DH source combinations Average investment Basic Classic HP + CHP HP + CHP + storage WH + HP WH + HP Million £/MW-heat MW MW MW MW MW MW
Heat source technology
Individual HP air-to water HP air-water
0.731
30
20
10
10
10
5
CHP Gas engine back pressure
0.9537
10
10
10
5
Electric boiler
0.0595
10
10
10
10
Natural gas boiler
0.051
30
30
10
10
10
10
High-gradewaste heat source
0
10
15
Storage (1) Investment per MWh capacity
0.0026
200
200
200
Total production capacity MW-heat
60
50
40
40
50
45
Investment production million £
23
16
18
18
18
10
Investments household units million £
13
13
13
13
13
13
Investment production million £
37
29
31
32
32
23
Saved Investments before network
35% 28% 30% 30% 30% 22%
Investment DH network £/MWh-heat
13.9 13.9 13.9
13.9
13.9 13.9
Investments £/MWh-heat
28.6 20.4 21.1
21.3
21.3 17.9
Reduced Investment % of basic
29% 26% 25% 25% 37%
Average heat price (OPEX costs) without heat storages £/MWh
29.34 31.66 15.55
Average heat price (OPEX costs) with heat storages £/MWh
15.4
11.2 15.36
Table 6: Average heat price without and with storage.
frequency and capacity on the power market is not included in calculations; only the day-ahead market prices are used. The production would be planned based on a prognosis from power retailers. In summary, the model shows the minimum value of the storage system by only calculating the simplest benefit from the day-ahead power market.
The average heat price is calculated for all scenarios, and the result is shown in Table 6.
The average heat price for the Table 4 scenario is 15.55 £/MWh- heat, which decreases to 15.40 £/MWh-heat if a storage system is used. The minimum savings of 0.15 £/MWh-heat by having a storage has to be compared to the average costs of 0.002 £/ MWh-heat delivery.
For further information please contact: John Tang Jensen, jtjensen10@gmail.com
25 www.dbdh.dk
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