Freecooling solution helps utilize the ambient air to cool the facility there by reducing the chiller consumption upto 25%.

1. Enthalpy Economizers
2011 - 12

2. Architecture
ConnectM Enthalpy
Economizers
GPRS/Zigbee
ConnectM Enthalpy
Economizers
ConnectM Enthalpy
Economizers
ConnectM Enthalpy
Economizers

3. ConnectM Enthalpy Economizers
Return Air
ConnectM Enthalpy
Economizers
Temperature D Temperature
& Humidity
& CO2 Sensor & CO Sensor
a
AHU m
P
e
r
CWV
Work Station
Chiller
Building

4. Scenario :1 (Ambient Temperature is greater than Return Air Temperature)
Return Air
ConnectM Enthalpy
Economizers
Temperature
Sensor
D Temperature
& Humidity
Sensor
a
AHU m
P
e
r
CWV
Work Station Damper
Closed
Chiller
Building

5. Scenario :2 (Ambient Temperature is less than Return Air Temperature)
Return Air
ConnectM Enthalpy
Economizers
Temperature D Temperature
& Humidity
& CO2 Sensor & CO Sensor
a
AHU m
P
e
r
CWV
Work Station Damper
Open to
allow cold
Air
Regulate
Chilled
water
supply
Chiller
Building

6. Why Enthalpy Solution?
 Utilize the ambient air temperature to cool required temperature
in the facility
 Intelligently saves energy by intelligently controlling the chilled
water valve and motorized fresh air damper
 Avoid manual operation of fresh air damper and chilled water
valve
 Get fresh air inside the premises for better comfort

7. Features
 Monitor all the parameters remotely over GPRS/Zigbee
 Automatic control of chilled water valve and motorized damper
 All the configuration can be done through HMI display
ex. Temperature/Humidity/Ambient temperature Threshold value
 Password protection for configuration
 Sensor health indication in local display and application
 Data logging & analytics
 Report generation for energy saving etc..
 SMS alert incase of emergency/Fault

8. Working Principle
Chilled Water Valve:-
 CWV operates by comparing threshold value of return air
temperature with real time value of return air temperature
 If the return air temperature is greater than the threshold value
of return air temperature then the CWV should be open and vice
versa
Motorized Damper:-
 If the relative humidity is not in range then the motorized
damper should be closed
 If the relative humidity is in range, and the ambient air
temperature is less than the return air temperature then the
motorized damper should be open
 If the relative humidity is in range, and the ambient air
temperature is greater than the return air temperature then the
motorized damper should be close

9. Observation
 Before installation, the consumption of AHU1 is 1192 for Six days
Without EMS Solution Implementation
AHU 1 consumption in
DATE Days Opening Closing Day
8-Nov-11 Tue 426754 427143 389
9-Nov-11 Wed 427143 427476 333
10-Nov-11 Thus 427476 427708 232
11-Nov-11 Fri 427708 427946 238
12-Nov-11 Sat 427946 427946 0
13-Nov-11 Sun 427946 427946 0
Total consumption 1192
 Afore installation, the consumption of AHU1 is 916 for Six day
With EMS Solution Implementation
AHU 1 consumption in
DATE Days Opening Closing Day
15-Nov-11 Tue 428790 428980 190
16-Nov-11 Wed 428980 429308 328
17-Nov-11 Thus 429308 429499 191
18-Nov-11 Fri 429499 429706 207
19-Nov-11 Sat 429706 429706 0
20-Nov-11 Sun 429706 429706 0
Total consumption 916

10. Case Study
 We have saved 23% by using Enthalpy solution
Total readings Avg per day Per 30 Working days
Total
Total units
Without units Without savings % savings Without units % of
EMS With EMS saved EMS With EMS per day per day EMS With EMS saved savings
1192 916 276 198.7 152.7 46 30.1 5960 4580 1380 23%

11. Thank you.