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Measurement scale for the effectiveness of air filters
Minimum Efficiency Reporting Value, commonly known as MERV, is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and
Minimum efficiency reporting value
Minimum_efficiency_reporting_value
Efficiency standard of air filters
Hypoallergenic vacuum cleaner – vacuum cleaner with high efficiency air filter Minimum efficiency reporting value – Measurement scale for the effectiveness of air
HEPA
Device which removes solid particulates from the air
However, some cabin air filter manufacturers do print a minimum efficiency reporting value (MERV) filter rating or cite N95 (however disclaim any NIOSH
Air_filter
passes through the filter. MPR is different from MERV, the Minimum Efficiency Reporting Value. The MERV system measures a filter's ability to capture large
Microparticle performance rating
Microparticle_performance_rating
Type of air filter
different classes for air filters for comparison Minimum efficiency reporting value (MERV) High-efficiency particulate air (HEPA) Microparticle performance
Ultra-low_particulate_air
Air-Conditioning Engineers (ASHRAE) using a standard known as Minimum Efficiency Reporting Value (MERV). MERV is determined based on the size of particles
Air filtration in operating rooms
Air_filtration_in_operating_rooms
Underground heat exchanger loop that can capture or dissipate heat to or from the ground
system: Outside air is drawn from a filtered air intake (Minimum Efficiency Reporting Value MERV 8+ air filter is recommended) to cool or preheat the
Ground-coupled_heat_exchanger
Symptoms of illness attributed to a building
and insufficient fresh-air intake or air filtration (see "Minimum efficiency reporting value"). Sick building syndrome has also been attributed to heating
Sick_building_syndrome
System that transfers heat from one space to another
Larger values of either metric indicate better performance. When comparing the performance of heat pumps, the term performance is preferred to efficiency, with
Heat_pump
Heating of air in buildings or vehicles
warehouses, offices and education buildings. This is because of their energy efficiency, heating distribution and noise when in operation. Distributed heating
Heating_system
Range of indoor air temperatures preferred by most people
factors. For infants, elderly, and those with significant health problems, a minimum of 20 °C (68 °F) was recommended. Temperatures lower than 16 °C (61 °F)
Room_temperature
Heating or air-conditioning system
drops to the cooling temperature setpoint, the airflow reaches a lower minimum value than that used in the "single maximum" sequence (10% - 20% vs. 30% -
Variable_air_volume
Minimization of heat transfer
and cheaper to keep warm in the winter, or cool in the summer. Energy efficiency will lead to a reduced carbon footprint. more comfortable because there
Thermal_insulation
Engineering discipline
integrated MEng degree, a minimum of 4 years post graduate on the job competency development and a peer-reviewed project report to become a Chartered Mechanical
Mechanical_engineering
Cooling of air in an enclosed space
electricity in 2022, and emitted 3% of greenhouse gas. A 2018 report on air conditioning efficiency by the International Energy Agency predicted an increase
Air_conditioning
Closed vessel in which fluid is heated
fuel use in kg/h GCV, gross calorific value in kcal/kg (e.g., pet coke 8200 kcal/kg) To measure boiler efficiency by indirect method, these parameters
Boiler
Type of water heater
circumstances, a heating system can achieve high efficiency (greater than 90% on the higher heating value) by condensing water vapour found in the exhaust
Condensing_boiler
Technology of indoor and vehicular environmental comfort
The current industry minimum SEER rating is 14 SEER.[citation needed] Engineers have pointed out some areas where efficiency of the existing hardware
Heating, ventilation, and air conditioning
Heating,_ventilation,_and_air_conditioning
Absorption refrigerator invented in 1930
the design was still "nowhere near commercialised", but might allow the efficiency of the original Einstein–Szilárd design to be quadrupled. Rudolf Goldschmidt
Einstein_refrigerator
Ventilation using solar energy
system Infrared thermometer Intelligent buildings LonWorks Minimum efficiency reporting value (MERV) Normal temperature and pressure (NTP) OpenTherm Programmable
Solar_chimney
Component of air conditioning and refrigeration systems
value. Although often described as a "thermostatic" valve, an expansion valve is not able to regulate the evaporator's temperature to a precise value
Thermal_expansion_valve
Process for digital management of built assets
industry efficiency in general and to BIM adoption in particular. In August 2004 a US National Institute of Standards and Technology (NIST) report conservatively
Building_information_modeling
Type of air filtering equipment
well as a HEPA (high-efficiency particulate air), ULPA (ultra-low particulate air) or other MERV (minimum efficiency reporting value) filter. A motorized
Fan_filter_unit
Pressure exerted by molecules of water vapor in gaseous form
calculated at six temperatures with their percentage error from the table values of Lide (2005): A more detailed discussion of accuracy and considerations
Vapour_pressure_of_water
Type of convection heater
Several efficiency metrics can be measured about heaters, such as the efficiency of heating a room with a given amount of power, the efficiency of the
Oil_heater
Equipment used to transfer heat between fluids
exchanger, 2-pass shell side, 2-pass tube side (2-2 countercurrent) For efficiency, heat exchangers are designed to maximize the surface area of the wall
Heat_exchanger
Air compressor
overcome the machining hurdles of radial compliance inherent to achieving efficiency in scroll operation that would not be adequately addressed until the works
Scroll_compressor
Physics of heat, work, and temperature
zero, all processes cease and the entropy of the system approaches a minimum value. This law of thermodynamics is a statistical law of nature regarding
Thermodynamics
Heat transfer due to the movement of fluid
dependent upon the physical properties of the fluid and the physical situation. Values of h have been measured and tabulated for commonly encountered fluids and
Convection_(heat_transfer)
Concept in physics
infiltration or fire hazard. Since buildings are not totally sealed (at the very minimum, there is always a ground level entrance), the stack effect will cause
Stack_effect
Type of home appliance that clears smoke from a stove
cubic meters per second (m3/s), or cubic feet per minute (cfm). Energy efficiency is evaluated based on the power consumption relative to airflow output
Kitchen_hood
Concentration of water vapour in the air
regulate internal body temperature, high humidity impairs heat exchange efficiency by reducing the rate of moisture evaporation from skin surfaces. This
Humidity
Conduit used in heating, ventilation, and air conditioning
This reduces resistance and improves airflow, as well as ventilation efficiency. Minimize bends and kinks as much as possible, since they can affect how
Duct_(flow)
Subfields of building design and construction
for people designing HVAC systems is the efficiency, i.e., the consumption of electricity and water. Efficiency is optimised by changing the design of the
Mechanical, electrical, and plumbing
Mechanical,_electrical,_and_plumbing
Temperature control system
to be found in many gas water heaters and gas fireplaces. Their poor efficiency is acceptable in water heaters, since most of the energy "wasted" on the
Thermostat
Filtration efficacy measurement
amount of airflow and particle removal efficiency, consumers are less likely to be misled by a high efficiency filter that is filtering a small amount
Clean_air_delivery_rate
Measure of energy in a thermodynamic system
and final pressure and temperature correspond to the standard state. The value does not depend on the path from initial to final state because enthalpy
Enthalpy
Device that removes contaminants from the air in a room
problem is worse for the higher-efficiency MERV filters because of the increase in air resistance. Higher-efficiency MERV filters are usually denser and
Air_purifier
Interior fungal growth
or scrubbing with water and a detergent and drying quickly. HEPA (high-efficiency particulate air) vacuum cleaner: Used in remediation areas after materials
Indoor_mold
Exhaust for a fireplace, furnace etc
second time, reducing soot, noxious emissions and increasing overall efficiency. The term flue is also used to define certain pipe organ pipes, or rather
Flue
Device used to regulate and circulate air as part of an HVAC system
curve fans without scroll or "plug fans". These are driven using high efficiency EC (electronically commutated) motors with built in speed control. The
Air_handler
American HVAC professional association
technical standards to improve building services engineering, energy efficiency, indoor air quality, and sustainable development. ASHRAE was founded in
ASHRAE
Device for firing solid fuels in buildings
relatively low efficiency rating. Standard, modern, wood-burning masonry fireplaces though have an efficiency rating of at least 80% (legal minimum requirement
Fireplace
Home automation software
system Infrared thermometer Intelligent buildings LonWorks Minimum efficiency reporting value (MERV) Normal temperature and pressure (NTP) OpenTherm Programmable
Home_Assistant
Standards organization
industry, government, and investors; Market intelligence reports including the Wohlers Report and specialized sector analyses; Technical expertise contributing
ASTM_International
Communication protocol used for building automation
Channel CharacterString Value Command Credential Data Input Date Value DatePattern Value DateTime Value DateTimepattern Value Device Elevator Group Escalator
BACnet
Organic chemicals having a high vapor pressure at room temperature
which such activities are applied to comply either with the emission limit values set out in the Directive or with the requirements of the so-called reduction
Volatile_organic_compound
Machine to increase pressure of gas by reducing its volume
Due to minimum clearance volume between the fixed scroll and the orbiting scroll, these compressors have a very high volumetric efficiency. These compressors
Compressor
Device used for heating buildings
side or roof of the structure. Fuel efficiency in a gas furnace is measured in AFUE (Annual Fuel Utilization Efficiency). The name derives from Latin word
Furnace_(central_heating)
Type of heating system
of thermal power station and electric resistance heating, the overall efficiency will be less than for direct use of fossil fuel for space heating. Some
Central_heating
Process of moving heat from one location to another in controlled conditions
better insulated ships helped reduce ice wastage from 66% to 8%. This efficiency gain influenced Tudor to expand his ice market to other towns with icehouses
Refrigeration
Device that changes direct current (DC) to alternating current (AC)
operation. This also affects the efficiency of the system as a whole, since the manufacturer's nominal conversion efficiency does not account for harmonics
Power_inverter
Electrical device to ionise air molecules
this report, The Sharper Image, a manufacturer of air ionisers (among other products), sued Consumer's Union (the publishers of Consumer Reports) for
Air_ioniser
Thermometer which infers temperature by measuring infrared energy emission
equipment or enclosed space hot or cold spot monitoring for safety and efficiency maintenance purposes. A photographic camera using infrared film and suitable
Infrared_thermometer
Release of a gas that was inside of some material
system Infrared thermometer Intelligent buildings LonWorks Minimum efficiency reporting value (MERV) Normal temperature and pressure (NTP) OpenTherm Programmable
Outgassing
Household appliance that heats a single room or other small area
pace. Sometimes called fan heaters, these are often cheap but lack in efficiency and versatility. Radiant space heaters transfer heat directly to bodies
Space_heater
Liquid additive
Elsevier Evaluation of Certain Food Additives and Contaminants (Technical Report Series). World Health Organization. 2002. p. 105. ISBN 92-4-120909-7. Hartwick
Antifreeze
Air conditioning system that allows for individual control of spaces
may supply hot water in a heat recovery configuration without affecting efficiency, and switch to heating mode (heat pump) during winter without additional
Variable_refrigerant_flow
Window protection with horizontal angled slats
system Infrared thermometer Intelligent buildings LonWorks Minimum efficiency reporting value (MERV) Normal temperature and pressure (NTP) OpenTherm Programmable
Louver
Treatment of air from kitchens
accumulate in the hood and ducts and block air inlets, leading to loss of efficiency and increasing fire risk. Be quiet and vibration-free. The design of an
Kitchen_ventilation
Use of liquid or gaseous water in heating or cooling systems
every valve at the same time, so that the system can work at maximal efficiency; this condition is known as a "balanced" system.[citation needed] In two-pipe
Hydronics
Refrigeration process
as supercritical carbon dioxide, known as R-744. These have similar efficiencies[citation needed] compared to existing CFC- and HFC-based compounds, and
Vapor-compression refrigeration
Vapor-compression_refrigeration
High-performance energy-efficiency building standard
(Passivhaus) is a voluntary building performance standard for very high energy efficiency and thermal comfort that substantially reduces a building’s carbon footprint
Passive_house
Aspects of fluid mechanics involving fluid flow
numbers. Restrictions depend on the power of the computer used and the efficiency of the solution algorithm. The results of DNS have been found to agree
Fluid_dynamics
System for condensing gas into liquid by cooling
system Infrared thermometer Intelligent buildings LonWorks Minimum efficiency reporting value (MERV) Normal temperature and pressure (NTP) OpenTherm Programmable
Condenser_(heat_transfer)
Architectural element for creating a draft
multiple directions. More sections reduce the flow rate, but increase the efficiency at suboptimal wind angles. If the wind hits the opening square-on, it
Windcatcher
Substance used to reduce or regulate the temperature of a system
undergo a phase transition, with the latent heat adding to the cooling efficiency. The latter, when used to achieve below-ambient temperature, is more commonly
Coolant
Ventilation grill with moving parts
(HVAC) system. The placement and size of registers is critical to HVAC efficiency. Register dampers are also important, and can serve a safety function
Register_(air_and_heating)
Component of HVAC systems
energy efficiency index (EEI), will set the bare minimum efficiency level at 0.27, and set the efficiency grading scale from this base value. The EU
High efficiency glandless circulating pump
High_efficiency_glandless_circulating_pump
Device that cools air through the evaporation of water
Furthermore, the device has a maximum efficiency of 55%, so its actual COP is much lower than this calculated value. However, regardless of these losses
Evaporative_cooler
Method of heat exchange in which convection drives pumpless circulation
the permafrost. A study published in 2006 by oil giant ConocoPhillips reports that Alaska's permafrost, upon which much of the state's infrastructure
Thermosiphon
Machine transforming a liquid into a gas
evaporation. Convective currents inside it also contribute to heat transfer efficiency. There are various evaporator designs suitable for different applications
Evaporator
Heat-transfer device that employs phase transition
Improving the efficiency of geothermal heating to prevent slippery roads during winter in cold climate zones. Increasing the efficiency of photovoltaic
Heat_pipe
Device which reduces humidity
is less effective. Highest efficiency is reached above 20 °C (68 °F) and 45% relative humidity. This relative humidity value is higher if the temperature
Dehumidifier
Refrigerator that uses a heat source
PMID 22401189. S2CID 6981288. Absorption Heat Pumps (Office of Energy Efficiency and Renewable Energy). Arizona Energy Explanation with diagrams Lithium-Bromide
Absorption_refrigerator
Damp proofing material in sheet form
and Slab - Building Science Podcast Donald, Wulfinghoff (1999). Energy Efficiency Manual: for everyone who uses energy, pays for utilities, designs and
Vapor_barrier
Working fluid in a refrigeration cycle
larger to do the job). Thus, a trade-off between energy efficiency and volumetric efficiency underlies the selection of a refrigerant. The refrigerant
Refrigerant
Method of reusing thermal energy in a building
the heat in the exhaust air and have significantly improved the energy efficiency of buildings. Energy recovery ventilation (ERV) is the energy recovery
Heat_recovery_ventilation
Study of gas-vapor mixtures
psychrometrics or psychrometry in Wiktionary, the free dictionary. Western Cooling Efficiency Center Psych: An Open Source Psychrometric Plug-in for Microsoft Excel
Psychrometrics
Device designed to create radiative heat
recommended blend ratio varying according to the expected minimum operating temperature. The efficiency of an infrared heater is a rating of the total energy
Infrared_heater
Device which rejects waste heat to the atmosphere through the cooling of a water stream
strength and minimum usage of material. The hyperboloid shape also aids in accelerating the upward convective air flow, improving cooling efficiency. These
Cooling_tower
Portable heater
system Infrared thermometer Intelligent buildings LonWorks Minimum efficiency reporting value (MERV) Normal temperature and pressure (NTP) OpenTherm Programmable
Salamander_heater
Registered trade name for halocarbon products
doi:10.1016/j.jpowsour.2018.10.017. Chao, Chung-chi (26 July 2022). "A case report of recreational use of inhaled Freon leading to acute hypoxemic respiratory
Freon
Topics referred to by the same term
5th–11th centuries Merv (film), an American romantic comedy film Minimum efficiency reporting value (MERV), a measurement scale for the effectiveness of air filters
Merv_(disambiguation)
Method of stirring a confined fluid to achieve equal temperatures
system Infrared thermometer Intelligent buildings LonWorks Minimum efficiency reporting value (MERV) Normal temperature and pressure (NTP) OpenTherm Programmable
Thermal_destratification
System to cool the air in a vehicle
of installing air conditioning and its effect during use on the fuel efficiency of a vehicle. Factors such as increased wind resistance, engine power
Automotive_air_conditioning
Mathematical models of heat pumps and refrigeration
flow rate, which in turn increases their size. Because of their lower efficiency and larger bulk, air cycle coolers are not often applied in terrestrial
Heat pump and refrigeration cycle
Heat_pump_and_refrigeration_cycle
Thermodynamic phase transition energy
evaporation is released as the liquid's sensible heat onto the surface. The large value of the enthalpy of condensation of water vapor is the reason that steam
Latent_heat
Machine used to produce air flow
Efficiency – Automation and Control". Design News. Informa. Archived from the original on 2010-12-27. Retrieved May 18, 2011. Fans (Technical report)
Fan_(machine)
Control system for heating, ventilation, and air conditioning equipment
system Infrared thermometer Intelligent buildings LonWorks Minimum efficiency reporting value (MERV) Normal temperature and pressure (NTP) OpenTherm Programmable
HVAC_control_system
HVAC device
apparent relative complexity, becoming more popular is their improved energy efficiency levels compared to their AC motor-driven counterparts of only a few years
Fan_coil_unit
Concept in architectural and engineering practice
indoor air quality (hygiene and public health), durability and energy efficiency. In order to achieve these objectives, all building enclosure systems
Building_envelope
System to transfer heat to/from the ground
using less energy than that consumed by resistive electric heaters. Efficiency is given as a coefficient of performance (CoP) which is typically in the
Ground_source_heat_pump
Air quality within and around buildings and structures
not improve indoor air quality: a review and analysis of reported VOC removal efficiencies". Journal of Exposure Science & Environmental Epidemiology
Indoor_air_quality
Air conditioning technology
design helps optimize energy consumption and enhances overall cooling efficiency. The Inverter Linear Compressor category includes two distinct systems:
Inverter_compressor
Machine that removes heat from a liquid coolant
should range from 3.5 to 7.0, with higher values meaning higher efficiency. In the US, chiller efficiency is often specified in kilowatts per refrigeration
Chiller
Satisfaction with the thermal environment
that affect reported comfort. The adaptive model is limited to reporting differences (called psychological) between modeled and reported comfort.[citation
Thermal_comfort
Building design approach
large diurnal swing, i.e. a large difference between the daily maximum and minimum outdoor temperature. For optimal performance, the nighttime outdoor air
Passive_cooling
Use of a heat exchanger to recover energy and reuse heat from drain water
reason, many scholars look to water heat recycling as the future of energy efficiency for benefits both economical and environmental. The cold water that is
Water_heat_recycling
Filtration device
factors affect the efficiency of electrostatic precipitators: Larger collection-surface areas and lower gas-flow rates increase efficiency because of the
Electrostatic_precipitator
MINIMUM EFFICIENCY-REPORTING-VALUE
MINIMUM EFFICIENCY-REPORTING-VALUE
Boy/Male
Tamil
Ullasin | உலà¯à®²à®¾à®¸à¯€à®¨
Playing, Sporting
Ullasin | உலà¯à®²à®¾à®¸à¯€à®¨
Girl/Female
Gujarati, Indian
Efficient
Boy/Male
Arabic
Sufficiency; Competence
Boy/Male
Tamil
Rahulraj | ராஹà¯à®²à®°à®¾à®œ
Efficient, Capable
Rahulraj | ராஹà¯à®²à®°à®¾à®œ
Biblical
brightness; departing
Girl/Female
Tamil
Dakshhtha | தகà¯à®·à®¾à®¹à®¤à®¾
Efficiency, Care
Dakshhtha | தகà¯à®·à®¾à®¹à®¤à®¾
Boy/Male
Indian, Punjabi, Sanskrit, Sikh
Praisng; Repeating
Boy/Male
Hindu, Indian, Marathi
Delighting; Gratifying; Sporting
Girl/Female
Hindu, Indian, Marathi, Sanskrit
Sufficiency
Boy/Male
Muslim
Sufficiency. Competence.
Girl/Female
Christian, Gujarati, Hindu, Indian, Kannada, Marathi, Sindhi, Telugu
Wished-for Child
Girl/Female
Arabic
Efficient
Girl/Female
Hindu, Indian, Marathi, Sanskrit
Sporting; An Angel
Girl/Female
English, Hindu, Indian, Marathi
Small Daughter
Girl/Female
Indian, Sanskrit
Repeating; Goddess Durga
Biblical
revolting from God
Boy/Male
Hindu, Indian
Playing; Sporting
Boy/Male
Biblical
Revolting from God.
Girl/Female
Biblical
Brightness, departing.
Girl/Female
Indian
Efficiency, Care
MINIMUM EFFICIENCY-REPORTING-VALUE
MINIMUM EFFICIENCY-REPORTING-VALUE
Female
Japanese
(百åˆå) Japanese name YURIKO means "hundred-perfect-child."
Boy/Male
Tamil
Cinnamon tree
Girl/Female
Australian, Hindu, Indian
God Gift
Girl/Female
Muslim
Infallible. Free.
Male
Hebrew
(×—Ö¸× Ö¸×Ÿ) Hebrew name CHANAN means "compassionate, merciful." In the bible, this is the name of many characters, including a chief of the tribe of Benjamin. Canan and Hanan are Anglicized forms.
Boy/Male
Tamil
Male
Hungarian
Hungarian form of Greek Antonios, possibly ANTAL means "invaluable."Â
Girl/Female
English
and Kayla, meaning: keeper of the keys; pure.
Boy/Male
Tamil
Bright, Shining, Pleasant
Boy/Male
Scottish American Gaelic
bent nose.
MINIMUM EFFICIENCY-REPORTING-VALUE
MINIMUM EFFICIENCY-REPORTING-VALUE
MINIMUM EFFICIENCY-REPORTING-VALUE
MINIMUM EFFICIENCY-REPORTING-VALUE
MINIMUM EFFICIENCY-REPORTING-VALUE
n.
A minim.
n.
Conceit; self-confidence; self-sufficiency.
n.
The act of reexporting, or of exporting an import.
n.
A self-registering thermometer, especially one that registers the maximum and minimum during long periods.
n.
An efficient cause; a prime mover.
a.
Doing the same thing over again; accomplishing a given result many times in succession; as, a repeating firearm; a repeating watch.
a.
Causing abhorrence mixed with disgust; exciting extreme repugnance; loathsome; as, revolting cruelty.
n.
Joint efficiency; cooperation.
n.
Alt. of Efficiency
n.
The least quantity assignable, admissible, or possible, in a given case; hence, a thing of small consequence; -- opposed to maximum.
a.
Keeping a record or a register; as, a recording secretary; -- applied to numerous instruments with an automatic appliance which makes a record of their action; as, a recording gauge or telegraph.
n.
The quality of being inefficient; want of power or energy sufficient; want of power or energy sufficient for the desired effect; inefficacy; incapacity; as, he was discharged from his position for inefficiency.
pl.
of Minimus
n.
The greatest quantity or value attainable in a given case; or, the greatest value attained by a quantity which first increases and then begins to decrease; the highest point or degree; -- opposed to minimum.
a.
Reproving one's self; reproving by consciousness of guilt.
n.
Minimum.
a.
Greatest in quantity or highest in degree attainable or attained; as, a maximum consumption of fuel; maximum pressure; maximum heat.
n.
In a curve referred to polar coordinates, any point for which the radius vector is a maximum or minimum.
n.
The quality of being efficient or producing an effect or effects; efficient power; effectual agency.
pl.
of Minimum