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Contenido archivado el 2022-12-27

LARGE-SCALE SOLAR HEATING SYSTEM FOR DISTRICT HEATING

Objetivo

The project's primary aim is to reduce the consumption of imported fuels - especially oil - by the use of renewable energy sources, and to reduce the individual consumers'heating expenses.
The project has, in addition the aim of advancing the use of solar energy use in district heating and to advance and promote the industrial development of solar collection and heating technology.
Two systems will be demonstrated generating a total of 2250 MWh/year. Expected payback is 12 years.

SYSTEM I :

======== A supply district servicing 140 consummers has been chosen.
- OPERATIONAL STRATEGY :
During the summer period all connection to the main distribution net is severed. A heat-exchanger is established in a collection well on the return arm. The solar collector is positioned centrally in the system. The solar collectors pipe connections are coupled directly to the hot side of the heat exchanger.
In the individual consumer's home, the existing hot water tank is replaced with a 200 l solar heat storage tank. The tank is fitted with a thermostatically controlled immersion heater for the sake of comfort. The central solar collector system functions as if it were an individually mounted solar heating system for the individual consumer. The decisive difference is that the district heating network functions as the distribution system. System I is easy to operate and organize and the total price for the system is only 60% of the price for individual solar heating systems,while at the same time maintaining a high degree of coverage.
Size of system 1.050 m2
Calculated annual efficiency (%) 20 %
Annual yield from solar collector 473 MWh
+ Savings on heat loss in distribution 407 MWh
Total energy supplanted 880 MWh
SYSTEM II :
=========
In other energy districts consisting of 390 consumers will be served.
- THE MAIN DISTRIBUTION SYSTEM :
The main distribution system is maintained year round at a temperature of 80 deg.C.
It is however possible to reduce the temperature in the subsidiary net during the summer period from 80 deg.C. to 50 deg.C. and thus achieve savings on distribution heat loss.
It is generally unnecessary to supply water of a higher temperature than 50 deg.C. during the summer months. This has been demonstrated from research on district heat consumers from Taastrup.
- SOLAR COLLECTOR OPERATION :
The solar collector system starts automatically when the collector's temperature exceeds the temperature in the return arm. This form of operation gives an uncomplicated co-operation between solar heat and district heat. When the solar collector can no longer cope with all the heating demand, the main net meets the additional heat supply. - ADVANTAGE :
The advantage with system II is that the temperature level in the subsidiary net can be considerably reduced, though not below comfort level. As opposed to system I this model requires no replacement of the domestic hot water tank. System size 1.950 m2
Calculated annual efficiency (%) 13 %
Annual output from collector 829 MWh
+ saving on distribution heat loss 541 MWh Total energy supplanted 1.370 MWh

Convocatoria de propuestas

Data not available

Régimen de financiación

DEM - Demonstration contracts

Coordinador

AKTIESELSKABET N. NELLEMANN
Aportación de la UE
Sin datos
Dirección
DIGTERVEJEN 11 JYTTEVEJ 18
9200 AALBORG SV
Dinamarca

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Coste total
Sin datos