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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
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
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
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
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
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
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
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
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
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
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
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
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): [better source needed] A more detailed discussion of accuracy
Vapour_pressure_of_water
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
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
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
Tank used in hot water systems
due to expansion and contraction of the water used for heat transfer. A minimum pressure of 28–34 kPa; 0.28–0.34 bar (4–5 psi) at the top of a closed hydronic
Expansion_tank
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
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
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
Standards organization
industry, government, and investors; Market intelligence reports including the Wohlers Report and specialized sector analyses; Technical expertise contributing
ASTM_International
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
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
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
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
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
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
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
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
American HVAC professional association
technical standards to improve building services engineering, energy efficiency, indoor air quality, and sustainable development. ASHRAE was founded in
ASHRAE
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
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
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
Ventilation using solar energy
system Infrared thermometer Intelligent buildings LonWorks Minimum efficiency reporting value (MERV) Normal temperature and pressure (NTP) OpenTherm Programmable
Solar_chimney
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)
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
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
Machine used to produce air flow
electrostatic potential Specific fan power – Parameter that quantifies the energy-efficiency of fan air-movement systems Waddle fan – Large centrifugal fans, used
Fan_(machine)
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
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
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
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
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
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
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 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
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
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
Refrigerator that uses a heat source
dominated the market, although this advantage was eroded by their much poorer efficiency. Also in the 1960s, absorption refrigeration saw a renaissance due to
Absorption_refrigerator
Movement of air through a building
Yong; Xiao, Yuan; Ye, Cheng; Yang, Wei (2021). "Analysis of Ventilation Efficiency and Effective Ventilation Flow Rate for Wind-driven Single-sided Ventilation
Cross_ventilation
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
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
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
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
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)
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
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 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
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
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
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
Delivery of chilled water to building needing cooling
cooling and heat extraction. This allows for a higher overall energy efficiency of the 19 MW system. In 2009, a district cooling system was installed
District_cooling
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
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
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
Home automation software
system Infrared thermometer Intelligent buildings LonWorks Minimum efficiency reporting value (MERV) Normal temperature and pressure (NTP) OpenTherm Programmable
Home_Assistant
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
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
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
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
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
Annual international event on June 26
Generation Cooling; highlighting innovative technologies that improve energy efficiency and promote sustainable practices going into the future. 2024 - Temperature
World_Refrigeration_Day
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
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
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)
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
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
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
Use of thermal energy storage in building design
system Infrared thermometer Intelligent buildings LonWorks Minimum efficiency reporting value (MERV) Normal temperature and pressure (NTP) OpenTherm Programmable
Thermal_mass
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
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
Using low external air temperatures to chill water
are ideal for sites which have limited space and can offer high energy efficiency levels. These units feature high quality components including scroll and
Free_cooling
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 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
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 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
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
Ventilation without use of mechanical systems
recovery with an efficiency around 40%. The device was however found to be too large and heavy to be practical, and the heat recovery efficiency too low to
Passive_ventilation
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
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
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)
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
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
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
Passive solar building
these reasons, today's buildings are expected to achieve both energy efficiency and environmental-friendly design through the use of renewable energy
Trombe_wall
Measure of the air volume added to or removed from a space
enclosure's air which is exchanged in a period depends on the airflow efficiency of the enclosure and the methods used to ventilate it. These systems range
Air_changes_per_hour
MINIMUM EFFICIENCY-REPORTING-VALUE
MINIMUM EFFICIENCY-REPORTING-VALUE
Girl/Female
Arabic
Efficient
Girl/Female
Tamil
Dakshhtha | தகà¯à®·à®¾à®¹à®¤à®¾
Efficiency, Care
Dakshhtha | தகà¯à®·à®¾à®¹à®¤à®¾
Boy/Male
Hindu, Indian, Marathi
Delighting; Gratifying; Sporting
Girl/Female
Christian, Gujarati, Hindu, Indian, Kannada, Marathi, Sindhi, Telugu
Wished-for Child
Biblical
brightness; departing
Boy/Male
Biblical
Revolting from God.
Girl/Female
Hindu, Indian, Marathi, Sanskrit
Sufficiency
Girl/Female
Indian, Sanskrit
Repeating; Goddess Durga
Girl/Female
Hindu, Indian, Marathi, Sanskrit
Sporting; An Angel
Biblical
revolting from God
Boy/Male
Indian, Punjabi, Sanskrit, Sikh
Praisng; Repeating
Boy/Male
Tamil
Ullasin | உலà¯à®²à®¾à®¸à¯€à®¨
Playing, Sporting
Ullasin | உலà¯à®²à®¾à®¸à¯€à®¨
Boy/Male
Arabic
Sufficiency; Competence
Boy/Male
Hindu, Indian
Playing; Sporting
Girl/Female
Gujarati, Indian
Efficient
Girl/Female
English, Hindu, Indian, Marathi
Small Daughter
Boy/Male
Tamil
Rahulraj | ராஹà¯à®²à®°à®¾à®œ
Efficient, Capable
Rahulraj | ராஹà¯à®²à®°à®¾à®œ
Boy/Male
Muslim
Sufficiency. Competence.
Girl/Female
Indian
Efficiency, Care
Girl/Female
Biblical
Brightness, departing.
MINIMUM EFFICIENCY-REPORTING-VALUE
MINIMUM EFFICIENCY-REPORTING-VALUE
Boy/Male
English German
A which originated as a rhyming.
Surname or Lastname
English
English : variant spelling of Edgar.
Boy/Male
Assamese, Christian, Hindu, Indian, Kannada, Malayalam, Marathi, Tamil, Telugu
Kindness; Softness; Love
Boy/Male
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Mythological, Sanskrit, Tamil, Telugu, Thai
The God of Ramayana
Boy/Male
Biblical
A treasurer.
Boy/Male
Indian, Sanskrit
Protector of Living Beings; Spirits
Boy/Male
Muslim
Precious. Exquisite.
Boy/Male
Hawaiian
Counselor; advisor.
Girl/Female
Muslim
Boy/Male
American, British, English, German
Friend of the North
MINIMUM EFFICIENCY-REPORTING-VALUE
MINIMUM EFFICIENCY-REPORTING-VALUE
MINIMUM EFFICIENCY-REPORTING-VALUE
MINIMUM EFFICIENCY-REPORTING-VALUE
MINIMUM EFFICIENCY-REPORTING-VALUE
a.
Greatest in quantity or highest in degree attainable or attained; as, a maximum consumption of fuel; maximum pressure; maximum heat.
n.
Conceit; self-confidence; self-sufficiency.
a.
Reproving one's self; reproving by consciousness of guilt.
pl.
of Minimum
n.
An efficient cause; a prime mover.
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.
Joint efficiency; cooperation.
n.
Alt. of Efficiency
pl.
of Minimus
n.
A self-registering thermometer, especially one that registers the maximum and minimum during long periods.
n.
The quality of being efficient or producing an effect or effects; efficient power; effectual agency.
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.
a.
Causing abhorrence mixed with disgust; exciting extreme repugnance; loathsome; as, revolting cruelty.
a.
Doing the same thing over again; accomplishing a given result many times in succession; as, a repeating firearm; a repeating watch.
n.
The act of reexporting, or of exporting an import.
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.
n.
In a curve referred to polar coordinates, any point for which the radius vector is a maximum or minimum.
n.
A minim.
n.
The least quantity assignable, admissible, or possible, in a given case; hence, a thing of small consequence; -- opposed to maximum.
n.
Minimum.