Lean Development

Holst, Joachim

doi:10.1007/978-3-642-78689-1

Cited by 1 publication

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“…In Table 1 the dimensions and thermophysical characteristics of the main envelope elements are reported; the transmittance values of the main envelope elements (vertical walls and int-floor) are typical of the northern Italian buildings built in years 1970-1990, as reported in [9]. The building has been modelized employing type 56 (multizone building), while the generators have been modelized in two different ways: the gas boiler have been modelized employing type 122 coupled to radiators radiators (types 320 and 362 [19]), while the heat pump has modelized employing two interpolators, in order to determine step-by-step, the Coefficient of performance of the machine (COP) and the thermal power output (P th ), function of the external air temperature and of the inverter frequency. The performance maps of the COP and heat pump thermal power output are reported in Figure 2, for different inverter frequencies.…”

Section: Setting Of the Analysismentioning

confidence: 99%

Influence of different heating systems on thermal comfort perception: a dynamic and CFD analysis

Ballerini,

Volo,

Pulvirenti

et al. 2024

J. Phys.: Conf. Ser.

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In this paper, we investigate the influence of different heating systems on the thermal comfort indexes, Predicted Mean Vote (PMV) and Predicted Percentage of Dissatisfied (PPD), for a residential apartment located in Bologna (Italy). The apartment has an area of 40 m2 and is located on the ground floor of 4 floors building. The envelop consists in horizontal perforated bricks with internal thermal insulation material and two windows. The analyses are performed employing Trnsys, a commercial dynamic simulation software and Simcenter STAR-CCM+, a multiphysics computational fluid dynamics (CFD) software. The CFD analysis regards a steady condition of a typical winter day in Bologna. Thermal comfort indexes and thermal energy demand are studied comparing two different heating generation systems existing in the considered apartment: a condensing gas boiler coupled with radiators as terminal emitters and an air-to-air heat pump. By crossing the results obtained by the dynamical approach and by the CFD simulations, a two-objective methodology where energy consumption is minimised while thermal comfort is obtained, is presented.

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Section: Setting Of the Analysismentioning

confidence: 99%