The document discusses heat recovery ventilation (HRV), which is a mechanical system that provides fresh air while improving climate control and reducing energy consumption through a heat exchanger. It outlines the advantages of HRVs, including continuous fresh air supply, energy efficiency, condensation elimination, and comfort, while also noting disadvantages like high installation costs and maintenance requirements. The importance of HRVs in providing indoor air quality and energy efficiency is emphasized, alongside a comparison with energy recovery ventilation (ERV).

1. HEAT RECOVERY VENTILATION (HRV)
1

2. OVERVIEW
• Introduction
• Types of mechanical ventilation
• Heat recovery ventilation(HRV)
• Why HRV’s?
• Components of HRV
• Working
• Advantages of HRV
2

3. OVERVIEW(Cont..)
• Disadvantages of HRV
• Operating a HRV
• HRV maintenance
• Similar to HRV’s
• ERV’s vs HRV’s
• Conclusion
3

4. INTRODUCTION
4
Ventilating is the process of replacing air in any space
to provide high indoor air quality
Methods - mechanical/forced and natural types
Windows serve as a fine strategy for natural
ventilation in mild climatic conditions. But natural
ventilation depends on local conditions & wind
shading, which are beyond human control

5. INTRODUCTION( Contd...)
Also, According to US Environmental Protection Agency,
indoor air pollution levels are five times higher than
outdoors which demands - Mechanical Ventilation
Mechanical ventilation systems circulate fresh air using
ducts and fans, rather than relying on airflow through
small holes or cracks in a home’s walls, roof, or windows
The advantages of mechanical ventilation are better air
quality, more control and improved comfort
5

6. TYPES OF MECHANICAL VENTILATION
Supply
Ventilation
Systems—Hot
or Mixed
Climates
Balanced
Ventilation
Systems—All
Climates
Heat Recovery
Ventilation
(HRV)
Energy
Recovery
Ventilation
(ERV)
Exhaust
Ventilation
Systems—Cold
Climates
6

7. HEAT RECOVERY VENTILATION (HRV)
Heat recovery ventilation( HRV) is an energy recovery
ventilation system using equipment known as a heat
recovery ventilator which employs a counter-flow heat
exchanger between the inbound and outbound air flow
HRV provides fresh air and improved climate control,
while also saving energy by reducing heating (and
cooling) requirements
7

8. WHY HRV’s?
Prefer
HRV’s
To reduce
energy
consumption
Improved air
quality
Provide
architectural
fancy without
compromising
ventilation
8

9. COMPONENTS OF HRV
 Fans
 Filters
 Defrost mechanisms or Pre-heater
 Operating controls
 Ducts
 Heat exchange core
9

10. COMPONENTS OF HRV(Contd..)
10
fitzritz.compc-

11. WORKING
 Intake Air
Air from atmosphere is taken via ducts
Air is filtered
 Heat Exchange Core
Moves through insulated ducts
11

12. WORKING(Contd..)
 Fresh Air To Building
Air reaches circulating fan
Fan distributes air throughout the building
 Stale Air From Building
The air is collected
12

13. WORKING(Contd.…)
 Heat Exchange Core
Transfers the heating or cooling effect of stale air
to the fresh air intake for next cycle
13
www.primexfits.comPc

14. WORKING(Contd..)
14
www.thestovestore.netPC

15. ADVANTAGES OF HRV
Continuous supply of fresh air
Energy efficient ventilation
Condensation elimination
Comfort
15

16. ADVANTAGES OF HRV(Contd..)
16
• 1) Continuous Supply of Fresh Air
– Filtered fresh air is circulated throughout day and
night
– Most people spend over 80% of their time
indoors, 50% of all illnesses are either caused by,
or aggravated by poor indoor air quality
– The HRV System continuously removes stale moist
air creating a healthy environment

17. ADVANTAGES OF HRV(Contd..)
17
• 2) Energy Efficient Ventilation
– A HRV systems save money and reduce energy for
heating by re-using heat that is lost via standard
extract systems
– A HRV is designed to operate continuously at low
rate to minimize electrical energy consumption

18. ADVANTAGES OF HRV(Contd..)
18
• 3) Condensation Elimination
– Water vapour will be removed as it is produced
– As a result there is no moisture condensation
which causes rot, damp, condensation or mould
growth
– No fungal growth in bathrooms

19. ADVANTAGES OF HRV(Contd..)
19
• 4) Comfort
– Comfort levels are superior in a house fitted with
a Heat Recovery Ventilation system
– Irrespective of weather conditions, draught free
balanced ventilation is provided all the time
– Extra security when windows are closed

20. DISADVANTAGES OF HRV
20
Needs regular maintenance
Filters need cleaning or replacing every 6–12 months.
High installation cost
Not much beneficial in hot weather conditions

21. OPERATING A HRV
21
• Controls
– Allows user to adjust the rate of ventilation and
humidity level to certain extend
– Depending upon models & installation, controls
may be located on HRV itself or in rooms
– Pollutant sensors are also installed
– Can turned off HRV, when required

22. HRV MAINTENANCE
22
Clean or replace air filters
Clean the heat-exchange core
Inspect ductwork
Arrange for annual servicing
Clean the condensate drain and pan

23. SIMILAR TO HRV’s
23
An alternative system called energy recovery ventilation
(ERV) works in a similar way as heat recovery ventilators
Transfers moisture from the outgoing airstream to the
incoming air
It’s the disadvantage of ERV, which are covered up by
the HRV’s

24. HRV’s vs. ERV’s
HRV core ERV core
24
www.primexfits.compc

25. CONCLUSION
Provides fresh air and improved climate control
Most efficient in saving energy
All buildings require source of fresh air, the need for
HRVs has become obvious
The best technology currently available for reducing
radon levels
25

26. REFERENCES
• Solutions for Energy Efficient and Sustainable Heating of Ventilation Air: A Review
A. Žandeckis*, K. Kļaviņa, M. Dzikēvičs, V. Kirsanovs and G. Žogla,Journal of
Engineering Science and Technology Review 8 (3) (2015) 98-111
• Akbari K., Oman R.(2013).”Impacts of Heat Recovery Ventilators on Energy Savings
and Indoor Radon in a Swedish Detached House.”WSEAS Transactions on
Environment & Development, 9(1),2224-3496.
• Natural Resources Canada’s Office of Energy Efficiency(2012), “Heat recovery
ventilators”,HTTP://WWW.HOUSING.YK.CA/PDF/HRV.PDF
• Akbari et.al (2013) "Impacts of heat recovery ventilators on energy savings and
indoor radon level", Management of Environmental Quality: An International
Journal, Issue 5,Volume 24, Page 682 – 694
• Juha Jokisalo , Jarek Kurnitski , Mika Vuolle , Antti Torkki(2003) ”Performance of
Balanced Ventilation with Heat Recovery in Residential Buildings in a Cold
Climate”The International Journal of Ventilation,2(4) 223 -236
26

27. • Ambrose Dodoo, Lief Gustavasson, Roger Sathre (2011) “Primary energy
implications of ventilation heat recovery in residential buildings” Energy and
Buildings, 43(7) 1566 – 1572
• Efficiency “International journal of ventilation 6 Olli Seppanen (2008)” Ventilation
Srtategies for Good Indoor Air Quality and Energy(4)297-306
• P.Wargocki(2013) “The Effects of ventilation in homes on health” International
journal of ventilation 12(2)101-118
27

28. 28