Architectural and Engineering Glossary

R

Reed House

Same as brush house.

Reeding

An ornament of adjacent,parallel,protruding,half round moldings (reeds);the reverse of fluting.Also see cabling.

Reel And Bead

See bead and reel.

Reentrant Angle

An internal angle usually less than 90.

Reentrant Corner

An internal or inside corner;usually used to describe angles less than 90. 

REF

On drawings,abbr.for “refer” or “reference.” 

Refectory

A hall in a convent,monastery,or public secular institution where meals are eaten. 

Reference Line

Any line which can serve as a reference or base for the measurement of other quantities.
 

Reference Mark

A supplementary mark of permanent character close to a survey station,to which it is related by an accurately measured distance and azimuth (or bearing);the connection between a survey station and its reference mark or marks must be of sufficient precision and accuracy to permit the reestablishment of the station on the ground from its marks.
 

Reference Standard Specification

reference standard specification A nonproprietary specification based on accepted standards,or on requirements set by an acceptable authority,which describes products,materials,or pieces of equipment to be incorporated in a building project.

Reference Standards

Technical and generic data published by a technically competent organization (such as the ASTM or BRE) that are generally accepted by the building construction industry;they provide acceptability criteria by which products or materials may be evaluated.

Reference Temperature

In the definition for degree day,an indoor temperature of 65F (18.3C) in the US, or 60(15.6C) in Britain.

Refined Tar

1.Tar from which water has been evaporated or distilled until a desired consistency is reached.2.A bituminous product produced by fluxing tar residuum with tar distillate. 

Reflash

The reignition of a flammable material by a hot source after the flames have been extinguished.

Reflectance

The ratio of the reflected flux to the flux incident on a surface.

Reflectance Coefficient,reflectance Factor

Same as reflectance.
 

Reflected Glare

Glare resulting from specular reflection of high brightness in polished or glossy surfaces in the field of view.Also see specular surface.

Reflected Plan

A plan,viewed from above,laid out as if it were projected downward on an upper surface (such as a ceiling);thus a member seen on the left from below appears to the right on the plan.

Reflection

The change of direction which a ray of light,sound,or radiant heat undergoes when it strikes a surface;also see law of reflection.

Reflective Glass

Window glass which has been coated on the outside with a transparent metallic coating to reflect a significant fraction of the light and radiant heat which strikes it.

Reflective Insulation

1.Thermal insulation in sheet form which has one or both surfaces faced with a reflective foil of comparatively low heat emissivity;used in building construction with a reflective surface facing an air space,to reduce the transfer of heat (by radiation) across the air space.2.Thermal insulation whose performance depends on the reduction of transfer of radiant heat across air spaces by the use of one or more surfaces having high thermal reflectance and low emittance.

Reflectometer

A photometer for measuring the reflectance of a material.

Reflector

1.A device that redirects light or sound by reflection.2.The device on a luminaire which controls the distribution of light from the lamp by reflection.

Reflector Lamp

An incandescent lamp in which part of the bulb serves as a reflector,e.g.,a PAR lamp.

Reflux

valve See check valve.

REFR

1.On drawings,abbr.for refractory.2.On drawings,abbr. for “refrigerate.”
 

Refraction

The change in direction of a light ray or a sound ray in passing from one medium to another.

Refractory

A material,usually nonmetallic,used to withstand high temperatures.

Refractory Aggregate

A material having refractory properties;when bound together into a conglomerate mass by a matrix, forms a refractory body.

Refractory Brick

A brick capable of with- standing high temperatures.

Refractory Cement

Cement esp.manufactured for use in furnace and oven linings;often a mixture of fireclay with crushed brick,silica sand,or sodium silicate.

Refractory Concrete

Concrete having refractory properties;suitable for use at high temperature;usually made with calcium aluminate cement and refractory aggregate.

Refractory Insulating Concrete

Refractory concrete having low thermal conductivity.

Refractory Insulation

Thermal insulation which may be used at temperatures above 1500F (816C).

Refractory Materials

Materials (such as bricks or blocks) that do not deform significantly or change chemically when subject to high temperatures.

Refractory Mortar

 A mortar having refractory properties that make it suitable for use at high temperatures

Refrigerant

The medium of heat transfer in a refrigeration system which absorbs heat by evaporation at low temperature and pressure and gives up heat on condensing at higher temperatures and pressures.

Refrigerant Charge

The quantity of refrigerant in a refrigeration system.

Refrigerant Compressor Unit

A packaged unit comprising a pump suitable for compressing refrigerant gas,associated controls and acces- sories,and a prime mover which may be an integral part of the compressor or mounted with the compressor on a common base.

Refrigerating Medium

Any substance whose temperature is such that it is used to lower the temperature of other bodies or substances below the ambient temperature.

Refrigeration

The process by which heat is absorbed from a body or substance by expansion or vaporization of a refrigerant,lowering its body temperature and maintaining the temperature below its surroundings.

Refrigeration Cycle

A repetitive sequence of thermodynamic processes in which a refrigerant absorbs heat from a controlled space at relatively low temperature;then the heat is rejected else- where at a higher temperature,and the process is repeated.

Refrigeration System

A closed-flow system in which a refrigerant is compressed,condensed,and expanded to produce cooling at a lower temperature level and rejection of heat at a higher temperature level for the purpose of extracting heat from a controlled space.

Refrigerator

A container and a means of cooling it,such as a commercial refrigerator,service refrigerator, etc.

Refurbish

To make fresh again without demolition and replacement of the original building; i.e.,to renovate.

Refusal

The depth below which a pile cannot be driven.

Refuse

An approximately even mixture of  garbage and rubbish by weight; contains up to 50% moisture and 7% incombustible  solids.Also see trash.

Refuse Chute

A means of transporting waste materials by chute,from the point of disposal in high-rise residential (or office building) to a refuse collection room at the base of the chute.See also gravity type refuse chute.

Refuse Compactor

A motor driven machine having a ram that reduces the volume of waste material by subjecting it to pressure and forcing it into a removable container or package.

REG

1.On drawings,abbr. for register.2.On drawings,abbr. for “regulator.”