Heat pump systems adapted to highly-insulated office buildings - Comparison between simulations and field measurement
MetadataShow full item record
The temperature in the atmosphere is rising as a cause of human influence, and it was found that the building sector in 2012 emitted 18.4 % of the greenhouse gas (GHG) emissions on the planet (Pachauri et al., 2014). A solution to reduce the GHG emissions in the sector is the zero emission building (ZEB) concept. Cost-optimisation of the heating and cooling system in a ZEB is a challenge, and therefore the NTNU-SINTEF Zero Emission Building activity and the International Energy Agency Annex 40 have been working on a design tool for the selection of renewable thermal energy supply systems for non-residential near Zero Emission Buildings (nZEB).This design tool is called Simulation tool for Nearly Zero Energy buildings heat Pump installations (NZEP) and has been developed through the work of three master theses and three project works. This thesis is an continuation of a project work, written in the fall of 2015, investigated the possibilities of comparing the components in the simulation model with measured data from the CC-system of Powerhouse Kjørbo (Skjerve, 2016).The main objective in this thesis is therefore to compare simulations performed on the main components of NZEP to field measurements from Powerhouse Kjørbo. These components are considered the heat pump block, storage tank block and ground source heat exchanger block, and the thesis therefore only deals with these components. Pressure losses and flow abilities for the chosen components are not investigated.Comparisons for single component and multiple component simulations have been performed. For both kinds of comparisons, the inputs are gathered from and the outputs are compared to measured values from the CC-system at Powerhouse Kjørbo. Based on the comparisons and the discussions presented in this thesis, it is concluded that:- The heat pump block simulates steady-state performance very well, but that the start-up of the block should be compared to measurements with a lower sample rate.- The storage tank block is producing temperatures with similar trends as the measured data, but that a sensor should be mounted in order to calibrate the simulation properly.- The GSHE block simulates similar temperatures out of the borehole in situations where the volume flow in the real borehole is constant.- The simulation of multiple components works very well, all though there are additional complications in implementing a control strategy for the system.