NET ZERO HOUSE
Etienne Hentzen
Mark Horgan
Mark Lewis
Grant MacGregor
Darren Tannock
RECAP
 Geometry finalised
 Natural / artificial lighting
analysis
 Heating load
 Electrical demand (incl.
car)
 Wind turbine selection
 Solar panel selection
GANTT CHART
VENTILATION SYSTEM
 Ventilation requirement
 For comfort
 Perceived indoor air quality : Category C
 30% dissatisfied / 2,5 decipol
 0% smoker  1 olf/occupant
 Occupancy in space= 0,022 occupants/(m² floor)
 Pollution load causing by the building
= 0,05 olf/(m²floor)
 Ventilation effectiveness = 1
 Ventilation requirement
 For comfort
VENTILATION SYSTEM
 Ventilation requirement
 From the building regulation 2010
 Minimum dwelling ventilation rate = 0,3x floor area
In our case :
0,3x180= 54 l/s= 194,4 m^3/h
 We use this value to design our ventilation system
 Use of a heat and recovery system
 Supply ventilation rates
VENTILATION SYSTEM
 Extract ventilation rates
 Use of a cooker hood suitable for the heat recovery unit
VENTILATION SYSTEM
VENTILATION SYSTEM
 HR unit: Ubbink HR G400
 Data
 Control:
 Manually with a 3-way switch
 Automatically with a remote control
HOME ENERGY MANAGEMENT
 GEO Ensemble Energy Monitor.
 Easy management of home electricity consumption as well
as controlling home appliances.
(image source:http://www.greenenergyoptions.co.uk/wpcontent/uploads/2013/01/06-Ensemble-Front-Back.png)
HOME ENERGY MANAGEMENT
 Smart plugs enable user to control appliances with the touch of a
button.
 Energy consumption displayed in real-time.
 Consumption information shown in terms of cost, energy units (kWh)
and CO2 produced.
(image source:http://ecx.imagesamazon.com/images/I/310TkxPAb8L._SS270_.jpg)
(image source:http://www.greenenergyoptions.co.uk/wpcontent/uploads/2012/09/02_Solo_I_PV.png)
WATER USAGE
 Standard water use was calculated using South Staffs Water factsheet.
 This value of 160l per day per person is much greater than values
specified in the Code for Sustainable Homes.
Standard Water
Use
Shower
Litres per
use
Use for 1 person Use for 4 people
per day
per Day
Use for 4 people
Hot Water Litres
per week
Litres Per Week Per Week
45
1
4
28
1260
1260
Toilet
6
5
20
140
840
0
Teeth
6
2
8
56
336
0
Hand/Face
2
4
16
112
224
224
Washing Machine
85
0
0
3
255
255
Dishwasher
42
1
4
28
1176
1176
Food Prep
15
1
2
14
210
210
Car Wash
35
0
0
0.5
17.5
0
Gardening
500
0
0
0.3
150
0
25
0
4493.5
3125
160.5
111.6
Miscellaneous
Total
Daily Average Per
Person
ECONOMIC WATER USE
 Using Restricted taps and low flow taps results in a saving of 50.6%.
 Using Rainwater Harvesting results in a total saving of 65.8% water.
 This means the water usage is lowered to less than 80l per person per day, scoring maximum points
according to the code for sustainable homes.
Low Water Use
Shower (restricted
Nozzle)
Use for 1 person per Use for 4 people Use for 4 people per
Hot Water Litres Per Mains Water Use
Litres per use day
per Day
week
Litres Per Week Week
per week
31.5
1
4
28
882
882
882
Toilet Full Flush
4
2
8
56
224
0
0
Toilet Half Flush
Teeth (aerated
tap)
Hand/Face
(aerated tap)
Bosch
WAQ28461GB
Zanussi
ZDT12002FA
Food Prep
(aerated tap)
2
3
12
84
168
0
0
1.8
2
8
56
100.8
100.8
100.8
0.6
4
16
112
67.2
67.2
67.2
40
0
0
3
120
120
0
14.3
1
4
28
400.4
400.4
400.4
4.5
1
2
14
63
63
63
Car Wash
35
0
0
0.5
17.5
0
0
Gardening
500
0
0
0.3
150
0
0
25
0
25
2217.9
1633.4
1538.4
79.2
58.3
54.9
Miscellaneous
Total
Daily Average Per
Person
RAINWATER HARVESTING
 The system specified is the F-Line Diver 7500 from Rewatec
 Using the system we save 65.8% on mains water.
 The capture area is specified as the roof space, so 180m2 at 80% collection.
Month
Rainfall (mm)
In (L)
Out (L)
Left in Tank (L)
January
60
8640
3118
5522
February
40
5760
3118
2642
March
40
5760
3118
2642
April
20
2880
3118
-238
May
20
2880
3118
-238
June
20
2880
3118
-238
July
20
2880
3118
-238
August
40
5760
3118
2642
September
30
4320
3118
1202
October
50
7200
3118
4082
November
40
5760
3118
2642
December
30
4320
3118
1202
410
59040
37416
21624
Total
RAINWATER HARVESTING
ACTIVE-OX CHLORIDE DIOXIDE DOSING
SYSTEM
 Kills Legionella and other harmful biological agents
 Allows for reduction of water storage temperature to only 50˚C,
instead of <60˚C temperatures conventionally required
 Dramatically reduce hot water heating load, as tap water output of only
45˚C necessary
WATER TREATMENT - UV DOSING
 IWE-SS75- Max flow rate of 60 L/min
 75 Watts lamp power
THERMAFLOW COMBI-BOILER
 99% efficient electric boiler
 Input valve allows for input of
solar thermally-collected
water
 TH12-330U MRK 2
 £2,533.39
 12 kW
 330L
SOLAR THERMAL COLLECTOR
 Data for 10 different Thermal Collectors was gathered; 5 Evacuated
Tube, 5 Flat Plate. [http://www.solarenergy.ch/index.php?id=111&L=6&no_cache=1]
 Evacuated tube collectors seemed to have a higher efficiency on
average.
 These were evaluated using the equation from AES Solar:
2

 






1
1

Qs  K p S t A 0.87  0.034   0.0006   0 

 0 
  0   

 The Enertech Enersol HP65-30 proved to be the best choice.
 One panel system provides 2246kWh/year
SOLAR THERMAL COLLECTOR-CALCS
Q (kWh) AES
Q (kWh/day)
Q (kWh/h)
E (J)
Tw,in
Tw,out
January
71.90410228
2.31948717
0.257720797
9277948.681
10
19.23951
February
123.2764478
4.402730277
0.489192253
17610921.11
10
27.53796
March
189.7469366
6.120868922
0.680096547
24483475.69
10
34.38205
April
248.0562668
8.268542228
0.918726914
33074168.91
10
42.93715
May
302.2635411
9.750436809
1.083381868
39001747.23
10
48.84017
June
281.5599704
9.385332347
1.042814705
37541329.39
10
47.3858
July
275.6323921
8.891367486
0.987929721
35565469.94
10
45.41813
August
262.9825963
8.483309558
0.942589951
33933238.23
10
43.79266
September
210.6867513
7.02289171
0.780321301
28091566.84
10
37.97519
145.139762
4.681927807
0.520214201
18727711.23
10
28.65013
November
84.40356092
2.813452031
0.312605781
11253808.12
10
21.20719
December
50.59918309
1.632231712
0.181359079
6528926.85
10
16.50188
Total
2246.251511
October
HEAT LOAD INCLUDING 12HR LAG
3.00
2.00
1.00
0.00
1
-1.00
-2.00
-3.00
-4.00
-5.00
-6.00
-7.00
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sept
Oct
Nov
Dec
BOILER LOAD
Total Collection
HOT WATER
REQUIREMENTS
No. Litres Heated
HEATING
REQUIREMENT TOTAL LOAD
Litres Req /
Monthly Heating (Heat+ Hot
1 Collector 2 Collectors 1 Collector 2 Collectors Litres Req/ Day Month
Energy Req. Load
Water)
Month
(kWh)
(kWh)
(L)
(L)
(L)
(L)
(kWh)
(kWh)
(kWh)
JAN
71.90
143.80
1546.61
3093.21
233.40
7235.40
336.37
836.34
1172.71
FEB
123.20
246.40
2650.10
5300.19
233.40
6535.20
303.81
551.34
855.15
MAR
189.70
379.40
4080.54
8161.09
233.40
7235.40
336.37
527.00
863.37
APR
248.00
496.00
5334.61
10669.22
233.40
7002.00
325.52
301.24
626.76
MAY
302.20
604.40
6500.48
13000.96
233.40
7235.40
336.37
132.10
468.47
JUN
281.50
563.00
6055.21
12110.42
233.40
7002.00
325.52
116.23
441.75
JUL
275.60
551.20
5928.30
11856.60
233.40
7235.40
336.37
44.13
380.50
AUG
262.90
525.80
5655.11
11310.23
233.40
7235.40
336.37
59.06
395.43
SEPT
210.60
421.20
4530.11
9060.23
233.40
7002.00
325.52
109.67
435.19
OCT
145.10
290.20
3121.18
6242.35
233.40
7235.40
336.37
225.44
561.81
NOV
84.40
168.80
1815.49
3630.98
233.40
7002.00
325.52
493.13
818.65
DEC
50.50
101.00
1086.28
2172.56
233.40
7002.00
325.52
644.28
969.80
2245.60
4491.20
48304.02
96608.03
84957.60
3949.58
4039.96
7989.54
TOTAL
BOILER LOAD
Boiler Load [(total-STC input)/Efficiency]
Electricity Cost
Annual Saving over 0 Col
1 Collector
2 Collectors
0 Col
1 Col
2 Col
1 Col
2 Col
(kWh)
(kWh)
(£)
(£)
(£)
(£)
(£)
1111.92
1039.30
159.91
151.63
141.72
8.29
18.19
739.35
614.90
116.61
100.82
83.85
15.79
32.76
680.47
488.85
117.73
92.79
66.66
24.94
51.07
382.58
132.08
85.47
52.17
18.01
33.30
67.46
167.95
-137.31
63.88
22.90
-18.72
40.98
63.88
161.86
-122.48
60.24
22.07
-16.70
38.17
60.24
105.96
-172.43
51.89
14.45
-23.51
37.44
51.89
133.86
-131.69
53.92
18.25
-17.96
35.67
53.92
226.85
14.13
59.34
30.93
1.93
28.41
57.42
420.91
274.35
76.61
57.40
37.41
19.21
39.20
741.66
656.41
111.63
101.14
89.51
10.50
22.12
928.58
877.57
132.24
126.62
119.67
5.62
12.58
5801.96
3533.68
1089.48
791.18
558.76
298.31
530.72
BOILER LOAD
Payback Time
(£5000 per collector)
1 Col
2 Col
(Years)
(Years)
16.76
18.84
EXCESS HEAT WASTED
Average Boiler Load/ Day (kWh)
1 Col
2 Col
JAN
35.86854698
FEB
26.40527369
MAR
21.95065841
APR
12.75270034
MAY
5.41758575
JUN
5.395461279
JUL
3.417911589
AUG
4.318204844
SEPT
7.561791246
OCT
13.57789856
NOV
24.72206061
DEC
29.95422613
AVERAGE
15.94519328
33.52576431
21.96082924
15.76949191
4.402531987
0
0
0
0
0.470882155
8.84997415
21.88030976
28.308739
11.26404354
SOLAR THERMAL COLLECTORS
 Select 2x Enertech Enersol HP 65-30 Solar thermal
collectors
HEATING DISTRIBUTION
 Underfloor Wet Heating system
 More efficient than Electric UHS
 Lower distribution heat
requirement compared to
localised wet-flow radiators
 Floor heating input = 24-29C,
significantly cooler than boiler output
 Generally 200mm spacing between
pipes
HEATING DISTRIBUTION
BATTERY STORAGE
 It was decided that the family required two days off grid storage.
 8 different batteries were compared for storage capacities, including Gel
and AGM batteries.
 Overall it was determined that the Raylite M-SOLAR 48V 1380Ah
battery had the greatest capacity.
 The main drawback with these batteries is that the weigh a lot (1524kg),
and the require a constant 23-27°C temperature for optimum output.
BATTERY USE PER MONTH
 The average number of required batteries is 0.7
Raylite MSolar 48V
1380Ah
Electrical Load
(kWh)
January
February March
April
May
June
July
August
September
October November December
7.62
7.62
7.62
7.62
7.62
7.62
7.62
7.62
7.62
7.62
7.62
7.62
Boiler Load
(kWh)
33.53
21.96
15.77
4.4
0
0
0
0
0.47
8.85
21.88
28.31
Total Load
(kWh)
41.15
29.58
23.39
12.02
7.62
7.62
7.62
7.62
8.09
16.47
29.5
35.93
2
2
2
2
2
2
2
2
2
2
2
2
66.24
66.24
66.24
66.24
66.24
66.24
66.24
66.24
66.24
66.24
66.24
66.24
52.992
52.992
52.992
52.992
52.992
52.992
52.992
52.992
52.992
52.992
52.992
52.992
1.55
1.11
0.88
0.45
0.28
0.28
0.28
0.28
0.30
0.62
1.11
1.35
Days of
Storage
Required
Battery
capacity (kWh)
Battery
capacity at
80% DOD
(kWh)
No. Of
Batteries
Required
THANK YOU FOR LISTENING
 ANY QUESTIONS?