Quiz 4 resubmission of air handling unit, Cheat Sheet of Refrigeration and Air Conditioning

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Marriot North Wing Hotel-Level 9

(Grand Corridor, Lift Lobbies)

ME150-2/C

Quiz 4

Rabang, Jan Marcel, C.

ME150-2/C

Engr. Renato Afurong

Instructor

January 14, 2023

TABLE OF CONTENTS

• Title Page
• Table of Contents
• Statement of the Problem
• Requirements
• Orientation
• Schematic Diagram of air ducts showing length of Duct and CFM per branch
• Selection of duct velocity and initial computation
• Tabulation of air duct design sizes
• Longest Run
• Total external static pressure
• Diffuser velocity selection and initial computation of diffuser sizes
• Tabulation of quantity of diffuser sizes, velocity & CFM
• Schematic diagram of air ducts showing sizes of ducts and sizes of diffuser with CFM rating

Requirements:

A. Air conditioning Load Estimate

1 Student Report

1. Heat Load per floor and per room
2. Psychrometric Charts per for the whole floor
3. Whole floor figure

B. Supply air duct design using equal friction method

1. Schematic diagram of air ducts showing length of duct and CFM per branch.
2. Selection of duct velocity and initial computation
3. Tabulation of air duct design sizes
4. Longest Run
5. Total external static pressure
6. Diffuser velocity selection and initial computation of diffuser sizes
7. Tabulation of quantity of diffuser sizes, velocity & CFM
8. Schematic diagram of air ducts showing sizes of ducts and sizes of diffuser with CFM rating

C. Equipment Selection

1. Packaged Chiller

a. Estimated capacity of chiller (water cooled)

b. Chiller Data Selected

c. Chilled and cooling water flow in gpm

d. Schematic diagram showing the chiller, cooling towe, cooling &chilled water pumps,

flow rate in gpm, entering/leaving temperatures and pressure drops on the chiller &

condenser.

e. High-lighted selected data on the brochure

f. Specification of the chiller

2. Air Handling Unit

a. AHU Tabulated Data

b. AHU Data Selected

c. Chilled and cooling water flow in gpm

d. Schematic diagram of AHUs

e. Highlighted selected data of the brochure

f. Specification of AHUs

D. Economics- Comparison of Air-cooled & Water-cooled chiller

Orientation:

76 FDB 50% RH

96 FDB 80 FWB

N

W

S

E

A

2966.16 cfm

525.36 cfm

700.476 cfm

1105.75 cfm

1686.14 cfm

2266.53 cfm

2966.16 cfm

2. Selection of duct velocity and initial computation

Total cfm = 2966.16 cfm

ଶ

Selected duct size = 18 in * 18 in

Equivalent round duct diameter = 19.7 in

0.15 in W.G/100 ft. length of duct

2966.16 cfm

1500 fpm

3. Tabulation of air duct design sizes

DUCT

SECTION

AIR

QUANTITY

(CFM)

CFM

CAPACITY (%)

DUCT AREA

AREA (sq. ft.) DUCT SIZE

(in.)

AHU to A 2966.16 100 100 1.98 18 x 18

A- 2 2266.53 76 81 1.6038 18 x 14

2 - 3 1686.14 57 65 1.28 14 x 14

3 - 4 1105.75 37 45 0.891 12 x 12

A- 1 700.476 24 31.5 0.6237 10 x 10

4 - 5 525.36 18 25 0.495 10 x 8

4. Longest Run

Duct Section Item Length (ft) Additional Equivalent Length (ft)

AHU – A Duct 6.5 6

--- Elbow 13

A- 2 Duct 61.

2 - 3 Duct 61.

3 - 4 Duct 61.

4 - 5 Duct 28.

--- Elbow 6

Total 218. 49 19

Longest Run Air Distribution

(LRAD)

A

5. Total external static Pressure

6. Diffuser Velocity Selection and initial computation of diffuser sizes

Computation for Diffuser Sizes:

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