Manual T*SOL basic 5.0 - Valentin Software

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