The municipality of Knivsta plans to expand from 15,000 to 25,000 inhabitants until the year 2025. In order to do so the municipality is planning to build a new residential area, Nydal. The purpose of this bachelor thesis is to estimate the heat demand for the new district and to investigate the advantages and disadvantages of using a common or an individual heat solution. The common solution consists of a pipe grid system connecting each building with a central heat source and in the individual solution each building has its own heat source. The heat units that have been used are combined heat and power and solar thermal heating. The total yearly heat demand for Nydal was calculated to total 21.6 GWh for the common solution and 19.4 GWh for the individual solution. This implies that the losses in the pipe grid are 2.2 GWh. The heat demand peaks are largest in January, about 7600 kW, and smallest in July, about 300 kW. To cover the heat demand for the common solution during summer, solar panels need to cover 6.5 per cent of the roof area. To be able to cover the heat demand for the larger buildings in the individual solution up to 45 per cent of the roof area needs to be covered with solar panels. Furthermore, the total installed heat power from CHP plants is 4320 kW in the common solution and 7375 kW in the individual solution. In conclusion, a common solution is to prefer because less CHP needs to be installed despite heat losses in the pipe grid.

This diploma thesis deals with possible energy-savings in the municipal buildings of Spytihněv. Moreover, it discusses the possible improvements of heating features and making use of renewable resources. This is meant to be achieved by a wrapper which is less demanding on energy consumption than those which have been used until now. Attention is also paid to a more efficient system of energy distribution. Both energetic and financial points of view are taken into consideration. The thesis consists of a few parts. Introduction, the first part, deals with renewable resources issues on a theoretical level. The second part is divided according to each individual analysed premise/building. At this point energy-saving proposal, choice of a heating system, a heating pump, a solar collector as well as energy-saving and financial calculation are included.

In 2007, in June the company Europrojekt entered the project with the requirement of the formulation and implementation of heating motherly school by heat pumps in the village Hluk. The projekt was ordered by the management of this motherly school. This is a total reconstruction of the heating system building motherly school, including the use of residual heat for heating the pool water in an open swimming pool, which is located near this motherly school. The requirement is also given to reduce environmental pollution and achieve energy savings. This diploma thesis solves the detailed description of solutions and calculations for each part. In first, the introductory part of the work is focused on getting the project, a description of the object motherly school and a proposal for the energy measure before the realization. Second section is devoted to the selection and design of the system of heat pumps and solar collectors. Next part of work is the use of the residual heat for heating the pool water in the transitional months, i.e. May, September and the main months June, July, and August, when should be the visit of the swimming pool the biggest. In addition, resolving heat recovery through plate exchangers, the calculation of storage tanks, valves insurance proposal, the expansion tank, circulation pumps, etc. The last part thesis addresses the energy and economic assessment of the whole project.