A transient thermal analysis by thermal networks of the Passive House ‘POLITEHNICA’ from Bucharest

Abstract

This study aims to obtain the information about the thermal characteristics of the Passive House of University POLITEHNICA from Bucharest, Romania. Modelling a house by using the method of thermal networks is a way to find out the specific thermal reaction to the variable outdoor conditions. Heating, ventilation and air conditioning (HVAC) systems including their control have to synchronise with the thermal characteristics of the house expressed by the thermal reaction and heat consumption. The results of this study give the information necessary to define, calibrate and optimise an adequate HVAC system with specific reaction to and good prediction of the changing outer conditions in order to maintain a proposed thermal comfort with minimum energy consumption. Detailed analysis includes two scenarios: Free Running Mode (FRM) and Constrained Running Mode (CRM).The main tool used for this analysis is the software package Matlab-Simulink.

Modeling air leakage in buildings caused by the cyclic variation of the atmospheric pressure

“…The passive house ''Politehnica'' ( Figure 1) is built on the campus of University Politehnica of Bucharest as a result of the cooperation between several organizations and is the subject of representative studies. 20,[77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92] Several results obtained from this research platform have been gathered into a rich experimental measurements database that is now used in this study.…”

“…88 These assumptions consider, with approximation, a proportionality that allows further developments, and come as a consequence of several limitations of the available MD because of the availability of a single test Figure 1. Representation of real and theoretical model of the building [82][83][84][85] : (a) Passive house Politehnica and (b) virtual model of the passive house. Image taken with permission from Elsevier.…”

“…Image taken with permission from Elsevier. 83 equipment instead of two. Multizone analysis can insulate the influence of a partitioning wall [93][94][95] through strategies specific to the classical (physical) principle of superposition (of the overlay effects) along with the substantial support brought by the modeling through thermo-aeraulic analogy of the associated networks on the building.…”

“…Requirement Figure 2. Thermal instalations of the ''Politehnica'' building [82][83][84][85] walls compared with the alternative hypothesis of considering them external walls of the envelope. We resorted to a reductionist strategy that makes the mathematical model able to use the test results as a starting point.…”

“…The passive house “Politehnica” (Figure 1) is built on the campus of University Politehnica of Bucharest as a result of the cooperation between several organizations and is the subject of representative studies. 20,77–92 Several results obtained from this research platform have been gathered into a rich experimental measurements database that is now used in this study.

Figure 1.Representation of real and theoretical model of the building 82–85 : (a) Passive house Politehnica and (b) virtual model of the passive house.

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