Toimivuskõvera koefitsient

chiller coefficient of performance (COP) is function of condensing temperature and evaporating temperature, data is in table form, COP= f (TempCon, TempEvp), COP = a2+b2*Tei+c2*Tei^2+d2*Tci+e2*Tci^2+f2*Tei*Tci