Aalborg Universitet Cooling of the Building Structure by Night-time Ventilation Artmann, Nikolai
... expectations, air conditioning is increasingly applied even in moderate and cold climates, like in Central and Northern Europe. Particularly in these cases, night-time ventilation is often seen as a promising passive cooling concept. Many successful examples of passively cooled buildings demonstrate ...
... expectations, air conditioning is increasingly applied even in moderate and cold climates, like in Central and Northern Europe. Particularly in these cases, night-time ventilation is often seen as a promising passive cooling concept. Many successful examples of passively cooled buildings demonstrate ...
Energy performance of buildings — Calculation of energy use for
... Total heat transfer by ventilation.......................................................................................................35 Ventilation heat transfer coefficients ................................................................................................36 Input data and boundar ...
... Total heat transfer by ventilation.......................................................................................................35 Ventilation heat transfer coefficients ................................................................................................36 Input data and boundar ...
Ventilative Cooling
... This report summarizes the work of the initial working phase of IEA ECB Annex 62 Ventilative Cooling and is based on the findings in the participating countries. The report is an official Annex report that describes the state-of-the-art ventilative cooling potentials and limitations, its considerati ...
... This report summarizes the work of the initial working phase of IEA ECB Annex 62 Ventilative Cooling and is based on the findings in the participating countries. The report is an official Annex report that describes the state-of-the-art ventilative cooling potentials and limitations, its considerati ...
Forced-Circulation Air-Cooling and Air-Heating Coils
... 3.5 Laboratory Tests. Tests conducted by a manufacturer on representative coils to determine basic heat transfer and pressure drop characteristics that shall be used in developing Published Ratings. 3.6 Published Ratings. A compilation of the assigned values of those performance characteristics, und ...
... 3.5 Laboratory Tests. Tests conducted by a manufacturer on representative coils to determine basic heat transfer and pressure drop characteristics that shall be used in developing Published Ratings. 3.6 Published Ratings. A compilation of the assigned values of those performance characteristics, und ...
cooling of electronic equipment
... of the integrated circuits (IC), where several components such as diodes, transistors, resistors, and capacitors are placed in a single chip. The number of components packed in a single chip has been increasing steadily since then at an amazing rate, as shown in Fig. 15–1. The continued miniaturizat ...
... of the integrated circuits (IC), where several components such as diodes, transistors, resistors, and capacitors are placed in a single chip. The number of components packed in a single chip has been increasing steadily since then at an amazing rate, as shown in Fig. 15–1. The continued miniaturizat ...
chapter 11 - Description
... A building surface influences comfort primarily through its surface temperature; secondarily, a surface can modify air temperature (as when cool air moves across a warm surface). As important as these two determinants of comfort are, they are often not sufficient by themselves. In cooling situations ...
... A building surface influences comfort primarily through its surface temperature; secondarily, a surface can modify air temperature (as when cool air moves across a warm surface). As important as these two determinants of comfort are, they are often not sufficient by themselves. In cooling situations ...
User Guide for Hospitals
... guides accompanying them. This guide is specifically for the design and construction of new hospitals. EDGE is an innovation of IFC, a member of the World Bank Group. ...
... guides accompanying them. This guide is specifically for the design and construction of new hospitals. EDGE is an innovation of IFC, a member of the World Bank Group. ...
A scaling law for approximating porous hydrothermal convection by
... heat flux in very young lithosphere turns out to be less than expected by the SRTL (e.g. Stein & Stein 1992), and for old oceanic lithosphere the decrease of heat flow with age is less than predicted by the SRTL. Starting with Talwani et al. (1971) and Lister (1972), it has been pointed out, that th ...
... heat flux in very young lithosphere turns out to be less than expected by the SRTL (e.g. Stein & Stein 1992), and for old oceanic lithosphere the decrease of heat flow with age is less than predicted by the SRTL. Starting with Talwani et al. (1971) and Lister (1972), it has been pointed out, that th ...
11Chapter11_MEEB12-W..
... A building surface influences comfort primarily through its surface temperature; secondarily, a surface can modify air temperature (as when cool air moves across a warm surface). As important as these two determinants of comfort are, they are often not sufficient by themselves. In cooling situations ...
... A building surface influences comfort primarily through its surface temperature; secondarily, a surface can modify air temperature (as when cool air moves across a warm surface). As important as these two determinants of comfort are, they are often not sufficient by themselves. In cooling situations ...
chapter 11 - Description
... A building surface influences comfort primarily through its surface temperature; secondarily, a surface can modify air temperature (as when cool air moves across a warm surface). As important as these two determinants of comfort are, they are often not sufficient by themselves. In cooling situations ...
... A building surface influences comfort primarily through its surface temperature; secondarily, a surface can modify air temperature (as when cool air moves across a warm surface). As important as these two determinants of comfort are, they are often not sufficient by themselves. In cooling situations ...
Chapter 19 - Clg Coils
... line approximation is not accurate for many coil processes. A more accurate description of the heat and mass transfer processes is based on the mass transfer relations developed in Section 5.7. An "exact" representation for a cooling coil yields three coupled non-linear differential equations that n ...
... line approximation is not accurate for many coil processes. A more accurate description of the heat and mass transfer processes is based on the mass transfer relations developed in Section 5.7. An "exact" representation for a cooling coil yields three coupled non-linear differential equations that n ...
A Comprehensive Review of Radiant Barrier
... There are three well-established and accepted methods that are used for evaluating the performance of RBs and IRCCs. These are laboratory tests, field studies, and computer simulations. Laboratory tests have the advantage that several parameters, such as roof temperature, "solar" intensity, and air ...
... There are three well-established and accepted methods that are used for evaluating the performance of RBs and IRCCs. These are laboratory tests, field studies, and computer simulations. Laboratory tests have the advantage that several parameters, such as roof temperature, "solar" intensity, and air ...
The suitability of a compact thermosyphon heat
... are needed. Two-phase compact thermosyphon (COTHEX) cooling allows the cooling of higher heat densities without having to resort to using pumps. The standard COTHEX technology, however, cannot replace heatsinks due to their structure because it does not match with the cuboid shape of a heatsink. Thi ...
... are needed. Two-phase compact thermosyphon (COTHEX) cooling allows the cooling of higher heat densities without having to resort to using pumps. The standard COTHEX technology, however, cannot replace heatsinks due to their structure because it does not match with the cuboid shape of a heatsink. Thi ...
laser cooling of solids
... enough entropy-compensating Stokes emission to insure that the luminescence efficiency would be always less than one. This question was first clearly discussed by Pringsheim (1929), who adopted the former position, arguing that a continual cooling of a gas by anti-Stokes scattering is thermodynamica ...
... enough entropy-compensating Stokes emission to insure that the luminescence efficiency would be always less than one. This question was first clearly discussed by Pringsheim (1929), who adopted the former position, arguing that a continual cooling of a gas by anti-Stokes scattering is thermodynamica ...
radiant cooling systems
... counter radiant loads using more cooler air - This requires more air movement, inefficiently countering a high MRT With an air-based system in combination with a radiant cooling system, surface temperatures are naturally lower - This increases the heat emitted from the occupant to cooled surfaces vi ...
... counter radiant loads using more cooler air - This requires more air movement, inefficiently countering a high MRT With an air-based system in combination with a radiant cooling system, surface temperatures are naturally lower - This increases the heat emitted from the occupant to cooled surfaces vi ...
Analyzing the dynamics of brain circuits with
... plates along semiconductor elements. For one direction of current flow, the Peltier effect cools the cold plate and heats up the hot plate. One semiconductor pair (N = 1) is shown. (B) Equivalent thermal circuit for the device shown in (A). The device is attached to a perfect heat sink, represented b ...
... plates along semiconductor elements. For one direction of current flow, the Peltier effect cools the cold plate and heats up the hot plate. One semiconductor pair (N = 1) is shown. (B) Equivalent thermal circuit for the device shown in (A). The device is attached to a perfect heat sink, represented b ...
Review of biomaterial thermal property
... zone. At temperatures below Teut the concentrated liquid will undergo eutectic solidification. It is noted that the temperatures described here are based on conditions when supercooling does not occur. Due to the fact that a solute concentration gradient forms between frozen and unfrozen regions in a ...
... zone. At temperatures below Teut the concentrated liquid will undergo eutectic solidification. It is noted that the temperatures described here are based on conditions when supercooling does not occur. Due to the fact that a solute concentration gradient forms between frozen and unfrozen regions in a ...
Fundamentals of Heat Pipes
... Electronics cooling- small high performance components cause high heat fluxes and high heat dissipation demands. Used to cool transistors and high density semiconductors. ...
... Electronics cooling- small high performance components cause high heat fluxes and high heat dissipation demands. Used to cool transistors and high density semiconductors. ...
Refrigeration And Air Conditioning
... Up to this point we have considered fossil-fueled heat engines that are currently in use. These devices have provided society's answers to the thermodynamic question: How can the chemical energy of fossil fuels be converted into mechanical work and motive power? Let us now turn our attention to the ...
... Up to this point we have considered fossil-fueled heat engines that are currently in use. These devices have provided society's answers to the thermodynamic question: How can the chemical energy of fossil fuels be converted into mechanical work and motive power? Let us now turn our attention to the ...
Heating, Ventilation and Air Conditioning in Smart Energy
... The status in Norway today is a discussion about direct electrical heating vs. central heating systems with water as energy carrier. The main point is the low heat load vs. the higher cost for the central heating system. For local and central heating systems a numerous of components and solutions ar ...
... The status in Norway today is a discussion about direct electrical heating vs. central heating systems with water as energy carrier. The main point is the low heat load vs. the higher cost for the central heating system. For local and central heating systems a numerous of components and solutions ar ...
Wind tower a natural cooling system in Iranian traditional architecture
... One of the shafts operates all the time to receive the breeze and the other three shafts work as outlet air passages. They convey the stuffiness out of the living space through the “flue” (chimney) effect. The chimney effect is based on the principle that the air density increases with the increase ...
... One of the shafts operates all the time to receive the breeze and the other three shafts work as outlet air passages. They convey the stuffiness out of the living space through the “flue” (chimney) effect. The chimney effect is based on the principle that the air density increases with the increase ...
Latent heat storage in buildings
... during the day and then release it again at night. In contrast, the room temperature quickly rises in buildings with low heat capacities, such as lightweight constructions with components made of wood or plasterboard. Protection against heat and cold in buildings is generally the result of a combina ...
... during the day and then release it again at night. In contrast, the room temperature quickly rises in buildings with low heat capacities, such as lightweight constructions with components made of wood or plasterboard. Protection against heat and cold in buildings is generally the result of a combina ...
Heat Illness – A Practical Primer
... min and is the most rapid and ideal method to lower core temperature.17-19 Ice water immersion should be started once heat stroke is discovered and discontinued when the body temperature is 102˚F. Cooling should not be discontinued to transport to the hospital. If ice water immersion is not possible ...
... min and is the most rapid and ideal method to lower core temperature.17-19 Ice water immersion should be started once heat stroke is discovered and discontinued when the body temperature is 102˚F. Cooling should not be discontinued to transport to the hospital. If ice water immersion is not possible ...
1 Pump Characteristic Based Optimization of a Direct Water Cooling
... rectifier (Vienna Rectifier) is under development. Due to preliminary measurements and numerical simulations the total efficiency is assumed to be 95% at full load, resulting in power losses of up to 150W in each multi-chip power module realizing a bridge leg of the rectifier. In order to keep the p ...
... rectifier (Vienna Rectifier) is under development. Due to preliminary measurements and numerical simulations the total efficiency is assumed to be 95% at full load, resulting in power losses of up to 150W in each multi-chip power module realizing a bridge leg of the rectifier. In order to keep the p ...
2007 Sundaram JT
... studies showing the effect of surface roughness on film cooling. Only a few studies exist on the effect of blocked holes on film cooling effectiveness. In addition, there have been few studies simulating the effect of TBC spallation on film cooling effectiveness. Studies concerning the effect of usi ...
... studies showing the effect of surface roughness on film cooling. Only a few studies exist on the effect of blocked holes on film cooling effectiveness. In addition, there have been few studies simulating the effect of TBC spallation on film cooling effectiveness. Studies concerning the effect of usi ...
Cooling tower
A cooling tower is a heat rejection device which rejects waste heat to the atmosphere through the cooling of a water stream to a lower temperature. Cooling towers may either use the evaporation of water to remove process heat and cool the working fluid to near the wet-bulb air temperature or, in the case of closed circuit dry cooling towers, rely solely on air to cool the working fluid to near the dry-bulb air temperature.Common applications include cooling the circulating water used in oil refineries, petrochemical and other chemical plants, thermal power stations and HVAC systems for cooling buildings. The classification is based on the type of air induction into the tower: the main types of cooling towers are natural draft and induced draft cooling towers.Cooling towers vary in size from small roof-top units to very large hyperboloid structures (as in the adjacent image) that can be up to 200 metres (660 ft) tall and 100 metres (330 ft) in diameter, or rectangular structures that can be over 40 metres (130 ft) tall and 80 metres (260 ft) long. The hyperboloid cooling towers are often associated with nuclear power plants, although they are also used to some extent in some large chemical and other industrial plants. Although these large towers are very prominent, the vast majority of cooling towers are much smaller, including many units installed on or near buildings to discharge heat from air conditioning.