This document contains the results of an annual simulation of a Vaillant solar system for a single family home. It shows that: - In April, the solar contribution provided 99% of the total energy consumption and the solar fraction for domestic hot water was 100%. - Over the course of the year, the solar system is estimated to have provided 11,820,403 Btu of energy and avoided 2,370 kg of CO2 emissions.

2. Vaillant Solar Systems
Simulation by SB
Electricity DHW Single Family
CLAM- 22April10
Solar Energy Consumption as Percentage of Total Consumption
320,000
300,000
280,000
260,000
240,000
220,000
[ Btu ] per week
200,000
180,000
160,000
140,000
120,000
100,000
80,000
60,000
40,000
20,000
0
Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Solar Contribution 11,820,403 Btu Total Energy Consumption 12,547,424 Btu
Vaillant Solar Systems
Simulation by SB
Daily Maximum Collector Temperature
Electricity DHW Single Family
CLAM- 22April10
320
300
280
Space Heating Loop 260
(
High Temp Heating Loop: 240
Flow Temperature: 54.7 °C
Return Temperature: 49.17 °C 220
[ °F ]
..
200
Low Temp Heating Loop:
Flow Temperature: 43.65 °C 180
Return Temperature: 35.36 °C
.,
160
Distribution to Heating Loops: 140
Percentage of HT Loop when split amongst loops: 0%
120
100
80
Results of Annual Simulation
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Electricity Savings in MJ
12,810 1,122 990 1,257 1,188 1,108 952 1,055 1,060 985 1,086 1,034 972
CO2 Emissions Avoided in kg These calculations were carried out by T*SOL Pro 4.5 - the Simulation Programme for Solar
2,370 208 183 233 220 205 176 195 196 182 201 191 180 Thermal Heating Systems. The results are determined by a mathematical model calculation with
variable time steps of up to 6 minutes. Actual yields can deviate from these values due to
Total Solar Fraction in %
fluctuations in climate, consumption and other factors.The system schematic diagram above does
94 84 85 99 99 100 100 100 100 100 100 91 77
not represent and cannot replace a full technical drawing of the solar system.
DHW Solar Fraction in %
96 85 86 100 99 100 100 100 100 100 100 93 79
Heating Solar Fraction in %
86 82 82 99 100 100 101 0.0 0.0 0.0 99 85 75
T*SOL Pro 4.5 Page 3 4/22/2010
System Efficiency in %
22 31 27 25 22 20 17 18 18 17 20 27 31
Solar Contribution to DHW in MJ
10,436 655 713 930 960 962 896 1,024 1,028 956 949 795 568
Solar Contribution to Heating in MJ
1,990 434 247 290 192 112 27 0.0 0.0 0.0 105 208 374
Boiler Energy to DHW in MJ
449 116 113 4 7 0.0 0.0 0.0 0.0 0.0 0.0 60 149
Boiler Energy to Heating in MJ
315 93 55 3 0.2 0.3 -0.2 0.0 0.0 0.0 0.5 36 126
Energy: Aux Heating in MJ
764 209 168 7 8 0.3 -0.2 0.0 0.0 0.0 0.5 96 276
Energy Supply to Solar System in MJ
12,426 1,089 960 1,220 1,152 1,074 923 1,024 1,028 956 1,054 1,003 943
T*SOL Pro 4.5 Page 12 5/11/2010