Evaluating the energy and cost benefits of heat pumps in multi-occupancy dwellings

This paper provides a tabular analysis of an “outdoor air-water” heat pump in heating and domestic hot water system inside a multi-occupancy dwelling house. The study set out to compare a conventional system using the city’s district heat supply with one using an “outdoor air-water” heat pump. One part of the analysis is the energy performance of the renewable energy source. The study is also addressed the benefits of saving on conventional heat source and the period of financial return on the heat pump investment

Zero energy balance proposal for office buildings

The paper discusses the issue of prediction of electric energy production using a photovoltaic system which is directly installed at the administrative building. The problem with solar energy, which has been transformed using photovoltaic systems for electricity, is the low capacity to accumulate an excess of produced electricity. This excess of electricity we link within the power grid to send outside the building where the energy was produced to be consumed elsewhere. In this way, we achieve the highest possible utilisation of electricity produced within the boundaries of thebuilding itself. One option is to create opportunities to recharge electric vehicles during working hours, at the time when the production of electricity is the highest but the consumption of electricity is not

Reducing energy consumption with using ventilation and solar cooling, school building’s case study

The summer months are increasingly seeing a lot of hot days. Therefore, increasing demands for air conditioning in dwelling houses, hospitals, hotels, workspaces, and the other commercial buildings. In many countries air conditioning is the biggest consumer of energy in the buildings. Reducing energy consumption we can achieve in different ways.The article deals with reducing energy for cooling the various alternatives ventilation and solar cooling. The room under simulation was ventilated by six methods. Of these 6 cook lowest energy consumption and CO2 production had ventilation 90% overnight and 10% over day. Subsequently, using absorption refrigeration unit, powered by heat from the sun. In this case the power consumption is reduced to a minimum

Life Cycle Assessment and Economic Energy Efficiency of a Solar Thermal Installation in a Family House

Designing solar strategies is a powerful step forward to set up an adequate residential house in terms of energy. Many types of research have simulated the energy needs for residential buildings. Designing an improper installation can contribute to a growth in the overall energy expenditure in ensuring thermal comfort. The use of solar thermal processes in Slovakia is on a rise as compared to recent years. This study models twelve solar water heating systems created on the roof of the household. Solar energy techniques are carried out to comply with the demands of heating and domestic hot water. The analysis deals with the most efficient alternative for the arranged solar systems of the building. Considering these installations and the corresponding overall prices of machinery, the best workable alternative is selected. The potential energy performance of auxiliary heating and the energy output of the solar thermal installation are examined. The required amounts of the different energy contributions are modelled and simulated in specific software for a family house in Kosice, Slovakia. We determine the limits of the design for an apartment and analyse which procedure is used to provide the typical average water expenditure and heating need, covering a multi-criteria analysis considering costs, energy, and life cycle analysis of every installation. This approach can support professionals to decide the best scheme considering these criteria, and this method can be satisfactorily applied. In these conditions, converting a conventional gas boiler into a solar thermal system involves monthly economic savings of around EUR 140–250, with payback periods of 2.5–7 years. The energy requirements are fully covered by the solar thermal schemes and the life cycle assessment resulted in reasonable impacts on the environment.This study was financially supported by Grant Agency of Slovak Republic to support project No. 1/0512/20. This paper is also the result of the Project implementation: University Science Park TECHNICOM for Innovation Applications Supported by Knowledge Technology, ITMS: 26220220182, supported by the Research & Development Operational Programme funded by the ERDFI

Comparison of energy consumption in compressor and absorption cooling

This article deals with reducing electricity consumption required for cooling in order to achieve ‘near zero energy consumption’ for small buildings. Absorption equipment with a 5 kW capacity is used to accomplish this aim. For evaluation purposes, an experimental classroom with a rectangular shape (6x7 m2) with capacity of 13 participants is studied. Partial vacuum solar collectors with an area of 14 m2 will be used as the absorption unit and the needed electricity to power the device will be supplied by photovoltaic panels and an accumulation battery. The produced outputs are theoretically calculated values without specifically engaging the equipment, in order to verify simulations generated by the simulation programs

Analysis of the Solar Radiation Impact on Cooling Performance of the Absorption Chiller

Absorption cooling at low power is a new technology which has not yet been applied to current conditioning elements. This paper analyzes the various elements of solar absorption cooling. Individual states were simulated in which working conditions were set for the capability of solar absorption cooling to balance heat loads in the room

Investigation of a Ventilation System for Energy Efficiency and Indoor Environmental Quality in a Renovated Historical Building: A Case Study

This paper emphasizes the importance of environmental protection regarding the reduction of energy consumption while maintaining living standards. The aim of the research is to observe the effects of mechanical and natural ventilation on energy consumption and building operation as well as indoor environmental quality (IEQ). The results of indoor environmental quality testing show that the mean relative humidity (31%) is in the permissible range (30%–70%); the mean CO2 concentration (1050.5 ppm) is above the recommended value of 1000 ppm according to Pettenkofer; and the mean PM10 concentration (43.5 µg/m3) is under the limit value of 50 µg/m3. A very large positive correlation is found between relative humidity and concentration of CO2 as well as between the concentration of PM5 and the concentration of CO2. The most commonly occurring sick building syndrome (SBS) symptoms are found to be fatigue and the feeling of a heavy head