ElsevierRuiz Calvo, F.; Rosa, MD.; Acuña, J.; Corberán Salvador, JM.; Montagud Montalvá, CI. (2015). Experimental validation of a short-term
AbstractThe design and optimization of ground source heat pump systems require the ability to accurately reproduce the dynamic thermal behavior of the system on a short-term basis, specially in a system control perspective.In this context, modelling borehole heat exchangers (BHEs) is one of the most relevant and difficult tasks. Developing a model that is able to accurately reproduce the instantaneous response of a BHE while keeping a good agreement on a long-term basis is not straightforward. Thus, decoupling the short-term and long-term behavior will ease the design of a fast shortterm focused model. This work presents a short-term BHE dynamic model, called Borehole-to-Ground (B2G), which is based on the thermal network approach, combined with a vertical discretization of the borehole.The proposed model has been validated against experimental data from a real borehole located in Stockholm, Sweden. Validation results prove the ability of the model to reproduce the short-term behavior of the borehole with an accurate prediction of the outlet fluid temperature, as well as the internal temperature profile along the U-tube.
ElsevierMonzó Cárcel, PM.; Mogensen, P.; Acuña, J.; Ruiz Calvo, F.; Montagud Montalvá, CI. (2015). A novel numerical approach for imposing a temperature boundary condition at the borehole wall in borehole fields. Geothermics. 56:35-44.
This paper is concerned with the development of a mathematical model, capable of describing the quasi steady state performance of an integrated ground source heat pump, which is used for heating and cooling of an institutional building located in a Mediterranean climate. The model is structured on functional basis according to the heat pump vapour compression or primary circuit, a secondary ground loop circuit and a secondary building loop circuit. Heat pump heating and cooling capacities, as well as COP, are considered to be dependent variables and are estimated in the model using performance fitted maps. Independent variables include: compressor speed, circulation pump speeds, ground loop return temperature and building circuit return temperature. The model is validated using data from a full scale ground source heat pump installation. The validated model is used to examine system capacity and performance sensitivity to different control optimisation strategies, including set-point control of room air temperature, room air bandwidth temperature, building loop return water temperature and building loop return bandwidth temperature. Please imagine how each figure would look after being published, published in black and white and a maybe being reduced in the size. Hour in international system is only h not hr. I also noticed that among references there is no one concerning papers we published in our journal, and we had a lot. We recommend to put in references these papers, not to be impression of the potential readers that our journal never wrote anything about the problem you are treating. Please, be so kind and go through our previous issues and be informed what we published. And please add in the references. It is important to give some link and contiunation with our previously published papers.Regards, B.Todorovic, editor.
Reviewers' comments:Reviewer #1: I recommend reviewing the reported overall heat transfer coefficient (U) associated with the conditioned space. Please note that the value of U is usually less than 1.0 W.m-2K-1.Could be 1.7 W.m-2K-1. instead of reported 17 W. The Editor of Energy and Buildings asked that additional references be included. The following additional text has been added to the body of the paper The primary difference between ground and air-source heat pumps can be attributed to the external source. GSHPs offer relatively constant operating parameter for short term measurements insuring a smaller temperature difference between the condenser and evaporator when compared to ASHPs [8]. In a study by Liu and Hong [9] an air source heat pump with variable compressor control was compared to a GSHP with on/off control. The GSHP was shown to be more efficient than the ASHP especially at high heating loads, but less so at part loads.Chen [13] and Guo and Nutter [14] also studied optimal zone set-point temperatures for heating and cooling to improve system performance.The Editor of Energy and Buildings asked that that the colour of the diagrams be evaluated so that the paper can...
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