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Quantity relating heat flux and temperature difference
thermodynamics, the heat transfer coefficient or film coefficient, or film effectiveness, is the proportionality constant between the heat flux and the thermodynamic
Heat_transfer_coefficient
Heat transfer due to the movement of fluid
heat transfer) is the transfer of heat from one place to another due to the movement of fluid. Although often discussed as a distinct method of heat transfer
Convection_(heat_transfer)
Type of chemical mixture
causes a decrease in the resistance to heat transfer. Thus, more heat is transferred and the heat transfer coefficient is higher at the top of the film. The
Zeotropic_mixture
Physical law relating heat loss to temperature difference
proportional relationship is called heat transfer coefficient. The law applies only when the nature of heat transfer mechanism (convection or conduction)
Newton's_law_of_cooling
Study of hydraulic flow in thermal fluids
single-phase heat transfer, heat transfer with a phase change is an effective way of heat transfer. It generally has high value of heat transfer coefficient due
Thermal_hydraulics
Exchange of mass, energy, and momentum between observed and studied systems
temperature driving force, Q is the heat flow per unit time, and h is the heat transfer coefficient. Within heat transfer, two principal types of convection
Transport_phenomena
Nondimensional heat transfer coefficient
is a nondimensionalization of the convective heat transfer coefficient. Like the heat transfer coefficient, the Nusselt number may be defined locally,
Nusselt_number
Method of calculating heat transfer in flow systems
exchanger. For a given heat exchanger with constant area and heat transfer coefficient, the larger the LMTD, the more heat is transferred. The use of the LMTD
Logarithmic mean temperature difference
Logarithmic_mean_temperature_difference
Steam whose temperature can be decreased without immediately condensing
saturated steam, its heat content is much less useful. This is because superheated steam has the same heat transfer coefficient of air, making it an insulator
Superheated_steam
Temperature for heat exchange
{\displaystyle h_{c}} = convective heat transfer coefficient h r {\displaystyle h_{r}} = linear radiative heat transfer coefficient t a {\displaystyle t_{a}} =
Operative_temperature
Type of boiling
increasing the convective heat transfer coefficient and the heat flux. In this regime, most of the heat transfer is through direct transfer from the surface to
Nucleate_boiling
Topics referred to by the same term
Transfer coefficient may refer to: Heat transfer coefficient Mass transfer coefficient Charge transfer coefficient Transfer coefficients which take the
Transfer_coefficient
Industrial device
the outside of the tubes. High heat transfer coefficients are required in order to achieve equally balanced heat transfer resistances. Therefore, condensing
Falling_film_evaporator
Heat-transfer device that employs phase transition
and the cycle repeats. Due to the very high heat-transfer coefficients for boiling and condensation, heat pipes are highly effective thermal conductors
Heat_pipe
Graphs for analyzing 1–D conductive heat transfer
surroundings and the convective heat transfer coefficient must remain constant and uniform. Also, there must be no heat generation from the body itself
Heisler_chart
Container that controls temperature of contents
very inefficient for heat transfer because the flow media has an extremely low velocity resulting in a low heat transfer coefficient. Condensing media,
Jacketed_vessel
Process of increasing the effectiveness of heat exchangers
Heat transfer enhancement is the process of increasing the effectiveness of heat exchangers. This can be achieved when the heat-transfer power of a given
Heat_transfer_enhancement
Surface that extends from an object to increase heat transfer
of heat it transfers. Increasing the temperature gradient between the object and the environment, increasing the convection heat transfer coefficient, or
Fin_(extended_surface)
since the alternative way of doing so is by increasing either the heat transfer coefficient (which depends on the nature of materials being used and the conditions
Heat_transfer_through_fins
the overall heat transfer rate is, where Q is the heat transfer Rate U is the overall heat transfer coefficient A is the overall heat transfer area Tlm is
Rising_film_evaporator
Heat required to raise the temperature of a given unit of mass of a substance
(latent heat of melting) Enthalpy of vaporization (latent heat of vaporization) Frenkel line Heat capacity ratio Heat equation Heat transfer coefficient History
Specific_heat_capacity
Fluid-flow-directing vane or panel
the tube field. This increases fluid velocity and the effective heat transfer coefficient of the exchanger In a static mixer, baffles are used to minimize
Baffle_(heat_transfer)
System for condensing gas into liquid by cooling
heat transfer, a condenser is a heat exchanger used to condense a gaseous substance into a liquid state through cooling. In doing so, the latent heat
Condenser_(heat_transfer)
German mechanical engineer and professor (1882–1957)
the heat transfer coefficient near the inlet, and he noted that this variation directly affected existing measurements of heat transfer coefficients. (Nusselt
Wilhelm_Nusselt
Variable to calculate cooling load of a building
q} = rate of heat transfer [W] A {\displaystyle A} = heat transfer surface area [m2] h o {\displaystyle h_{o}} = heat transfer coefficient for radiation
Sol-air_temperature
heat flux to temperature difference with heat transfer coefficient which was the only tool in theoretical heat convection since the times of Newton. This
Conjugate convective heat transfer
Conjugate_convective_heat_transfer
Equation in convective heat transfer
convective heat transfer coefficient. Newton's law of cooling (in the form of heat loss per surface area being equal to heat transfer coefficient multiplied
Churchill–Bernstein_equation
Method of reusing thermal energy in a building
heat recovery ventilator (HRV) can only transfer sensible heat. HRVs can be considered sensible only devices because they only exchange sensible heat
Heat_recovery_ventilation
Device that tends to equalize temperature over its surface
heat transfer coefficient than if it were liquid-cooled. A high enough heat exchanger transfer coefficient is sufficient to avoid the need for a heat
Heat_spreader
Solar energy effect
design methods have moved away from the Shading Coefficient and towards the Solar Heat Gain Coefficient (SHGC), which is defined as the fraction of incident
Solar_gain
Thermal engineering discipline concerning transfer of heat in physical systems
Thermodynamic and mechanical heat transfer is calculated with the heat transfer coefficient, the proportionality between the heat flux and the thermodynamic
Heat_transfer
Heat exchanger that uses metal plates to transfer heat between two fluids
A plate heat exchanger is a type of heat exchanger that uses metal plates to transfer heat between two fluids. This has a major advantage over a conventional
Plate_heat_exchanger
Equipment used to transfer heat between fluids
A heat exchanger is a system used to transfer heat between a source and a working fluid. Heat exchangers are used in both cooling and heating processes
Heat_exchanger
Analogy in fluid dynamics
friction factor; h {\displaystyle h} is the heat transfer coefficient; c p {\displaystyle c_{p}} is the specific heat at constant pressure; G {\displaystyle
Reynolds_analogy
Physical phenomenon
approximately 0.09 for most fluids at moderate pressures. The heat transfer coefficient may be approximated using Bromley's equation, h = C [ k v 3 ρ
Leidenfrost_effect
convective heat transfer: h = N u c k d {\displaystyle h={\mathit {Nu}}_{c}{\frac {k}{d}}} Where h {\displaystyle h} is the heat transfer coefficient, N u c
Micro_heat_exchanger
Type of energy transfer
thermodynamics, heat is defined as energy in transfer between a body and its surroundings, other than through thermodynamic work or through transfer of matter
Heat
Physical property of matter
Heat equation – Partial differential equation describing the evolution of temperature in a region Heat transfer coefficient – Quantity relating heat flux
Heat_capacity
Thermodynamic property
energy portal Heat transfer coefficient Heat transfer Thermal conduction Thermal conductivity Heat flux Watt Flux "Heat and mass transfer" (PDF). Archived
Rate_of_heat_flow
Class of heat exchanger designs
increasing the heat-transfer coefficient. The fluids can be either liquids or gases on either the shell or the tube side. In order to transfer heat efficiently
Shell-and-tube_heat_exchanger
Machine transforming a liquid into a gas
evaporation rates at lower heat duties. The overall performance of evaporators depends on factors such as the heat transfer coefficient, tube/plate material
Evaporator
Delayed temperature response
{\displaystyle c} is specific heat capacity, with unit J⋅kg−1⋅K−1 Thermal effusivity has units of a heat transfer coefficient multiplied by square root of
Thermal_inertia
Process by which heat is transferred within an object
governed by the properties of the material and the heat transfer coefficient. The heat transfer coefficient, h, is measured in W m 2 K {\displaystyle \mathrm
Thermal_conduction
System that transfers heat from one space to another
A heat pump is a device that uses mechanical or thermal energy to transfer heat from one space to another. The mechanical heat pump uses electric power
Heat_pump
Thermal insulation using several thin layers
stack can be quantified in terms of its overall heat transfer coefficient U, which defines the radiative heat flow rate Q between two parallel surfaces with
Multi-layer_insulation
Topics referred to by the same term
(μ) is not available U or U-value, the symbol for the overall heat transfer coefficient or thermal transmittance Understeer gradient U Line, also known
U_(disambiguation)
Passive heat exchanger that transfers heat
A heat sink (also commonly spelled heatsink) is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device to a
Heat_sink
Welding using electromagnetic induction
q^{n}=h(T_{s}-T_{B})} Where: q n {\displaystyle q^{n}} is heat flux density h is the heat transfer coefficient T s {\displaystyle T_{s}} is the temperature of the
Induction_welding
\aleph u={\tfrac {hd_{n}}{\lambda }}} , h {\displaystyle h} is the heat transfer coefficient, d n {\displaystyle d_{n}} is the equivalent diameter, λ {\displaystyle
Nuclear_reactor_heat_removal
Rate of transfer of heat through matter, expressed as a U-value
units as heat transfer coefficient, thermal transmittance is different in that the heat transfer coefficient is used to solely describe heat transfer in fluids
Thermal_transmittance
Passing cold propellant through tubes around a rocket engine to cool it
{A_{t}}{A}}\right)^{0.9}\sigma } h g {\displaystyle h_{g}} is the heat transfer coefficient from the hot combustion gas to the chamber/nozzle interior wall
Regenerative cooling (rocketry)
Regenerative_cooling_(rocketry)
Minimization of heat transfer
Thermal insulation is the reduction of heat transfer (i.e., the transfer of thermal energy between objects of differing temperature) between objects in
Thermal_insulation
Analogy for heat, momentum, and mass transfer
Prandtl–Taylor analogy) developed to directly relate heat transfer coefficients, mass transfer coefficients and friction factors, Chilton and Colburn J-factor
Chilton and Colburn J-factor analogy
Chilton_and_Colburn_J-factor_analogy
System storing hot fluid heat to heat the cold fluid
make it ideal for gas-gas heat exchange applications requiring effectiveness exceeding 85%. The heat transfer coefficient is much lower for gases than
Regenerative_heat_exchanger
Direct conversion of temperature differences to electric voltage and vice versa
temperature on each side. Conversely, when a voltage is applied to it, heat is transferred from one side to the other, creating a temperature difference. This
Thermoelectric_effect
Applies an electric current to heat or cool materials
Peltier cooler, heater, or thermoelectric heat pump is a solid-state active heat pump which transfers heat from one side of the device to the other, with
Thermoelectric_heat_pump
Simplification of a physical system into a network of discrete components
in joules h is the heat transfer coefficient between the surface and the fluid A is the surface area of the heat being transferred T is the temperature
Lumped-element_model
fluids the Dittus-Boelter Equation can be used to determine the heat transfer coefficient for both the inner and outer streams; given their diameters and
Concentric tube heat exchanger
Concentric_tube_heat_exchanger
Load caused by rapid temperature change
{\displaystyle h} is the heat transfer coefficient, and k {\displaystyle k} is the thermal conductivity. If perfect heat transfer ( B i = ∞ {\displaystyle
Thermal_shock
Temperature at the boundary layer of a fluid undergoing convection
Nusselt number, Reynolds number or Grashof number to calculate a heat transfer coefficient, because it is a reasonable first approximation to the temperature
Film_temperature
Regulation of the temperature of electronic circuitry to prevent inefficiency or failure
heat transfer coefficient. Generally, forced convection heat sink thermal performance is improved by increasing the thermal conductivity of the heat sink
Thermal management (electronics)
Thermal_management_(electronics)
Ratio of the thermal resistances of a body's interior to its surface
conductivity of the body [W/(m·K)] h {\displaystyle {h}} is a convective heat transfer coefficient [W/(m2·K)] L {\displaystyle {L}} is a characteristic length [m]
Biot_number
Capacity of a material to conduct heat
occurring in series. There is also a measure known as the heat transfer coefficient: the quantity of heat that passes per unit time through a unit area of a
Thermal conductivity and resistivity
Thermal_conductivity_and_resistivity
International shipping standard
externally; heat transfer coefficient K=0.7W/M2.K H5 (HM) Insulated - Heat transfer coefficient K=0.4W/M2.K H6 (HV) Insulated - Heat transfer coefficient K=0
ISO_6346
Fluid flow that occurs due to heterogeneous fluid properties and body forces
Convection is the transfer of heat through the physical movement of fluids (liquids or gases), where warmer, less-dense material rises and cooler, denser
Convection
condensation is one of the most effective mechanism of heat transfer and extremely large heat transfer coefficients can be achieved with this mechanism. In dropwise
Dropwise_condensation
System to transfer heat to/from the ground
A ground source heat pump (also geothermal heat pump) is a heating/cooling system for buildings that use a heat pump to transfer heat to or from the ground
Ground_source_heat_pump
Apparatus for measuring reaction energy
power (W) U {\displaystyle U} → overall heat transfer coefficient (W/(m2K)) A {\displaystyle A} → heat transfer area (m2) T r {\displaystyle T_{r}} → process
Reaction_calorimeter
Temperature of a thermometer covered by moist cloth
}} convective heat transfer coefficient (W/m2·K) Note that: ( H − H 0 ) {\displaystyle (H-H_{0})} is the driving force for mass transfer (constantly equal
Wet-bulb_temperature
Study of gas-vapor mixtures
psychrometric ratio is the ratio of the heat transfer coefficient to the product of mass transfer coefficient and humid heat at a wetted surface. It may be evaluated
Psychrometrics
a luminophore that is sensitive to temperature to measure the heat transfer coefficient. This provides additional accuracy in the pressure readings. The
Pressure-sensitive_paint
Method to calculate rate of heat transfer in heat exchangers
overall heat transfer coefficient, A {\displaystyle A} is the total heat transfer area, and C m i n {\displaystyle C_{min}} is the minimum heat capacity
NTU_method
Measure of how well an object, per unit of area, resists conductive flow of heat
transfer coefficient and can be found by taking the inverse of the R-value. It is a property that describes how well building elements conduct heat per
R-value_(insulation)
Metal housing which protects a temperature sensor immersed in a fluid
the result of the thermal mass of the thermowell tip, and the heat transfer coefficient between the thermowell and the fluid. A representative thermowell
Thermowell
Machine used in circuit board production
vapour phase soldering are: High energy efficiency due to the high heat transfer coefficient of vapour phase media Soldering is oxygen-free. There is no need
Reflow_oven
Physical constant for the strength of gravity induced by a mass
is more recent, as "Newton's constant" was also used for the heat transfer coefficient in Newton's law of cooling, but has by now become quite common
Gravitational_constant
heat transfer coefficient. The optimum height ratio of feed water is found to be Rh = 0.3. Any height ratio less than 0.3 will cause the local heat transfer
Climbing and falling film plate evaporator
Climbing_and_falling_film_plate_evaporator
SC= shading coefficient Q = U*A*CLTD Q = U*A*(T2-T1) Where Q = Overall heat transfer in Btu per hour U = Overall heat transfer coefficient in Btu/(ft2-hr-deg
Cooling load temperature difference calculation method
Cooling_load_temperature_difference_calculation_method
Physical process
seeds for vapor growth. Confined boiling typically has higher heat transfer coefficient but a lower CHF than pool boiling. CHF occurs when the vapor momentum
Boiling
interest. Heat Heat capacity Heat capacity ratio Heat equation Heat transfer coefficient Latent heat Specific heat capacity Specific melting heat Temperature
Heat_capacity_rate
Heat flux at which boiling is no longer an effective method of heat transfer
the study of heat transfer, critical heat flux (CHF) is the heat flux at which boiling ceases to be an effective form of transferring heat from a solid
Critical_heat_flux
Characteristic time in a system
{\displaystyle F=hA_{s}\left(T(t)-T_{a}\right),} where h is the heat transfer coefficient, and As is the surface area, T is the temperature function, i
Time_constant
Topics referred to by the same term
Solar system H (as in ΔH), magnitude of enthalpy h, convective heat transfer coefficient H, magnetic field intensity H, symbol for the Henry (unit), the
H_(disambiguation)
overhangs). Window design methods have moved away from Shading Coefficient to Solar Heat Gain Coefficient (SHGC), which is defined as the fraction of incident solar
Shading_coefficient
Fluid used to maximize thermal contact
as thermal insulation) from the interface area in order to maximize heat transfer and dissipation. Thermal paste is an example of a thermal interface
Thermal_paste
Tendency of matter to change volume in response to a change in temperature
material lead to characteristic discontinuities of the coefficient of thermal expansion and specific heat. These discontinuities allow detection of the glass
Thermal_expansion
Topics referred to by the same term
Hampshire, England Halley-type comet, a group of short-period comets Heat transfer coefficient, in thermodynamics High-temperature superconductor, a material
HTC_(disambiguation)
Partial differential equation describing the evolution of temperature in a region
positive coefficient called the thermal diffusivity of the medium. In addition to other physical phenomena, this equation describes the flow of heat in a
Heat_equation
Fluid containing nanometer-sized particles, called nanoparticles
considered the effect of an external magnetic field on the convective heat transfer coefficient of water-based magnetite nanofluid experimentally under laminar
Nanofluid
Dimensionless parameter in fluid mechanics
uc_{p}}}} where h = convection heat transfer coefficient G = mass flux of the fluid ρ = density of the fluid cp = specific heat of the fluid u = velocity of
Stanton_number
German company
location, so that an adequate heat insulation is achieved. The glass walls have 51 mm triple glazing with a heat transfer coefficient (U-value) of 0.6 W/m2K
Huf_Haus
Topics referred to by the same term
as one-millionth of an ampere UA, the product of a heat exchanger's overall heat transfer coefficient U and its active exchange area A in thermodynamics
UA
Power plant that generates electricity from heat energy
with hydrogen gas, selected because it has the highest known heat transfer coefficient of any gas and for its low viscosity, which reduces windage losses
Thermal_power_station
Optimization process
p_{i}} = i -th estimated parameter (e.g. heat transfer coefficient) w y {\displaystyle w_{y}} = weighting coefficient reflecting the relative importance of
Moving_horizon_estimation
Biocomposite material used for construction and insulation
transfer coefficient was measured using ISOMET 2114, a portable system for measuring the heat transfer of properties. Hempcrete has a coefficient of heat transfer
Hempcrete
Welding technique
normal to the surface impinged on by the laser, h=convective heat transfer coefficient for air, σ is the Stefan–Boltzmann constant for radiation, and
Laser_beam_welding
Topics referred to by the same term
(ISO 639 code ral) RaL, the Rayleigh number w.r.t. length; see heat transfer coefficient respectful adoption language, part of the language of adoption
RAL
Energy stored by oceans
exceeded the ocean surface due to the lower inertia (smaller heat-transfer coefficient) of solid land and ice, temperatures would rise more rapidly and
Ocean_heat_content
Light or sound absorption in a substance
The linear attenuation coefficient, attenuation coefficient, or narrow-beam attenuation coefficient characterizes how easily a volume of material can be
Attenuation_coefficient
Mathematical models of heat pumps and refrigeration
at a high coefficient of performance in very varied conditions, as is the case with heat pumps where external temperatures and internal heat demand vary
Heat pump and refrigeration cycle
Heat_pump_and_refrigeration_cycle
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