SHR is the sensible heat ratio, calculated as sensible capacity divided by total cooling capacity: SHR = Qs / Qt.

Which inputs are required for the full air-state mode?

Enter T1, W1, T2, W2, and dry-air mass flow. Select the humidity and flow units.

What can I calculate from Qt and Qs?

The Qt and Qs mode calculates SHR and latent capacity Ql, where Ql = Qt − Qs.

What can I calculate from Qt and SHR?

The Qt and SHR mode calculates sensible capacity Qs = SHR × Qt and latent capacity Ql = Qt − Qs.

Can I choose the result precision?

Yes. Set Decimal Places from 0 to 8 places.

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Sensible / Latent Heat Split (SHR = Sensible / Total)

Split an air-conditioning load into sensible and latent components. Total cooling capacity Qt = ṁ_da·(h1 − h2); sensible capacity Qs = ṁ_da·cp_ma·(T1 − T2) with cp_ma ≈ 1.006 + 1.86·W [kJ/(kg da·K)]; latent capacity Ql = Qt − Qs; Sensible Heat Ratio SHR = Qs / Qt. Entering/leaving states are described by dry-bulb temperature T and humidity ratio W; enthalpy h = 1.006·T + W·(2501 + 1.86·T) [kJ/kg da]. Three modes: full air-state split (T1,W1)→(T2,W2), from Qt & Qs (solve SHR + Ql), or from Qt & SHR (solve Qs, Ql).

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2 examples

State split: T1=26, W1=10.5 g/kg -> T2=13, W2=8.8 g/kg, ṁ_da=0.5 kg/s

W1=0.0105, W2=0.0088. h1=1.006·26+0.0105·(2501+1.86·26)=26.156+26.768=52.924. h2=1.006·13+0.0088·(2501+1.86·13)=13.078+22.222=35.300. Qt=0.5·(52.924−35.300)=8.812 kW. cp_ma=1.006+1.86·0.00965=1.0239 (average W). Qs=0.5·1.0239·(26−13)=6.656 kW. Ql=8.812−6.656=2.157 kW. SHR=6.656/8.812=0.755.

{"result":"Heat split (state). ṁ_da=0.5 kg/s. Entering (26 °C, 0.0105 kg/kg) h1=52.92, leaving (13 °C, 0.0088 kg/kg) h2=35.3. Qt=8.81 kW, Qs=6.66 kW, Ql=2.16 kW, SHR=0.755.","metadata":{"input":{"mode":"state","t1":26,"w1":0.0105,"t2":13,"w2":0.0088,"humidityUnit":"g/kg","mda_kg_s":0.5,"flowUnit":"kg/s"},"result":{"mda_kg_s":0.5,"h1":52.92,"h2":35.3,"cp_ma":1.024,"Qt_kW":8.81,"Qs_kW":6.66,"Ql_kW":2.16,"SHR":0.755}}}

From Qt & SHR: Qt=10 kW, SHR=0.75 -> Qs=7.5 kW, Ql=2.5 kW

Qt=10 kW, SHR=0.75. Qs=SHR·Qt=0.75·10=7.5 kW. Ql=Qt−Qs=10−7.5=2.5 kW.

{"result":"Heat split (shr). Qt=10 kW, SHR=0.75 → Qs=7.5 kW, Ql=2.5 kW.","metadata":{"input":{"mode":"shr","qt_kW":10,"shr":0.75},"result":{"Qt_kW":10,"Qs_kW":7.5,"Ql_kW":2.5,"SHR":0.75}}}

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13 options

SettingsAdjust formats, ranges, numbers, and modes.13

ModeselectOptionalFull air-state split, from Qt & Qs, or from Qt & SHR.Entering Dry-bulb T1numberOptionalEntering (return / coil-on) dry-bulb temperature in °C. Used in 'state' mode.Entering Humidity W1numberOptionalEntering humidity ratio W1, in the selected Humidity Unit. Used in 'state' mode.Leaving Dry-bulb T2numberOptionalLeaving (supply / coil-off) dry-bulb temperature in °C. Used in 'state' mode.Leaving Humidity W2numberOptionalLeaving humidity ratio W2, in the selected Humidity Unit. Used in 'state' mode.Humidity UnitselectOptionalDry-air Mass Flow ṁ_danumberOptionalDry-air mass flow rate ṁ_da, in the selected Flow Unit. Used in 'state' mode.Flow UnitselectOptionalTotal Capacity QtnumberOptionalTotal cooling capacity Qt. Enter in the selected Capacity Unit. Used in 'qt' and 'shr' modes.Sensible Capacity QsnumberOptionalSensible cooling capacity Qs. Enter in the selected Capacity Unit. Used in 'qt' mode.Sensible Heat Ratio SHRnumberOptionalSensible Heat Ratio SHR = Qs / Qt (0–1). Used in 'shr' mode.Capacity UnitselectOptionalDecimal PlacesnumberOptional

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Sensible / Latent Heat Split (SHR = Sensible / Total)

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1. Air-conditioning coil heat split from air states

2. Sensible and latent capacity from total capacity and SHR

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