge and kitchen,
• Zone 2: for all 3 bedrooms.
• The air conditioning is used for 10
weeks in summer 5 hours/day, 7 days/
week, and about 5 hours per week for
13 weeks when it is only stuffy and hot
in autumn & spring
Cooling Heating
Output (kW) 16 18
Input (kW) 6 5.14
EER/COP 2.67 3.5 Figure 11 three phase reverse cycle
air conditioner
31. BEDROOM 1
• Floor area of 12 m2. Southern window allows direct
solar gain to the room.
• 2 x 62 W MR16 halogen down lights on for 6 hours per
day, 7 days a week, 52 weeks per year. The customer
indicates that although the lights are on for 6 hours per
day the room is only used for about 3 hours per day.
• The customer also wants to replace bedroom MR16
Figure 13 LCD desktop and
halogen fittings with 10W LED fittings. laser printer in the Bedroom
•The ducted AC system supplies cooling to the bedroom (Zone 2) and is used in
summer only, 5 hours/day, 4 days/ week for 13 weeks
•There is one ceiling fan. It is sometimes in use for 3 hours, 2 days/week, 13 weeks in
summer only.
•There is a computer used for 5 hours 6 days a week for 45 weeks (Figure 13), with one
printer attached. The computer is usually left on standby (5 watt standby when
measured with Powermate) rarely turn off at the wall. You recommend another
power management at $30.
31
32. BEDROOM 2,3,4,5,6
Area:
•Bedroom 2: 16 sq.m.
•Bedroom 3 &4: 14 sq.m.
•Bedroom 5: 20 sq.m.
•Bedroom 6: 16 sq.m.
Figure 12 2x MR16 halogen bulbs and ceiling fan in the Bedroom 1
Lighting
•Each bedroom has 2 x 62 W MR16 halogen down lights, use for 5 hours per day, 7
days a week, 52 weeks per year.
•The customer also wants to replace bedroom MR16 halogen fittings with 10W LED
fittings.
•Air conditioner:
•The ducted AC system supplies cooling to the bedrooms (Zone 2) and is used in
summer only, 5 hours/day, 4 days/ week for 13 weeks.
•There is one ceiling fan in bedroom 2,3,4. It is sometimes in use for 3 hours, 4
days/week, 13 weeks in summer only.
•There is a laptop in each room the customer estimated children use around 4 hours
5 days a week for 45 weeks. Laptops have no active power management setting and
is powered off after use.
32
33. KITCHEN
• Floor area: 18 sq.m. No direct solar gain.
• Lighting: 2x 15w CFLs (see Fig.14), used 7 hours
a day, everyday for 50 weeks.
• AC system: same usage as in the lounge. Figure 14 2x CFLs in the kitchen
• Gas cooktop: use once a day, 11 times/week,
50 weeks per year for 20 mins on average. Only
1 main burner is used during cooking (see Fig
15).
• Rangehood light is integrated with an
exhausted fan and operated during cooking.
• Electric oven: on average 6 hours a week, for
40 weeks. Figure 15 Cooktop, oven, and rangehood
33
34. KITCHEN
• Microwave: use 8 mins a day, 5 days/week, for 52 weeks (see Fig 16).
• Kettle: boil a full kettle twice a day, 6 days a week (see Fig 16).
• Toaster: use twice a day 6 days/week
• Dishwasher: 13 place settings, used once a day 7 days/week, 48 weeks per
year. There is a hot water connection to the dishwasher and it is on Tariff 11(Fig
17).
• Sink dishwashing twice a week for 40 weeks, no pre-rinsing.
• Kitchen Tap: when measured, it takes 7 seconds to fill up one liter container.
Figure 16 Microwave, kettle Figure 17Dishwasher
34
35. • There is one fridge in the
kitchen area.
• Seals are in good
condition and on primary
tariff.
• It is 5 years old (Fig. 18 for
specifications).
Figure 18 Refrigerator in the kitchen
35
36. KITCHEN
• Joe and family place your kitchen waste into the a container used as
fertiliser (Fig. 19).
• The family has one, typical 240Lwaste bin and 1 recycling bin. Every
week, Joe notices that the waste bin is always full and the recycling
bin is 75% full on a collection day.
• The family is always sure to take a carry bag for shopping.
Figure 19 Food Composting
36
37. Bathroom 1,2,3 & water closet
Figure 20 Bathroom 1 bathroom
Area
•Bathroom 1: 7 sq.m.
•Bathroom 2: 8 sq.m.
•Bathroom 3: 4 sq.m
•Water Closet: 2 sq.m
Lighting
Bathroom 1,2,3
•The integrated 1 x 75W incandescent light and exhaust fan fitting in the bathroom is used
for 1 hour/day everyday. The incandescent could be replaced with 15w CFL.
•The 2x 275W tastic lamps are used for 1 hour a day, 7 days a week for 20 weeks in the
colder months. These are often left on unnecessarily causing wasted energy.
•Water closet: 32 w circular fluorescent, 4 hours per week
37
38. Bathroom 1,2,3 & water closet
Water use
•3 shower booths, 2 basin sinks, 3 toilets (see floor plan).
•Shower 1: twice a week, 48 weeks, 4 people, 7 mins each time
•Shower 2: twice a week, 48 weeks, one person, 7 mins each time
•Shower 3: twice a week, 48 weeks, one person, 7 mins each time
Note:
•The water used for shower, sink and bath is mains supply potable water
•The bathroom taps, when measured with a cup indicates 0.8 liters in 4.5 secs.
•The shower, when measured with a cup indicates 1 liter in 6.5 secs.
•A standard sized bath in bathroom 1 is used approximately once a week for 10
weeks per year at full capacity.
Figure 21 Water Closet – toilet and light bulb
38
39. LAUNDRY ROOM
Figure 23 Clothes Washer
(3.5 Energy rating, 67kWh cold wash, 311 kWh
hot wash, 4 star WELS, 72 L)
Laundry Room
•Area: 4.5 sq.m.
•1 x 20 W CFL, 2 hours/week
•8 kg clothes washer (Fig.23) is used 5 times a week with warm water (40 C) for 50 weeks.
– 3.5 energy rating (67 kWh cold wash and 311 kWh hot wash)
– 4 star water rating (77 Liters/wash)
– Clothes washer on a standard tariff
– One high flow laundry tap, when measured with a cup indicates 1 liter in 3.5 secs. It is
used 3 times a week for 15 mins. The customer would also like to upgrade to a more
water efficient tap in order to save water.
39
40. LAUNDRY AREA
• Laundry area is outside laundry room
• The water used for a old sink and washing machine is mains
potable water measured at 4.5 secs per litre. The customer would
also like to upgrade to a more water efficient tap in order to save
water.
• You recommended an 4 star water efficient tap ($90) to reduce
wasteful water use.
• Lighting:1 x 20w fluorescent and 3 x 62w halogen globes used
approximately 2 hours a day, 5 days a week for 50 weeks (see
Fig.22). The customer would like to replace the MR16 halogen
fittings with 10W LED fittings.
Figure 22 2ft fluorescent
and 3 x MR16 halogen
bulbs
40
41. LAUNDRY AREA
Figure 24 5kg clothes dryers
• Clothes dryer (Fig 24): 5kg clothes dryer with a timer,
heavily used about 7 times a week for 45 weeks and on
the standard tariff.
41
42. OUTDOOR/ GARAGE
• Lighting:
• 1x 23W paraflood CFL globe, and 1x 150w paraflood
globe left on 5 hour a day, 7 days a week for 50 weeks
(see Fig. 25)
• 4x 32w circular CFLs, 2 x 62wMR16 halogen bulbs left on 5
hour a day, 7 days a week for 50 weeks (see Fig. 26)
Figure 25 Left-PAR 38, Right-CFL Par38 Figure 26 Outdoor lights
(4x 32wcircular CFLs, 2 62wMR16 halogen bulbs)
42
43. TRANSPORT
• Joe lives 5 kms away from his
workplace and takes the bus 5
days/week, approximately 50kms per
week, total 250 kms all family members
(per week).
• All family members commute by a
small car (E10) at weekends
approximately 200 kms/week, 52
weeks.
• During conversation between you
(assessor) and Joe (property owner),
you discuss the possibility of
behavioural alterations to reduce
energy use in his property, as follows.
43
44. BEHAVIOURAL
During conversation between you
(assessor) and Joe (property owner), you
discuss the possibility of behavioural
alterations to reduce energy use in his
property, as follows.
Lighting
• Reduce hours of exterior lighting
overnight when not needed – saving
99 kWh p.a.
• Switch off some internal lights in living
area & kitchen and open the curtain
to take advantage of natural light –
estimated saving 330 kWh savings
p.a.
Admin Energy
• Switch off office & entertainment devices
at the wall after use – estimated saving
80kWh p.a
Climate Control
• Increase the ducted air conditioner temperature setting from 23°C to 24°C for the
whole house in summer – saving 222 kWh p.a. (based on a 10% reduction in air
conditioning energy use per 1°C reduction)
44
45. BEHAVIOURAL
Food Preparation
• Avoid cooking several small meals and instead, allow family members
to prepare meals together – reducing total food preparation energy in
oven and cooktop by 309kWh p.a.
Showerhead
• Reduce your current shower time from 7 mins to 4 mins to save water –
estimated saving of 18 kL p.a.
Washing Machine
Use washing machine at full load to avoid unnecessary washes – estimated
saving of 4 kL p.a.
Note: calculate energy & water saving can be calculated by using the
formulas below.
• Energy (kWh)= Power (kW) x usage reduction(hours reduction p.a.)
• Energy (kWh)= Power reduction (kW reduction) x usage reduction
(hours p.a.)
• Water (kL)= Water flow reduction (L/min) x Total mins p.a. (1 kL/1000L)
• Water (kL)= Water (L/min) x Total mins reduction p.a. (1 kL/1000L)
45
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