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Buildings 2016, 6(2), 16;

Hourly Calculation Method of Air Source Heat Pump Behavior

Construction Technologies Institute of National Research Council of Italy, Via Lombardia 49, San Giuliano Milanese, Milano 20098, Italy
D’Appolonia S.p.A., Via A. Liri 27, Genova 16145, Italy
Author to whom correspondence should be addressed.
Academic Editor: Christopher Underwood
Received: 1 February 2016 / Revised: 15 March 2016 / Accepted: 1 April 2016 / Published: 5 April 2016
(This article belongs to the Special Issue Modelling of Heating and Cooling in Buildings)
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The paper describes an hourly simplified model for the evaluation of the energy performance of heat pumps in cooling mode maintaining a high accuracy and low computational cost. This approach differs from the methods used for the assessment of the overall energy consumption of the building, normally placed in the so-called white or black box models, where the transient conduction equation is deterministically and stochastically solved, respectively. The present method wants to be the expression of the grey box model, taking place between the previous approaches. The building envelope is defined using a building thermal model realized with a 3 Resistance 1 Capacitance (3R1C) thermal network based on the solution of the lumped capacitance method. The simplified model evaluates the energy efficiency ratio (EER) of a heat pump through the determination of the hourly second law efficiency of a reversed Carnot cycle. The results of the simplified method were finally compared with those provided by EnergyPlus, a dynamic building energy simulation program, and those collected from an outdoor test cell in real working conditions. The results are presented in temperatures and energy consumptions profiles and are validated using the Bland-Altman test. View Full-Text
Keywords: hourly simplified model; RC model; heat pump; EER; reversed Carnot cycle hourly simplified model; RC model; heat pump; EER; reversed Carnot cycle

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Danza, L.; Belussi, L.; Meroni, I.; Mililli, M.; Salamone, F. Hourly Calculation Method of Air Source Heat Pump Behavior. Buildings 2016, 6, 16.

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