Ahlsell Danfoss (Danmark) IVT Thermia Värme
Alfa Laval Dorin (Italy) NIBE
Climacheck Green and Cool RANOTOR Climate well Güntner (Germany) SRM
Per Lundqvist, Yang Chen, Energy Department, Royal Institute of Technology
[email protected] / [email protected]
The first CO2 heat pump for the Swedish market was released by Ahlsell on July 10th, 2005
Capacity-controlled by a variable-speed control (inverter).
An air source heat pump provides both space heating and domestic hot water (DHW) heating.
It is claimed to deliver 4.5 kW heat power down to an outdoor air tempe-rature of -15 °C and to be able to heat the water up to +70 °C.
tank charging with electric heater at -2°C Tamb - 2008-04-29
0
5
10
15
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25
30
35
40
45
50
55
60
65
70
0 900 1800 2700 3600 4500 5400 6300 7200 8100 9000 9900 10800 11700
time [s]
tem
pera
ture
[°C
]
0
1
2
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5
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7
8
9
10
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14
Flow
[m3/
h]; p
ower
[kW
]; C
OP
[-]
T_top
T1
T2
T3
T4
T5
T6
water gascooler outwater gascooler indeltaT_strat
compr. power
Flow scaled 10[m3/h]COP
el. heater stops
tank charging with no electric heater at -2°C - 2008-05-01
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
0 900 1800 2700 3600 4500 5400 6300 7200 8100 9000 9900 10800 11700time [s]
tem
pera
ture
[°C
]
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Flow
[m3/
h]; p
ower
[kW
]; C
OP
[-]
T_top
T1
T2
T3
T4
T5
T6
water gas coinwater gas cooutdeltaT_strat
compr. Powe
flow scaled 1[m3/h]COP
Frosting-defrosting periods at -2 degreeC Tamb and 3,4kW heating load 2008-04-14
-20
-10
0
10
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30
40
50
60
70
80
90
100
110
120
130
140
150
160
0 1800 3600 5400 7200 9000 10800 12600 14400 16200 18000 19800 21600 23400
time[s]
tem
pera
ture
[C]
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
heat
ing
capa
city
[kW
]; flo
w [-
]; CO
P [-]
; pow
er [k
W]
evap. air in
evap. air out
CO2 compr. In
water gas cooler in
water gas cooler out
CO2 Exp.-valve in
CO2 compr. Out
Comp
normalized flow[x/0,239]heating capacity
COP
problem in data logging
defrosting periods
temperature approach before defrosting
1st 2nd
