CALSHVAC — Engineering Suite

01 Location

02 Room

03 Envelope

04 Sensible & Latent

05 Results

Location & Climate Data

Auto-loaded from ASHRAE 2021 · CIBSE · Carrier HAP · BMD · Local Standards

Project Name

Client

Consultant / Engineer

Climate Selection

Country *

City *

🌍

—

✏ Override

Outside DB (°F)

Outside WB (°F)

Outside RH (%)

Outside HR (Gr/Lb)

Room DB (°F)

Room WB (°F)

Room RH (%)

Room HR (Gr/Lb)

ΔT DB (°F)

ΔHR (Gr/Lb)

Elevation (ft)

Latitude (°)

Room Parameters & Ventilation

Space Reference / Room Name

Floor

Area (SqFt) *

Ceiling Height (Ft) *

Volume (CuFt)

Room Type

Floor / Level Type

🌬 Fresh Air & Ventilation — ASHRAE 62.1 / EN 15251 / CIBSE Guide A

Space / Occupancy Type *

Number of People (Occupants) *

Room Floor Area (SqFt)

Leave blank to use room area above

Ventilation Design Inputs

Bypass Factor (BF)

Contact Factor (CF)

No. of People

CFM per Person

CFM per SqFt

Air Changes/Hr

Total Vent CFM

Infiltration CFM

Building Envelope

ASHRAE CLTD/CLF Method — Carrier HAP Data

🏗 ASHRAE U-VALUE PRESETS — Select to auto-fill all rows | Edit manually anytime

Glass / Glazing (all directions)

Walls (all 8 directions)

Roof

Floor

Ceiling

Partition

Source: ASHRAE Handbook of Fundamentals 2021 · ASHRAE 90.1-2022 · All values in BTU/hr·ft²·°F

Solar Gain — Glass (BTU/Hr = Area × SHGF × U)

Direction	Area (SqFt)	SHGF / ΔT	U-Value	BTU/Hr
Glass Solar Subtotal				0

Walls & Roof — CLTD Method (BTU/Hr = Area × CLTD × U)

Element	Area (SqFt)	CLTD (°F)	U-Value	BTU/Hr
Wall & Roof Subtotal				0

Transmission — Partition, Floor, Ceiling, Glass

Element	Area (SqFt)	ΔT (°F)	U-Value	BTU/Hr
Other Trans. Subtotal				0

Sensible & Latent Heat — Internal Loads

Dynamic calculation — change any value to update instantly

👤 People Heat Gain ASHRAE Table 1 — Heat Gain from Occupants

No. of People

Activity Level

Sensible (BTU/Hr/person)

Latent (BTU/Hr/person)

Radiant Factor

Sensible: 0 BTU/Hr | Latent: 0 BTU/Hr | Total: 0 BTU/Hr

💡 Lighting Heat Gain ASHRAE Table 2 — Heat Gain from Lights

Floor Area (SqFt)

Lighting Type

W / SqFt

Heat Factor (BTU/W)

Ballast Factor

Space Fraction (CLF)

Radiation Fraction

Convection Fraction

Sensible: 0 BTU/Hr | (Radiant: 0 + Conv: 0)

🔌 Equipment Heat Gain ASHRAE Table 5/6 — Office & Process Equipment

Equipment Name

Watts Each

Quantity

Usage Factor

BTU/Hr

Equipment Name

Watts Each

Quantity

Usage Factor

BTU/Hr

Motor / Power Load (kW)

Equipment Total: 0 BTU/Hr | Motor: 0 BTU/Hr

⚙ Safety & Diversity Factors

Sensible Safety Factor (%)

Latent Safety Factor (%)

Diversity Factor (%)

ADP Selected (°F)

Cooling Load Results

Grand Total Heat

—

Tons of Refrigeration (TR)

Sensible Capacity

—

Supply Air Flow

—

CFM / L/s

Total BTU/Hr

—

BTU/Hr

🌡 Room Sensible Heat

Subtotal: 0 BTU/Hr

Safety Factor: 0 BTU/Hr

Effective RSH: 0 BTU/Hr

💧 Room Latent Heat

Subtotal: 0 BTU/Hr

Safety Factor: 0 BTU/Hr

Effective RLH: 0 BTU/Hr

🌬 Outside Air Heat

OA Sensible0 BTU/Hr

OA Latent0 BTU/Hr

OA Total0 BTU/Hr

Grand Sub-Total0 BTU/Hr

RSHF0

Dehum CFM0 CFM

ADP (°F)—

Dehum Rise (°F)0

✅ Recommended Equipment

Chilled Water Pipe Size Calculation

Formula: GPM = TR × 2.4 (1 TR = 2.4 GPM, fixed) | Carrier Friction Chart | Rule: ≤2" → 4 FPS; >2" → 4 ft/100ft

CWS Temp (°F)

CWR Temp (°F)

ΔT (°F)

System Safety Factor (%)

Pipe Sections — Enter TR load per section

🔗 Refrigerant & Chilled Water Pipe Sizing

VRF Refnet Joint (Independent & Modular) · Chiller Pipe Selection · All sizes in inches

Refnet Type

VRF Brand

System Type

Total IDU Load — Downstream kW

Enter total downstream IDU capacity

Flow Rate (GPM) *

Enter GPM to calculate pipe size

ΔT Chilled Water (°C)

= 10.8 °F | Standard: 5–7 °C

Safety Factor (%)

ASHRAE/BNBC: 10–15%

Pipe Material

Safety Factor (%)

ASHRAE/BNBC: 10–15%

Application	Max (fpm)	Recommended (fpm)	HL (in.wg/100ft)	Noise NC
Supply Main — Low Velocity	1600	700–1200	0.08–0.12	NC 35–40
Supply Main — High Velocity	3000	2000–2500	0.4–0.6	NC 40–50
Supply Branch	1200	500–800	0.06–0.10	NC 30–35
Sub-Branch / Run-out	800	400–600	0.05–0.08	NC 25–30
Return Air Main	1400	600–1000	0.08–0.12	NC 35–40
Return Air Branch	1000	400–700	0.05–0.08	NC 30
Exhaust / Relief	1200	500–800	0.08–0.10	NC 35
Fresh Air / OA Intake	800	400–600	0.05–0.08	NC 25–30
Diffuser Neck	700	300–500	—	NC 25
Fan Inlet	2000	1200–1800	—	Design
Fan Outlet / Discharge	2500	1500–2000	—	Design

Fitting	Equiv. Length (ft)	Loss Coeff ζ	Notes
90° Elbow — Mitered (sharp)	40–60 ft	0.9	Avoid in main ducts
90° Elbow — Radius R/D=1.5	13–23 ft	0.2	Preferred — use turning vanes
45° Elbow — Mitered	16–26 ft	0.35	Better than 90° mitered
Tee — Branch Extract	50–80 ft	0.5–0.9	Wye fittings preferred
Tee — Straight Through	10–20 ft	0.05–0.15	Low loss on main run
Reducer (Concentric, 15° taper)	6–13 ft	0.05	Keep angle ≤ 15°
Expansion (7° taper)	13–26 ft	0.20	Keep angle ≤ 7° for low loss
AHU / Fan Plenum Entry	26–40 ft	0.5	Bell-mouth inlet preferred
Volume Damper (fully open)	10–16 ft	0.1	Increases with partial closure
Grille / Diffuser Neck	16–33 ft	0.3–0.8	Neck velocity dependent
Flexible Duct (per foot)	+1.5× extra	—	Max 5 ft installed length

Location	ΔT	Min. Insulation	Material
Supply — conditioned space	< 15°F	1 in. (25mm)	Glass wool / mineral wool
Supply — unconditioned space	15–35°F	2 in. (50mm)	Foil-faced glass wool
Supply — outdoor / rooftop	> 35°F	3 in. (75mm)	PIR / PU foam board
Return — conditioned	< 15°F	1 in. (25mm)	Glass wool
Return — unconditioned	15–25°F	1.5 in. (38mm)	Glass wool
Exhaust duct	Any	None (< 10ft)	—
Fresh air intake	> 25°F	2 in. (50mm)	Vapour barrier essential

📁 Saved Projects

Location & Climate Data

Room Parameters & Ventilation

Building Envelope

Sensible & Latent Heat — Internal Loads

Cooling Load Results

🌡 Room Sensible Heat

💧 Room Latent Heat

✅ Recommended Equipment

Chilled Water Pipe Size Calculation

🔗 Refrigerant & Chilled Water Pipe Sizing

💧 Pump Head Calculation

🏭 Cooling Tower — Make-Up Water Calculation

🌬 Duct Sizing Calculator

📋 Bill of Quantities (BOQ)

📁 Saved Projects