Compact units field test - IEA Heat Pump Programme

Evaluation of
system performance
by field test results
Bernd Hafner
Viessmann Werke, Allendorf (Eder)
IEA Annex 28
Las Vegas 2005
Page 1
Vitotres 343
Technical Data
Dimensions 200 x 60 x 68 cm
DHW storage tank 250 l
Prepared for solar collectors
Ventilation heat recovery
Air flow rate 70 to 250 m³/h
Exhaust air heat-pump 1,5 kW
with additional ambient air
Electric heater 6 kW
Hydraulic heating circuit
Active cooling
IEA Annex 28
Las Vegas 2005
Page 2
Passive House
Field test Vitotres 343
Herzhausen
Lightweight construction
Surface 180 m²
Volume 450 m³
Ground heat exchanger 2 x 30 m
Heating demand 14,1 kWh/m²
Vacuum tube collector 3 m²
IEA Annex 28
Las Vegas 2005
Page 3
Passive House
Field test Vitotres 343; Giessen
Standard
construction
Surface 70 to 120
m² per flat
Flat plate solar
collector (approx.
10 m²) for 3 flats
Heating demand 15
kWh/m²
IEA Annex 28
Las Vegas 2005
Page 4
Energy consumption for
house heating and hot water
Energy in kWh/(m²a)
40
30
20
Energy delivered by
compact unit
Giessen 2
Herzhausen
PHPP
10
Preliminary results
0
IEA Annex 28
Las Vegas 2005
Page 5
Seasonal Performance of HP
3,5
Evaluation without
heat recovery
Seasonal Performance Factor
3
2,5
2
1,5
Giessen 2
Herzhausen
1
Preliminary results
0,5
0
IEA Annex 28
Las Vegas 2005
Page 6
Electric consumption
Herzhausen
Giessen 2
9,5%
11,8%
1,3%
2,7%
9,1%
16,4%
internal pump
solar pump
el. heater
heat pump
internal pump
solar pump
el. heater
heat pump
69,1%
80,1%
Preliminary results
IEA Annex 28
Las Vegas 2005
Page 7
Heat delivered
Giessen 2
Herzhausen
8,8%
7,9%
28,6%
solar
el. heater
heat pump
solar
el. heater
heat pump
3,1%
68,3%
83,3%
Preliminary results
IEA Annex 28
Las Vegas 2005
Page 8
Conclusion and Outlook
• Data show a good behaviour of the system
• Hydraulic scheme applicable for small
systems with fsolar= 50 %
• Control strategy applicable for other solar
systems
IEA Annex 28
Las Vegas 2005
Page 9