339,461 research outputs found
Modelling of shaded and unshaded shallow-ground heat pump system for a residential building block in a Mediterranean climate
Heat pumps may be coupled to shallow-ground geothermal fields and used for the purpose of space heating and cooling of buildings. However, quite often it is not possible to locate the geothermal field in cleared grounds, especially in cities where building density is high and land has a high premium. This leads to the possibility of burying the geothermal field under the basement of new building blocks, before construction of the building. In the present work, the shaded-unshaded arrangement is numerically studied by coupling the software DesignBuilder-EnergyPlus to assess the building's energy requirement with the software FEFLOW to solve the heat transfer equation in porous media. Assuming a standard residential building block, the coupling between the two software is performed by assigning the thermal energy requirement for air conditioning, as calculated by EnergyPlus, to a flat-panel typology of ground heat exchanger simplified in a 2D FEFLOW's domain. The results show that it is necessary to opt for a dual-source heat pump (air/geothermal) system to ensure that the ground is not frozen or over-heated at peak times and to improve the overall performance of the system.peer-reviewe
Eksplorasi Teknik Heat Transfer Printing dengan Zat Warna Dispersi pada Kain Sintetis
Seiring perkembangan jaman dan teknologi, perkembangan pada industri tekstil pun turut berkembang. Setelah tekstil sintetis berkembang di industri tekstil pada tahun 1920-an, teknik pengolahannya pun turut mengalami perkembangan dikarenakan tekstil sintetis memiliki sifat hydrophobic dan thermoplastic. Zat warna yang dirasa cocok untuk mewarnai tekstil sintetis adalah zat warna disperse yang berkembang pada awal tahun 1940. Kemudian ditemukan suatu teknik olah latar tekstil tersebut setelah beberapa percoban dengan zat warna disperse di tahun yang sama. Percobaan yang dilakukan didasari oleh sifat zat warna disperse yang ringan dan mudah tersublimasi jika terkena panas, didukung oleh sifat tekstil sintetis yang thermoplastic yaitu tenunannnya memiliki tendensi untuk meregang ketika terkena panas dan tekanan. Zat warna dispersi diwarnai diatas medium kertas yang kemudian diletakkan diatas kain sintetis kemudian diberikan perlakuan panas dan tekanan. Zat warna disperse yang tersublimasi akan berpindah dari kertas masuk ke pori-pori kain sintetis yang sedang meregang dan saat temperatur kembali pada suhu normal, struktur kain akan kembali ke sedia kala dan mengikat zat warna pada permukaan kain. Sehingga heat transfer printing menjadi salah satu teknik tekstil modern untuk reka latar kain sintetis
Modelling thermal effects in agitated vessel and reactor design consideration
The knowledge of the heat transfer coefficient on the inner side of a heated vessel wall is of utmost importance for the design of agitated vessels. The present contribution deals with heat transfer in an agitated vessel containing non-Newtonian liquid. The impellers used are six-blade Turbine (TPD) and a Propeller (TPI). The following aspects are discussed: description of the heat transfer process with the aid of dimensional analysis, heat transfer correlations for agitated liquid and influence of impeller speed on heat transfer
Heat transfer device
An improved heat transfer device particularly suited for use as an evaporator plate in a diffusion cloud chamber. The device is characterized by a pair of mutually spaced heat transfer plates, each being of a planar configuration, having a pair of opposed surfaces defining therebetween a heat pipe chamber. Within the heat pipe chamber, in contiguous relation with the pair of opposed surfaces, there is disposed a pair of heat pipe wicks supported in a mutually spaced relationship by a foraminous spacer of a planar configuration. A wick including a foraminous layer is contiguously related to the external surfaces of the heat transfer plates for uniformly wetting these surfaces
Heat transfer device
A heat transfer device is characterized by an hermetically sealed tubular housing including a tubular shell terminating in spaced end plates, and a tubular mesh wick concentrically arranged and operatively supported within said housing. The invention provides an improved wicking restraint formed as an elongated and radially expanded tubular helix concentrically related to the wick and adapted to be axially foreshortened and radially expanded into engagement with the wick in response to an axially applied compressive load. The wick is continuously supported in a contiguous relationship with the internal surfaces of the shell
Heat transfer, condensation and fog formation in crossflow plastic heat exchangers
In this paper heat transfer of air-water-vapour mixtures in plastic crossflow heat exchangers is studied theoretically and experimentally. First, a model for heat transfer without condensation is derived, resulting in a set of classical differential equations. Subsequently, heat transfer with wall condensation and fog formation are considered in some detail. Separate attention is paid to the heat transfer and condensation of pure steam in the heat exchanger. Finally, the experiments performed are reported and the results compared with the models presented. From this comparison it can be learnt that the models are well able to predict the rate of heat transfer and phenomena such as condensation and fog formation
Near-field radiative heat transfer between macroscopic planar surfaces
Near-field radiative heat transfer allows heat to propagate across a small
vacuum gap in quantities that are several orders of magnitude greater then the
heat transfer by far-field, blackbody radiation. Although heat transfer via
near-field effects has been discussed for many years, experimental verification
of this theory has been very limited. We have measured the heat transfer
between two macroscopic sapphire plates, finding an increase in agreement with
expectations from theory. These experiments, conducted near 300 K, have
measured the heat transfer as a function of separation over mm to m and as
a function of temperature differences between 2.5 and 30 K. The experiments
demonstrate that evanescence can be put to work to transfer heat from an object
without actually touching it
Hidden heat transfer in equilibrium states implies directed motion in nonequilibrium states
We study a class of heat engines including Feynman's ratchet, which exhibits
a directed motion of a particle in nonequilibrium steady states maintained by
two heat baths. We measure heat transfer from each heat bath separately, and
average them using a careful procedure that reveals the nature of the heat
transfer associated with directed steps of the particle. Remarkably we find
that steps are associated with nonvanishing heat transfer even in equilibrium,
and there is a quantitative relation between this ``hidden heat transfer'' and
the directed motion of the particle. This relation is clearly understood in
terms of the ``principle of heat transfer enhancement'', which is expected to
apply to a large class of highly nonequilibrium systems.Comment: 4 pages, 4 figures; revise
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Heat Transfer Activity for a First-Year Mechanical Engineering Course
A heat transfer educational activity is designed for
freshman students who declare a mechanical engineering major.
This activity is part of an introductory course given during the
first year to introduce students to mechanical engineering and
give them tools to use in while pursuing their Bachelors of
Science degree in mechanical engineering.
The activity is designed to challenge students in
learning heat transfer concepts. However, its rigor is planned for
students (at the freshman level) who have not yet taken the
prerequisites required for heat transfer.
The activity is scalable and can be easily deployed in
other educational institutes. It is presented with its goals, goal
attainment measures, and feedback representing the student
perception.Cockrell School of Engineerin
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