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Conversion to heating and cooling systems based on ground-source heat pumps and air-to-water heat pumps is a well-proven measure to approach nZEB requirements. Furthermore, EU member states must stimulate the transformation of existing buildings undergoing renovation into nearly zero-energy buildings (nZEBs). Heat pumps enable the use of ambient heat at useful temperature level need electricity or other energy form to function. This directive opens up a major opportunity for further use of heat pumps for heating and cooling of new and existing buildings. It establishes a common framework for the promotion of energy from renewable sources. On 23 April 2009, the European Parliament and the Council adopted the Renewable Energy Directive 2009/28/EC. In order to realise the ambitious goals for the reduction of fossil primary energy consumption and the related CO 2 emissions to reach the targets of the Kyoto–protocol besides improved energy efficiency, the use of renewable energy in the existing building stock have to be addressed in the near future. At present, heat use is responsible for almost 80% of the energy demand in houses and utility buildings for space heating and hot-water generation, whereas the energy demand for cooling is growing year after year. Also, studies have shown that saving energy is the most cost-effective method to reduce greenhouse gas (GHG) emissions. Buildings represent the biggest and most cost-effective potential for energy savings. Energy consumption patterns EU reveal that buildings are the greatest energy consumer, consuming 41% of energy, followed by industry and transportation consuming approximately 30%. Finally, the simulations obtained in TRNSYS program are analysed and compared to experimental measurements.Īn economical strategy of a sustainable development imposes certainly to promote efficiency and a rational energy use in buildings as the major energy consumer in Romania and the other member states of the European Union (EU). Additionally, two numerical simulation models of useful thermal energy and the system coefficient of performance (COPsys) in heating mode are developed using the TRNSYS (Transient Systems Simulation) software. Furthermore, the thermal comfort for these systems is compared using the ASHRAE Thermal Comfort program.
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These performances were obtained with site measurements in an office room.
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The second objective of the chapter is to compare the main performance parameters (energy efficiency and CO2 emissions) of radiator and radiant floor heating systems connected to a GCHP. Also, a new GWHP using a heat exchanger with special construction, tested in laboratory, is well presented. The most typical simulation and ground thermal response test models for the vertical ground heat exchangers (GHEs) currently available are summarized. A general introduction on the GSHPs and its development, and a description of the surface water (SWHP), ground-water (GWHP), and ground-coupled heat pumps are briefly performed. This chapter mainly presents a detailed theoretical study and experimental investigations of ground-source heat pump (GSHP) technology, concentrating on the ground-coupled heat pump (GCHP) systems.