Solar water heater

Solar collector

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A solar collector which is applied in the system needs to be chosen here. The definition of the solar collector should be performed in Resources – Solar connectors (heat). The input screen will be adjusted to the different systems depending on how the solar collector is utilized (for heat, domestic hot water, or both).

Calculation method

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The calculation method for determining the solar contribution of the solar energy systems for domestic hot water is specified here. This method can only be specified if a solar water heater (domestic hot water) is specified for which the surface area of the solar collector is greater than 6 m² and smaller than or equal to 10 m². If the surface area of a solar collector is less than 6 m², calculation method A is used by default for solar water heaters (domestic hot water). For these solar water heaters, if the surface area is greater than 10 m² then calculation method B is applied by default.

§ Simple (method A)
The solar contribution of the solar water heater to domestic hot water is determined according to NEN 7120, section 19.6.3.

§ Detailed (method B)
The solar contribution of the solar water heater to domestic hot water is determined according to NEN 7120, Appendix I.

Type

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The type of solar water heater as it is applied in a domestic hot water system is indicated here. This type can only be specified if the solar water heater is used for domestic hot water only, i.e. if the system is ‘Domestic hot water generation’.

§ Solar water heater with auxiliary heating device
The solar water heater is a solar water preheater with a storage barrel for heat storage. The hot water from the barrel is reheated using a (combi) boiler during tapping. For the generation configuration a (combi) boiler needs to be defined in addition to the solar water heater.

§ Integrated gas reheater
The solar water heater is heated by a (combi) boiler using a heat exchanger in the storage barrel. The water is tapped directly from the storage barrel. For the generation configuration a (combi) boiler needs to be defined in addition to the solar water heater.

§ Integrated electric reheater
The solar heater contains an integrated electric reheater in the storage barrel. The water is tapped directly from the storage barrel. It is not necessary to define an additional generator for the generation configuration.

Operating mode reheating

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The operating mode for reheating of the solar energy system is indicated here. This operating mode is used in determining the correction factor for the capacity of the storage barrel of the solar energy system. It is only applied in calculation method B and if a solar energy system with integrated electric reheated is chosen.

§ Continuous
The reheating may be used throughout the day in order to heat up the storage tank

§ At night power
Reheating is only applied at night.

Dutch solar keymark

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This box indicates whether the solar energy system meets the requirements for the Dutch Solar keymark. The Dutch Solar keymark affects the flat rate determination of the annual solar contribution with calculation method A, and it affects the flat rate calculation of the heat loss coefficient and angle-dependency coefficient of the solar collectors with determination method B.

Annual solar contribution

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The annual solar contribution is applied in calculation method A. This contribution can be determined flat rate but may also be specified in detail. In the latter case a quality statement must be provided.

§ Flat rate
The annual solar contribution is determined from NEN 7120, Tables 19.10 and 19.11.

§ Detailed
The annual solar contribution is specified as "Energy emission at output solar energy" in MJ / year. This value is obtained from a quality statement and must be discussed in the calculation.

Insulated pipes

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It should be indicated whether the pipes have been insulated to determine the energy losses in the pipes within the collector circuit. The input regarding the insulation of pipes is only applied in calculation method B.