Formule a conoscere Flashcards

1
Q

1 atm

A

101,325 kPa

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2
Q

1kPa

A

1000 N/m^2

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3
Q

Accelerazione gravitΓ 

A

9,81 m/s^2

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4
Q

Lavoro di pulsione / flusso

A

Lv=p/𝜌=pV [kJ]
Lavoro specifico lv=p/𝜌=p
v [kJ/kg]

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5
Q

densitΓ  acqua

A

1000kg/m3=1kg/L

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6
Q

Rendimento Motore termico, Macchina frigorifera e Pompa di Calore

A

Motore termico:
πœ‚π‘‘ =𝐿𝑛,𝑒/𝑄𝑒
πœ‚π’• = 𝟏 βˆ’ 𝑸𝒖/𝑸e

Macchina Frigorifera:
𝐢𝑂𝑃= Qu/Lne
e dal 1Β°PTD β†’ COP=Qi/Qs-Qi

Pompa di calore:
C𝑂𝑃𝑃𝑑𝐢 =𝑸𝒔/Lne=𝑸𝒔/𝑄𝑠 βˆ’ 𝑄𝑖=1/(1 βˆ’π‘„π‘–/𝑄𝑠)

Rapporto pdc e f:
π‘ͺ𝑢𝑷𝑷𝒅π‘ͺ = π‘ͺ𝑢𝑷𝑭 + 𝟏 =1/(𝑄𝑠/(𝑄𝑖 βˆ’ 1))

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7
Q

T (Β°C)

A

T(K) - 273,15

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8
Q

Costante di Boltzman

A

π‘˜ = 1,3086 Γ— 10^βˆ’23 𝐽/𝐾

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9
Q

Caratteristiche Vapore Acqueo

A

Costante gas ideale vapore
Rvap= 461,5 J/(kgΒ·K)

cp= 1,82 KJ/kgΒ·K

ho= 2501,3 kJ/kg

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10
Q

Caratteristiche Aria Secca

A

Costante gas ideale aria secca:
Ra=286,9 J/(kgΒ·K)

cp = 1,005 KJ/kgΒ·K

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11
Q

Gas Perfetti

A

pv=RT

dove
R= Ru/M [kJ/kgK]
RU= 8,31447 [KJ/kmol
K] o [Kpam3/kmolK]
m=M*N

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12
Q

KW

A

kJ / sec

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13
Q

0.10 Mpa

A

100 kPa
100 000 Pa

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