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Air conditioning system that allows for individual control of spaces
Variable refrigerant flow (VRF), is an HVAC technology invented by Daikin Industries, Ltd. in 1982. Daikin Industries, Ltd. named this "VRV" and holds
Variable_refrigerant_flow
Cooling of air in an enclosed space
also invented by Daikin in 1982. Both were first sold in Japan. Variable refrigerant flow systems when compared with central plant cooling from an air handler
Air_conditioning
Working fluid in a refrigeration cycle
the refrigerant in an air conditioner carries heat from a cool indoor environment to a hotter outdoor environment. Similarly, the refrigerant in a kitchen
Refrigerant
Recycling of refrigerant gas
Refrigerant reclamation is the act of processing used refrigerant gas which has previously been used in some type of refrigeration loop to meet the specifications
Refrigerant_reclamation
Component of air conditioning and refrigeration systems
controls the amount of refrigerant released into the evaporator and is intended to regulate the superheat of the refrigerant that flows out of the evaporator
Thermal_expansion_valve
Heating or air-conditioning system
over-cooling. The air blower's flow rate is variable. For a single VAV air handler that serves multiple thermal zones, the flow rate to each zone must be varied
Variable_air_volume
Aspects of fluid mechanics involving fluid flow
surface gradients are small. Darcy's law is used for flow in porous media, and works with variables averaged over several pore-widths. In rotating systems
Fluid_dynamics
Machine to increase pressure of gas by reducing its volume
This type of compressor can compress a wide range of gases, including refrigerant, hydrogen, and natural gas. Because of this, it finds use in a wide range
Compressor
Device that changes direct current (DC) to alternating current (AC)
be used to control the speed of the compressor motor to drive variable refrigerant flow in a refrigeration or air conditioning system to regulate system
Power_inverter
Type of heating, ventilation and air-conditioning system
panels A parallel all air variable-air-volume (VAV) systems Packaged unitary water source heat pumps Variable Refrigerant Flow (VRF) systems Fan coil units
Dedicated_outdoor_air_system
Machine that removes heat from a liquid coolant
or refrigerant metering device (RMD) restricts the flow of the liquid refrigerant causing a pressure drop that vaporizes some of the refrigerant; this
Chiller
Refrigeration process
refrigeration or vapor-compression refrigeration system (VCRS), in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and
Vapor-compression refrigeration
Vapor-compression_refrigeration
Technology of indoor and vehicular environmental comfort
(also called metering device) regulates the refrigerant liquid to flow at the proper rate. The liquid refrigerant is returned to another heat exchanger where
Heating, ventilation, and air conditioning
Heating,_ventilation,_and_air_conditioning
Refrigerator that uses a heat source
narrow tube; the bubbles of refrigerant gas push the refrigerant-depleted liquid into a higher chamber, from which it will flow by gravity to the absorption
Absorption_refrigerator
American HVAC professional association
recovery and humidity control; a ground-source heat pump system; and variable refrigerant flow systems with heat recovery. The building also serves as a live
ASHRAE
System that transfers heat from one space to another
gaseous refrigerant is compressed so its pressure and temperature rise. When the pump operates as a heater in cold weather, the warmed gas flows to a heat
Heat_pump
System to cool the air in a vehicle
a variable displacement compressor, its displacement; additionally, a secondary valve located on the suction side can throttle the refrigerant flow so
Automotive_air_conditioning
space conditioning unit from the conditioned space. A refrigerant valve that reverses refrigerant flow to determine whether system is heating or cooling On
Glossary of geothermal heating and cooling
Glossary_of_geothermal_heating_and_cooling
Air conditioning technology
helps to secure the process while providing greater efficiency. Variable refrigerant flow (VRF) VRF units are very popular cooling or reversible systems
Inverter_compressor
Mathematical models of heat pumps and refrigeration
refrigerant enters the compressor as a low pressure and low temperature saturated vapor. In heat pumps, this refrigerant is typically R32 refrigerant
Heat pump and refrigeration cycle
Heat_pump_and_refrigeration_cycle
Conduit used in heating, ventilation, and air conditioning
automatic. Zone dampers provide automatic control in simple systems while variable air volume (VAV) allows control in sophisticated systems. Smoke dampers
Duct_(flow)
Equipment used to transfer heat between fluids
water and refrigerant are most common. Chilled water is supplied from a chiller that is potentially located very far away, but refrigerant must come from
Heat_exchanger
System for condensing gas into liquid by cooling
variables including the working fluid, the secondary fluid, the geometry, and the material. Common secondary fluids include water, air, refrigerants,
Condenser_(heat_transfer)
Machine used to produce air flow
revolving vane, or vanes used for producing currents of air. Fans produce air flows with high volume and low pressure (although higher than ambient pressure)
Fan_(machine)
Device used to regulate and circulate air as part of an HVAC system
by evaporation of the refrigerant, and released at the other side, by condensation of the refrigerant. Condensed refrigerant flows by gravity to the first
Air_handler
Absorption refrigerator invented in 1930
moving parts made it more reliable; the introduction of Freon to replace refrigerant gases toxic to humans made it even less attractive commercially. The
Einstein_refrigerator
Valve or plate for regulating airflow
A damper is a valve or plate that stops or regulates the flow of air inside a duct, chimney, VAV box, air handler, or other air-handling equipment. A damper
Damper_(flow)
Control system for heating, ventilation, and air conditioning equipment
air were used to control the flow of heated or cooled air via mechanically controlled logic. After the control of air flow and temperature was standardized
HVAC_control_system
Concept in physics
height of the building and A is the flow area of the openings. For multi-floor, high-rise buildings, A is the flow area of the openings and h is the distance
Stack_effect
Japanese heating systems company
Electric Corporation to Establish Joint Venture for Ductless and Variable Refrigerant Flow Heating and Air Conditioning Systems in the U.S. and Select Latin
Mitsubishi Electric Trane HVAC
Mitsubishi_Electric_Trane_HVAC
Portable heater
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Salamander_heater
Heating of air in buildings or vehicles
Heat pumps can be used for heating and cooling, transferring heat using refrigerant and electricity, making them more efficient than other heating systems
Heating_system
HVAC system
still provide heat when coping with temperatures below 0 °C (32 °F). A refrigerant coil is located in the air handler instead of a burner/heat exchanger
Forced-air
Valve that reverses flow direction in part of a circuit
component in a heat pump, that changes the direction of refrigerant flow. By reversing the flow of refrigerant, the heat pump refrigeration cycle is changed from
Reversing_valve
Registered trade name for halocarbon products
nonflammable, low toxicity gases or liquids which have generally been used as refrigerants and as aerosol propellants. They include chlorofluorocarbons (CFCs) and
Freon
Type of home appliance that clears smoke from a stove
accordance with UL 1046, Standard for Grease Filters for Exhaust Ducts. Hood air flow is measured in liters per second (L/s), cubic meters per second (m3/s), or
Kitchen_hood
Refrigeration method
sorption. In adsorption refrigeration, adsorbate vapour molecules, the refrigerant, adsorb onto the surface of a solid instead of dissolving into a liquid
Adsorption_refrigeration
Type of heat pump
use only a single fluid which is a refrigerant. In contrast, absorption heat pump requires two fluids, a refrigerant and an absorbent able to absorb it
Absorption-compression heat pump
Absorption-compression_heat_pump
Heat transfer due to the movement of fluid
of conduction (heat diffusion) and advection (heat transfer by bulk fluid flow). Convection is usually the dominant form of heat transfer in liquids and
Convection_(heat_transfer)
Cooling commodity
medium used for rejecting heat from the air. Instead of a low-pressure refrigerant, chilled water cooling uses water to cool the air. Regardless of who
Chilled_water
Topics referred to by the same term
VRF may refer to: Variable refrigerant flow, for heating and cooling Verifiable random function, in cryptography Virtual routing and forwarding Vitiligo
VRF
Instrument for the measurement of carbon dioxide gas
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Carbon_dioxide_sensor
Substance used to reduce or regulate the temperature of a system
used to achieve below-ambient temperature, is more commonly known as refrigerant. A coolant reservoir captures overflow of coolant in a cooling system
Coolant
Method of heat exchange in which convection drives pumpless circulation
resistance so that liquid can flow easily under the relatively low pressure produced by natural convection. In some situations the flow of liquid may be reduced
Thermosiphon
HVAC device
with chillers. The thermostat controls the fan speed and/or the flow of water or refrigerant to the heat exchanger using a control valve. Due to their simplicity
Fan_coil_unit
Cooling system that uses solar power
plugged in. Both of these systems make use variable refrigerant flow technology, with high-efficiency variable-speed DC motors and compressors to require
Solar_air_conditioning
Cooling output divided by electricity input, as a standard for HVAC systems
and multiple compressors, with some also having variable refrigerant flow and variable supply air flow. In 1987 legislation taking effect in 1992 was passed
Seasonal energy efficiency ratio
Seasonal_energy_efficiency_ratio
Gas compressor where the piston is driven by a linear actuator
current flow to the electromagnet, letting the spring uncompress, moving the piston forward, and compressing the refrigerant. The compressed refrigerant is
Linear_compressor
Machine transforming a liquid into a gas
components of an evaporator assembly are: Tubes or channels where the refrigerant liquid is circulated Fins or other enhanced surfaces to increase heat
Evaporator
Window protection with horizontal angled slats
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Louver
Heat-transfer device that employs phase transition
side mounted over the exhaust-air side, which allows the liquid refrigerant to flow quickly back to the evaporator aided by the force of gravity. Gross
Heat_pipe
Thermodynamic phase transition energy
of vaporization (boiling). These names describe the direction of energy flow when changing from one phase to the next: from solid to liquid, and liquid
Latent_heat
Concept in architectural and engineering practice
Support (to resist and transfer structural and dynamic loads) Control (the flow of matter and energy of all types) Finish (to meet desired aesthetics on
Building_envelope
Release of a gas that was inside of some material
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Outgassing
Component of central heating and cooling systems
distribution of the flow in the system. In a variable primary chilled-water system, the design flow rate is determined by the water flow velocity in the tube
Automatic_balancing_valve
piece of equipment that meters the flow of liquid refrigerant into the evaporator while measuring the vapor refrigerant leaving the evaporator. It thereby
Glossary_of_HVAC_terms
Use of liquid or gaseous water in heating or cooling systems
and cooling systems. The name differentiates such systems from oil and refrigerant systems. Historically, in large-scale commercial buildings such as high-rise
Hydronics
Physics of heat, work, and temperature
the system arrived at its state. They are called intensive variables or extensive variables according to how they change when the size of the system changes
Thermodynamics
Heat exchanged by a body or thermodynamic system
system, and some macroscopic variables of the body or system, but leaves unchanged certain other macroscopic variables of the body or system, such as
Sensible_heat
Part of a building hosting air circulation for heating and air conditioning systems
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Plenum_space
Building automation network
International, and each standard parameter is known as Standard Network Variable Type (SNVT, pronounced "sniv-it.") For example, a thermostat might report
LonWorks
Range of indoor air temperatures preferred by most people
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Room_temperature
System to transfer heat to/from the ground
where the refrigerant itself is passed through the ground loop. Developed during the 1980s, this approach faced issues with the refrigerant and oil management
Ground_source_heat_pump
Space in a building dedicated to the mechanical equipment
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Mechanical_room
Thermal engineering discipline concerning transfer of heat in physical systems
flow of air over the radiator's surface. Common types of heat exchanger flows include parallel flow, counter flow, and cross flow. In parallel flow,
Heat_transfer
Concentration of water vapour in the air
technical processes. While humidity itself is a climate variable, it also affects other climate variables. Environmental humidity is affected by winds and by
Humidity
Total energy consumption of single household
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Domestic_energy_consumption
Treatment of air from kitchens
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Kitchen_ventilation
High-performance energy-efficiency building standard
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Passive_house
Process of using ice for thermal energy storage
technology uses ice as a condensing medium for the refrigerant. In this case, regular refrigerant is pumped to coils where it is used. Rather than needing
Ice_storage_air_conditioning
Measure of energy in a thermodynamic system
and several extensive state variables. The state variables S[p], p, and {Ni} are said to be the natural state variables in this representation. They
Enthalpy
Temperature sensing device
reversing the refrigerant flow and using some building heat to thaw a freon-to-liquid heat exchanger and then restoring the refrigerant flow to its normal
Freeze_stat
Household appliance that heats a single room or other small area
variations in an environment generate fluid flow. Forced-convection heaters utilize a device like a fan to generate air flow and spread heat at a fast pace. Sometimes
Space_heater
Fan used to cool an attic space
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Attic_fan
Temperature control system
needed] The heat pump is a refrigeration based appliance which reverses refrigerant flow between the indoor and outdoor coils. This is done by energizing a
Thermostat
Type of convection heater
heat-transfer oil flows freely around the heater. A heating element at the base of the heater heats the diathermic oil, which flows around the cavities
Oil_heater
Wall-mounted air conditioning system
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Packaged terminal air conditioner
Packaged_terminal_air_conditioner
North American trade association
Low-GWP Alternative Refrigerants Report". Retrieved 7 July 2017. Writer, Jim Walsh, AFN Staff (5 July 2017). "Banned refrigerant impacting Ahwatukee heat-pump
Air Conditioning, Heating and Refrigeration Institute
Air_Conditioning,_Heating_and_Refrigeration_Institute
South Korean multinational electronics company
with production facilities in Norway and Sweden. LG produces variable refrigerant flow (VRF) systems for commercial buildings under the Multi V brand
LG_Electronics
Air compressor
scroll pump and scroll vacuum pump) is a device for compressing air or refrigerant. It is used in air conditioning equipment, as an automobile supercharger
Scroll_compressor
Device which removes solid particulates from the air
into the cabin air stream. Since the cabin air temperature depends upon the flow rate of the air passing through the heater core, the evaporator, or both
Air_filter
Device used to prevent air from moving from one open space to another
door will have a high face velocity at the opening, generated by top-down flow, and air recovery by a recirculating air plenum and duct return to the source
Air_door
Process of moving heat from one location to another in controlled conditions
describing the "process" of refrigerant flow through an HVACR unit, whether it is a packaged or split system. Heat naturally flows from hot to cold. Work is
Refrigeration
Chemistry concept
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Dilution_(equation)
Flow-control device
control fluid flow by varying the size of the flow passage as directed by a signal from a controller. This enables the direct control of flow rate and the
Control_valve
Use of a heat exchanger to recover energy and reuse heat from drain water
gathered by the condenser water loop from the refrigerant to a cooling tower. By diverting a fraction of mass flow rate of condenser water away from the cooling
Water_heat_recycling
Engineering discipline
transport phenomena to study heat transfer, combustion, and compressible fluid flow in engineered systems. Mechanical engineers use thermal engineering to design
Mechanical_engineering
Type of local ventilation device
some programs combine the principles of "Shut the Sash" campaigns with variable flow ventilation by using technology to actively remind users to close the
Fume_hood
Most common type of heat pump
heat exchanger coil, which extracts heat from ambient air Pipes with refrigerant fluid/gas connecting the units One or more indoor condenser heat exchanger
Air_source_heat_pump
Intentional introduction of outside air into a space
is typically described as separate from infiltration, the circumstantial flow of air from outdoors to indoors through leaks (unplanned openings) in a building
Ventilation_(architecture)
Measurement scale for the effectiveness of air filters
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Minimum efficiency reporting value
Minimum_efficiency_reporting_value
Ventilation without use of mechanical systems
from an indoor space without using mechanical systems. It refers to the flow of external air to an indoor space as a result of pressure differences arising
Passive_ventilation
Architectural element for creating a draft
have only one opening, and no internal partitions. In areas with more variable wind directions, there may also be radial internal walls, which divide
Windcatcher
Efficiency standard of air filters
system. Face velocity is measured in m/s and can be calculated as the volume flow rate (m3/s) divided by the face area (m2). The air space between HEPA filter
HEPA
Device which rejects waste heat to the atmosphere through the cooling of a water stream
pumps and maintenance while in use. Non-pressurized spray simplifies variable flow. Typically lower initial and long-term cost, mostly due to pump requirements
Cooling_tower
Electrical device to ionise air molecules
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Air_ioniser
Organic chemicals having a high vapor pressure at room temperature
methods have used proprietary Silcosteel-coated canisters with constant flow inlets to collect samples over several days. These methods are not limited
Volatile_organic_compound
Heat exchanger
and maximizes the volume in which the refrigerant changes its phase (phenomena involving much more heat flow, the base principle of vapor-compression
Economizer
Seal around openings in a fire-resistance-rated wall or floor
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
Firestop
Standards organization
Vapor barrier Vapor-compression refrigeration (VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components
ASTM_International
VARIABLE REFRIGERANT-FLOW
VARIABLE REFRIGERANT-FLOW
Boy/Male
Arabic, Indian, Muslim
Valuable
Girl/Female
Christian & English(British/American/Australian)
Amiable
Girl/Female
Indian
Valuable
Boy/Male
Hindi
Valuable.
Girl/Female
Tamil
Valuable
Girl/Female
Armenian
Valuable.
Boy/Male
Hindu, Indian
Valuable
Surname or Lastname
English
English : from the feminine personal name Mirabel, equated in medieval records with Latin mirabilis ‘marvellous’, ‘wonderful’ (in the sense ‘extraordinary’).
Girl/Female
Gujarati, Hindu, Indian
Valuable
Boy/Male
Tamil
Amiable
Boy/Male
Anglo, British, English
Variable
Boy/Male
Arabic, Bengali, Hindu, Indian, Kannada, Marathi, Muslim, Telugu
Valuable
Male
Danish
, amiable.
Boy/Male
Hindu
Amiable
Boy/Male
Hawaiian
Valuable.
Girl/Female
Assamese, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Valuable
Male
Danish
, amiable.
Boy/Male
Vietnamese
Valuable.
Boy/Male
Greek
Amiable.
Male
Dutch
, amiable.
VARIABLE REFRIGERANT-FLOW
VARIABLE REFRIGERANT-FLOW
Female
French
French form of Latin Constantia, CUSTANCE means "steadfast."Â
Boy/Male
Muslim
Abundance from Allah
Girl/Female
Hindu, Indian, Traditional
Fraganance
Boy/Male
Hindu
Beautiful
Girl/Female
Assamese, Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Oriya, Sindhi, Tamil, Telugu
East; Elder; Name of a Nakshatra; Breeze
Girl/Female
Muslim
Nightingale
Girl/Female
Tamil
Taluni | தாலà¯à®‚நீ
Young
Boy/Male
Hindu
Lord Shiva
Boy/Male
Biblical
Hope, or congregation, of the Lord.
Boy/Male
African, Dutch, French, German, Teutonic
Born on the Road
VARIABLE REFRIGERANT-FLOW
VARIABLE REFRIGERANT-FLOW
VARIABLE REFRIGERANT-FLOW
VARIABLE REFRIGERANT-FLOW
VARIABLE REFRIGERANT-FLOW
a.
Liable to vary; too susceptible of change; mutable; fickle; unsteady; inconstant; as, the affections of men are variable; passions are variable.
a.
Invariable.
n.
Arable land; plow land.
a.
Cooling; allaying heat or fever.
p. pr. & vb. n.
of Refrigerate
n.
A refrigerant.
imp. & p. p.
of Refrigerate
n.
An invariable quantity; a constant.
a.
Possessing sweetness of disposition; having sweetness of temper, kind-heartedness, etc., which causes one to be liked; as, an amiable woman.
n.
That which makes to be cool or cold; specifically, a medicine or an application for allaying fever, or the symptoms of fever; -- used also figuratively.
a.
Worthy; estimable; deserving esteem; as, a valuable friend; a valuable companion.
n.
That which is variable; that which varies, or is subject to change.
n.
A quantity which may increase or decrease; a quantity which admits of an infinite number of values in the same expression; a variable quantity; as, in the equation x2 - y2 = R2, x and y are variables.
adv.
In a variable manner.
a.
Friendly; kindly; sweet; gracious; as, an amiable temper or mood; amiable ideas.
a.
Liable to undergo a judicial examination; properly coming under the cognizance of a court; as, a cause may be triable before one court which is not triable in another.
a.
Having the capacity of varying or changing; capable of alternation in any manner; changeable; as, variable winds or seasons; a variable quantity.
v. t.
To represent by parable.
a.
Arable; tillable.
a.
Having value or worth; possessing qualities which are useful and esteemed; precious; costly; as, a valuable horse; valuable land; a valuable cargo.