Search results for "ASHRAE heat balance method"

showing 3 items of 3 documents

A criterion for the assessment of the reliability of ASHRAE conduction transfer function coefficients

2010

This paper presents a new mathematical approach, which, when applied to conduction transfer functions (CTFs) of a multi-layered wall, is able to predict the reliability of building simulations. This new procedure can be used to identify the best set of CTF coefficients, which are a critical point at the core of the ASHRAE calculation methodology founded on the transfer function method. To evaluate the performance of different CTF coefficient sets, the authors performed a large number of thermal simulations on the multi-layered walls included in the ASHRAE Handbook, volume fundamentals, and on other walls typical of Mediterranean building heritage. Those data were employed to test an algorit…

EngineeringSettore ING-IND/11 - Fisica Tecnica AmbientaleThreshold limit valuebusiness.industryMechanical EngineeringBuilding and ConstructionBuilding simulationThermal conductionTransfer functionCritical point (mathematics)ASHRAE heat balance methodThermal building simulationASHRAE 90.1CTF coefficientElectrical and Electronic EngineeringbusinessAlgorithmSimulationCivil and Structural EngineeringEnergy and Buildings
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Is the transfer function method reliable in a European building context? A theoretical analysis and a case study in the South of Italy

2005

Abstract The available tools for dynamic simulation of the buildings thermal behaviour are manifold, and the most modern ones, known as TRNSYS, are founded upon the use of the Z-transform (ZT) set also called transfer function method (TFM). The transfer function method (TFM), recommended by American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), is one of the most modern tools available to solve heat transfer problems in building envelopes and environments. TFM utilises Z-transforms to solve the equation system that describes the heat transfer in a multi-layered wall. Due to an analogy with an electric circuit, it is possible to write the equation system in a mat…

EngineeringSettore ING-IND/11 - Fisica Tecnica Ambientalebusiness.industryEnergy Engineering and Power TechnologyMechanical engineeringContext (language use)Control engineeringTRNSYSTransfer functionIndustrial and Manufacturing EngineeringDynamic simulationStep responseHeat transferASHRAE 90.1businessCTF coefficients ASHRAE heat balance method Thermal building simulationReliability (statistics)
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Single thermal zone balance solved by Transfer Function Method

2005

We present an algorithm that uses the Z-transform operator to face the problem of heat transmission in a single thermal zone composed by multilayered walls. The method is very flexible and could be adopted to calculate the transfer function coefficients able to simulate the thermal behaviour of a room in free floating. Knowing the transfer function coefficients, it is possible to simulate the dynamic profile of each inner surfaces temperature and furthermore of the inner air temperature. The proposed algorithm is fully described granting maximum clarity. The explicitness of all steps of the calculus make possible the definition of a method that is able to vary all of the calculus parameters…

Engineeringbusiness.industryMechanical EngineeringMathematical analysisBuilding and ConstructionTRNSYSTransfer functionsymbols.namesakeOperator (computer programming)Fourier transformSampling (signal processing)Heat transferThermalCalculussymbolsFundamental Resolution EquationElectrical and Electronic EngineeringbusinessCTF coefficients ASHRAE heat balance method Thermal building simulationCivil and Structural EngineeringEnergy and Buildings
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