R

Same as brush house.

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

See bead and reel.

An internal angle usually less than 90.

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

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

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

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

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 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.

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.

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.

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. 

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

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

Same as reflectance.
 

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

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.

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

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.

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.

A photometer for measuring the reflectance of a material.

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.

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

valve See check valve.

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

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

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

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

A brick capable of with- standing high temperatures.

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

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

Refractory concrete having low thermal conductivity.

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

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

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

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.

The quantity of refrigerant in a refrigeration system.

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.

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

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.

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.

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.

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

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

The depth below which a pile cannot be driven.

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

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.

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.

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