MECHANICAL AND ELECTRICAL EQUIPMENTS
... - energy conservation have reduced the air circulation rate in many central air handling systems moving less air reduces the energy used by fans. One result can be low distribution efficiency, which causes poorly mixed air within the occupied spaces. With local (individual space) air filtering equip ...
... - energy conservation have reduced the air circulation rate in many central air handling systems moving less air reduces the energy used by fans. One result can be low distribution efficiency, which causes poorly mixed air within the occupied spaces. With local (individual space) air filtering equip ...
First Progress Report.pdf
... Several investigations and studies have been completed concerning the subject of materials for TE devices and recovering waste heat as a green energy source. Thermoelectric technology is used in countless applications to power small electronics, or harness enough energy from large heat producing sou ...
... Several investigations and studies have been completed concerning the subject of materials for TE devices and recovering waste heat as a green energy source. Thermoelectric technology is used in countless applications to power small electronics, or harness enough energy from large heat producing sou ...
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-ISSN: 2278-1684
... techniques. Mechanically assisted cooling sub systems provide active cooling. Active cooling technique offer high cooling capacity. They allow temperature control that can cool below ambient temperatures. In most cases active cooling techniques eliminate the use of cooling fans or they require less ...
... techniques. Mechanically assisted cooling sub systems provide active cooling. Active cooling technique offer high cooling capacity. They allow temperature control that can cool below ambient temperatures. In most cases active cooling techniques eliminate the use of cooling fans or they require less ...
Thermal Analysis of Heat Transfer Enhancement
... Numerical analysis of thermal enhancement for a single Proton Exchange Membrane Fuel Cell (PEMFC) cooling plate is presented in this paper. A low concentration of Al2O3 in Water - Ethylene Glycol mixtures was used as coolant in 220mm x 300mm cooling plate with 22 parallel mini channels of 1 x 5 x 10 ...
... Numerical analysis of thermal enhancement for a single Proton Exchange Membrane Fuel Cell (PEMFC) cooling plate is presented in this paper. A low concentration of Al2O3 in Water - Ethylene Glycol mixtures was used as coolant in 220mm x 300mm cooling plate with 22 parallel mini channels of 1 x 5 x 10 ...
sustainable buildings in hot and dry climate of india
... air from the surrounding countryside flows towards the centre. This kind of circulation is more pronounced on calm summer nights and can be utilized to flush dense areas of heat and pollutants. To achieve cool air movement, a belt of undeveloped and preferably vegetated land at the perimeter of the ...
... air from the surrounding countryside flows towards the centre. This kind of circulation is more pronounced on calm summer nights and can be utilized to flush dense areas of heat and pollutants. To achieve cool air movement, a belt of undeveloped and preferably vegetated land at the perimeter of the ...
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 ...
Cooling Rate Calculation of Non-Equilibrium
... proposed, and a simply theoretical model leads to excellent agreement between the simulation and experimental results. ...
... proposed, and a simply theoretical model leads to excellent agreement between the simulation and experimental results. ...
Word Document
... are usually made of a metal with high thermal conductivity such as aluminum or copper, and incorporate fins to increase surface area. Heat from a relatively small component is transferred to the larger heat sink; the equilibrium temperature of the component plus heat sink is much lower than the comp ...
... are usually made of a metal with high thermal conductivity such as aluminum or copper, and incorporate fins to increase surface area. Heat from a relatively small component is transferred to the larger heat sink; the equilibrium temperature of the component plus heat sink is much lower than the comp ...
Paper
... ribbon production. It is well known that the cooling rate of the ribbon on the drum must be high enough to achieve the amorphous solidification. The previous estimations showed that the average cooling rate must range 105 K/s to 106 K/s [3]. Theoretical analysis of heat transfer in this case is comp ...
... ribbon production. It is well known that the cooling rate of the ribbon on the drum must be high enough to achieve the amorphous solidification. The previous estimations showed that the average cooling rate must range 105 K/s to 106 K/s [3]. Theoretical analysis of heat transfer in this case is comp ...
Building envelope design as a passive cooling technique
... to the outside, admit daylight and/or solar energy for heating, and supply natural ventilation. The form, size, and location of the openings vary depending upon the role they play in the building envelope. Window glazing can be used to affect heating and cooling requirements and occupant comfort by ...
... to the outside, admit daylight and/or solar energy for heating, and supply natural ventilation. The form, size, and location of the openings vary depending upon the role they play in the building envelope. Window glazing can be used to affect heating and cooling requirements and occupant comfort by ...
Optimum cooling solutions for power electronics, Robert Skuriat
... A number of trade-offs and compromises are found once the complete system is analysed: ...
... A number of trade-offs and compromises are found once the complete system is analysed: ...
Introduction
... from the thermodynamics course that they are often used for heat removal in power generation cycles. Undoubtedly more are used in air conditioning cycles than any place else. (Next time you are in a tall city building, look below and you’ll probably see dozens of them on the rooftops of lower buildi ...
... from the thermodynamics course that they are often used for heat removal in power generation cycles. Undoubtedly more are used in air conditioning cycles than any place else. (Next time you are in a tall city building, look below and you’ll probably see dozens of them on the rooftops of lower buildi ...
Thermal Management of High Power in Small Spaces
... involving system level thermal management and cooling need to be challenged to ensure a valid overall packaged system solution that meets the overall function and environmental requirements. These misconceptions and myths arose when today’s decision makers were just entering the electronics packagin ...
... involving system level thermal management and cooling need to be challenged to ensure a valid overall packaged system solution that meets the overall function and environmental requirements. These misconceptions and myths arose when today’s decision makers were just entering the electronics packagin ...
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 ...
Film Cooling Characteristics of a Single Round Hole at
... experimentally on Film cooling effectiveness in a flat plate test facility with zero pressure gradient using a single row of inclined holes, which injected high-density, cryogenically cooled air (D. L. Schmidt et al, 1996). G E. Andrews et al. were described experimental techniques for the determina ...
... experimentally on Film cooling effectiveness in a flat plate test facility with zero pressure gradient using a single row of inclined holes, which injected high-density, cryogenically cooled air (D. L. Schmidt et al, 1996). G E. Andrews et al. were described experimental techniques for the determina ...
HEAT GAIN CALCULATIONS
... required in kWh to cover the period in question is just: • A×U×D×24/1000 ...
... required in kWh to cover the period in question is just: • A×U×D×24/1000 ...
434 kB 15 September, 2015 IEE Total Concept
... building will be used during the renovation. Due to this reason the package cannot be implemented at once but those measures which can be carried out wihtout disturbing the use of the building will be implemented during the renovation. The rest of the measures will be divided between the upcoming ye ...
... building will be used during the renovation. Due to this reason the package cannot be implemented at once but those measures which can be carried out wihtout disturbing the use of the building will be implemented during the renovation. The rest of the measures will be divided between the upcoming ye ...
Coupled thermal-structural modeling
... implicit Colebrook-White equation for smooth pipes, f ≈ 0.037 ...
... implicit Colebrook-White equation for smooth pipes, f ≈ 0.037 ...
CHAPTER 14: Heat Answers to Questions 1. The work goes
... convective currents to be able to completely circulate. If the flow of air is blocked, then the convective currents and the heating process will be interrupted. Heating will be less efficient and less uniform if the convective currents are prevented from circulating. 16. A ceiling fan makes more of ...
... convective currents to be able to completely circulate. If the flow of air is blocked, then the convective currents and the heating process will be interrupted. Heating will be less efficient and less uniform if the convective currents are prevented from circulating. 16. A ceiling fan makes more of ...
The Gettysburg National Military Park Museum and Visitor Center
... flow and then into the condenser hot water loop. The chillers’ energy efficiency ratio (EER) is 30 and the heating coefficient of performance (COP) is 5.5. These are the nominal cooling and heating efficiencies, which vary with the building loads and the geothermal water temperatures. Designing the ...
... flow and then into the condenser hot water loop. The chillers’ energy efficiency ratio (EER) is 30 and the heating coefficient of performance (COP) is 5.5. These are the nominal cooling and heating efficiencies, which vary with the building loads and the geothermal water temperatures. Designing the ...
Aalborg Universitet Heiselberg, Per Kvols
... hold the humidity and store the water on the wall. When sun is effective evaporation of this water will cool down the wall and this will decrease the heat gain from the wall. This is one of the effective method to reducing the cooling load for hot and rainy climates [7]. Another effective indirect a ...
... hold the humidity and store the water on the wall. When sun is effective evaporation of this water will cool down the wall and this will decrease the heat gain from the wall. This is one of the effective method to reducing the cooling load for hot and rainy climates [7]. Another effective indirect a ...
Problem set #1
... 2.1 The overhead vapor from a depropanizer distillation column is totally condensed in a water-cooled condenser at 120oF and 227 psig. The vapor is 95 mol % propane and 5 mol % isobutene. The vapor design flow rate is 25,500 lb/h and average latent heat of vaporization is 125 Btu/lb. Cooling water ...
... 2.1 The overhead vapor from a depropanizer distillation column is totally condensed in a water-cooled condenser at 120oF and 227 psig. The vapor is 95 mol % propane and 5 mol % isobutene. The vapor design flow rate is 25,500 lb/h and average latent heat of vaporization is 125 Btu/lb. Cooling water ...
Radiant Cooling: Thermally Active Floors
... For hydronic transport to be successful, the coupling between the transport medium, and the space must be maximized. To maximize this coupling, radiant conditioning systems often use the most extensive surfaces in the building, the floor and the ceiling. These surfaces have the advantage of convecti ...
... For hydronic transport to be successful, the coupling between the transport medium, and the space must be maximized. To maximize this coupling, radiant conditioning systems often use the most extensive surfaces in the building, the floor and the ceiling. These surfaces have the advantage of convecti ...
Simulation of intermittent transient cooling load characteristic in an academic
... Abstract— This paper aims to estimate intermittent transient cooling load characteristics in an academic building with large glazing area using TRNSYS. Simulation and experimental studies have been done in the past to estimate cooling load characteristic and to find strategies to reduce the energy u ...
... Abstract— This paper aims to estimate intermittent transient cooling load characteristics in an academic building with large glazing area using TRNSYS. Simulation and experimental studies have been done in the past to estimate cooling load characteristic and to find strategies to reduce the energy u ...
Vėsinimo apkrovos skaičiavimas
... The heat gain or heat loss through a building depends on: a. The temperature difference between outside temperature and our desired temperature. b. The type of construction and the amount of insulation is in your ceiling and walls. Let's say, that you have two identical buildings, one is build out o ...
... The heat gain or heat loss through a building depends on: a. The temperature difference between outside temperature and our desired temperature. b. The type of construction and the amount of insulation is in your ceiling and walls. Let's say, that you have two identical buildings, one is build out o ...
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.