SLIDE 1
Effective Ventilation Strategies Effective Ventilation Strategies Effective Ventilation Strategies Effective Ventilation Strategies
Ron Pariseau Ron Pariseau Owner of Green R, Inc. Owner of Green R, Inc.
SLIDE 2 What do we want in an Efficient What do we want in an Efficient What do we want in an Efficient Ventilation System? What do we want in an Efficient Ventilation System?
We want to introduce the amount of fresh air
needed for good IAQ.
We want to introduce the amount of fresh air
needed for good IAQ.
- Too much would be an energy drain.
- Too little may not be good for the health of the homeowners.
- Too much would be an energy drain.
- Too little may not be good for the health of the homeowners.
SLIDE 3 What do we want in an Efficient What do we want in an Efficient What do we want in an Efficient Ventilation System? What do we want in an Efficient Ventilation System?
We want a properly installed and maintained system. We want a properly installed and maintained system.
- Where is the fresh air being introduced coming from?
- Is the fresh air being introduced into the house filtered?
- How easy is it to change or clean the filters?
- Where is the fresh air being introduced coming from?
- Is the fresh air being introduced into the house filtered?
- How easy is it to change or clean the filters?
- To what extent are the homeowner needed to operate the system?
- Has the installation been inspected?
- Does the homeowner understand the operation and scheduled
- To what extent are the homeowner needed to operate the system?
- Has the installation been inspected?
- Does the homeowner understand the operation and scheduled
maintenance needed to maintain the performance of the system? maintenance needed to maintain the performance of the system?
SLIDE 4 What do we want in an Efficient What do we want in an Efficient What do we want in an Efficient Ventilation System? What do we want in an Efficient Ventilation System?
How do we choose the proper system?
- What are the Pro’s & Con’s of the different ventilation systems?
- Ho
do e compa e the efficiencies of diffe ent s stems?
How do we choose the proper system?
- What are the Pro’s & Con’s of the different ventilation systems?
- Ho
do e compa e the efficiencies of diffe ent s stems?
- How do we compare the efficiencies of different systems?
- How do we compare the efficiencies of different systems?
SLIDE 5
Always install ventilation equipment in accordance to the Always install ventilation equipment in accordance to the equipment in accordance to the manufacturers instructions. equipment in accordance to the manufacturers instructions.
SLIDE 6
How much Fresh Air do I need? How much Fresh Air do I need?
ASHRAE 62.2p ASHRAE 62.2p ASHRAE 62.2p 1 cfm per 100 sq ft of floor area + ASHRAE 62.2p 1 cfm per 100 sq ft of floor area + (The number of bedrooms + 1) + (The number of bedrooms + 1) 7.5 7.5
SLIDE 7
H h f h i i d d H h f h i i d d How much fresh air is needed for a 2800 sq ft house with How much fresh air is needed for a 2800 sq ft house with q 3 bedrooms? q 3 bedrooms?
2800 x .01 = 28 cfm 2800 x .01 = 28 cfm + (3+ 1) x 7 5 = 30 cfm + (3+ 1) x 7 5 = 30 cfm (3+ 1) x 7.5 = 30 cfm Total 58 cfm (3+ 1) x 7.5 = 30 cfm Total 58 cfm Total 58 cfm Total 58 cfm
SLIDE 8 Put thought into location of Fresh Air I ntake. Put thought into location of Fresh Air I ntake.
Don’t bring your fresh air in from off the roof. Keep ten feet away from any mechanical exhaust or
manufactures recommendation
Don’t bring your fresh air in from off the roof. Keep ten feet away from any mechanical exhaust or
manufactures recommendation manufactures recommendation.
Things to consider:
Are you near an outside grill?
ll b k d h k
manufactures recommendation.
Things to consider:
Are you near an outside grill?
ll b k d h k
Will cars be parked near the intake? Is the trash bin close to the intake? What kind of shrubs are located close to the intake? Will cars be parked near the intake? Is the trash bin close to the intake? What kind of shrubs are located close to the intake? Don’t get to close to the ground. Don’t locate intake under a deck. Can the screen on the intake be easily cleaned? Don’t get to close to the ground. Don’t locate intake under a deck. Can the screen on the intake be easily cleaned?
SLIDE 9
Supply Ventilation Systems Supply Ventilation Systems
The introduction of fresh air through mechanical means creating a The introduction of fresh air through mechanical means creating a means creating a positive pressure inside the house and causing means creating a positive pressure inside the house and causing indoor air to be exhausted through designed and indoor air to be exhausted through designed and g undesigned holes. g undesigned holes.
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Supply Ventilation Design Supply Ventilation Design Supply Ventilation Design Supply Ventilation Design
SLIDE 11
Pros Pros
We know the quality of fresh air being
introduced.
We know the quality of fresh air being
introduced.
Our fresh air is filtered and conditioned. Excellent distribution of fresh air Our fresh air is filtered and conditioned. Excellent distribution of fresh air Excellent distribution of fresh air. Low cost of installation. Excellent distribution of fresh air. Low cost of installation.
SLIDE 12 Cons Cons
We really don’t know how much fresh air we are
introducing into the house.
Since we don’t know the amount of air we are We really don’t know how much fresh air we are
introducing into the house.
Since we don’t know the amount of air we are Since we don t know the amount of air we are
introducing we don’t know the costs associated with heating or cooling the fresh air.
We can assume that the cost will be greater during the extreme
Since we don t know the amount of air we are
introducing we don’t know the costs associated with heating or cooling the fresh air.
We can assume that the cost will be greater during the extreme We can assume that the cost will be greater during the extreme heating & cooling seasons, i.e. we introduce the most air when the delta T is the greatest. The homeowner will probably have the windows open during the h ld th We can assume that the cost will be greater during the extreme heating & cooling seasons, i.e. we introduce the most air when the delta T is the greatest. The homeowner will probably have the windows open during the h ld th shoulder months.
The thermostat is not the proper control to base our
ventilation strategy on.
shoulder months.
The thermostat is not the proper control to base our
ventilation strategy on.
You may get too much ventilation during the extreme heating and cooling seasons and not enough during the shoulder months. You may get too much ventilation during the extreme heating and cooling seasons and not enough during the shoulder months.
SLIDE 13
Cons Cons
Maintenance issues: Is there easy access to filter? Maintenance issues: Is there easy access to filter? Is the filter readily availability? Is the intake easily reached and cleaned? Is the filter readily availability? Is the intake easily reached and cleaned?
SLIDE 14
Supply Ventilation with AirCycler Supply Ventilation with AirCycler
The AirCycler is a programmable ventilation
controller for Central Fan Supply Ventilation
The AirCycler is a programmable ventilation
controller for Central Fan Supply Ventilation
SLIDE 15
What is the operational logic of What is the operational logic of What is the operational logic of the AirCycler program? What is the operational logic of the AirCycler program?
Default: Ten minutes of ventilation every thirty
minutes
Default: Ten minutes of ventilation every thirty
minutes minutes.
If there is no call for heating or cooling in a twenty
minute span the AirCycler will turn the air handler on for ten minutes minutes.
If there is no call for heating or cooling in a twenty
minute span the AirCycler will turn the air handler on for ten minutes for ten minutes.
If it takes less than ten minutes to satisfy a call for
heating or cooling the AirCycler will start a new twenty minute countdown when the air handler shuts for ten minutes.
If it takes less than ten minutes to satisfy a call for
heating or cooling the AirCycler will start a new twenty minute countdown when the air handler shuts twenty minute countdown when the air handler shuts down.
If it takes more than ten minutes to satisfy a call for
heating or cooling the model FR-V will close the twenty minute countdown when the air handler shuts down.
If it takes more than ten minutes to satisfy a call for
heating or cooling the model FR-V will close the heating or cooling the model FR V will close the damper at the end of ten minutes. heating or cooling the model FR V will close the damper at the end of ten minutes.
SLIDE 16
Pros Pros
We're closer to the ventilation rate we
want to achieve.
We're closer to the ventilation rate we
want to achieve.
Low cost of installation. We know the quality of fresh air being Low cost of installation. We know the quality of fresh air being
introduced.
Our fresh air is getting filtered and
introduced.
Our fresh air is getting filtered and
some conditioning.
Excellent distribution of fresh air.
some conditioning.
Excellent distribution of fresh air.
SLIDE 17
Cons Cons
Comfort issues: Comfort issues: Cold air coming out of the return Frequency of HVAC system running Cold air coming out of the return Frequency of HVAC system running I nstallation issues: Do you really know how much fresh air you are I nstallation issues: Do you really know how much fresh air you are
y y y introducing into the house?
Has anyone measured the amount of fresh air being
introduced? y y y introducing into the house?
Has anyone measured the amount of fresh air being
introduced? introduced?
Have you calculated the amount you need and
programmed the AirCycler or just left it on the default setting? introduced?
Have you calculated the amount you need and
programmed the AirCycler or just left it on the default setting? setting? setting?
SLIDE 18
Cons Cons
Maintenance issues: Is there easy access to filter? Maintenance issues: Is there easy access to filter? Is the filter readily availability? Is the intake easily reached and cleaned? Does the homeo
ne kno the need to pe iodicall
Is the filter readily availability? Is the intake easily reached and cleaned? Does the homeo
ne kno the need to pe iodicall
Does the homeowner know they need to periodically
check the operation of the motorized damper?
Does the homeowner know they need to periodically
check the operation of the motorized damper?
SLIDE 19 Exhaust Ventilation Systems Exhaust Ventilation Systems
The exhaust of stale air through mechanical means creating a The exhaust of stale air through mechanical means creating a means creating a negative pressure inside the house and causing means creating a negative pressure inside the house and causing
introduced through designed and
introduced through designed and g undesigned holes. g undesigned holes.
SLIDE 20 Exhaust Ventilation Design Exhaust Ventilation Design
Continuous running or intermittent fan
Inline fan pulling from multiple locations.
C ili t d f i b th kit h
Continuous running or intermittent fan
Inline fan pulling from multiple locations.
C ili t d f i b th kit h
Ceiling mounted fan in bathroom or kitchen. Bathroom fans programmed to run intermittently. Range hood designed to run at a low speed continuously. Ceiling mounted fan in bathroom or kitchen. Bathroom fans programmed to run intermittently. Range hood designed to run at a low speed continuously.
Location of fan
Do you locate your fan to exhaust air from areas kitchen or
bathrooms?
Location of fan
Do you locate your fan to exhaust air from areas kitchen or
bathrooms? bathrooms?
Do you locate the fan to exhaust from the central location?
bathrooms?
Do you locate the fan to exhaust from the central location?
SLIDE 21
Exhaust Ventilation Design Exhaust Ventilation Design
Make sure that all combustion appliances
are sealed combustion.
Make sure that all combustion appliances
are sealed combustion.
Where is outdoor being introduced from.
Passive air inlets
Where is outdoor being introduced from.
Passive air inlets Passive air inlets. Infiltration through path of least resistance. Passive air inlets. Infiltration through path of least resistance.
SLIDE 22
Pros Pros
We know how much fresh air we are
introducing.
We know how much fresh air we are
introducing. g
Low initial cost. Works best in small areas or with
g
Low initial cost. Works best in small areas or with Works best in small areas or with
multiple exhaust points. O ti f h ith li it d d t k
Works best in small areas or with
multiple exhaust points. O ti f h ith li it d d t k
Option for house with limited ductwork. Option for house with limited ductwork.
SLIDE 23
Con’s Con’s
Are you getting effective distribution of
air being introduced.
Are you getting effective distribution of
air being introduced. g
Are the bedrooms getting any fresh air.
Where is my fresh air coming from.
g
Are the bedrooms getting any fresh air.
Where is my fresh air coming from.
Where is my fresh air coming from.
Is fresh air introduced through a designed hole or
is outside air entering through random infiltration.
Where is my fresh air coming from.
Is fresh air introduced through a designed hole or
is outside air entering through random infiltration.
This design is not recommended for houses with
an attached garage.
This design is not recommended for houses with
an attached garage.
SLIDE 24
Con’s Con’s
Use of designed holes.
Requires homeowner to operate.
Use of designed holes.
Requires homeowner to operate.
Requires homeowner to operate.
No conditioning or filtration of air
introduced into house
Requires homeowner to operate.
No conditioning or filtration of air
introduced into house introduced into house. introduced into house.
SLIDE 25 B l d V til ti S t B l d V til ti S t Balanced Ventilation System Balanced Ventilation System
The introduction of fresh air and the The introduction of fresh air and the exhaust of stale air through mechanical means in equal exhaust of stale air through mechanical means in equal means in equal quantities, resulting in a negligible effect means in equal quantities, resulting in a negligible effect in a negligible effect
inside the house. in a negligible effect
inside the house.
SLIDE 26 Balanced Ventilation Design Balanced Ventilation Design
Balanced ventilation equipment
Mixing boxes Recovery Ventilators
Balanced ventilation equipment
Mixing boxes Recovery Ventilators Recovery Ventilators
HRV vs ERV
Ducting balanced ventilation systems
Recovery Ventilators
HRV vs ERV
Ducting balanced ventilation systems
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Return – Return Ducted ERV Return – Return Ducted ERV Return – Return Ducted ERV Return – Return Ducted ERV
Simplest and Least effective ducting design. Need to run the fan continuously to effectively
distribute fresh air
Simplest and Least effective ducting design. Need to run the fan continuously to effectively
distribute fresh air distribute fresh air.
This results in an energy drain and possible humidity
problems. distribute fresh air.
This results in an energy drain and possible humidity
problems.
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Totally ducted ERV Totally ducted ERV Totally ducted ERV Totally ducted ERV
Thi i th Id l d i b t it h it t i t Thi i th Id l d i b t it h it t i t
This is the Ideal design but it has its restraints. Design the ductwork for minimal resistance. Don’t overextend the duct layout you will sacrifice the This is the Ideal design but it has its restraints. Design the ductwork for minimal resistance. Don’t overextend the duct layout you will sacrifice the Don t overextend the duct layout, you will sacrifice the
performance of the equipment.
Don t overextend the duct layout, you will sacrifice the
performance of the equipment.
SLIDE 29 Semi-Ducted ERV Semi-Ducted ERV
- This is my recommendation for the most effective duct design for
an ERV.
- This is my recommendation for the most effective duct design for
an ERV. an ERV.
- Pull the exhaust for the ERV from the return plenum of the HVAC
system and independently duct the fresh air supply. an ERV.
- Pull the exhaust for the ERV from the return plenum of the HVAC
system and independently duct the fresh air supply.
SLIDE 30
Pro’s Pro’s
This is the most efficient system. You have the greatest control of the This is the most efficient system. You have the greatest control of the You have the greatest control of the
amount of fresh air you are introducing and stale air you are exhausting
You have the greatest control of the
amount of fresh air you are introducing and stale air you are exhausting and stale air you are exhausting .
Tempering of fresh air with recovery
core and stale air you are exhausting .
Tempering of fresh air with recovery
core core. core.
SLIDE 31
Pro’s Pro’s
We know the quality of fresh air being
introduced.
We know the quality of fresh air being
introduced.
Our fresh air is getting filtered. Good distribution of fresh air Our fresh air is getting filtered. Good distribution of fresh air Good distribution of fresh air. Some manufactures have maintenance
l t ll t l
Good distribution of fresh air. Some manufactures have maintenance
l t ll t l alerts on wall controls. alerts on wall controls.
SLIDE 32
Con’s Con’s
This is the most expensive system to
install.
This is the most expensive system to
install.
SLIDE 33
How do I compare the performance of ERV’s How do I compare the performance of ERV’s from different manufactures? from different manufactures?
Home Ventilation Institute Home Ventilation Institute Home Ventilation Institute h i Home Ventilation Institute h i ww.hvi.org Certified Products Catalog ww.hvi.org Certified Products Catalog Section 3 HRV’s & ERV’s Section 3 HRV’s & ERV’s
SLIDE 34 Total Recovery Efficiency (TRE): The total energy (enthalpy) recovered minus the supply fan energy and the
preheat coil energy, divided by the total energy (enthalpy) exhausted plus the exhaust fan energy. This calculation corrects for the effects of cross-leakage and external purchased energy for fans and controls. It is used principally to predict and compare energy performance.
Total Recovery Efficiency (TRE): The total energy (enthalpy) recovered minus the supply fan energy and the
preheat coil energy, divided by the total energy (enthalpy) exhausted plus the exhaust fan energy. This calculation corrects for the effects of cross-leakage and external purchased energy for fans and controls. It is used principally to predict and compare energy performance.
+ 95°F Supply Temp.: Cooling values for one or both of 50 CFM and 117 CFM will be listed according to the ability of
the equipment to meet the test conditions(2). Outdoor air conditions are + 95°F, 50% R.H., indoor air conditions are + 75°F, 50% R.H. Total Recovery Efficiency (see below) is given in place of Sensible Recovery Efficiency (see below) as the latter value is not relevant for cooling load applications.
+ 95°F Supply Temp.: Cooling values for one or both of 50 CFM and 117 CFM will be listed according to the ability of
the equipment to meet the test conditions(2). Outdoor air conditions are + 95°F, 50% R.H., indoor air conditions are + 75°F, 50% R.H. Total Recovery Efficiency (see below) is given in place of Sensible Recovery Efficiency (see below) as the latter value is not relevant for cooling load applications.
SLIDE 35 What to look for when What to look for when What to look for when evaluating ERV’s: What to look for when evaluating ERV’s:
TRE – Total Recovery Efficiency TRE – Total Recovery Efficiency
Combination of both sensible and latent recovery Most manufactures list only sensibly recovery Combination of both sensible and latent recovery Most manufactures list only sensibly recovery
Airflow Performance
What should my effective airflow be taking into account the duct design?
Airflow Performance
What should my effective airflow be taking into account the duct design? duct design?
Does it have a defrost cycle?
duct design?
Does it have a defrost cycle? y
SLIDE 36
Hybrid Ventilation Systems Hybrid Ventilation Systems
Integrated exhaust and supply fans. Whole house dehumidifiers that have a fresh Integrated exhaust and supply fans. Whole house dehumidifiers that have a fresh
air duct.
It is important to understand the different controls
d h il i l d f l
air duct.
It is important to understand the different controls
d h il i l d f l and have ventilation cycle as a default. and have ventilation cycle as a default.
SLIDE 37 Efficiency of the Ventilation System. Efficiency of the Ventilation System.
The efficiency of any one of these ventilation
systems is first predicate to its installation.
All t d t b i t d d t t d t
The efficiency of any one of these ventilation
systems is first predicate to its installation.
All t d t b i t d d t t d t
All systems need to be inspected and tested to
insure they are installed and working properly.
A scheduled maintenance program is critical
All systems need to be inspected and tested to
insure they are installed and working properly.
A scheduled maintenance program is critical
A scheduled maintenance program is critical to the continuing efficiency of any ventilation system.
A i t d t b id d t
A scheduled maintenance program is critical to the continuing efficiency of any ventilation system.
A i t d t b id d t
A maintenance program needs to be provided to
the homeowner as well as instruction on the
A maintenance program needs to be provided to
the homeowner as well as instruction on the
SLIDE 38
Efficiency of the Ventilation System. Efficiency of the Ventilation System.
The design of the system is critical to
the efficiency of the system.
The design of the system is critical to
the efficiency of the system. y y
Calculate the amount of fresh air needed. Pick a good source of fresh air to
y y
Calculate the amount of fresh air needed. Pick a good source of fresh air to
Pick a good source of fresh air to introduce.
Choose a proper ventilation control.
Pick a good source of fresh air to introduce.
Choose a proper ventilation control.
C oose a p ope e t at o co t o C oose a p ope e t at o co t o
SLIDE 39
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Effective Ventilation Strategies Effective Ventilation Strategies Effective Ventilation Strategies Effective Ventilation Strategies
Ron Pariseau Ron Pariseau Owner of Green R, Inc. Owner of Green R, Inc.
