perf - plat
- perfect combustion
- perfect gas
- perfect gas law
- perforated ceiling
- performance
- performance coefficient
- performance energy ratio
- performance factor
- performance factor refrigerating system
- performance rating
- periodic law
- peripheral data-processing device
- peripheral equipment
- perlite thermal insulation
- perm
- permafrost
- permeability
- permeance
- perspective drawing
- PF
- phase
- phase change
- phase-change material
- phon
- phosphorous pentoxide
- phosphorous pentoxide desiccant
- photometer
- photovoltaic
- photovoltaic cell
- physical laws
- physical properties
- PI
- PIC
- pickup load
- piezometer
- piggyback refrigerating system
- pilot duty
- pilot duty rating
- pilot valve
- pilot-controlled valve
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