Until the first half of the last century, the territory of the ROHAN CITY project was the riverbed of Vltava; then it was filled up and moved towards north. The newly created areas were used for industrial and storage purposes; however, in the course of years, they became neglected brownfield areas.
The territory in question, occupying an area of twenty hectares, is connected with the Vltava river by extensive park areas of the “Green Island”. Making the generous areas with green vegetation accessible is an important idea of the proposal for revitalisation of the territory. The well-planned system of green areas is complemented with a system of pedestrian paths and biking paths.
The pedestrian route connecting the territory with the Invalidovna metro station forms the main transversal axis of the territory. The area in front of the residential and office buildings will offer a number of services, restaurants, shops and facilities for leisuretime activities. At the point where this axis meets the embankment promenade, water cascades and terraces have been designed to emphasise the integration with the river and the views of the panorama of the Prague Castle.
Residential and office buildings are smoothly linked to the busy centre. Housing facilities have been designed in the peaceful part of the territory extending towards the river; conversely, the office buildings form a sanitary barrier along the Rohanské nábřeží street. The proposal assumes that approximately 1,300 apartments and an area of 130,000 m2 for offices, services, retail shops and leisure-time activities will be built.
The Rohan City project brings completely new trends of mass-scale construction into the Czech Republic. Right from the beginning, the project is designed with regard to its complete life cycle, which comprises its preparation, implementation, operation and possible recycling at its end, while maintaining a high level of comfort and an exceptional quality of the environment for the users. Revitalisation of brownfield areas in the inner developed part of the city is the environmentally most considerate method of activating new areas for development of the city. Moreover, the generous design of the Rohan City project brings new recreational areas of a citywide importance and contributes to a marked improvement in the quality of the environment as well as the overall micro-climate of the city.
- The urban proposal is based on the symbiosis of the areas for housing, work, sports and leisure in a single locality. The short distances that can be covered on foot minimise the need for automobile transport in the territory. This effect is augmented by the excellent integration of the entire territory into the system of city public transport and the citywide network of biking paths.
- The new grade line of the territory is to be increased as compared with the existing one in order to achieve a zero balance of soil, that is, to achieve balanced volumes of embankments and excavations, with the aim of reducing the level of traffic and the impact of the construction process on the environment. The new terrain modelling clearly defines the public, half-private and private areas and therefore it is also a significant urban tool.
- The proposed urban structure was verified by the method of optimising the energy requirements of the buildings, based on a virtual 3D model of the territory, using a dynamic simulation. This analysis resulted in modifications to the urban design made with the aim to create an energy concept that would allow constructing buildings according to the latest environmental knowledge and that would bring significant savings in primary energy.
The energy concept:
- To reduce the energy requirements for heating the buildings by up to 15 % in the apartment buildings and by up to 24 % in the office buildings.
- To increase the intensity of utilising passive solar energy gains by up to 40 % in both residential and office building.
- To reduce the heat transmission in the apartment buildings by up to 14 % during the heating season
- To reduce the requirement for energy to cool the office buildings by up to 25 %.
- Using hot-water pipe as a low-cost source of heat.
Renewable sources and energy recovery:
- A technical design making it possible to share or transmit the unused heat between office and residential buildings (heating/cooling/ventilation).
- New retention tanks making it possible to make secondary use of rainwater in the territory, both for irrigation systems and for creating water elements as part of outdoor architecture.
- To minimise the consumption of primary energy by utilising the power potential of Vltava, for example, by means of energy piles, which also solve the problem with constructing foundations in a complicated geological environment.