Frequently used abbreviations and shorthand guide

[Ludasmith]

Hi Everyone, I am getting into refrigeration in case I decide to change my carrear direction.

Reading through hese forums seems a mine of usefull information but reading some of the threads it seems that there are a lot of abbreviations used in the field.

Im all for shortening things down, particularly for forums such as this but could we start putting a list together of abbreviations and their meanings? It would make the forum an easier place for newcomers like myself.

Thanks, Luke

[Fri3Oil System]

Great idea!

[james10]

Lets make a start then
EXV- electronic expansion valve
TEV-thermostatic/thermal expansion valve
L/P-suction pressure/low pressure (sometimes called back pressure)
H/P-discharge pressure/high pressure (sometimes called delivery pressure)
O/P-oil pressure
Delta T- temperature difference
Delta P-pressure difference (delta represented by a triangle symbol)
S/H- superheat
S/C-subcooling
EPR-evaporator pressure regulator
SST-saturated suction temperature
SCT-saturated condensing temperature
SLT-suction line temperature
LLT-liquid line temperature
VRV-variable refrigerant volume (Daikin only)
VRF-variable refrigerant flow
*****-refrigerant
HFC-hydroflourocarbon
HCFC-hydrocloroflourocarbon
CFC-cloroflourocarbon
CARE REFRIGERANTS-hydrocarbons(flamable)
COP-coefficient of performance
GWP-global warming potential
ODP-ozone depleting potential
C&G 2079-the current qualification required in the uk to work on refrigeration and air conditioning equipment containing green house gases
KYOTO PROTOCOL-climate change police
HVAC-heating,ventilation and air conditioning
ACRIB-air conditioning/refrigeration industry board
IOR-institute of refrigeration


And probably a lot more all i can think of off the top of my head.

[Electric Rain]

PHE - Plate Heat Exchanger

Just learned that one. Heh.

[james10]

Office worker-Person/persons in office who call you out to a fault and spend the entire time telling you how to do your job insisting the unit is out of gas Grrrrrrrr

[shaaf]

hi dear

comp. compressor
cond. condensor
evap. evaporator
chl. chiller

[monkey spanners]

Bmt - bulk milk tank
Ibc - Ice bank control
Cch - Crank case heater

[frank]

OFN Oxygen Free Nitrogen
CCH Crank Case Heater
SOG Short of Gas
NO Normally Open
NC Normally Closed
DOL Direct on Line
DOA Dead on Arrival

[monkey spanners]

Totnbt - Tits or tyres, nothing but trouble.

[mikeref]

FDC, Forced draft coil. LLSV, liquid line solenoid valve. CPR, Cardiopulmonary resusutation... no.. Crankcase Pressure Regulator. RTFM (courtesy Chemi)..Read the #!$*&@ manual

[Tayters]

Word Up Luke,

Here are some Danfoss abbreviations worked out from one of their diagrams:

KVR - Condenser Pressure Regulator
KP15 - Combined HP/LP Switch
NRV - Non Return Valve
NRD - Differential Pressure Regulator
KVP - Evaporator Pressure Regulator
EVR - Solenoid Valve
TE - Expansion Valve
BM - Sut Off Valve
KVL - Crankcase Pressure Regulator
KP61 - Thermostat
MP - Oil Pressure Differential Switch
DX - Drier
SGI - Sight Glass
AKV - Electronic Expansion Valve

Cheers,

Andy.

[james10]

HGD-Hot gas defrost
DEF-Defrost
CHW-chilled water

[superswill]

A heat transfer surface area, sq ft
C air flow, cfm
Cc coil air flow rate, cfm
CLF Cooling load factor
CLTD cooling load temperature difference, F
Coa ventilation (outdoor air) air flow rate, cfm
Cr return air flow rate, cfm
Ed diffuse solar radiation on a surface
ED direct solar radiation on a surface
eh coil entering enthalpy, btu/lb dry air
Er reflected solar radiation on a surface
h enthalpy, btu/lb dry air
hent coil entering air enthalpy, btu/lb dry air
hlv coil leaving enthalpy, btu/lb dry air
hr room air enthalpy, btu/lb dry air
hrrs room required supply air enthalpy, btu/lb dry air
K factor to correct CLTD for color
LM correction to CLTD for month and latitude, F
odb outdoor dry bulb temperature, F
owb outdoor wet bulb temperature, F
q local instantaneous heat gain or loss, Btu per hour
Q space cooling load, Btu per hour
Qrs room sensible cooling load
Qrt room total cooling load
Qscc Sensible Cooling Capacity of an air conditioning System
Qtcc Total Cooling Capacity of an air conditioning System
rdb room dry bulb temperature, F
renth room enthalpy, Btu per pound of dry air
rrsh room required supply enthalpy
RSCL room sensible cooling load
RTCL room total cooling load
rwb room wet bulb temperature, F
SC shading coefficient, modifies solar heat gain factor
SCC Sensible Cooling Capacity of an air conditioning System
SCL Sensible Cooling Load
SHGC solar heat gain coefficient
SHGF solar heat gain factor, function of latitude, month, orientation
TCC total cooling capacity of an air conditioning system
TCL total cooling load
TD temperature difference between rooms or spaces.
tdp dew point temperature, F
tedb, edb coil entering dry bulb temperature, F
tewb, ewb coil entering wet bulb temperature, F
tldb, ldb coil leaving dry bulb temperature, F
tlwb, lwb coil leaving wet bulb temperature, F
to average outdoor ambient temperature, F
tr, trdb return air dry bulb temperature, F (usually = trm)
trm room dry bulb temperature, F
trsdb room required supply dry bulb
trswb room required supply wet bulb
trwb return air wet bulb temperature, F (also room wet bulb)
ts sol-air temperature, F
U overall coefficient of heat transfer, Btu/(hr*ft2 *F)


didnt come out very well when copy and pasted from word doc sorry