थर्मोडायनामिक समीकरणों की तालिका
For इन समीकरणों में प्रयुक्त गणित अंकन की सूची, see
गणितीय अंकन .
यह लेख ऊष्मप्रवैगिकी में सामान्य समीकरण और भौतिक मात्रा का सारांश है (अधिक विस्तार के लिए ऊष्मप्रवैगिकी समीकरण देखें)।
परिभाषाएँ
नीचे दी गई कई परिभाषाएँ रासायनिक प्रतिक्रिया ओं के ऊष्मप्रवैगिकी में भी उपयोग की जाती हैं।
सामान्य मूल मात्रा
मात्रा (सामान्य नाम)
(सामान्य) प्रतीक
एसआई इकाइयां
आयाम
अणुओं की संख्या
N
विमाहीन
विमाहीन
मोल्स की संख्या
n
mol
[N]
तापमान
T
K
[Θ]
ऊष्मा ऊर्जा
Q, q
J
[M][L]2 [T]−2
गुप्त ऊष्मा
QL
J
[M][L]2 [T]−2
सामान्य व्युत्पन्न मात्रा
Quantity (Common Name/s)
(Common) Symbol/s
Defining Equation
SI Units
Dimension
Thermodynamic beta , Inverse temperature
β
β = 1 / k B T {\displaystyle \beta =1/k_{B}T\,\!}
J−1
[T]2 [M]−1 [L]−2
Thermodynamic temperature
τ
τ = k B T {\displaystyle \tau =k_{B}T\,\!}
τ = k B ( ∂ U / ∂ S ) N {\displaystyle \tau =k_{B}\left(\partial U/\partial S\right)_{N}\,\!}
1 / τ = 1 / k B ( ∂ S / ∂ U ) N {\displaystyle 1/\tau =1/k_{B}\left(\partial S/\partial U\right)_{N}\,\!}
J
[M] [L]2 [T]−2
Entropy
S
S = − k B ∑ i p i ln p i {\displaystyle S=-k_{B}\sum _{i}p_{i}\ln p_{i}}
S = − ( ∂ F / ∂ T ) V {\displaystyle S=-\left(\partial F/\partial T\right)_{V}\,\!} ,
S = − ( ∂ G / ∂ T ) N , P {\displaystyle S=-\left(\partial G/\partial T\right)_{N,P}\,\!}
J K−1
[M][L]2 [T]−2 [Θ]−1
Pressure
P
P = − ( ∂ F / ∂ V ) T , N {\displaystyle P=-\left(\partial F/\partial V\right)_{T,N}\,\!}
P = − ( ∂ U / ∂ V ) S , N {\displaystyle P=-\left(\partial U/\partial V\right)_{S,N}\,\!}
Pa
M L−1 T−2
Internal Energy
U
U = ∑ i E i {\displaystyle U=\sum _{i}E_{i}\!}
J
[M][L]2 [T]−2
Enthalpy
H
H = U + p V {\displaystyle H=U+pV\,\!}
J
[M][L]2 [T]−2
Partition Function
Z
dimensionless
dimensionless
Gibbs free energy
G
G = H − T S {\displaystyle G=H-TS\,\!}
J
[M][L]2 [T]−2
Chemical potential (of
component i in a mixture)
μi
μ i = ( ∂ U / ∂ N i ) N j ≠ i , S , V {\displaystyle \mu _{i}=\left(\partial U/\partial N_{i}\right)_{N_{j\neq i},S,V}\,\!}
μ i = ( ∂ F / ∂ N i ) T , V {\displaystyle \mu _{i}=\left(\partial F/\partial N_{i}\right)_{T,V}\,\!} , where F is not proportional to N because μi depends on pressure.
μ i = ( ∂ G / ∂ N i ) T , P {\displaystyle \mu _{i}=\left(\partial G/\partial N_{i}\right)_{T,P}\,\!} , where G is proportional to N (as long as the molar ratio composition of the system remains the same) because μi depends only on temperature and pressure and composition.
μ i / τ = − 1 / k B ( ∂ S / ∂ N i ) U , V {\displaystyle \mu _{i}/\tau =-1/k_{B}\left(\partial S/\partial N_{i}\right)_{U,V}\,\!}
J
[M][L]2 [T]−2
Helmholtz free energy
A, F
F = U − T S {\displaystyle F=U-TS\,\!}
J
[M][L]2 [T]−2
Landau potential , Landau Free Energy, Grand potential
Ω , ΦG
Ω = U − T S − μ N {\displaystyle \Omega =U-TS-\mu N\,\!}
J
[M][L]2 [T]−2
Massieu Potential, Helmholtz free entropy
Φ
Φ = S − U / T {\displaystyle \Phi =S-U/T\,\!}
J K−1
[M][L]2 [T]−2 [Θ]−1
Planck potential, Gibbs free entropy
Ξ
Ξ = Φ − p V / T {\displaystyle \Xi =\Phi -pV/T\,\!}
J K−1
[M][L]2 [T]−2 [Θ]−1
पदार्थ के ऊष्मीय गुण
Quantity (common name/s)
(Common) symbol/s
Defining equation
SI units
Dimension
General heat/thermal capacity
C
C = ∂ Q / ∂ T {\displaystyle C=\partial Q/\partial T\,\!}
J K −1
[M][L]2 [T]−2 [Θ]−1
Heat capacity (isobaric)
Cp
C p = ∂ H / ∂ T {\displaystyle C_{p}=\partial H/\partial T\,\!}
J K −1
[M][L]2 [T]−2 [Θ]−1
Specific heat capacity (isobaric)
Cmp
C m p = ∂ 2 Q / ∂ m ∂ T {\displaystyle C_{mp}=\partial ^{2}Q/\partial m\partial T\,\!}
J kg−1 K−1
[L]2 [T]−2 [Θ]−1
Molar specific heat capacity (isobaric)
Cnp
C n p = ∂ 2 Q / ∂ n ∂ T {\displaystyle C_{np}=\partial ^{2}Q/\partial n\partial T\,\!}
J K −1 mol−1
[M][L]2 [T]−2 [Θ]−1 [N]−1
Heat capacity (isochoric/volumetric)
CV
C V = ∂ U / ∂ T {\displaystyle C_{V}=\partial U/\partial T\,\!}
J K −1
[M][L]2 [T]−2 [Θ]−1
Specific heat capacity (isochoric)
CmV
C m V = ∂ 2 Q / ∂ m ∂ T {\displaystyle C_{mV}=\partial ^{2}Q/\partial m\partial T\,\!}
J kg−1 K−1
[L]2 [T]−2 [Θ]−1
Molar specific heat capacity (isochoric)
CnV
C n V = ∂ 2 Q / ∂ n ∂ T {\displaystyle C_{nV}=\partial ^{2}Q/\partial n\partial T\,\!}
J K −1 mol−1
[M][L]2 [T]−2 [Θ]−1 [N]−1
Specific latent heat
L
L = ∂ Q / ∂ m {\displaystyle L=\partial Q/\partial m\,\!}
J kg−1
[L]2 [T]−2
Ratio of isobaric to isochoric heat capacity, heat capacity ratio , adiabatic index
γ
γ = C p / C V = c p / c V = C m p / C m V {\displaystyle \gamma =C_{p}/C_{V}=c_{p}/c_{V}=C_{mp}/C_{mV}\,\!}
dimensionless
dimensionless
थर्मल ट्रांसफर
Quantity (common name/s)
(Common) symbol/s
Defining equation
SI units
Dimension
Temperature gradient
No standard symbol
∇ T {\displaystyle \nabla T\,\!}
K m−1
[Θ][L]−1
Thermal conduction rate, thermal current, thermal/heat flux , thermal power transfer
P
P = d Q / d t {\displaystyle P=\mathrm {d} Q/\mathrm {d} t\,\!}
W = J s−1
[M] [L]2 [T]−3
Thermal intensity
I
I = d P / d A {\displaystyle I=\mathrm {d} P/\mathrm {d} A}
W m−2
[M] [T]−3
Thermal/heat flux density (vector analogue of thermal intensity above)
q
Q = ∬ q ⋅ d S d t {\displaystyle Q=\iint \mathbf {q} \cdot \mathrm {d} \mathbf {S} \mathrm {d} t\,\!}
W m−2
[M] [T]−3
समीकरण
इस लेख के समीकरणों को विषय द्वारा वर्गीकृत किया गया है।
ऊष्मागतिक प्रक्रियाएं
Physical situation
Equations
Isentropic process (adiabatic and reversible)
Q = 0 , Δ U = − W {\displaystyle Q=0,\quad \Delta U=-W\,\!}
For an ideal gas
p 1 V 1 γ = p 2 V 2 γ {\displaystyle p_{1}V_{1}^{\gamma }=p_{2}V_{2}^{\gamma }\,\!}
T 1 V 1 γ − 1 = T 2 V 2 γ − 1 {\displaystyle T_{1}V_{1}^{\gamma -1}=T_{2}V_{2}^{\gamma -1}\,\!}
p 1 1 − γ T 1 γ = p 2 1 − γ T 2 γ {\displaystyle p_{1}^{1-\gamma }T_{1}^{\gamma }=p_{2}^{1-\gamma }T_{2}^{\gamma }\,\!}
Isothermal process
Δ U = 0 , W = Q {\displaystyle \Delta U=0,\quad W=Q\,\!}
For an ideal gas
W = k T N ln ( V 2 / V 1 ) {\displaystyle W=kTN\ln(V_{2}/V_{1})\,\!}
W = n R T ln ( V 2 / V 1 ) {\displaystyle W=nRT\ln(V_{2}/V_{1})\,\!}
Isobaric process
p 1 = p 2 , p = constant
W = p Δ V , Q = Δ U + p δ V {\displaystyle W=p\Delta V,\quad Q=\Delta U+p\delta V\,\!}
Isochoric process
V 1 = V 2 , V = constant
W = 0 , Q = Δ U {\displaystyle W=0,\quad Q=\Delta U\,\!}
Free expansion
Δ U = 0 {\displaystyle \Delta U=0\,\!}
Work done by an expanding gas
Process
W = ∫ V 1 V 2 p d V {\displaystyle W=\int _{V_{1}}^{V_{2}}p\mathrm {d} V\,\!}
Net Work Done in Cyclic Processes
W = ∮ c y c l e p d V = ∮ c y c l e Δ Q {\displaystyle W=\oint _{\mathrm {cycle} }p\mathrm {d} V=\oint _{\mathrm {cycle} }\Delta Q\,\!}
गतिज सिद्धांत
आदर्श गैस
एंट्रॉपी
S = k B ln Ω {\displaystyle S=k_{\mathrm {B} }\ln \Omega } , जहां k B बोल्ट्ज़मैन स्थिरांक है, और Ω चरण स्थान में स्थूल अवस्था की मात्रा को दर्शाता है या अन्यथा ऊष्मागतिक संभाव्यता कहा जाता है।
d S = δ Q T {\displaystyle dS={\frac {\delta Q}{T}}} , केवल प्रतिवर्ती प्रक्रियाओं के लिए
सांख्यिकीय भौतिकी
नीचे एक आदर्श गैस के लिए मैक्सवेल-बोल्ट्ज़मैन वितरण से उपयोगी परिणाम और एंट्रॉपी मात्रा के निहितार्थ हैं। वितरण आदर्श गैस बनाने वाले परमाणुओं या अणुओं के लिए मान्य है।
Physical situation
Nomenclature
Equations
Maxwell–Boltzmann distribution
v = velocity of atom/molecule,
m = mass of each molecule (all molecules are identical in kinetic theory),
γ (p ) = Lorentz factor as function of momentum (see below)
Ratio of thermal to rest mass-energy of each molecule:θ = k B T / m c 2 {\displaystyle \theta =k_{B}T/mc^{2}\,\!}
K 2 is the Modified Bessel function of the second kind.
Non-relativistic speeds
P ( v ) = 4 π ( m 2 π k B T ) 3 / 2 v 2 e − m v 2 / 2 k B T {\displaystyle P\left(v\right)=4\pi \left({\frac {m}{2\pi k_{B}T}}\right)^{3/2}v^{2}e^{-mv^{2}/2k_{B}T}\,\!}
Relativistic speeds (Maxwell-Jüttner distribution)
f ( p ) = 1 4 π m 3 c 3 θ K 2 ( 1 / θ ) e − γ ( p ) / θ {\displaystyle f(p)={\frac {1}{4\pi m^{3}c^{3}\theta K_{2}(1/\theta )}}e^{-\gamma (p)/\theta }}
Entropy Logarithm of the density of states
Pi = probability of system in microstate i
Ω = total number of microstates
S = − k B ∑ i P i ln P i = k B ln Ω {\displaystyle S=-k_{B}\sum _{i}P_{i}\ln P_{i}=k_{\mathrm {B} }\ln \Omega \,\!}
where:
P i = 1 / Ω {\displaystyle P_{i}=1/\Omega \,\!}
Entropy change
Δ S = ∫ Q 1 Q 2 d Q T {\displaystyle \Delta S=\int _{Q_{1}}^{Q_{2}}{\frac {\mathrm {d} Q}{T}}\,\!}
Δ S = k B N ln V 2 V 1 + N C V ln T 2 T 1 {\displaystyle \Delta S=k_{B}N\ln {\frac {V_{2}}{V_{1}}}+NC_{V}\ln {\frac {T_{2}}{T_{1}}}\,\!}
Entropic force
F S = − T ∇ S {\displaystyle \mathbf {F} _{\mathrm {S} }=-T\nabla S\,\!}
Equipartition theorem
df = degree of freedom
Average kinetic energy per degree of freedom
⟨ E k ⟩ = 1 2 k T {\displaystyle \langle E_{\mathrm {k} }\rangle ={\frac {1}{2}}kT\,\!}
Internal energy
U = d f ⟨ E k ⟩ = d f 2 k T {\displaystyle U=d_{f}\langle E_{\mathrm {k} }\rangle ={\frac {d_{f}}{2}}kT\,\!}
गैर-सापेक्षवादी मैक्सवेल-बोल्ट्जमान वितरण के परिणाम नीचे दिए गए हैं।
Physical situation
Nomenclature
Equations
Mean speed
⟨ v ⟩ = 8 k B T π m {\displaystyle \langle v\rangle ={\sqrt {\frac {8k_{B}T}{\pi m}}}\,\!}
Root mean square speed
v r m s = ⟨ v 2 ⟩ = 3 k B T m {\displaystyle v_{\mathrm {rms} }={\sqrt {\langle v^{2}\rangle }}={\sqrt {\frac {3k_{B}T}{m}}}\,\!}
Modal speed
v m o d e = 2 k B T m {\displaystyle v_{\mathrm {mode} }={\sqrt {\frac {2k_{B}T}{m}}}\,\!}
Mean free path
σ = Effective cross-section
n = Volume density of number of target particles
ℓ = Mean free path
ℓ = 1 / 2 n σ {\displaystyle \ell =1/{\sqrt {2}}n\sigma \,\!}
अर्ध-स्थैतिक और प्रतिवर्ती प्रक्रियाएं
अर्ध-स्थैतिक प्रक्रिया | अर्ध-स्थैतिक और प्रतिवर्ती प्रक्रिया (ऊष्मागतिक्स) प्रक्रियाओं के लिए, ऊष्मप्रवैगिकी का पहला नियम है:
d U = δ Q − δ W {\displaystyle dU=\delta Q-\delta W}
जहाँ δQ तंत्र को आपूर्ति की गई ऊष्मा है और δW निकाय द्वारा किया गया कार्य है।
ऊष्मागतिक क्षमता
निम्नलिखित ऊर्जाओं को ऊष्मागतिक क्षमता कहा जाता है,
Name
Symbol
Formula
Natural variables
Internal energy
U {\displaystyle U}
∫ ( T d S − p d V + ∑ i μ i d N i ) {\displaystyle \int \left(T\,\mathrm {d} S-p\,\mathrm {d} V+\sum _{i}\mu _{i}\mathrm {d} N_{i}\right)}
S , V , { N i } {\displaystyle S,V,\{N_{i}\}}
Helmholtz free energy
F {\displaystyle F}
U − T S {\displaystyle U-TS}
T , V , { N i } {\displaystyle T,V,\{N_{i}\}}
Enthalpy
H {\displaystyle H}
U + p V {\displaystyle U+pV}
S , p , { N i } {\displaystyle S,p,\{N_{i}\}}
Gibbs free energy
G {\displaystyle G}
U + p V − T S {\displaystyle U+pV-TS}
T , p , { N i } {\displaystyle T,p,\{N_{i}\}}
Landau potential, or grand potential
Ω {\displaystyle \Omega } , Φ G {\displaystyle \Phi _{\text{G}}}
U − T S − {\displaystyle U-TS-} ∑ i {\displaystyle \sum _{i}\,} μ i N i {\displaystyle \mu _{i}N_{i}}
T , V , { μ i } {\displaystyle T,V,\{\mu _{i}\}}
और संबंधित मूलभूत ऊष्मागतिक संबंध या मास्टर समीकरण[2] हैं:
Potential
Differential
Internal energy
d U ( S , V , N i ) = T d S − p d V + ∑ i μ i d N i {\displaystyle dU\left(S,V,{N_{i}}\right)=TdS-pdV+\sum _{i}\mu _{i}dN_{i}}
Enthalpy
d H ( S , p , N i ) = T d S + V d p + ∑ i μ i d N i {\displaystyle dH\left(S,p,{N_{i}}\right)=TdS+Vdp+\sum _{i}\mu _{i}dN_{i}}
Helmholtz free energy
d F ( T , V , N i ) = − S d T − p d V + ∑ i μ i d N i {\displaystyle dF\left(T,V,{N_{i}}\right)=-SdT-pdV+\sum _{i}\mu _{i}dN_{i}}
Gibbs free energy
d G ( T , p , N i ) = − S d T + V d p + ∑ i μ i d N i {\displaystyle dG\left(T,p,{N_{i}}\right)=-SdT+Vdp+\sum _{i}\mu _{i}dN_{i}}
मैक्सवेल के संबंध
मैक्सवेल के चार सबसे आम संबंध हैं:
Physical situation
Nomenclature
Equations
Thermodynamic potentials as functions of their natural variables
U ( S , V ) {\displaystyle U(S,V)\,} = Internal energy
H ( S , P ) {\displaystyle H(S,P)\,} = Enthalpy
F ( T , V ) {\displaystyle F(T,V)\,} = Helmholtz free energy
G ( T , P ) {\displaystyle G(T,P)\,} = Gibbs free energy
( ∂ T ∂ V ) S = − ( ∂ P ∂ S ) V = ∂ 2 U ∂ S ∂ V {\displaystyle \left({\frac {\partial T}{\partial V}}\right)_{S}=-\left({\frac {\partial P}{\partial S}}\right)_{V}={\frac {\partial ^{2}U}{\partial S\partial V}}}
( ∂ T ∂ P ) S = + ( ∂ V ∂ S ) P = ∂ 2 H ∂ S ∂ P {\displaystyle \left({\frac {\partial T}{\partial P}}\right)_{S}=+\left({\frac {\partial V}{\partial S}}\right)_{P}={\frac {\partial ^{2}H}{\partial S\partial P}}}
+ ( ∂ S ∂ V ) T = ( ∂ P ∂ T ) V = − ∂ 2 F ∂ T ∂ V {\displaystyle +\left({\frac {\partial S}{\partial V}}\right)_{T}=\left({\frac {\partial P}{\partial T}}\right)_{V}=-{\frac {\partial ^{2}F}{\partial T\partial V}}}
− ( ∂ S ∂ P ) T = ( ∂ V ∂ T ) P = ∂ 2 G ∂ T ∂ P {\displaystyle -\left({\frac {\partial S}{\partial P}}\right)_{T}=\left({\frac {\partial V}{\partial T}}\right)_{P}={\frac {\partial ^{2}G}{\partial T\partial P}}}
अधिक संबंधों में निम्नलिखित शामिल हैं।
( ∂ S ∂ U ) V , N = 1 T {\displaystyle \left({\partial S \over \partial U}\right)_{V,N}={1 \over T}}
( ∂ S ∂ V ) N , U = p T {\displaystyle \left({\partial S \over \partial V}\right)_{N,U}={p \over T}}
( ∂ S ∂ N ) V , U = − μ T {\displaystyle \left({\partial S \over \partial N}\right)_{V,U}=-{\mu \over T}}
( ∂ T ∂ S ) V = T C V {\displaystyle \left({\partial T \over \partial S}\right)_{V}={T \over C_{V}}}
( ∂ T ∂ S ) P = T C P {\displaystyle \left({\partial T \over \partial S}\right)_{P}={T \over C_{P}}}
− ( ∂ p ∂ V ) T = 1 V K T {\displaystyle -\left({\partial p \over \partial V}\right)_{T}={1 \over {VK_{T}}}}
अन्य अंतर समीकरण हैं:
Name
H
U
G
Gibbs–Helmholtz equation
H = − T 2 ( ∂ ( G / T ) ∂ T ) p {\displaystyle H=-T^{2}\left({\frac {\partial \left(G/T\right)}{\partial T}}\right)_{p}}
U = − T 2 ( ∂ ( F / T ) ∂ T ) V {\displaystyle U=-T^{2}\left({\frac {\partial \left(F/T\right)}{\partial T}}\right)_{V}}
G = − V 2 ( ∂ ( F / V ) ∂ V ) T {\displaystyle G=-V^{2}\left({\frac {\partial \left(F/V\right)}{\partial V}}\right)_{T}}
( ∂ H ∂ p ) T = V − T ( ∂ V ∂ T ) P {\displaystyle \left({\frac {\partial H}{\partial p}}\right)_{T}=V-T\left({\frac {\partial V}{\partial T}}\right)_{P}}
( ∂ U ∂ V ) T = T ( ∂ P ∂ T ) V − P {\displaystyle \left({\frac {\partial U}{\partial V}}\right)_{T}=T\left({\frac {\partial P}{\partial T}}\right)_{V}-P}
क्वांटम गुण
U = N k B T 2 ( ∂ ln Z ∂ T ) V {\displaystyle U=Nk_{B}T^{2}\left({\frac {\partial \ln Z}{\partial T}}\right)_{V}~}
S = U T + N k B ln Z − N k ln N + N k {\displaystyle S={\frac {U}{T}}+Nk_{B}\ln Z-Nk\ln N+Nk~} अप्रभेद्य कण
जहाँ N कणों की संख्या है, h प्लैंक नियतांक है, I जड़त्वाघूर्ण है, और Z विभिन्न रूपों में विभाजन फलन (सांख्यिकीय यांत्रिकी) है:
Degree of freedom
Partition function
Translation
Z t = ( 2 π m k B T ) 3 2 V h 3 {\displaystyle Z_{t}={\frac {(2\pi mk_{B}T)^{\frac {3}{2}}V}{h^{3}}}}
Vibration
Z v = 1 1 − e − h ω 2 π k B T {\displaystyle Z_{v}={\frac {1}{1-e^{\frac {-h\omega }{2\pi k_{B}T}}}}}
Rotation
Z r = 2 I k B T σ ( h 2 π ) 2 {\displaystyle Z_{r}={\frac {2Ik_{B}T}{\sigma ({\frac {h}{2\pi }})^{2}}}}
पदार्थ के ऊष्मीय गुण
Coefficients
Equation
Joule-Thomson coefficient
μ J T = ( ∂ T ∂ p ) H {\displaystyle \mu _{JT}=\left({\frac {\partial T}{\partial p}}\right)_{H}}
Compressibility (constant temperature)
K T = − 1 V ( ∂ V ∂ p ) T , N {\displaystyle K_{T}=-{1 \over V}\left({\partial V \over \partial p}\right)_{T,N}}
Coefficient of thermal expansion (constant pressure)
α p = 1 V ( ∂ V ∂ T ) p {\displaystyle \alpha _{p}={\frac {1}{V}}\left({\frac {\partial V}{\partial T}}\right)_{p}}
Heat capacity (constant pressure)
C p = ( ∂ Q r e v ∂ T ) p = ( ∂ U ∂ T ) p + p ( ∂ V ∂ T ) p = ( ∂ H ∂ T ) p = T ( ∂ S ∂ T ) p {\displaystyle C_{p}=\left({\partial Q_{rev} \over \partial T}\right)_{p}=\left({\partial U \over \partial T}\right)_{p}+p\left({\partial V \over \partial T}\right)_{p}=\left({\partial H \over \partial T}\right)_{p}=T\left({\partial S \over \partial T}\right)_{p}}
Heat capacity (constant volume)
C V = ( ∂ Q r e v ∂ T ) V = ( ∂ U ∂ T ) V = T ( ∂ S ∂ T ) V {\displaystyle C_{V}=\left({\partial Q_{rev} \over \partial T}\right)_{V}=\left({\partial U \over \partial T}\right)_{V}=T\left({\partial S \over \partial T}\right)_{V}}
तापीय स्थानांतरण
तापीय क्षमता
Physical situation
Nomenclature
Equations
Thermodynamic engines
η = efficiency
W = work done by engine
QH = heat energy in higher temperature reservoir
QL = heat energy in lower temperature reservoir
TH = temperature of higher temp. reservoir
TL = temperature of lower temp. reservoir
Thermodynamic engine:
η = | W Q H | {\displaystyle \eta =\left|{\frac {W}{Q_{H}}}\right|\,\!}
Carnot engine efficiency:
η c = 1 − | Q L Q H | = 1 − T L T H {\displaystyle \eta _{c}=1-\left|{\frac {Q_{L}}{Q_{H}}}\right|=1-{\frac {T_{L}}{T_{H}}}\,\!}
Refrigeration
K = coefficient of refrigeration performance
Refrigeration performance
K = | Q L W | {\displaystyle K=\left|{\frac {Q_{L}}{W}}\right|\,\!}
Carnot refrigeration performance
K C = | Q L | | Q H | − | Q L | = T L T H − T L {\displaystyle K_{C}={\frac {|Q_{L}|}{|Q_{H}|-|Q_{L}|}}={\frac {T_{L}}{T_{H}-T_{L}}}\,\!}
यह भी देखें
संदर्भ
↑ Keenan, Thermodynamics , Wiley, New York, 1947
↑ Physical chemistry, P.W. Atkins, Oxford University Press, 1978, ISBN 0 19 855148 7
Atkins, Peter and de Paula, Julio Physical Chemistry , 7th edition, W.H. Freeman and Company, 2002 ISBN 0-7167-3539-3 .
Chapters 1–10, Part 1: "Equilibrium".
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