Manual T*SOL basic 5.0 - Valentin Software

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User Manual T*SOL 13 Appendix Energy supply → Energy input Expenditure factor -> System expenditure factor External financing Part of the capital commitment is covered not by personal capital but by taking out loans. If the loan interest is higher than the capital interest, borrowing incurs further costs. Final energy requirement QE [kWh/m²a] Calculated amount of energy available to the system technology (heating system, ventilation and airconditioning system, hot water heating system, light system) to ensure the set inside temperature, heating of warm water, and desired lighting quality over the whole year. This amount of energy includes the auxiliary power required to operate the system technology. The final energy is transferred at the "interface" of the building's external envelope and thus represents the amount of energy required by the user for use as intended under normative boundary conditions. The final energy consumption is therefore stated by energy sources used. DIN V 18599 Flow FL Flow generally denotes the warmer string in a heat loop. In a solar loop, flow corresponds to the pipe from the collector to the storage tank. Fresh water requirement here: the domestic water supplied to the swimming pool for filling. Fresh water station Hygienic domestic hot water heating with the help of a plate heat exchanger in a continuous flow process, compact station with heat exchanger, pump, controller. Fuel consumption The calculation of fuel use (natural gas, oil, wood pellets, district heating) is derived from the energy transferred to the auxiliary heating heat exchanger via the fuel's heat equivalent and the auxiliary heating efficiency. Fuel price [€/kWh] The price for the stated final energy valid at the time of calculation. It must be entered in the currency given in Windows' country settings. Fuel saving [€/a] Fuels are primarily used to generate heat. In addition to reducing heat loss, the use of solar heat generates fuel savings. The program converts the available solar heat at any one time, using the respective auxiliary heating efficiency and the corresponding heat equivalent of the energy source, into fuel savings. Global irradiance G (W/m 2 ) Hemispherical irradiation onto a horizontal surface. Gross collector area AG (m 2 ) Surface area of the collector excluding devices for attachment and the piping connection. Usually width by length. Calculated by the external dimensions of the collector; the specific collector parameters are not usually taken from the gross area but from the → active solar surface. Dr. Valentin EnergieSoftware GmbH page 94 / 104
13 Appendix User Manual T*SOL Heat consumption Hcon Heat exchanger HE Heat exchangers are used when heat is to be transferred between different heat transfer media. Internal and external heat exchangers are differentiated. Heat gains Qs, Qi Comprise the solar heat gains (dependent on the window area, type of window, and inclination) and the internal heat gains (e.g. produced by electrical appliances). Heat load ΦHL [W, kW] → Standard heat load Heat loss rate [W/K] Product of heat transfer coefficient and the surface of the heat exchanger. The value is equal to the quotient from transferred power and median logarithmic temperature difference at the heat exchanger. Heat losses Thermal losses occur through piping, radiation, and convection of heat in a collector. With selective absorber coatings, good thermal insulation or a vacuum, thermal losses can potentially be kept as low possible. Heat requirement Qh [kWh] The heating capacity required to maintain a target room temperature in a building (net energy). Heat requirement HR → Standard building heat flow requirement Heat transfer coefficient U [W/(m²K)] The heat transfer coefficient of a component describes the heat flow (heat lost) on a temperature difference of one Kelvin per square meter of the component. This is the crucial heat insulation property of outdoor components. The smaller the heat transfer coefficient, the better its insulation efficiency. Heat transfer coefficient (heat loss coefficient) of the collector k1 [W/(m²K)] k2 [W/(m²K²)] States how much heat the collector releases to its environment per square meter of active solar surface and temperature difference in Kelvin between the collector median temperature and the environment. It is split into two parts, the simple and the quadratic part. The simple part (in W/m²/K) is multiplied by the simple temperature difference, the quadratic (in W/m²/K²) by its square. This results in the typically stated efficiency parabolic curves. Heat transformer → Heat exchanger Heating cost Calculated from the quotients of → investment, → operating costs, and the heat generated (taking into consideration → lifetime and → capital interest). Heating flow Q Punkt Φth [W] Represents a quantitative description of heat transfer processes. The heating flow is an amount of heat (heat output) transferred in a given time; direction of flow always from area of higher temperature to area of lower temperature. page 95 / 104 Dr. Valentin EnergieSoftware GmbH
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Manual T*SOL basic 5.0 - Valentin Software

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