Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

ME 462/562: Sustainable Energy – an Exergy Analysis Spring 2014

Psychrometric processes

Psychrometric processes 2/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

Why worry about evap cooling? 1

Psychrometric processes 3/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

Why worry about evap cooling? 2

Psychrometric processes 4/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

The psychrometric chart

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Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

Sensible heating / cooling

cooling heating

1 22

Psychrometric processes 6/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

Heating with humidification

heating

1

2

+ water

3

Psychrometric processes 7/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

cooling with dehumidification

cooling

1

x

- water

2

Psychrometric processes 8/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

Adiabatic (evaporative) cooling

`

1

+ water2

Psychrometric processes 9/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

Adiabatic mixing

` 1

3

2

Psychrometric processes 10/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

Efficiencies for simple heating

Psychrometric processes 11/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

Efficiencies for heat & humidification

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Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

Efficiency for evaporative cooling

Psychrometric processes 13/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

An adsorption chiller

Psychrometric processes 14/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

The experimental setup

Psychrometric processes 15/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

Process temperatures30.2/16.7

30.5/19.743.5/2117.3/16.7

26.7/19.820.4/19.8

33.7/23.860.8/30.1

49.8/29.4

DRY BULB / WET BULB

Psychrometric processes 16/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

Performance - energy

4

Psychrometric processes 17/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

Performance - exergy

Psychrometric processes 18/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

direct vs. indirect evap cooling

Psychrometric processes 19/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

can we do better?

Psychrometric processes 20/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

and even better?

Psychrometric processes 21/21

Mechanical EngineeringME462/562 Sustainable Energy:

an Exergy Analysis

the real thing

a “coolerado” air conditioner