Editing Heat recovery ventilation (section)

== Advantages and disadvantages ==
Source:<ref name=":2" />

{| class="wikitable"
|Type of HRV
|Advantages
|Disadvantages
|Performance parameters
|Efficiency %
|Pressure drop ([[Pascal (unit)|Pa]])
|Humidity control
|-
|Rotary thermal wheel
|High efficiency

Sensible and latent heat recovery

Compact design

Frost control available
|Cross contamination possible<br />Requires adjacent airstreams

Mechanically driven, requiring energy input
|Rotation speed

Air velocity

Wheel porosity
|80+
|4-45
|Yes
|-
|Fixed plate
|No moving parts hence high reliability

High heat transfer coefficient

No cross contamination

Frost control possible

Sensible and latent heat recovery
|High pressure loss across exchanger

Limited to two separate air streams

Condensation build up

Frost building up in cold climates
|Material type

Operating pressure

Temperature

Flow arrangement
<br />
|70-90
|7-30
|Yes
|-
|Heat pipes
|No moving parts, high reliability

No cross contamination

Low pressure loss

Compact design

Heat recovery in two directions possible
|Requires close air streams

Internal fluid should match local climate conditions
|Fluid type

Contact time

Arrangement/configuration

Structure
|80
|1-5
|No
|-
|Run-around
|Airstreams can be separate

No cross contamination

Low pressure loss

Multiple sources of heat recovery
|Multiple pumps required to move fluid

Difficult to integrate into existing structures

Low efficiency

Cost
|Exchanger type

Fluid type

Heat source
|50-80
|~1
|No
|-
|Phase change materials
|Easy incorporation into building materials

Offset peak energy demands

No pressure loss

No cross contamination

No moving parts

Long life cycle
|Thermal storage as opposed to instantaneous transfer

Expensive

Not proven technology

Difficulty in selecting appropriate material
|Impregnation method
|~
|0
|No
|}

=== Types of energy recovery devices ===
{| class="wikitable"
|-
! Energy recovery device
! Type of transfer
|-
| [[Thermal wheel|Rotary enthalpy wheel]]
| Total and sensible
|-
| [[Recuperator|Fixed plate]]
| Total** and sensible
|-
| [[Heat pipe]]
| Sensible
|-
| [[Run around coil]]
| Sensible
|-
| [[Thermosiphon]]
| Sensible
|-
| Twin towers<ref>{{cite book |url=https://archive.org/details/2000ashraehandbo00amer/page/44 |title=ASHRAE Systems and Equipment Handbook |date=July 2000 |publisher=American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) |isbn=978-1883413804 |page=[https://archive.org/details/2000ashraehandbo00amer/page/44 44.17] |chapter=Chapter 44: Air-Air Energy Recovery |chapter-url=http://reverseflow.com/wp-content/uploads/2013/05/ASHRAE-Chapter-44.pdf}}</ref>
| Sensible
|}
<nowiki>**</nowiki>Total energy exchange only available on hygroscopic units and condensate return units