Coolator 17

CORE TECHNOLOGY

SENHEX: The core technology of  COOLATOR-10 is the next-generation Sensible heat exchanger. Senhex stands for ’Sensible Heat Exchanger’. It is  a cross-flow, plate-type polymeric exchanger. The Warm, primary air flows in enclosed channels and gives up its heat to water films flowing down the other side of the polymeric plates. A secondary air stream flowing in the direction opposite to the water evaporates water before it is exhausted outside. Thus, in indirect cooling phase of indirect direct evaporative  cooler  the primary air is cooled without any moisture addition.

Features & Benifits

OVERVIEW

Payback Period

Direct evaporative cooling (Single Stage Cooling)

Indirect evaporative cooling

With direct evaporative cooling, outside air is blown through a water-saturated medium (usually cellulose -Honey comb cooling pads) and cooled by evaporation. The cooled air is circulated by a blower.

Direct evaporative cooling adds moisture to the air stream until the air stream is close to saturation. The dry bulb temperature* is reduced, while the wet bulb temperature** stays the same.

*dry bulb: Sensible air temperature (as measured by a Thermometer).
**wet bulb: The lowest air temperature achievable by evaporative Air Cooilng System.

In Indirect evaporative cooling Hot Air and water travel in different channels and do not come directly in contact with each other, hence the name Indirect Evaporative Cooling.

In IEC, warm primary air cools by losing its heat to a thin water film on the other side of a conducting surface. Another air stream called Secondary or Scavenging air moves upward through the falling water and evaporates this water, thereby, converting most of the sensible heat into latent heat, before it is exhausted to the outside. Thus, the primary air is cooled without coming in contact with the water stream. Hence, IEC reduces the dry bulb temperature, wet-bulb temperature, and the enthalpy of the primary air without adding any moisture to it.

Indirect direct evaporative cooling ( Two Stage Cooling )

In Indirect Evaporative cooling, the primary air is cooled without coming in contact with water. Hence in first stage air is cooled without adding any moisture to it and then cooled further in the second stage with the direct evaporative cooling process with extra reduction of 5 Degree c .The combined process is called indirect direct evaporative cooling.

Temperature reduction achievable using indirect direct evaporative cooling

First, calculate the dry bulb and wet bulb temperatures achievable with indirect evaporative cooling:
1. Temp drop achievable = (dry bulb – wet bulb ) x (efficiency of indirect module)
Example: (42 degrees C- 23.5degrees C) x .7 = 13 degreesC.

2. Achievable temp = dry bulb – temp drop achievable
Example: 42 degrees – 13 degrees = 29 degrees DB/19.5 degrees WB.

3. Starting DB: 42 degrees
Ending DB: 29 degrees

Then use the dry bulb/wet bulb values from step 3 to calculate the dry bulb/wet bulb temperatures achievable with direct evaporative cooling:
4. Temp drop achievable: (dry bulb – wet bulb ) x (efficiency of the media)
Example: (29 degrees – 19.5 degrees) x .9 = 8.6 degreesC.

5. Achievable temp = dry bulb – temp drop achievable
Example: 29 degrees – 8.6 degrees = 20.4 degrees DB/19.5 degrees WB.

6. Total temperature reduction using indirect/direct evaporative cooling:
Starting DB: 42 degrees C
Ending DB: 20.4 degrees C