This document provides information about HVAC systems, including definitions, applications in factories, how different HVAC components work, reasons for their use, potential hazards and accidents, energy savings opportunities, efficiency calculations, preventative maintenance, and checklists. It defines HVAC, lists common factory HVAC components, explains how AC, AHU, chillers, and cooling towers function. It outlines hazards from lack of maintenance and lists preventative actions. Checklists are provided for daily inspection of AC, AHU, chillers, cooling towers, and evaporative cooling fans. Efficiency is also discussed through the energy efficiency ratio calculation.

1. Knowledge share about AC, Chiller,
AHU and others operation and safety
Trainer: Engr. Md. Zakirul Islam
Assistant Chief Engineer

2. Lesson about HVAC
1. HVAC definition
2. Factory Application
3. How it is work
4. Reason for use
5. Hazard/Accident cause
6. Energy savings scope
7. Efficiency calculation
8. Preventive action

3. What is HVAC?
H-Heating
V-Ventilation
AC-Air conditioning
Definition

4. Several types of items we have using in factory likes
1. AHU (Air handling unit)
2. Chiller
3. AC
4. Cooling tower
5. Panel AC
6. Fridge
7. Evaporative cooling fan (ECF)
8. Cooling conveyor
9. Water dispenser
10. Compressor dryer
Factory Application

5. How AC work?

6. How AHU work?

7. How Chiller work?

8. How cooling tower work?

9. How Evaporative cooling fan work?

10. How fridge work?

11. Why need HVAC?
# Comfort work zone
# Finished product quality maintain
# Machine smooth operation
# Electric/Electronics device protection from high temperature
# Raw materials quality maintain
Reason for use

12. There are so many causes for accident by HVAC system
1. Lack of preventive maintenance/check.
2. Lack of applicable area isolation/insulation.
3. Electric loose connection/over current.
4. Filter not clean with regular basis.
5. Compressor continue running with full load.
6. Refrigerant gas line leakage.
7. Refrigerant gas high pressure increase.
8. Flammable items keep beside AC
9. AC outdoor protect from sunlight and confined space.
Hazard/Accident cause

13. Some pictures after AC blast

14. We have huge energy savings scope from HVAC.
1. All mezzanine floor office/production floor need carpeting for protect
heat loss.
2. All metal beam/column need insulation inside AC room.
3. Proper AC selection consider area and machines.
4. Frequently filter cleaning.
5. All possible gape minimize from AC room/AC system.
6. If not need AC system will be shutdown.
Energy savings scope

15. EER (Energy Efficiency Ratio)
EER rating calculation = 12,000 BTU / 1000 W = 12
EER rating of 12 tells us that for every 1W of energy we provide to the air conditioner,
the air conditioner will give us 12 BTU of cooling effect.
That’s much better than, let’s say, a 12,000 BTU 1,400W air conditioner. EER rating, in
this case, would be 12,000BTU/1,400W = 8.57. That means that for every 1W of
energy, this AC would provide us with only 8.57 BTU of cooling effect instead of 12
BTU. In turn, this makes the EER 12 unit 40% more energy-efficient than EER 8.57
unit.
The average EER rating of portable AC units is about 8.5. That means buying ones
below EER 8.5 is not advisable and buying those above 8.5 is quite a smart move
efficiency-wise.
Efficiency calculation

16. EER graph

17. 1. Cooling tower chemicals need to ensure for better service.
2. Need to ensure nylon brush use during condenser tube cleaning.
3. Need to ensure chemical use with RO water for chiller (If
possible).
4. Need more careful during fins cleaning.
5. Damaged insulation need to replace.
6. We need more focus on others HVAC system use instead of many
AC in production floor.
Important tips

18. We need to maintain all checklist and preventive maintenance
schedule with regular basis
Here attached following Preventive maintenance and check list
schedule
1. AHU check list
2. Chiller check list
3. Cooling tower check list
4. AC check list
5. ECF check list
Preventive action

19. MYMENSINGH AGRO LIMITED
Mulgaon,Kaligonj,Gazipur.
Daily check list of AC 2021
Section : Month :
SL Name of Inspection
Date
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
1 To check water drop
2 To check noise of blower
3
To check condenser fan
(Outdoor unit for split type)
4
To check blower motor
functioning sound
5
To check record room
temperature (Deg. C)
6 To check remote battery
7 To check filter clean
8
To check compressor Amp
(1T-5A, 1.5T-7A, 2T-10A,
2.5T-12A, 3T-7A (3P), 4T-
9A, 5T-12A(3P)
Signature of Operator
Signature of Engineer

20. MYMENSINGH AGRO LIMITED
Mulgaon,Kaligonj,Gazipur.
Daily check list of AHU 2021
Section : Month :
SL Name of Inspection
Date
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
1 To check Machine running
2 To check cooling tower running
3
To check C.F pump motor rotation of
cooling tower
4 To check CT Fan & V belt tension
5 To check cooling water level OK/not
6
To check cooling water pressure & temp
meter
7
To check Chiller pump motor rotaion ok /
not
8 To check Compressor lub oil level OK/not
9 To check Gas high pressure OK/not
10 To check Gas low pressure OK/not
11 To check chilled water circulation
12 To check chilled water pressure
13 To check chilled water Temp meter
14 To check blower motor
15 To check load Amp.
16 To check flow of Air ok/ not
17 To check room temp ok/ not
Signature of Operator
Signature of Engineer

21. MYMENSINGH AGRO LIMITED
Mulgaon,Kaligonj,Gazipur.
Daily Chiller Log sheet 2021
Section:
Date
Gas High pressure
(10-15 bar)
Gas low pressure (3-
5 bar)
Chilled water
pressure (1-2 bar)
Chilled water Temp.
(18-22 ℃)
Chiller Actuator
Current (A)
Operator
Signature
Engineer
Signature
Remarks
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

22. MYMENSINGH AGRO LIMITED
Mulgaon,Kaligonj,Gazipur.
Daily check list of Cooling tower 2021
Section : Month :
SL Name of Inspection
Date
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
1 To check Machine running
2 To check cooling tower running
3
To check C.F pump motor rotation of
cooling tower
4 To check CT Fan & V belt tension
5 To check cooling water level OK/not
6
To check cooling water pressure &
temp meter Functioning
7
To check any loses connection(Fan
motor frame nut bolt
8 To check pump coupling OK/not
9 abnormal sound of pump yes/x
10 To check pump body temperature H/L
11 To check load Amp
Signature of Operator
Signature of Engineer

23. MYMENSINGH AGRO LIMITED
Mulgaon,Kaligonj,Gazipur.
Daily check list of ECF 2021
Section : Month :
SL Name of Inspection
Date
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
1 To check abnormal sound
2 To check blower
3 All filter clean
4 To check water leakage
5
To check water circulation
system
6
To check duct line with
diffuser
7 To check Motor Amp
8
To check electric
connection/hazard
9 To check platform condition
Signature of Operator
Signature of Engineer