Aalborg Universitet Zero Energy Buildings – Design Principles and Built Examples
... C In 2035, it is expected that building energy demand can be covered by renewable energy production integrated in the energy supply system. This might be supplemented by local production on the building. ...
... C In 2035, it is expected that building energy demand can be covered by renewable energy production integrated in the energy supply system. This might be supplemented by local production on the building. ...
Aalborg Universitet Modelling of Natural and Hybrid Ventilation Heiselberg, Per Kvols
... microclimate and the temperature and humidity in the space. Outdoor temperature, humidity and wind velocity are determinant factors for the successful application of natural ventilation techniques. For cooling purposes, the incoming air should be at a lower temperature that the indoor air temperatur ...
... microclimate and the temperature and humidity in the space. Outdoor temperature, humidity and wind velocity are determinant factors for the successful application of natural ventilation techniques. For cooling purposes, the incoming air should be at a lower temperature that the indoor air temperatur ...
resume - Transactions of the Canadian Society for Mechanical
... surface of the part will be subjected to cooling by immersion rapidly into a fluid, normally by either water or specially formulated oil. The main purpose of quenching is to produce the martensitic phase; however steels still need to be tempered after quenching to reduce the residual stresses withou ...
... surface of the part will be subjected to cooling by immersion rapidly into a fluid, normally by either water or specially formulated oil. The main purpose of quenching is to produce the martensitic phase; however steels still need to be tempered after quenching to reduce the residual stresses withou ...
Dry Cooling Technology in Chinese Thermal Power Plants
... large amounts of water through evaporation and high blowdown rates. Dry cooling towers, on the other hand, cools the water to a temperature governed by the ambient air dry bulb temperature. No water is used and therefore the operating costs are lower due to the savings on the cost of water and the w ...
... large amounts of water through evaporation and high blowdown rates. Dry cooling towers, on the other hand, cools the water to a temperature governed by the ambient air dry bulb temperature. No water is used and therefore the operating costs are lower due to the savings on the cost of water and the w ...
Saimaa University of Applied Sciences Faculty of Technology, Lappeenranta
... The use of effective insulation allows reducing the operating costs of a building. High heat performance allows the use of light steel thin-walled structures for economical construction even in the Far North. Gypsum board and insulation - rock wool or ecowool – are usually used as covering for walls ...
... The use of effective insulation allows reducing the operating costs of a building. High heat performance allows the use of light steel thin-walled structures for economical construction even in the Far North. Gypsum board and insulation - rock wool or ecowool – are usually used as covering for walls ...
Heat pump
... The rearrangement of the connections between four ways of flow— compressor suction, compressor discharge, evaporator outlet, and condenser inlet—causes the functions of the indoor and outdoor coils to reverse. It is also called a four-way reversing valve. ...
... The rearrangement of the connections between four ways of flow— compressor suction, compressor discharge, evaporator outlet, and condenser inlet—causes the functions of the indoor and outdoor coils to reverse. It is also called a four-way reversing valve. ...
Thermal performance of buildings with heavy walls
... What emerges is a complex system, with many interactions influencing how heavy exterior walls perform compared with lightweight walls. Kosny et al. have shown that, when both annual heating and annual cooling loads are considered, a heavy wall may perform better than a lightweight wall with more tha ...
... What emerges is a complex system, with many interactions influencing how heavy exterior walls perform compared with lightweight walls. Kosny et al. have shown that, when both annual heating and annual cooling loads are considered, a heavy wall may perform better than a lightweight wall with more tha ...
An Upper Bound for the Critical Boiling Heat Flux
... interfacial structure near the surface. Not much of the heat can flow straight into the liquid without passing through an interface. At the higher pressures, however, pghfg increases, so less vapor volume is generated at a given heat flux. It is very probable that more of the heat finds a less effi ...
... interfacial structure near the surface. Not much of the heat can flow straight into the liquid without passing through an interface. At the higher pressures, however, pghfg increases, so less vapor volume is generated at a given heat flux. It is very probable that more of the heat finds a less effi ...
Chapter 19 - Clg Coils
... the same form as those for sensible heat exchangers to produce an analogy solution that can be directly solved to yield a simple but accurate representation of coil performance. A description of the processes that occur inside a cooling coil is important to the formulation of the heat and mass trans ...
... the same form as those for sensible heat exchangers to produce an analogy solution that can be directly solved to yield a simple but accurate representation of coil performance. A description of the processes that occur inside a cooling coil is important to the formulation of the heat and mass trans ...
Heat stress in mining
... Invisible loss of water through the skin without involvement of the sweat glands (Strang and Mackenzie-Wood, 1990: 360). The two most significant environmental factors that affect evaporation in an underground mine are humidity and air speed (Brake et al, 1998: 2). At humidity levels less than 100% ...
... Invisible loss of water through the skin without involvement of the sweat glands (Strang and Mackenzie-Wood, 1990: 360). The two most significant environmental factors that affect evaporation in an underground mine are humidity and air speed (Brake et al, 1998: 2). At humidity levels less than 100% ...
Thermal Performance of Rooftop Greenery system in Tropical
... the thermal performance of the rooftop greenery system in topical climate of Malaysia. In various studies, neutrality temperature is defined as the temperature that gives a thermal experience neither warm nor cool, which is a state of “neutral” or “comfortable”. It is the mid point of the comfort zo ...
... the thermal performance of the rooftop greenery system in topical climate of Malaysia. In various studies, neutrality temperature is defined as the temperature that gives a thermal experience neither warm nor cool, which is a state of “neutral” or “comfortable”. It is the mid point of the comfort zo ...
Environmental Design and Inspection Services
... Richard went on to say that what is even more startling is that only 1% of the nation’s developers are catering specifically to this market. He pointed out that this means that 99% of developers are chasing after 76% of the market, while only 1% are pursuing upwards of 26% of the market. It is a wel ...
... Richard went on to say that what is even more startling is that only 1% of the nation’s developers are catering specifically to this market. He pointed out that this means that 99% of developers are chasing after 76% of the market, while only 1% are pursuing upwards of 26% of the market. It is a wel ...
Thermal Performance of Tropical Atrium
... deeper daylight to bring the pleasantinternal spaces while reducing proper conditions for achieving thermal comfort [6]. Also in tropical climates, excessive solar radiation through glazed surfaces may worsen internal thermal conditions especially during working hours [7]. The overheating issue is n ...
... deeper daylight to bring the pleasantinternal spaces while reducing proper conditions for achieving thermal comfort [6]. Also in tropical climates, excessive solar radiation through glazed surfaces may worsen internal thermal conditions especially during working hours [7]. The overheating issue is n ...
merino for performance activewear
... intrinsically linked. To illustrate this, consider the case of active sportswear. Such apparel should ideally support the thermoregulation of the athlete by promoting evaporative heat transmission (Pessenhofer et al. 1991). Such heat transmission arises through conversion of liquid sweat to water va ...
... intrinsically linked. To illustrate this, consider the case of active sportswear. Such apparel should ideally support the thermoregulation of the athlete by promoting evaporative heat transmission (Pessenhofer et al. 1991). Such heat transmission arises through conversion of liquid sweat to water va ...
Boiling Heat Transfer Characteristics of Immiscible Liquid Mixtures
... water are selected as components of the test mixture. Figure 2 shows the images of liquid layers for the immiscible liquid mixtures, where the heights H1 and H2 are varied as one of important parameters. Once nucleate boiling occurs, the liquidliquid interface cannot be smooth but the complex mixing ...
... water are selected as components of the test mixture. Figure 2 shows the images of liquid layers for the immiscible liquid mixtures, where the heights H1 and H2 are varied as one of important parameters. Once nucleate boiling occurs, the liquidliquid interface cannot be smooth but the complex mixing ...
Título del Trabajo a Presentar en el XV Congreso Nacional
... ii. CFD simulations of this prototype were conducted using all the assumptions/simplifications listed later in this paper. iii. Static pressures were measured at multiple locations in the prototype device and compared with CFD predictions. Agreement between experiment and CFD provided confidence in ...
... ii. CFD simulations of this prototype were conducted using all the assumptions/simplifications listed later in this paper. iii. Static pressures were measured at multiple locations in the prototype device and compared with CFD predictions. Agreement between experiment and CFD provided confidence in ...
A Comprehensive Review of Radiant Barrier
... cooling and heating degree days (base 65oF), climatic zone (see Figure 2 below), ventilation type (i.e., natural or forced ventilation and vent arrangement), whether the building was occupied during the testing period, and whether the air handlers and ducts were located in the attics. In addition, a ...
... cooling and heating degree days (base 65oF), climatic zone (see Figure 2 below), ventilation type (i.e., natural or forced ventilation and vent arrangement), whether the building was occupied during the testing period, and whether the air handlers and ducts were located in the attics. In addition, a ...
Diapositive 1
... Assuming that the chip power is 25 µW/channel total power to dissipate will be : 2055 W external cooling OK inside each slab : necessity of cooling system but active or passive ? Ex: Pessimist simulation of heat conduction just by the heat shield : λ = 400 W/m/K (copper) ; S = 124*0,4 mm2 L = 1,55 ...
... Assuming that the chip power is 25 µW/channel total power to dissipate will be : 2055 W external cooling OK inside each slab : necessity of cooling system but active or passive ? Ex: Pessimist simulation of heat conduction just by the heat shield : λ = 400 W/m/K (copper) ; S = 124*0,4 mm2 L = 1,55 ...
Heat Sink Performance Testing
... vinyl tubing. At the end of the wind tunnel, the axial fan is attached using tape. While attaching the fan, direction of the rotation of blade and air flow direction are important. Rotation of the fan blades should be in anti-clockwise direction when facing to the fan. The direction of the air flow ...
... vinyl tubing. At the end of the wind tunnel, the axial fan is attached using tape. While attaching the fan, direction of the rotation of blade and air flow direction are important. Rotation of the fan blades should be in anti-clockwise direction when facing to the fan. The direction of the air flow ...
chapter 11 - Description
... 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, air motion and relative humidity are significant comfort determinants. For most ...
... 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, air motion and relative humidity are significant comfort determinants. For most ...
radiant cooling - Energy Design Resources
... of several lines of hydronic radiant panels that may be used for heating or Figure 6: Principal types of hydronic radiant cooling systems A core-cooled ceiling (left) is the cooling equivalent of a floor heating system. In this system, water is circulated through plastic tubes embedded in the core o ...
... of several lines of hydronic radiant panels that may be used for heating or Figure 6: Principal types of hydronic radiant cooling systems A core-cooled ceiling (left) is the cooling equivalent of a floor heating system. In this system, water is circulated through plastic tubes embedded in the core o ...
Document
... Abstract. Early design decisions with regard to building facade characteristics play a significant role in the resulting building's thermal performance. In this context, external metal mesh screens used as a permanent second facade skin- are a rather new shading alternative, particularly in nonresid ...
... Abstract. Early design decisions with regard to building facade characteristics play a significant role in the resulting building's thermal performance. In this context, external metal mesh screens used as a permanent second facade skin- are a rather new shading alternative, particularly in nonresid ...
Architectural Styles Survey in Palestinian Territories
... 1- Climatic Design Consideration In West Bank and Gaza Strip Climate of West Bank and Gaza Strip The climate of the Palestinian Territories is influenced by the Mediterranean climate where long, hot, dry summer and short, cool, rainy winter climate conditions prevail. Climatic variations occur in t ...
... 1- Climatic Design Consideration In West Bank and Gaza Strip Climate of West Bank and Gaza Strip The climate of the Palestinian Territories is influenced by the Mediterranean climate where long, hot, dry summer and short, cool, rainy winter climate conditions prevail. Climatic variations occur in t ...
Heat transfer and air flow in a domestic refrigerator
... zones. The brewed type is a static refrigerator equipped with a fan (Figure 16.1b). It allows air circulation and the temperature decreases rapidly after door opening. Air temperature is more homogeneous in this case than in the static type but the energy consumption is higher due to the fan. In a n ...
... zones. The brewed type is a static refrigerator equipped with a fan (Figure 16.1b). It allows air circulation and the temperature decreases rapidly after door opening. Air temperature is more homogeneous in this case than in the static type but the energy consumption is higher due to the fan. In a n ...
Convective heat transfer for fluids passing through
... over 90%. Additionally, the sizes and the number of ‘windows’ between individual cells are sufficiently high to enable a relatively unobstructed flow of fluids through the cellular space. That reduces the loss of pressure and hence the energy required to pass the fluid through that structure. In cas ...
... over 90%. Additionally, the sizes and the number of ‘windows’ between individual cells are sufficiently high to enable a relatively unobstructed flow of fluids through the cellular space. That reduces the loss of pressure and hence the energy required to pass the fluid through that structure. In cas ...
HVAC
HVAC (heating, ventilating, and air conditioning; also heating, ventilation, and air conditioning) is the technology of indoor and vehicular environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, or ventilating is dropped as in HACR (such as the designation of HACR-rated circuit breakers).HVAC is important in the design of medium to large industrial and office buildings such as skyscrapers and in marine environments such as aquariums, where safe and healthy building conditions are regulated with respect to temperature and humidity, using fresh air from outdoors.Ventilating or ventilation (the V in HVAC) is the process of ""exchanging"" or replacing air in any space to provide high indoor air quality which involves temperature control, oxygen replenishment, and removal of moisture, odors, smoke, heat, dust, airborne bacteria, and carbon dioxide. Ventilation removes unpleasant smells and excessive moisture, introduces outside air, keeps interior building air circulating, and prevents stagnation of the interior air.Ventilation includes both the exchange of air to the outside as well as circulation of air within the building. It is one of the most important factors for maintaining acceptable indoor air quality in buildings. Methods for ventilating a building may be divided into mechanical/forced and natural types.