|Posted on June 16, 2016 at 10:25 AM|
On the 1st of June we had an appointment at Petry AG in Regensburger Street, Neumarkt. We were
given a presentation on the history and the layout of the company by Lukas Wolte. He is responsible
for managing the projects and the marketing for the company. Petry consists of two separate
companies, one being Petry GmbH. Petry GmbH has only has 4 employees and is responsible for the
structure, organization and the future planning of the main company. Lukas, his father and two other
staff members make up Petry GmbH. Petry AG is the main company that we visited and has around
120 employees, with 16-18 students doing their vocational training.
Petry was founded just after the 2nd World War, in 1945. The founder of the company died and
Lukas’s grandfather bought the company from the widow of Mr. Petry in 1955. In the 1960´s his grandfather
bought the area in the Regenburger Street, where it is located today.
Petry AG also works in cooperation with a university in Munich and to date, around 40 bachelor’s theses have
been written at the company through this cooperation.
In 2006 the company Petry AG was founded as it is today, when they decided to combine both
heating and cooling system installation and servicing into one company, when before they were
separate. The customers wanted a business where they could receive both services and not have two
separate contracts with two separate bills. There are also a few employees that have shares in the
company, but the company is not on the public stock exchange. In 2008 they became partners with
https://www.siemens.com/global/en/home.html" target="_blank" rel="nofollow">SIEMENS, where SIEMENS makes the control systems for the heating and air cooling systems for
Petry AG. They are a solution partner which means that they can work with or for SIEMENS but do
not have to ask permission from Siemens and can work independently.
In 2008 they built their current heating system that we had the privilege of seeing. They can produce
more than 900kW heat energy. With this energy they heat their own building, their neighboring
building and the medical center across the road. From 2009-2011 they installed 4 photovoltaic
systems on their roof, where they now produce up to 205 000 kW energy. This enables them to
supply their own electricity so they do not need to buy any. They only use about 20% of the
electricity that they generate, and the additional 80% that they produce they sell and put back into
the grid. There photovoltaic systems produce so much energy that the government can shut down
their systems on demand, because all of the energy produced cannot be used or stored.
In the past they offered their service to private households. Today they are only installing and
providing services to larger industries and organizations including hospitals, clinics, gymnasiums,
libraries and other companies to mention a few. They have a team of engineers ready to deal with
any heating systems problems that their customer may have. The heating systems are not
manufactured by Petry, but the components are bought, assembled and then put together and
installed. They have 4 energy systems at the company, three are used only for heat and one small system is
used for combined heat and electricity generation. They use the small system not primarily for the
energy generation, but to see how the system works, to see how much energy they can produce
from it and to see how much they use and how much they save. The other big heating systems that
they have are powered by woodchucks, wood pellets and wooden logs respectively. These are
carbon neutral systems, because they only use wood, a renewable energy resource and nothing else.
They get their wooden logs from their own forest about 3km from the company. The forest covers an
area of about 750 000m 2 and in this way they save money by not having to buy wood from a supplier.
The wood pellets have to be bought from suppliers. They even take wood
pallets (wooden planks) from the public. These pallets would be thrown away, so Petry takes the
opportunity to collect them and use them as a fuel in their heat production. This is another example
of “one man’s trash is another man’s treasure”.
The woodchuck and wood pellet systems are automatic systems, they fill the loading dockfull of
woodchucks and wood pellets and the systems feed themselves with fuel with a spiral screw until it
is time for another load again. The system using wood logs has to be refueled manually every few
hours. During last year’s heating season, they used around 70 tons of wood pellets, because the price
was really cheap, so they saved some money. They have to use the wood pellets within a certain
time, otherwise the pellets will turn to dust and are useless. The woodchucks however, must be
stored for a few weeks to dry so that the moisture content is less than 30%. The more moisture in
the woodchucks, the longer it takes to produce enough heat. Lukas says that the wood pellet system
is the easiest system to produce heat with.
They have a buffer tank that stores the hot water heated by the heating systems and when the water
reaches around 80˚C it shuts off automatically. This also saves energy so that they are not producing
more energy than they need.
We would like to thank Lukas Wolte for his willingness to show us around the company and for
showing us their heating systems.