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The cooling load temperature difference (CLTD) calculation method, also called the cooling load factor (CLF) or solar cooling load factor (SCL) method, is
Cooling load temperature difference calculation method
Cooling_load_temperature_difference_calculation_method
Applies an electric current to heat or cool materials
across the junction of the semiconductors, causing a temperature difference. The side with the cooling plate absorbs heat which is then transported by the
Thermoelectric_heat_pump
Rate of air temperature movement
radiant time series, cooling load temperature difference, transfer function, and sol-air temperature. Methods calculate the cooling load in either steady
Cooling_load
Satisfaction with the thermal environment
body can continue to operate. The heat transfer is proportional to temperature difference. In cold environments, more heat is released than the body generates
Thermal_comfort
Category of HVAC technologies
hydronic cooling systems in Europe, embedding cool water pipes in structures to absorb and dissipate heat, meeting cooling loads. Radiant cooling became
Radiant_heating_and_cooling
efficiency. Loads served by the heating/cooling system that are not included in peak heating/ cooling block load calculations. These loads include duct
Glossary of geothermal heating and cooling
Glossary_of_geothermal_heating_and_cooling
Waste-heat-removal system
engine cooling uses either air or liquid to remove the waste heat from an internal combustion engine. For small or special purpose engines, cooling using
Internal combustion engine cooling
Internal_combustion_engine_cooling
Control loop feedback mechanism
available. Overshoot of rising temperature can only be corrected slowly; active cooling is not available to force temperature downward as a function of the
PID_controller
Technique for ventilation of a building
Fred; Webster, Tom (February–March 2011). "Simplified calculation method for design cooling loads in underfloor air distribution (UFAD) systems". Energy
Underfloor_air_distribution
Amount of heat a computer's cooling system must dissipate
exceeding the maximum junction temperature for the laptop's CPU. A cooling system can do this using an active cooling method (e.g. conduction coupled with
Thermal_design_power
Reversible transition in amorphous materials
supercooled liquid at this same temperature. Tg is located at the intersection between the cooling curve (volume versus temperature) for the glassy state and
Glass_transition
Method in chemical engineering
streams, as a function of heat load (product of specific enthalpy and mass flow rate; SI unit W) against temperature (SI unit K). These data are combined
Pinch_analysis
American building thermal comfort standard
References Normative Appendix A: Methods for determining operative temperature Normative Appendix B: Computer program for calculation of PMV/PPD Normative Appendix
ASHRAE_55
Cooling of air in an enclosed space
a mechanical air conditioner or through other methods, such as passive cooling and ventilative cooling. Air conditioning is a member of a family of systems
Air_conditioning
Form of central heating and cooling
Underfloor heating and cooling is a form of central heating and cooling that achieves indoor climate control for thermal comfort using hydronic or electrical
Underfloor_heating
Equipment used to transfer heat between fluids
but cooling coils must be adequately designed and selected to handle their particular latent (moisture) as well as the sensible (cooling) loads. The
Heat_exchanger
Lowest theoretical temperature
nears this limit, further reductions in temperature become increasingly difficult, regardless of the cooling method used. In 2018, scientists at the University
Absolute_zero
Passive heat exchanger that transfers heat
of their temperature. Effective cooling is therefore essential. A case study of a LED based downlighter shows an example of the calculations done in order
Heat_sink
Materials' resistance to heat transfer
heat sinks and cooling systems in electronic devices. Automotive design: Automotive engineers use thermal resistance to optimize the cooling system and prevent
Thermal conductance and resistance
Thermal_conductance_and_resistance
Type of Soviet nuclear power reactor
independent cooling circuits, each having four main circulating pumps (three operating, one standby) that service one half of the reactor. The cooling water
RBMK
Ratio to describe data-center efficiency
Miami. A colder climate results in a lesser need for a massive cooling system. Cooling systems account for roughly 30 percent of consumed energy in a
Power_usage_effectiveness
Concentration of water vapour in the air
the given temperature. There is a very small difference described under "Enhancement factor" below, which can be neglected in many calculations unless great
Humidity
Energy storage technique
around a temperature lower than this critical temperature. The heat loads that must be removed by the cooling system include conduction through the support
Superconducting magnetic energy storage
Superconducting_magnetic_energy_storage
System to cool the air in a vehicle
(5): 954–969. doi:10.1016/j.eng.2019.02.009. ISSN 2095-8099. "Design Load Calculation Tools | Northeast Energy Efficiency Partnerships". neep.org. Retrieved
Automotive_air_conditioning
Effects of thermal limits on nuclear operations
refinement for fuel reload design optimization. Improvements in calculation methods allow engineers to reduce unnecessary safety margins without increasing
Thermal_limits_(nuclear)
Most common type of heat pump
(10 December 2022). "Electrification of residential heating, cooling and hot water: Load smoothing using onsite photovoltaics, heat pump and thermal batteries"
Air_source_heat_pump
Machine to increase pressure of gas by reducing its volume
further compresses the gas and increases its pressure and also temperature (if inter cooling between stages is not used). Compressors are similar to pumps:
Compressor
Separation of a mixture into its component parts
Packing columns are normally used for smaller towers and loads that are corrosive or temperature-sensitive or for vacuum service where pressure drop is
Fractional_distillation
Measure of how well an object, per unit of area, resists conductive flow of heat
additive for multiple layers of materials. R-value is defined as the temperature difference needed to sustain one unit of heat flux between the warmer surface
R-value_(insulation)
Component of central heating and cooling systems
Automatic balancing valves are utilised in central heating and cooling systems that rely on flow of water through the system. They use the latest flow
Automatic_balancing_valve
Climatic cooling after the Medieval Warm Period (16th–19th centuries)
global mean temperature changes in past centuries. ... [Viewed] hemispherically, the "Little Ice Age" can only be considered as a modest cooling of the Northern
Little_Ice_Age
Flat, horizontal concrete element of modern buildings
heavy load and seasonal temperature shifts. Constantine published his findings in the Journal of Structural Materials in 1931, and his method was quickly
Concrete_slab
Resistance of a fluid to shear deformation
of Water – a table of water viscosity as a function of temperature Calculation of temperature-dependent dynamic viscosities for some common components
Viscosity
Hypothetical climatic effect of nuclear war
surface temperature. The severity of this cooling in Alan Robock's model suggests that the cumulative products of 100 of these firestorms could cool the global
Nuclear_winter
Electricity generation by nuclear fusion
for plasma containment must consider: A heating and cooling cycle, up to a 10 MW/m2 thermal load. Neutron radiation, which over time leads to neutron
Fusion_power
Materials whose temperature variance leads to voltage change
voltage from temperature difference), Peltier effect (driving heat flow with an electric current), and Thomson effect (reversible heating or cooling within
Thermoelectric_materials
delta T) a reference to a temperature difference. It is used to describe the difference in temperature of a heating or cooling medium as it enters and as
Glossary_of_HVAC_terms
Combustion engine using an eccentric rotary design
reciprocating engine. With circumferential or axial flow cooling, the temperature difference remains tolerable. Problems arose during research in the
Wankel_engine
Measurement of electromagnetic radiation
plants, the heating and cooling loads of buildings, climate modeling and weather forecasting, passive daytime radiative cooling applications, and space
Solar_irradiance
Manufacturing styles of an electronic device
rated voltage. Examples for calculations of individual pulse loads are given by many manufactures, e.g. WIMA and Kemet. An AC load only can be applied to a
Capacitor_types
State of matter
approximated by the Equipartition theorem, which greatly-simplifies calculation. However, this method assumes all molecular degrees of freedom are equally populated
Gas
Type of nuclear fission reactor
dissipated. Some SMR designs proposes cooling systems only based on thermoconvection – natural circulation – to eliminate cooling pumps that could break down.
Small_modular_reactor
Solar energy effect
its potential for overheating a space. To minimize this and reduce cooling loads, several technologies exist for solar gain reduction. SHGC is influenced
Solar_gain
Simultaneous generation of electricity and useful heat
at moderate temperatures (100–180 °C (212–356 °F) can also be used in absorption refrigerators for cooling. The supply of high-temperature heat first drives
Cogeneration
Distance traveled by a vehicle compared to volume of fuel consumed
steering assistance or an electrically powered hydraulic pump. Cooling. The older cooling systems used a constantly engaged mechanical fan to draw air through
Fuel_economy_in_automobiles
Speed that exceeds five times the speed of sound (Mach 5 and above)
is extremely difficult, since, due to the calculation of the radiation at each point, the computation load theoretically expands exponentially as the
Hypersonic_speed
Device for measuring a physical quantity
meter. Also called component bridge due to the bridge circuit method of measurement. Temperature-related considerations dominate thermodynamics. There are
List_of_measuring_instruments
Hypothetical travel between stars or planetary systems
for a trip to Barnard's Star using a more precise concept of the wait calculation where for a given destination and growth rate in propulsion capacity
Interstellar_travel
Force resisting sliding motion
interactions involved makes the calculation of friction from first principles difficult, and it is often easier to use empirical methods for analysis and the development
Friction
Precipitation in the form of ice crystal flakes
ambient temperature, wind, and precipitation. Initial snowmelt models used a degree-day approach that emphasized the temperature difference between the
Snow
Concept nuclear reactor whose water operates at supercritical pressure
to cool the entire vessel wall with feedwater, but results in a complex and materially demanding (high temperature, high temperature differences, high
Supercritical_water_reactor
Electrical device that uses batteries to prevent any interruption of power flow
systems. Larger systems (such as for data centers) require detailed calculation of the load, inverter efficiency, and battery characteristics to ensure the
Uninterruptible_power_supply
Form of fusion power
spreading thermal load from across multiple beams while coherently combining their energy. Efficient gas-cooled or cryogenic cooling systems are essential
Aneutronic_fusion
regulation from engine load (from MAP sensor) Correction of advance angle depending on temperature (various types of coolant temperature sensors) Correction
SECU-3
Extracting energy from the ocean
conversion (OTEC) is a renewable energy technology that harnesses the temperature difference between the warm surface waters of the ocean and the cold depths
Ocean thermal energy conversion
Ocean_thermal_energy_conversion
Test method using liquid-cooled closed booth [Withdrawn without replacement] ISO 3150:1975 Radiators, convectors and similar appliances — Calculation of
List of ISO standards 3000–4999
List_of_ISO_standards_3000–4999
Engineering discipline
uses numerical methods and algorithms to solve and analyze problems that involve fluid flows. Computers are used to perform the calculations required to
Mechanical_engineering
Technique used to attain a high quality factor in resonant cavities
– a good electrical conductor – and operated near room temperature with exterior water cooling to remove the heat generated by the electrical loss in
Superconducting radio frequency
Superconducting_radio_frequency
Chart showing compressor performance
as engine temperature ratio. Grandcoing shows the constant temperature lines crossed as a helicopter compressor goes from no-load to full-load with increasing
Compressor_map
Non-airbreathing engine used to propel a missile or vehicle
copper alloys must employ cooling systems to limit the temperatures that engine structures experience. Regenerative cooling, where the propellant is passed
Rocket_engine
Separation technique to characterize the size of colloidal particles
coefficient or the hydrodynamic size. For a thermal field (heating one wall and cooling the other), it is the ratio of the thermal and the translational diffusion
Field_flow_fractionation
Replication of aspects of building performance
had been developed focusing on energy assessments and heating/cooling load calculations. This effort resulted in more powerful simulation engines released
Building performance simulation
Building_performance_simulation
Comparison of costs of different electricity generation sources
Assessment Report contains LCOE calculations for broad range of energy sources in the following four scenarios: 10% WACC, high full load hours (FLH), no carbon
Cost_of_electricity_by_source
temperature T {\displaystyle T} . If the temperature is allowed to vary, the equation must be integrated over the temperature path. This calculation of
Introduction_to_entropy
Division of the U.S. Naval Surface Warfare Center
Microwave Tubes. Analyses include calculation of Electric Potential and Electric Field using Finite Element Method (FEM). Particular FEM analysis tools
Naval Surface Warfare Center Crane Division
Naval_Surface_Warfare_Center_Crane_Division
Lighter-than-air aircraft
balloon depends primarily upon the difference between the temperature of the air inside the envelope and the temperature of the air outside the envelope
Hot_air_balloon
Use of sunlight for water heating with a solar thermal collector
environmental load of an average European inhabitant) in Greece, a purely gas-driven system may have fewer emissions than a solar system. This calculation assumes
Solar_water_heating
Solid conductive electrolyte
polymerization rate can be controlled by cryogenic cooling or by electrochemical polymerization. The cooling method requires a very great technical effort and
Polymer_capacitor
it and cooled by the gas surrounding it. If the gas pressure is reduced, the cooling effect will decrease, hence the equilibrium temperature of the wire
Pressure_measurement
Sub-discipline of systems engineering that emphasizes dependability
Reliability Centered Maintenance, (probabilistic) load and material stress and wear calculations, (probabilistic) fatigue and creep analysis, human error
Reliability_engineering
Fluid dynamics in buildings
internal environment of buildings: wind loading, ventilation analysis and heating/cooling load calculations. Previously, most building-related issues
CFD_in_buildings
Lubricant used for internal combustion engines
under high load. This typically takes longer than heating the main cooling agent – water or mixtures thereof – up to its operating temperature. In order
Motor_oil
Genus of insect
achieve flight with the degree of wing loading necessary. 'Supposedly someone did a back of the envelope calculation, taking the weight of a bumblebee and
Bumblebee
Magnetic confinement device used to produce thermonuclear fusion power
through the chamber's inner wall to a water-cooling system, where the heated water proceeds to an external cooling system through convection. Turbomolecular
Tokamak
Chemical compound
only of low temperatures, but also of a low level of inner-cloud turbulence. Line ratio calculations provide a measurement of cloud temperature that is independent
Ammonia
effects of the liquid cooling setup accurately. The model equations are described in reference. Designers can use this method to validate their simulation
Run-time estimation of system and sub-system level power consumption
Run-time_estimation_of_system_and_sub-system_level_power_consumption
Producing special gas mixtures to specification
the process, but requires accurate measurement of mass or weight, and calculation of constituent masses from the specified molar ratio. Both partial pressure
Gas_blending
assays. Active cooling – an active cooling system is one that involves the use of energy to cool something, as opposed to passive cooling that uses no energy
Glossary of mechanical engineering
Glossary_of_mechanical_engineering
Technology for constructing integrated circuits
II processors with a combination of liquid nitrogen and liquid helium cooling. Silicon carbide CMOS devices have been tested for a year at 500 °C. Ultra
CMOS
Class of chemical substance
to increase energy efficiency in room temperature space cooling applications. When cooling outdoor air, a cooling unit must deal with the air's sensible
Metal–organic_framework
Using sunlight for internal lighting
well as to balance the use of glazing to ensure more light and less cooling load. Architectural glass Circadian rhythm Daylight Daylight harvesting Daylight
Daylighting_(architecture)
Powered mechanical device
Examples of these devices range from a thermostat that as temperature rises opens a valve to cooling water to speed controllers such as the cruise control
Machine
Standard for green building design
load assumptions made by 92 energy modeling practitioners against ASHRAE and Title 24 requirements, and the evaluation of the plug load calculation methodology
LEED
Multi-wavelength imaging method
the Multivariate Optical Element spectral calculation engine or the Spatial Light Modulator spectral calculation engine. In these platforms, chemical information
Hyperspectral_imaging
Incoherent light source
power-loading capacity of the glass. Power loading is determined by the type and thickness of the glass, and the cooling method that is used. Power loading
Flashtube
Type of capacitor
time (useful life, load life, service life) T0 = upper category temperature (°C) TA = temperature (°C) of the case or ambient temperature near the capacitor
Aluminum electrolytic capacitor
Aluminum_electrolytic_capacitor
Compound of carbon, oxygen, and hydrogen
of 2-3 water monolayers. Cooling the graphite oxide/H2O samples results in "pseudo-negative thermal expansion" and cooling below the freezing point of
Graphite_oxide
Method to produce electricity from solar radiation
temperature. This means that a 100 degree increase in surface temperature could decrease the efficiency of a solar cell by about half. Self-cooling solar
Photovoltaics
Machine that converts electrical energy into mechanical energy
designed armature winding sets. Continuous torque density relates to method of cooling and permissible operation period before destruction by overheating
Electric_motor
Low-pressure voids formed in liquids
major difference between the two is the thermodynamic paths that precede the formation of the vapor. Boiling occurs when the local temperature of the
Cavitation
Jet engine where combustion takes place in supersonic airflow
high-energy fuels and active cooling schemes to maintain sustained operation, often using hydrogen and regenerative cooling techniques. All scramjet engines
Scramjet
threaded between them, usually used to lift or pull heavy loads. Bohr model boiling point The temperature at which a liquid undergoes a phase change into a gas;
Glossary_of_physics
Long-ranged guns for land warfare
(September 2013). "Effectiveness Calculation of Multiple Rounds Simultaneous Impact Shooting Method Based on Monte Carlo Method". Applied Mechanics and Materials
Artillery
Motorcycle technology and verification
heavier one. The difference between GVWR and wet weight is how much the motorcycle can safely carry, including the rider, fuel, and other load. As its weight
Motorcycle testing and measurement
Motorcycle_testing_and_measurement
Electronic component
body. In order for there to be an efficient energy conversion, the temperature difference between the two bodies must be significant. R. L. Bailey claims
Optical_rectenna
Flow of electric charge
magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. It was discovered by Heike Kamerlingh Onnes on April 8
Electric_current
Technology for splitting specific gases out of mixtures
method is a relatively low environmental impact and sustainable process providing continuous production, simple operation, lower pressure/temperature
Membrane_gas_separation
Central computer component that executes instructions
the CPU to require more heat dissipation in the form of CPU cooling solutions. One method of dealing with the switching of unneeded components is called
Central_processing_unit
typically expand in response to heating and contract on cooling; this dimensional response to temperature change is expressed by its coefficient of thermal
Glossary_of_fuel_cell_terms
Material with Vickers hardness exceeding 40 gigapascals
high thermal stability. Depending on the heating method, it will maintain its mass up to temperatures of 600–800 °C, with any drop being due to loss of
Superhard_material
COOLING LOAD-TEMPERATURE-DIFFERENCE-CALCULATION-METHOD
COOLING LOAD-TEMPERATURE-DIFFERENCE-CALCULATION-METHOD
COOLING LOAD-TEMPERATURE-DIFFERENCE-CALCULATION-METHOD
COOLING LOAD-TEMPERATURE-DIFFERENCE-CALCULATION-METHOD
COOLING LOAD-TEMPERATURE-DIFFERENCE-CALCULATION-METHOD
COOLING LOAD-TEMPERATURE-DIFFERENCE-CALCULATION-METHOD
COOLING LOAD-TEMPERATURE-DIFFERENCE-CALCULATION-METHOD
COOLING LOAD-TEMPERATURE-DIFFERENCE-CALCULATION-METHOD
COOLING LOAD-TEMPERATURE-DIFFERENCE-CALCULATION-METHOD