effective ventilation strategieseffective ventilation...

Effective Ventilation StrategiesEffective Ventilation StrategiesEffective Ventilation StrategiesEffective Ventilation Strategies

Ron Pariseau Ron Pariseau Owner of Green R, Inc. Owner of Green R, Inc.

What do we want in an EfficientWhat do we want in an EfficientWhat 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.



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?



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?

Always install ventilation equipment in accordance to the

Always install ventilation equipment in accordance to theequipment in accordance to the

manufacturers instructions.equipment in accordance to the

manufacturers instructions.

How much Fresh Air do I need?How much Fresh Air do I need?

ASHRAE 62.2pASHRAE 62.2pASHRAE 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

H h f h i i d dH h f h i i d dHow 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 cfm2800 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 cfmTotal 58 cfmTotal 58 cfm

Put thought into location of Fresh Air Intake.Put thought into location of Fresh Air Intake.

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 recommendationmanufactures 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 kWill 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?

Supply Ventilation SystemsSupply Ventilation Systems

The introduction of fresh air through mechanical

means creating a

The introduction of fresh air through mechanical

means creating ameans 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 gundesigned holes.

gundesigned holes.

Supply Ventilation DesignSupply Ventilation DesignSupply Ventilation DesignSupply Ventilation Design

ProsPros

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 airOur fresh air is filtered and conditioned. Excellent distribution of fresh airExcellent distribution of fresh air.Low cost of installation. Excellent distribution of fresh air.Low cost of installation.

ConsCons

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 areSince 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 extremeWe 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 thshoulder 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.

ConsCons

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?

Supply Ventilation with AirCyclerSupply 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

What is the operational logic ofWhat is the operational logic ofWhat is the operational logic of the AirCycler program?

What is the operational logic of the AirCycler program?

Default: Ten minutes of ventilation every thirty minutesDefault: Ten minutes of ventilation every thirty minutesminutes.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 minutesfor 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 shutstwenty 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 theheating 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.

ProsPros

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.

ConsConsComfort issues:Comfort issues:

Cold air coming out of the returnFrequency of HVAC system runningCold air coming out of the returnFrequency of HVAC system running

Installation issues:Do you really know how much fresh air you are

Installation issues:Do you really know how much fresh air you are y y yintroducing into the house?Has anyone measured the amount of fresh air being introduced?

y y yintroducing 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?

ConsCons

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 iodicallDoes 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?

Exhaust Ventilation SystemsExhaust Ventilation Systems

The exhaust of stale air through mechanical means creating a

The exhaust of stale air through mechanical means creating ameans creating a

negative pressure inside the house and causing

means creating a negative pressure inside the house and causing

outdoor air to be introduced through

designed and

outdoor air to be introduced through

designed and gundesigned holes.

gundesigned holes.

Exhaust Ventilation DesignExhaust 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 hCeiling 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 fanDo you locate your fan to exhaust air from areas kitchen or bathrooms?

Location of fanDo 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?

Exhaust Ventilation DesignExhaust 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 inletsWhere is outdoor being introduced from.

Passive air inletsPassive air inlets.Infiltration through path of least resistance.Passive air inlets.Infiltration through path of least resistance.

ProsPros

We know how much fresh air we are introducing.We know how much fresh air we are introducing.gLow initial cost.Works best in small areas or with

gLow initial cost.Works best in small areas or withWorks 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 kOption for house with limited ductwork.Option for house with limited ductwork.

Con’sCon’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.

gAre 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.

Con’sCon’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 houseintroduced into house.introduced into house.

B l d V til ti S tB l d V til ti S tBalanced Ventilation SystemBalanced 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 equalmeans in equal quantities, resulting in a negligible effect

means in equal quantities, resulting in a negligible effectin a negligible effect

on the pressure inside the house.

in a negligible effect on the pressure inside the house.

Balanced Ventilation DesignBalanced Ventilation Design

Balanced ventilation equipmentMixing boxesRecovery Ventilators

Balanced ventilation equipmentMixing boxesRecovery VentilatorsRecovery Ventilators

HRV vs ERV

Ducting balanced ventilation systems

Recovery VentilatorsHRV vs ERV

Ducting balanced ventilation systems

Return – Return Ducted ERVReturn – Return Ducted ERVReturn – Return Ducted ERVReturn – 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 airdistribute 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.

Totally ducted ERVTotally ducted ERVTotally ducted ERVTotally ducted ERV

Thi i th Id l d i b t it h it t i tThi i th Id l d i b t it h it t i tThis 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 theDon 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.

Semi-Ducted ERVSemi-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.

Pro’sPro’s

This is the most efficient system.You have the greatest control of theThis is the most efficient system.You have the greatest control of theYou 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 exhaustingand stale air you are exhausting .Tempering of fresh air with recovery core

and stale air you are exhausting .Tempering of fresh air with recovery corecore.core.

Pro’sPro’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 airOur fresh air is getting filtered. Good distribution of fresh airGood 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 lalerts on wall controls.alerts on wall controls.

Con’sCon’s

This is the most expensive system to install.This is the most expensive system to install.

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 InstituteHome Ventilation InstituteHome Ventilation Institute

h i

Home Ventilation Institute

h iww.hvi.orgCertified Products Catalog

ww.hvi.orgCertified Products CatalogSection 3 HRV’s & ERV’sSection 3 HRV’s & ERV’s

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.

What to look for whenWhat to look for whenWhat to look for when evaluating ERV’s:

What to look for when evaluating ERV’s:

TRE – Total Recovery EfficiencyTRE – Total Recovery EfficiencyCombination of both sensible and latent recovery Most manufactures list only sensibly recoveryCombination of both sensible and latent recovery Most manufactures list only sensibly recovery

Airflow PerformanceWhat should my effective airflow be taking into account the duct design?

Airflow PerformanceWhat 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?yy

Hybrid Ventilation SystemsHybrid 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 land have ventilation cycle as a default. and have ventilation cycle as a default.

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 tAll 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 criticalA 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 tA maintenance program needs to be provided to the homeowner as well as instruction on the operation of the system.

A maintenance program needs to be provided to the homeowner as well as instruction on the operation of the system.

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 yCalculate the amount of fresh air needed.Pick a good source of fresh air toPick 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 oC oose a p ope e t at o co t o

Effective Ventilation StrategiesEffective Ventilation StrategiesEffective Ventilation StrategiesEffective Ventilation Strategies

Ron Pariseau Ron Pariseau Owner of Green R, Inc. Owner of Green R, Inc.

effective ventilation strategieseffective ventilation...

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