Head Static.docx

Design Parameter Formula Head Static : P

= Pressure (psi)

W

= Density of Water (pound/ft³) = Water Density 1000 kg/m³ = Water Density 62.298 pound/ft³

h

= Static Head (feet) w p= 𝑥ℎ 144 p=

62.298 pound/ft³ 𝑥1 144

p = 0.433 psi

Conversion

:

1 psi

= 0.069 bar

1 bar

= 14.5 psi

Example

: p=

w 𝑥ℎ 144

p=

62.298 pound/ft³ 𝑥 98.4 144

p = 42.57 psi p = 2.937 bar

Cooling Load Fluid Design : m

= Mass flow rate of fluid (kg/s)

Cp

= Specific heat capacity (kJ/(Kg*K))

ΔT

= Temperature Difference (°C)

p

= mass Density (kg/m³)

V

= Volume flow rate (m³/s)

Q

= Load Capacity (k j/s) (kW) 𝑚=𝑝𝑥𝑉 𝑄 = 𝑚 𝑥 𝐶𝑝 𝑥 𝛥𝑇 𝑄 = 𝑝 𝑥 𝑉 𝑥 𝐶𝑝 𝑥 𝛥𝑇

Design Parameter Conversion

:

1 k j/s

= 1 kW

1 kW

= 0.2844 TR

1 TR

= 3.52 kW

Example

:

V

= 360 m³/h (0.1 m³/s)

p

= 1000 kg/m³

Cp

= 4.2 (kJ/(Kg*K))

ΔT

= 5 °C / Entering 12°C / Leaving 7°C 𝑄 = 𝑝 𝑥 𝑉 𝑥 𝐶𝑝 𝑥 𝛥𝑇 𝑄 = 1000 𝑘𝑔/𝑚³ 𝑥 0.1 𝑚³/ℎ 𝑥 4.2 𝑘𝐽/(𝐾𝑔 ∗ 𝐾) 𝑥 5 °𝐶 𝑄 = 1000 𝑘𝑔/𝑚³ 𝑥 0.1 𝑚³/𝑠 𝑥 4.2 𝑘𝐽/(𝐾𝑔 ∗ 𝐾) 𝑥 5 °𝐶 𝑄 = 2100 𝑘𝑗/𝑠 𝑄 = 2100 𝑘𝑤 𝑄 = 597 𝑇𝑅

Cooling Load Heat Transfer Design

:

ΔT

= Temperature Difference (°C)

A

= Heat Transfer Area (m²)

U

= Overall heat transfer coefficient (W/(m²*K)

q

= Heat Transfer (W)