A new paper on the energy efficiency of buildings (here, ice hockey halls) is now published!
Energy analysis in ice hockey arenas and analytical formula for the temperature profile in the ice pad with transient boundary conditions
The energy efficiency of ice hockey arenas is a central concern for the administrations, as these buildings are well known to consume a large amount of energy. Since they are composite, complex systems, solutions to such a problem can be approached from many different areas, from managerial to technological to more strictly scientific. In this paper we consider heat transfer processes in an ice hockey hall, during operating conditions, with a bottom-up approach based upon on-site measurements. Detailed heat flux, relative humidity and temperature data for the ice pad and the indoor air are used for a heat balance calculation in the steady-state regime, which quantifies the impact of each single heat source. We also solve the heat conduction equation for the ice pad in transient regime, and obtain a general analytical formula for the temperature profile that is suitable to practical applications. When applied to the resurfacing process for validation, it shows good agreement with an analogous numerical solution. Since our formula is given with implicit initial condition and boundary conditions, it can be used not only in ice hockey halls, but in a large variety of engineering applications.
Our paper discussing the usage of geothermal energy for heating buildings is now published. You can download the full version from the publisher at the following webpage:
Our paper “A combined analytical model for increasing the accuracy of heat emission predictions in rooms heated by radiators” is now published on the Journal of Building Engineering. Here is the link to the pdf (free download for the next 50 days):
The efficiency of heat emitters plays an important role in the improvement of building energy performance, especially in the context of system and product comparison. In particular, it can be directly related to thermal comfort via the operative temperature that is effectively sensed by the users.
For the first time in the literature, in this paper we develop a combined analytical model for room and radiator that computes directly the heat output required to maintain a specific operative temperature. The total heat balance of the enclosure is used to accurately quantify and compare the heat emission losses of different radiator types via an analytical calculation of the operative temperature. This determines the efficiency of a selection of panel radiators with different surface temperature, radiation fraction and number of panels, which were tested in a chamber conforming to the EN 442-2 standard.
Additionally, we assess the related annual energy consumption in different climates by carrying out annual simulations in old (without heat recovery) and new (with heat recovery) building types located in Tallinn, Estonia and Strasbourg, France. In the new building we find a similar performance for all the radiators. In the old building however, one radiator outperforms the other two with up to 1.38% lower annual energy consumption, due to smaller rear losses and higher thermal comfort provided by the larger front panel surface.
Domestic Hot Water (DHW) is an important source of energy consumption for any type of building. I attach here the slides of a short (20 mins) talk I gave on this topic yesterday, at the Energy7 conference in Manchester UK:
Analytical modelling and prediction formulas for domestic hot water consumption – slides
I briefly outline an analytical bottom-up method to model DHW consumption accurately. We
1) derive the correlations between occupant groups and different seasons => MAIN TREND OF CONSUMPTION
2) generate a PREDICTIVE FORMULA for the DHW consumption of unknown occupant groups.
The slides are in PDF format (just use the pgup/pgdn keys on your keyboard to scroll). The talk is based on a paper I published last Spring, described in this entry of my blog.
Greetings from Manchester!