Symbols
| English meaning | Symbol |
| Apparent extraterrestrial irradiation (W.m-2) | A |
| Absorption chiller | abc |
| Avoided cost ($) | AC |
| Collector area (m2) | Aco |
| Solar angular hour (deg) | AH |
| Analytic hierarchy process | AHP |
| Ambient | amb |
| Annual saving | AS |
| Aggregated thermal demand (kW) | ATD |
| Azimuth angle (deg) | az |
| Atmospheric extinction coefficient (-) | B |
| Boiler | b |
| Boiler size (kW) | B |
| Buying electricity | be |
| Cooling load (kW) | C |
| Ratio of diffuse radiation on horizontal surface to direct normal irradiation (-) | C |
| Combined cooling, heating, and power | CCHP |
| Carbon dioxide emission | CDE |
| Cash flow (USD) | cf |
| Combined heating and power | CHP |
| Closeness number | CN |
| Collector | co |
| Coefficient of performance (%) | COP |
| Main criteria | Cr |
| Conventional separate production of energy | CSP |
| Combined weight | CW |
| Domestic hot water load (kW) | D |
| Decibel, dry bulb (temperature) | db |
| Building demand | dem |
| Diffuse radiation falling on a horizontal surface | dH |
| Day length (HR) | DL |
| Direct normal | DN |
| Diffuse radiation | dθ |
| Electricity (kW) | E |
| Electrical | e |
| Economic | EC |
| Entropy information method | EIM |
| Emission production mass (g) | Em |
| Easiness of maintenance in Iran | EMI |
| Environmental | EN |
| Earnings (USD) | er |
| Energy utilization factor | EUF |
| Expenses (USD) | ex |
| Exergy increase ratio (%) | EXIR |
| Fuel energy (kW) | F |
| Fuzzy algorithm | FA |
| Fan coil unit | FCU |
| Following electrical load | FEL |
| Fuel energy saving ratio (%) | FESR |
| Full load operation | FLO |
| Following seasonal load | FSL |
| Following thermal load | FTL |
| Angle factor between surface and Earth (-) | Fsg |
| Angle factor between the surface and sky (-) | Fss |
| Electricity grid | g |
| Natural gas | Gas |
| Grey incident approach | GIA |
| Grey incident grade | GIG |
| Enthalpy (kj.kg−1) | h |
| Heating load (kW) | H |
| Heat exchanger | HE |
| Hour | HR |
| Heat recovery steam generator | HRSG |
| Heat pump | hp |
| Pollution index (kg.MWh−1) | i |
| Price index (USD.kW−1) | i |
| Initial capital cost (USD) | I |
| Thermodynamic state | i |
| Exergy destruction rate (kW) | i |
| Internal combustion engine | IC |
| Import and export limitations | IEL |
| Input, output | in, out |
| The domestic hot water system is using the recoverable heat from the engine as well | intg-DHW |
| Operation and maintenance cost (USD) | IOM |
| Judgment matrix | J |
| Lifetime of project (year) | L |
| Latitude angle of collector position (deg) | LAT |
| Load ratio | LR |
| Prime mover options number | m |
| Mass flow rate (kg.s−1) |
|
| Maximum, minimum | max, min |
| Multicriteria decision-making | MCDM |
| Multicriteria sizing method | MCSM |
| Miscellaneous | ME |
| Micro-gas turbine | MGT |
| Maximum rectangle method | MRM |
| Normalized, day number in a year, time period | N |
| Number of decision-making criteria | n |
| Nominal (Equipment size) | nom |
| Number of units in the building | NOU |
| Net present value (RLS) | NPV |
| Overall | o |
| Optimum | opt |
| Organic Rankine cycle | ORC |
| Absorber plate of collector | p |
| Phosphoric acid fuel cell | PAFC |
| Payback period (year) | PB |
| Pairwise comparison matrix | PC |
| Proximity degree | PD |
| Primary energy consumption (kW) | PEC |
| Primary energy saving (kW) | PES |
| Power to heat ratio (-) | PHR |
| Prime mover | PM |
| Conventional power plant | pp |
| Heat (kW) | Q |
| Useful heat gained by collector (W.m−2) | qu |
| Interest rate of money (%) | r |
| CO2 emission ratio | R |
| Reflectance | re |
| Recoverable | rec |
| Relative humidity (%) | RH |
| Radiation intensity (W.m−2) | RI |
| Recoverable and solar | rs |
| Entropy of information | S |
| Specific entropy (kj.kg−1.K−1) | s |
| Subcriteria | Sc |
| Selling electricity | se |
| Separate production | sp |
| The domestic hot water system is not using the recoverable heat from the engine | sprt-DHW |
| Stirling engine | STR |
| Salvage value | SV |
| Summer, winter | sum, win |
| Tariff (USD.kWh−1) | t |
| Temperature (°C) | T |
| Thermally activated technology | TAT |
| Technological | TE |
| Total horizontal irradiation | tH |
| Thermal | th |
| Total solar irradiation | tθ |
| User friendliness for control and regulations | UFCR |
| Upward heat loss coefficient, W.m−2.K−1 | UL |
| Volume flow rate (liter.s−1) |
|
| Weight of each criterion or subcriterion | W |
| Work, power (kW) |
|
| Wet bulb (temperature) | wb |
| Water heater | wh |
| Water density (kg.liter−1) | ρwtr |
| Energy magnitude (power or heat) (kW) | x |
| Reduction ratio of X (%) | XRR |
| Number of time increments of a year | Y |
| Year number | y |
| Absorptance of plate (-) | α |
| Effectiveness (%) |  |
| Collector-sun azimuth angle (deg) | γ |
| Solar declination angle (deg) | δ |
| Thermodynamic first-law efficiency (%) | η |
| Incident angle (deg) | θ |
| Linear combination coefficient | λ |
| Distinguishing coefficient | ξ |
| Balance coefficient | μ |
| Exergy efficiency (%) | π |
| Collector tilt angle (deg) | Σ |
| Collector azimuth angle (deg) | ψ |
| Solar longitude (deg) | σ |
| Transmittance of cover (-) | τ |
| Exergy rate (kW) |
|
| Reflectance of the foreground (-) | ρg |
| Thermodynamic dead state (1 atm, 20°C) | 0 |
| AND, OR (logical symbols) |  , ∨ |
| Triangular fuzzy number components | (a,b,c) |
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