Formler från Folkes övningar Flashcards

1
Q

Tryck

A

P = F / A

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2
Q

Arbete

A

W = F * s

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3
Q

Effekt

A

P = W / t = F * s / t

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4
Q

Byggnadens energibehov

A

E (timmen) = Q(tot) * ( T(inne) - T(ute) )

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5
Q

Värmeförlustfaktor

A

Q(tot) = Q(t) + Q(v)

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6
Q

Energibehov för uppvärmning under ett år

A

E(uppv) = Q(tot) * G(t)

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7
Q

COP2(carnot)

A

COP2(carnot) = T2 / (T1 - T2)

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8
Q

Värmefaktor

A

COP1 = q1 / εK

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9
Q

Köldfaktorn

A

COP2 = q2 / εK

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10
Q

Lägesenergi

A

E(pot) = m * g * h

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11
Q

Kinetisk energi

A

E(k) = ( m * v^2 ) / 2

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12
Q

Ideala gaslagen

A

p * V = n * R * T

R = Gaskonstanten
V = Volym
T = temperatur i Kelvin
p = tryck
n = antal mol

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13
Q

Energi som krävs för att värma massa

A

Q=m⋅c⋅ΔT

Q = den energi som krävs (i joule eller kilojoule)
m = massan av vattnet (i kg)
c = specifik värmekapacitet (4.18 kJ/kg°C för vatten)
ΔT = temperaturskillnaden (i °C)

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14
Q

Behov av stenkol

A

Behov av stenkol = Energibehov [kJ] / ( Energi innehåll [kJ/kg] * verkningsgrad ) = kg stenkol

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15
Q

Verkningsgrad

A

Verkningsgrad = Arbete som ångmaskin utför [W=J/s] / tillförd värme som ångmaskin producerar [W=J/s]

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