Max Hottinger

Max Hottinger (born October 23, 1879 ; † January 13, 1948 in Zurich ) was a Swiss engineer and private lecturer at the ETH Zurich .

Life

After high school and engineering studies at the Polytechnic in Zurich, Hottinger worked for 10 years in industry, starting with the Sulzer brothers in Winterthur , where he worked in the heating and ventilation department. He then went into self-employment as a consulting engineer. From 1920 he taught at the ETH Zurich as a private lecturer for heating and ventilation. He has published several books on his subject and articles in magazines such as Health Engineer , Swiss Sheets for Heating and Ventilation and Swiss Construction Journal .

plant

Hottinger's achievements in energy and heating technology live on in the Hottinger formulas named after him :

• Calculate the heating output from the fuel consumption.

In general terms:

${\displaystyle {\dot {Q}}_{h,\mathrm {max} }={\frac {E\cdot 0.86\cdot \Delta T_{\mathrm {max} }}{t_{\mathrm {H} }\cdot \mathrm {HGT} }}}$, in which

${\displaystyle {\dot {Q}}_{h,\mathrm {max} }}$: Delivery capacity

E : Annual consumption in kWh ( H _u , calorific value ).

0.86: Combustion efficiency (86%)

${\displaystyle \Delta T_{\mathrm {max} }:T_{i}-T_{a}}$: Temperature difference inside to outside

${\displaystyle t_{\mathrm {H} }}$: Hours of use per day ("Hottinger number")

HGT: heating degree days

The original formula was designed for heating oil:

${\displaystyle {\dot {Q}}_{h,\mathrm {max} }={\frac {B\cdot 42\,700\,\mathrm {^{kJ}\!\!/\!_{kg}} \cdot 0.86\cdot \Delta T_{\mathrm {max} }}{3600\,\mathrm {^{s}\!\!/\!_{h}} \cdot t_{\mathrm {H} }\cdot \mathrm {HGT} }}}$

B : Energy consumption (kg heating oil)

42 700 kJ / kg: H _u (heating oil)

3600 s / h: conversion kJ into kWh

• Annual heat demand through transmission

literature

Books

• Max Hottinger, Wilhelm von Gonzenbach: The heating and ventilation systems in the various types of buildings: including hot water supply, humidification and defog systems , Springer, Berlin, 1940, ISBN 978-3-662-01891-0 , doi : 10.1007 / 978-3- 662-02186-6 .
• Max Hottinger: Climate and degree days, in their relationship to heating and ventilation technology , Springer, Berlin, 1938, ISBN 978-3-642-89885-3 , doi : 10.1007 / 978-3-642-91742-4 , ( pdf ) .

items

• Max Hottinger (1920), article / letter to the editor, In: Schweizerische Bauzeitung , issues 75–76, page 120, ( Google books, snippet view )

credentials

1. ↑ ETH Alumni (1948): Schweizerische Bauzeitung: Wochenschrift für Bau-, Verkehrs-, und Maschinentechnik , p. 58, ( Google Books, snippet view ).
2. ↑ Necrologist. In: Schweizerische Bauzeitung. Volume 66, Issue 10, 1948, pp. 140-141 ( PDF ).
3. ↑ M.Duerig (2019): Hottinger formula, In: Hans Dürig AG - Blog: Collection of formulas, heat theory , link .
4. ↑ Paul Bossert: Mathematical and physical basics of 8 energy-relevant factors of an external wall , p. 3, Basel, October 5, 2016, ( Link ).