vertical ground heat exchangers
A Comprehensive Review of Vertical Ground Heat Exchangers Sizing Models With Suggested Improvements
... of vertical ground heat ...all ground heat exchanger elements are taken into ...Borehole heat transfer is solved in the Laplace domain with the use of a circuit of thermal ...
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Transient Heat Transfer in Vertical Ground Heat Exchangers
... TRANSIENT GROUND HEAT TRANSFER ...transient heat transfer from the borehole wall outwards, ...the ground. As shown later in Chapter 5, axial heat transfer effects become important after ...
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Development and application of test cases for comparing vertical ground heat exchangers models
... Since heat rejection is constant, it is convenient to present the results as a function of non-dimensional time, ln(t/ts ...typical ground thermal diffusivity of ...the heat injection, ...
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Topology optimization of heat and mass transfer in bi-fluid laminar flow : application to heat exchangers
... fluid-to-fluid heat exchangers optimization Size optimization Huang et ...a vertical ground heat exchanger used in HVAC systems, by minimizing entropy generation number using a genetic ...
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Flow Architectures for Ground-Coupled Heat Pumps
... the heat transfer performance of the evolutionary Y, T and classical design when the tree with the same number of bifurcation levels (N) and each design was constructed with same volume fraction φ ...
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Open loop thermal control of exothermal chemical reactions in multifunctional heat exchangers
... In a previous paper Ferrouillat et al. [8] studied the micro-mixing time in three generic heat exchanger geome- tries by using a physico-chemical technique based on a par- allel-competing reaction scheme and an ...
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A new transient thermal fouling probe for cross flow tubular heat exchangers
... Weighted sum of transient data Parameters estimation a b s t r a c t The present probe is developed in order to accurately estimate in situ not only the convective exchange coefficient but also the fouling thickness of ...
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Experimental and numerical study of flow distribution in compact plate heat exchangers
... compact heat exchangers are necessary for the present application because of the low heat transfer capacity of the gas ...the heat exchanger degrades due to ...
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Performance of a spiral ground heat exchanger for heat pump application
... Thermal energy was continuously extracted on a 24 h/day basis except at the end of the test program when the ground thermal response to cyclic heat withdrawal was investigated.. It shou[r] ...
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Performance simulation of multi-row dry (and/or wet) heat exchangers
... Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Performance simulation of multi-row dry (and/or wet) heat exchangers Elmahdy, A. H.; Biggs, R. C. ...
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Innovative Methodology to Compute the Temperature Evolution of Pile Heat Exchangers
... ( ) (15) A maximum time t max corresponding to the final Fourier number Fo max =10 4 and the Darcy velocity corresponding to the higher Peclet number (Pe=1.5) are reported in Table 1 for typical values of pile ...
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Study of the microstructure resulting from brazed aluminium materials used in heat exchangers
... Because dissolution of the core material occurs during the brazing process, attempt was made to measure the average Mn content in the brazing joint and in the re-solidified cladding mat[r] ...
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Possible Contamination of Ventilation Air by Rotary Air- to-Air Heat Exchangers
... cross flow of infectious organisms through the exchanger is a cause of concern to authorities dealing with approval of the device for hospital and apartment building ventilation systems.[r] ...
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Body-fitted topology optimization of 2D and 3D fluid-to-fluid heat exchangers
... co-current heat exchanger test case, ...co-current heat exchanger test case), which results in a slight degradation of the physical performance of the ...
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A convenient probe for the 2D thermal detection of fouling of tubular heat exchangers
... Several inverse methods have been recently developed in order to estimate the angular heat exchange distribution in cylindrical geometry (Maillet and Degiovanni 1989; Maillet et. al. 1996; Pasquetti et. al. 1991; ...
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Experimental study of single and two-phase adiabatic flow distribution in compact heat exchangers
... compact heat exchanger has been experimentally ...the vertical one because of ...the vertical position, the flow at the manifold inlet was always annular, whatever the inlet vapour ...
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Air-side particulate fouling of microchannel heat exchangers: Experimental comparison of air-side pressure drop and heat transfer with plate-fin heat exchanger
... • Arizona dust results in a larger decrease in heat transfer • The microchannel coil tested was much more sensitive to fouling by either Arizona or ASHRAE dust than the plate-fin heat ex[r] ...
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Optimizing ground heat exchanger length with GeoperformX pipe.
... conventional and GeoperformX pipes are for coaxial configurations with a thick outer pipe • 2U-pipe with GeoperformX has the lowest R b • The thermal mass of water , which will[r] ...
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Simplified modelling of the behaviour of 3D-periodic structures such as aircraft heat exchangers
... In this paper, experimental, analytical and numerical analysis are used to study and model the mechanical behaviour of a heat exchanger core consisting of a 3D-periodic structure. The purpose of the present ...
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Simplified modelling of the behaviour of 3D-periodic structures such as aircraft heat exchangers
... In this paper, experimental, analytical and numerical analysis are used to study and model the mechanical behaviour of a heat exchanger core consisting of a 3D-periodic structure. The purpose of the present ...
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