Annual PVT Calculator
Address:
Load Weather Data
Tilt Angle (deg):
Surface Azimuth Angle (deg):
Ground Albedo (0-1):
Collector / PV Area A (m²):
Flow Rate (L/s/m²):
PV efficiency η (0–1):
Inlet temperature Tin (°C):
PVT Thermal Efficiency Model
Model A
— Simple linear (existing)
Model B
— ISO 9806 full model (Eq.12)
η_th = a0 + a1 × ((Tin − Ta) / G) + a2 × v_wind
a0 (peak efficiency η₀):
a1 — heat loss coeff (W/m²K):
a2 — wind speed coeff:
η
th
= η
0,hem
− a1·(T
m
−T
a
)/G − a2·(T
m
−T
a
)²/G − a3·u·(T
m
−T
a
)/G + a4·(E
L
−σT
a
⁴)/G − a6·u− a8·(T
m
−T
a
)⁴/G
T
m
= (Tin + Tout)/2，iterated per hour. a3,a4,a6,a8 can be assumed as 0
η
0,hem
— peak efficiency:
a1 — heat loss coeff (W/m²K):
a2 — temp² loss coeff (W/m²K²):
a3 — wind×temp loss (J/m³K):
a4 — sky temp coeff (−):
a6 — wind×G coeff (s/m):
a8 — 4th order loss (W/m²K⁴):
Initial Tout guess (°C):
Max iterations (Newton):
Industry Thermal Demand (optional)
Industry:
— None (PVT supply only) —
Dairy Farm
Brewery
Hotel
Commercial Laundry
Throughput (L/year):
Economic Parameters
Electricity Price ($/kWh):
Natural Gas Price ($/MJ):
Boiler Efficiency (0–1):
CAPEX – Unit Cost ($/m²):
OPEX Rate (% of CAPEX / yr):
System Lifetime N (years):
Discount Rate r (%):
Select thermal processes:
Operating profile:
Profile type:
Flat annual demand
9–5, 5 day week
24/7 continuous
Startup ramp-up:
None
1 hour
2 hours
Calculate Annual PV + Thermal
⏳ This might take a few minutes.
Monthly Data (Charts & Tables)
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Ready.
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