Free calculation tools for mechanical design engineers

GENIKI THERMANSEON publishes free online calculators for mechanical design engineers. Every calculation runs freely, without an account, and shows the result together with its method and its assumptions. A free account adds the full analysis, the monthly tables and the printable report for the calculation file.

Pool heating calculator

Pool heating capacity in kW from the heat losses: evaporation to ASHRAE or VDI 2089, ΤΟΤΕΕ 20701-3 climate and heat-pump output. No account needed.

Expansion vessel sizing

Free expansion vessel calculator to EN 12828 and DIN 4807-2 for heating, solar and DHW, with glycol. Size and pre-charge pressure, without signing up.

Radiator output at low flow temperatures

Are the existing radiators enough with a heat pump? Free check to EN 442: real output in watts, load coverage and the lowest usable flow temperature.

Buffer tank sizing

Free buffer tank calculator for a heat pump or a biomass boiler: volume in litres, litres per kW and which of the three requirements governs the size.

Heat pump sizing for a dwelling

How many kW of heat pump a dwelling needs: design heat loss to EN 12831 and the cooling peak, with ΤΟΤΕΕ 20701-3 climate and stated operating conditions.

Solar collector sizing for domestic hot water

Free solar collector calculator for domestic hot water: square metres, store volume and the solar fraction month by month, on ΤΟΤΕΕ 20701-3 climate data.

Climate data for Greek locations

Heating degree days to a base of 18 °C and the climate zone for every Greek location, with winter design temperatures where ΤΟΤΕΕ 20701-3 publishes them.