Kolpingquarter Salzburg - on site quarter energy supply with an optimized warmwater solution and grid serviceability

Starting point/Motivation

There are two existing buildings on the site of the Kolpinghaus Salzburg: the main building, which was completed in 1998 and is mainly used as a youth hostel, and the Eco-Suite Hotel, which started operations in 2016 and comprises 44 hotel rooms. In addition to 144 rooms with 255 beds, the main building also includes a commercial kitchen and a seminar and event area.

In the course of the construction of the Eco-Suite Hotel, an accompanying demonstration project was carried out (program "House of the Future Plus"). Highlights of this project were the achievement of a high efficiency standard for the Eco-Suite Hotel (passive house standard, energy-efficient lighting), the installation of a wastewater heat recovery system (system Fa. FEKA), as well as the coupling of the heat supply for both buildings.

In addition to the heat supply via a heat pump (heat source wastewater), a gas boiler is also in operation. There is currently a 30 kWp photovoltaic system on the roof of the Eco-Suite Hotel, but there is still a large area potential for further PV systems (especially on the roof of the older existing building, potential: approx. 190 kWp). Initial analyses have shown that there is also considerable potential for reducing the energy consumption of the existing buildings.

Contents and Objectives

On a currently undeveloped part of the site, a third building is to be erected (residential building with approx. 30 residential units, affordable housing for young people and families (former residents of the Kolpinghaus); keyword "Junges Wohnen").

Methods

In the course of this new construction, the owner Kolpingfamilie Salzburg intends not only to construct the new building to the best possible energy standard, but also to rethink the overall energy supply of the quarter and to develop and implement new solutions in this regard.

The goals are the highest possible use of (renewable) on-site energy, an exit from fossil heat supply, a networking of the buildings (heat and power supply) as well as an optimization of the existing buildings in terms of energy, with special consideration of grid efficiency (keywords Building2Grid, Vehicle2Grid).

Work steps

• Creation of an energy supply concept for the entire neighborhood
• (Energy) simulation of the interplay between building and building technology
  Mapping of the entire system (building (new and old), building/house technology, electrical, PV) in a simulation environment (IDA ICE)
• Thermal energy supply
  • new heat pump solution (use of drainage water from a nearby power plant) for the new building, but also consideration of the existing buildings for heat supply -> (planning of a heat network, heat exchange)
  • Heat distribution via building component activation for the new building (incl. cooling / temperature control in summer)
  • Hot water solution (alternative approaches reg. legionella issue / temperature reduction (ultrafiltration, disinfection)); measures to minimize hot water demand)
• Energetic optimization of the existing buildings
  • Analysis of weak points
  • Optimization of control systems: e.g. individual room control with window contacts, improved control of ventilation systems.
  • Optimization of existing roof (structural-physical and static assessment and improvement if necessary, installation of a PV system (190 kWp) on the existing roof)
  • If necessary, equipment replacement program (incl. lighting)
• Electrical energy supply with focus on grid efficiency
  • Bidirectional charging stations for e-cars (development of business model(s), use cases, preferably in coop. with Salzburg AG, Digital Solutions)
  • Grid-serving control of heat pumps on the basis of weather data or forecasts
  • Integration of battery storage
  • Additional PV system (on the large existing roof)
• Design and planning of building automation (as an essential integral topic, which is often implemented suboptimally).

Project management

Schöberl & Pöll GmbH

Project or cooperation partners

• Kolpingsfamilie Salzburg Zentral
• Karres TB GmbH
• Bauvorsprung GmbH & Co KG
• R + S Group Regeltechnik und Schaltanlagenbau GmbH
• Alexander Keul

Schöberl & Pöll GmbH
DI Dr. Ernst Schriefl
Lassallestraße 2/6-8
A-1020 Wien
Tel.: +43 (1) 726 4566 17
E-mail: ernst.schriefl@schoeberlpoell.at
Web: www.schoeberlpoell.at