Criteria for the Passive House, EnerPHit and PHI Low Energy
... alternative to these two criteria, evidence for the Passive House Classic Standard can continue to be provided in a transitional phase by proving compliance with the previous requirement for the non-renewable primary energy demand (PE) of QP ≤ 120 kWh/(m²a). PHI may specify other national values bas ...
... alternative to these two criteria, evidence for the Passive House Classic Standard can continue to be provided in a transitional phase by proving compliance with the previous requirement for the non-renewable primary energy demand (PE) of QP ≤ 120 kWh/(m²a). PHI may specify other national values bas ...
Aluminum and Stainless Steel Heat Exchangers in - Weil
... extracts additional heat from the exhaust gases by condensing its hot water vapor (steam) to liquid water, thus recovering its latent heat of vaporization. By capturing some of the waste heat, the condensing boiler heat exchanger has the potential to be 10-15% more efficient than a conventional boil ...
... extracts additional heat from the exhaust gases by condensing its hot water vapor (steam) to liquid water, thus recovering its latent heat of vaporization. By capturing some of the waste heat, the condensing boiler heat exchanger has the potential to be 10-15% more efficient than a conventional boil ...
Passivhaus primer: Airtightness Guide
... Air leakage through gaps in a building’s envelope can be caused by either the buoyancy effect of air or by the pressure differential created by wind blowing on a building. Typically both of these factors will influence the total rate of air leakage at a given point in time. Buoyancy: As air warms up ...
... Air leakage through gaps in a building’s envelope can be caused by either the buoyancy effect of air or by the pressure differential created by wind blowing on a building. Typically both of these factors will influence the total rate of air leakage at a given point in time. Buoyancy: As air warms up ...
lec13-problems-solutions
... • It is given that the heat transfer from the system is Q = -37.6 kJ • Therefore, -37.6 = ΔU – 15.75 or, ΔU = -21.85 kJ • The change in internal energy of the gas is -21.85 kJ (decrease in internal energy during the process) ...
... • It is given that the heat transfer from the system is Q = -37.6 kJ • Therefore, -37.6 = ΔU – 15.75 or, ΔU = -21.85 kJ • The change in internal energy of the gas is -21.85 kJ (decrease in internal energy during the process) ...
A method for optimization of plate heat exchanger
... design theory of plate heat exchangers, as a tool to increase heat recovery and efficiency of energy usage. The optimal design of a multi-pass plate-and-frame heat exchanger with mixed grouping of plates was considered. The optimizing variables included the number of passes for both streams, the num ...
... design theory of plate heat exchangers, as a tool to increase heat recovery and efficiency of energy usage. The optimal design of a multi-pass plate-and-frame heat exchanger with mixed grouping of plates was considered. The optimizing variables included the number of passes for both streams, the num ...
Fundamentals of Heat Pipes
... Cooling of electronics has one primary goal: maintain a component’s temperatures at or below the manufacturer’s maximum allowable temperature. As the temperature of an electronic part increases the rate of failure increases. ...
... Cooling of electronics has one primary goal: maintain a component’s temperatures at or below the manufacturer’s maximum allowable temperature. As the temperature of an electronic part increases the rate of failure increases. ...
Methods of Increasing Net Work Output of Organic - Purdue e-Pubs
... In heat engine design, the usual objective is to maximize thermal efficiency. However, for heat engines applied to waste heat recovery, an appropriate objective is to maximize power production by converting as much of the waste heat as possible into work. An organic Rankine cycle (ORC) is particular ...
... In heat engine design, the usual objective is to maximize thermal efficiency. However, for heat engines applied to waste heat recovery, an appropriate objective is to maximize power production by converting as much of the waste heat as possible into work. An organic Rankine cycle (ORC) is particular ...
... incorporating energy improvements into their construction or renovation plans, schools can significantly reduce energy consumption and costs. These savings can then be redirected to educational needs such as additional teachers, instructional materials, or new computers. The U.S. Department of Energ ...
Application and Solution of the Heat Equation in One
... working equation we derive is a partial differential equation. The problem is that most of us have not had any instruction in how to deal with partial differential equations (PDEs). It becomes difficult to get a feel for heat transfer when we lack the mathematical tools to tackle even the most basic ...
... working equation we derive is a partial differential equation. The problem is that most of us have not had any instruction in how to deal with partial differential equations (PDEs). It becomes difficult to get a feel for heat transfer when we lack the mathematical tools to tackle even the most basic ...
Heat Conduction
... Understand multidimensionality and time dependence of heat transfer, and the conditions under which a heat transfer problem can be approximated as being one-dimensional, Obtain the differential equation of heat conduction in various coordinate systems, and simplify it for steady one-dimensional ...
... Understand multidimensionality and time dependence of heat transfer, and the conditions under which a heat transfer problem can be approximated as being one-dimensional, Obtain the differential equation of heat conduction in various coordinate systems, and simplify it for steady one-dimensional ...
DESIGN AND ANALYSIS OF A NET
... As concerns over energy independence in the United States and global warming increase well into the 21st century, many are seeking ways to continually increase energy efficiency and reduce energy consumption. Commercial and residential buildings alone account for 40% of primary energy consumption in ...
... As concerns over energy independence in the United States and global warming increase well into the 21st century, many are seeking ways to continually increase energy efficiency and reduce energy consumption. Commercial and residential buildings alone account for 40% of primary energy consumption in ...
Exhaust Ventilation and Radon Induction in a Subarctic Climate
... essential that we control the flows of heat, air, and moisture into and out of those homes. Experience with residential buildings in the great natural laboratory of Interior Alaska has led the authors to h l l y appreciate thc hnctional relationship of these three aspects of indoor comfort and healt ...
... essential that we control the flows of heat, air, and moisture into and out of those homes. Experience with residential buildings in the great natural laboratory of Interior Alaska has led the authors to h l l y appreciate thc hnctional relationship of these three aspects of indoor comfort and healt ...
GAS MIXTURES AND PSYCHROMETRICS Up
... substance. Therefore, it is important to develop an understanding of mixtures and learn how to handle them. In this chapter, we deal with nonreacting gas mixtures. A nonreacting gas mixture can be treated as a pure substance since it is usually a homogeneous mixture of different gases. The propertie ...
... substance. Therefore, it is important to develop an understanding of mixtures and learn how to handle them. In this chapter, we deal with nonreacting gas mixtures. A nonreacting gas mixture can be treated as a pure substance since it is usually a homogeneous mixture of different gases. The propertie ...
chapter 21 thermodynamics
... In an adiabatic process, heat is neither absorbed nor emitted from a system; Q = 0. Since work is being done on the gas instead of by the gas, the internal energy of the system increases ∆E = Q − W = −W Since work is done on the gas, the work done has a negative value and the internal energy is incr ...
... In an adiabatic process, heat is neither absorbed nor emitted from a system; Q = 0. Since work is being done on the gas instead of by the gas, the internal energy of the system increases ∆E = Q − W = −W Since work is done on the gas, the work done has a negative value and the internal energy is incr ...
Film Cooling Characteristics of a Single Round Hole at
... This high pressure air bypasses the combustor section of the engine and is maintained at much lower temperatures than the core turbine flow. This bled-off air, however, is removed from the core mass flow and subtracts from the overall thrust of the engine. Obviously, the engine designer wants to min ...
... This high pressure air bypasses the combustor section of the engine and is maintained at much lower temperatures than the core turbine flow. This bled-off air, however, is removed from the core mass flow and subtracts from the overall thrust of the engine. Obviously, the engine designer wants to min ...
Modelling of Phase Change Material Implemented - Purdue e-Pubs
... and temperature distribution in a refrigerated truck. Xie et al (2006) used a CFD package to simulate the velocity and temperature field in a 2D plane through a cold store. Hoang et al (2000) constructed a 3D model of a cold store using a commercial CFD package and modelled the air flow in the cold ...
... and temperature distribution in a refrigerated truck. Xie et al (2006) used a CFD package to simulate the velocity and temperature field in a 2D plane through a cold store. Hoang et al (2000) constructed a 3D model of a cold store using a commercial CFD package and modelled the air flow in the cold ...
ch1010 heat transfer unit i heat conduction
... boundary is very large when compared to the internal resistance due to conduction. In other words, the solid has an infinite thermal conductivity so that there is no variation of temperature inside the solid and temperature is a function of time only. This situation cannot exist in reality because a ...
... boundary is very large when compared to the internal resistance due to conduction. In other words, the solid has an infinite thermal conductivity so that there is no variation of temperature inside the solid and temperature is a function of time only. This situation cannot exist in reality because a ...
Modeling with finite element the convective heat transfer in civil
... use of thermal insulation in buildings enhances thermal comfort at less operating cost. However, the magnitude of energy savings as a result of using thermal insulation vary according to the building type, the climatic conditions at which the building is located as well as the type, thickness and lo ...
... use of thermal insulation in buildings enhances thermal comfort at less operating cost. However, the magnitude of energy savings as a result of using thermal insulation vary according to the building type, the climatic conditions at which the building is located as well as the type, thickness and lo ...
CALORPLAST Heat Exchangers
... mechanical joints which can in other exchanger designs be weak spots subject to chemical attack and stress cracking. CALORPLAST is constructed of modular elements which enable the heat exchanger to be adapted to suit a ...
... mechanical joints which can in other exchanger designs be weak spots subject to chemical attack and stress cracking. CALORPLAST is constructed of modular elements which enable the heat exchanger to be adapted to suit a ...
Criteria for the Passive House, EnerPHit and PHI Low Energy
... transitional phase by proving compliance with the previous requirement for the non-renewable primary energy demand (PE) of QP ≤ 120 kWh/(m²a). The desired verification method can be selected in the PHPP worksheet "Verification". The primary energy factor profile 1 in the PHPP should be used by defau ...
... transitional phase by proving compliance with the previous requirement for the non-renewable primary energy demand (PE) of QP ≤ 120 kWh/(m²a). The desired verification method can be selected in the PHPP worksheet "Verification". The primary energy factor profile 1 in the PHPP should be used by defau ...
Dynamic Modeling and Control Strategies for a
... vapor saturation curve and the super-atmospheric saturation pressures of some organic fluids preclude the need for superheating and the removal of non-condensable gases, respectively, used in steam Rankine cycles, reducing the complexity, cost, and maintenance requirements [12]. Coupling micro-CSP p ...
... vapor saturation curve and the super-atmospheric saturation pressures of some organic fluids preclude the need for superheating and the removal of non-condensable gases, respectively, used in steam Rankine cycles, reducing the complexity, cost, and maintenance requirements [12]. Coupling micro-CSP p ...
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 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. ...
Heat - Quia
... Theuse units for Q, t must in joules, calories, consistent and andm with mmust must those be bein based ingrams. kilograms. on the value of the constant c. ...
... Theuse units for Q, t must in joules, calories, consistent and andm with mmust must those be bein based ingrams. kilograms. on the value of the constant c. ...
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.