Fundamentals of Energy Recovery Ventilators (ERVs)

Тема 2

https://www.youtube.com/watch?v=ieXLS_YpcQA

Power Plant Ventilation System

okay we're going to go through the

generation room ventilation system so

this consists of intake and exhaust air

which is ducted through the building and

all of the penetrations the building

walls are equipped with motorized

dampers these are necessary for the fire

suppression system they have to close to

seal up the building in the event of a

fire so over here we have two intake

ducts this is where the fresh air comes

into the building one is labeled

combustion air it's normally open

anytime the engines are running this

provides air for the engines and the

first level of cooling the second one is

called cooling air it's normally closed

and we have a thermostat that we set to

somewhere between 70 and 80 degrees when

additional cooling air is needed then it

opens to allow more air into the

building on top of both of these we have

filters they're provided to keep the

bugs and dust out of the room those need

to be checked at least twice a year

more often in a particularly dusty

season or if you have real heavy bugs

now over by the engines we have exhaust

fans there's one for each engine these

take the hot air out of the building and

exhaust it and each one of these is

controlled by a thermostat we typically

leave these set at about 80 degrees so

when the temperature in the room Rises

the thermostat will turn on the fan

and it'll operate as the temperature in

the room drops and the fan will turn

back off every time the fan operates the

motorized damper will open and then when

it's done it'll it'll automatically

close these are pretty much

self-sufficient devices you just need to

check them periodically make sure

they're working properly it's a good

idea just to cycle the thermostat listen

for the fan to turn on and look at the

motorized damper make sure it opens and

make sure it closes when you turn it

back off

 

Тема 3

Fundamentals of Energy Recovery Ventilators (ERVs)

https://www.youtube.com/watch?v=QOSelUK6dpQ

hello welcome here we are today at the

Tec training lab in Melrose Park and

we're we talking about energy recovery

ventilators or ARVs we look at different

types some commercial ones some

residential ones and look at different

heat exchangers as well specifically

rotary wheels and fix plates so let's

take a closer look so the first thing

we're going to look at is a commercial

unit and this one happens to be a wheel

type heat exchanger a commercially that

you typically will find wheels and to

fix plates and even some other types as

well residential ease pretty much to be

fixed plate only you won't see any

wheels residentially so this particular

one happens to be a standalone ERV means

that meaning that it's not attached to a

package rooftop unit although the same

technology here can be put inside a

rooftop unit and all be in one box but

this one happens to be a standalone one

so on here we have two different hoods

you see on both sides of the ERV this

one is an intake hood so we bring in

fresh air into the system and down

through the wheel and then this side

over here return air from the building

exhaust air from the building is coming

up and through and exhausting out this

hood over here so let's take a look

inside this guy here

and as you can see this one has a

Plexiglas on the front of it that's

obviously not a normal scenario normally

there'd be a sheet metal cabinet but

here in the lab we have a plexiglass one

so we can see what things look like on

the inside those there's two fans on

here

one for the intake air for the fresh

outside air to come in and one for the

exhaust air to bring air out of the

building and throw it away so have two

different fans on here on these

commercial type ones they typically do

run at different speeds in order to get

the CFM that we need for each side of

the equation residentially they're off

oftentimes be one motor driving bull

fans and they run in a balanced airflow

we'll take a look at this guy on the

inside open him up

[Music]

this is our heat exchanger here this is

a wheel style heat exchanger it's made

out of a plastic and it has a silica

based gel and pregnant it on to it

you probably have seen these types of

packets before it says silica gel do not

eat don't eat this obviously be very bad

for you right but you'll find this in

your electronics boxes leather shoes

things like that the purpose of that is

to keep the moisture neutral inside that

packaging same kind of stuff is

impregnated on top of this plastic in

order to transfer moisture it can absorb

moisture or release it depending on

which air stream it's in on a given

season and that all happens

automatically there's a small little

motor down here that drives this belt

that belt turns this wheel so here comes

up from inside the building and goes to

the heat exchanger and gives up its

energy which depending on the season

heat goes from hot to cold moisture goes

from high moisture to low moisture so if

it is summertime and we have hot humid

air coming in that means we have cool

drier air that would be leaving the

building right so then the moisture

comes in here and he comes in here right

and it gets transferred on the ceiling

dry as it spins and exhaust back out so

instead of letting the heat and moisture

go into the building the transfers and

goes back out so we get the fresh clean

air molecules to come in but not any of

their energy heating and cooling right

same thing happens the opposite season

in the wintertime we have cold dry air

coming in and we have warmer moisture

air coming out of the building that

warmer moisture air goes into this

Airstream and gets transferred over and

then goes down into the building so we

keep the heat and moisture either

outside the building in the summer or we

keep the heat and moisture inside in the

winter and all that happens

automatically as this heat exchanger

moves it moves at a pretty slow speed

we'll run one in a little bit here but

it's moving at 40 to 90 RPM right like a

record player essentially for anybody

who's old enough to know the record

player is obviously probably only me

we do have two sets of filter banks on

these guys we're filtering both the air

coming in and the air going out I know

it seems weird to filter exhaust air but

in this case we're filtering the air to

want to keep it off of the heat

exchanger media we don't we're not

filtering it for human comfort want to

keep the heat exchanger clean because if

it gets dirty it won't transfer energy

as well so we're filtering both of these

air streams on here and then going down

through the curve we would connect into

the building system there are other ways

to do it as well we can have it like a

side discharge unit we can have it

connecting into a rooftop unit there's

different orientations that we can have

but the general feel would be kind of

like that let's take a look at a

different style unit now a bit stand up

here happens to be a residential style

HRV HRV stands for heat recovery

ventilator it is a form of an ERV energy

recovery ventilator but it doesn't do

any moisture transfer it just does dry

Energy residential you could have a RVs

or HRVs and the same commercially same

with wheels same with plates all will

come in both forms this one just happens

to be an HRV just coincidentally

normally on a residence will be ducting

from the bathrooms as our exhaust source

because we have to have exhaust there

anyway usually the bathrooms and then

maybe one general hallway common area we

are exhaust air flow path and that'll go

through the heat exchanger and be

exhausted out and the fresh air coming

in will typically be ducted into the

return side of our furnace or fan coil

where it can then use the regular

distribution system to supply the entire

house let's open this guy up here

luckily I'm barely tall enough to do

that all right so this one is a core

style heat exchanger so instead of a

wheel spinning and air going through it

in this case we have a metal heat

exchanger and the two air streams

crisscross with each other right

that guy slides out we have one air

stream going this way one of your stream

going that way we have two fans over

here one motor in between them driving

it so both fans are running at the same

speed no matter what so how much air

flow they move is a function of how much

duct work you have on each of those two

air streams but all the RVs whether it's

the one we just looked at or this one

will have four air pathways on them two

ends and two outs right so in this

particular case let's see which one's

which this is the outside air coming in

the top up here right

going through this way and then over to

the furnace and then we have air leaving

from the first going through that way

and exhausting out the building right so

the airflow path moves like that the

actual heat exchange surface we look at

it here it's a metal heat exchanger in

this case cuz it's the HRV only so it

doesn't do any moisture transfer and we

have a filter here and a filter here

these are not like super high quality

filters because they're not cleaning the

air in your house you have other filters

for that these guys job is just to keep

large debris off of the heat exchanger

surface area right but if I put my hands

through here or put them through on this

side over here my fingers would never be

able to touch each other because it's

two separate air flow paths and the air

is just warming up or cooling down the

plates in between if I have a one that

does moisture transfer it will either

have some kind of fibrous material in

here or some kind of polymer right so

this is not just metal this is obviously

a very small one you wouldn't have this

you know it's a demo sized one you

wouldn't have this in your house but in

this case the air can go through it on

both air flow paths and do the heat

transfer and then the fiber material

wicks the moisture through kind of like

wicking moisture through on a string or

a rope same kind of basic idea all right

let's run one now and see how that goes

this is our hands-on demo unit that we

use here in the training lab for our ERV

classes this is a nice one that's all

set up the plexiglass

so we can see inside it and was

graciously donated to us by the folks

over at air exchange and as you can see

it has a fully operational wheel in it

the small motor down on the bottom

driving that and we have two blower

motors on here one a motor here the

blower is an intake so it's sucking area

in the cabinet this way through the heat

exchanger and out the other blower over

here is sucking air from the building

through the heat exchanger and then out

of the building so we're gonna run this

guy I'm going to give it a few minutes

and a time-lapse here to speed it up so

you can see it heat up we have a small

heater down here in the bottom that's

gonna simulate a hot summer day for us

and we'll have to run it that way

[Music]

this guy's been running for a little

while now we got a hot summer day

stimulated we're 103 104 degrees air

coming in from outside so pretty much

the hottest day you get in any point of

the year and as you remember that

airflow is going straight through that

way and the clean air molecules are

going into the building

but the heat as you can see we're going

from 104 to 77 78 79 degrees something

like that so we're dropping the

temperature from 104 down to 78 degrees

on that air molecules moving in because

the heats not going that way with the

air heats going this way

taking a turn on the heat exchanger and

coming back out that way so 104 is going

in 96 is going out because the majority

of the heats going this way and only a

little bit of heats going in and then

the air leaving the building it's coming

out of the building at 77 picking up the

heat from that Airstream but not the air

mass it was just the heat and it's

leaving here at 96 so that's kind of how

it's saving heat taking this path like

that

the cool air if you will is taking that

full path like that but the actual clean

air molecules are going this way and the

dirty air molecules are going that way

hopefully that gives you an idea of how

ERV S&H RVs operates and what they look

like on the inside

see at the next video

 

Тема 4

GeneralAire® HRV & ERV - How to perform the maintenance

https://www.youtube.com/watch?v=h3AtOVtSy5I

we can take note of the four areas we

need to cover during our maintenance

area one are the two pre-filters area

two is the core area three is our sloped

drain pan and area four is our intake

and exhaust ports first thing we're

going to do is remove the pre filters

and the court to remove the pre-filters

we're going to simply pull them straight

out of the unit with the pre filters out

we can remove the core when we are

removing the core we have to be careful

and only pull on the four corners of the

chord

and with our core and pre-filters out we

can clearly see inside of our unit that

was a great time to check our slope to

drain pan for any buildup of dirt or

debris if we find any we can clean it

out with a mixture of water and vinegar

and a non-abrasive cloth while we're

cleaning we will also want to inspect

our intake and exhaust ports if we find

they need to Bri in there we will also

want to remove it to clean the pre

filters we are going to simply vacuum

the dirty side remember these filters

should be cleaned four times a year and

once a year be replaced with new ones

the last thing we are going to clean is

the cord this should be cleaned once a

year and at the end of the fifth year it

should be replaced there are maintenance

instructions for your future reference

located on the front of the core the

first thing we are going to do to clean

the cord is to vacuum all four sides

the last thing we're going to do with

our core is soak it in warm water with

mild soap for 15 minutes after that

we'll rinse it off and let it dry with

our core nice and dry we can put it back

in the unit to do this will line up all

the corners with their respected holders

and slide the core back into the unit

the core in we can replace the

pre-filters

with everything clean and back in place

we can shut the door

with the cover down we can now Reese now

both of the latches

if the cover snapped back into place we

can replace the power cord

and that's all it takes to perform the

maintenance on your HRV or year v system

again I'm art Redner with general air

reminding you to breathe healthier see

you next time

 

Тема 5

Mechanical ventilation with VENTIFLEX® PLUS system and Ground-Air Heat Exchanger

https://www.youtube.com/watch?v=VevJ4ShSsvE

we spend most of our lifetime in closed

rooms in the case of poor ventilation in

the rooms are comfortably even if we

often do not pay attention to that our

vitality and ability to concentrate may

be significantly impaired fatigue and

apathy are increasing mostly the reason

for this is our brain hypoxia

resulting from lack of fresh air we can

effectively prevent that by installing a

modern and energy-saving ventilation

system it will ensure constant access to

fresh air irrespective of the season and

whether the house presented here is

provided with inventive Lex mechanical

distribution ventilation systems that

cooperates with the ground firm ground

pipe heat exchanger fulfilling the

function of the ecological air

conditioner the above set reduces to

minimum the energy consumption needed

for heating or cooling fresh air that is

delivered to the building in summer the

hot air passes through the ground heat

exchanger and is cooled from

thirtysomething degrees Celsius to

approximately 18 and when distributed

inside the building it creates Pleasant

comfortable and healthy climate in it

even on the hottest of days the suitable

filters catch insects and just from the

supplied air the air supplied in this

way is free of excessive humidity which

significantly increases comfort even on

the hottest days at the same time the

air is not over dried as is the case

when the standard air conditioners are

used moreover a cool obtains this way it

is practically free it is supplied by

Mother Earth in winter before entering

the building the cold air is initially

heated in the ground heat exchanger

pipes to approximately zero degrees

Celsius or about

we obtained the additional preheat in

this way from the ground eat exchanger

the air is directed to the air handling

unit that is the heart of the entire

system it is in it we're owing to the

heat exchanger located there occurs heat

recovery from the waist and that is

discharged from the building interior in

this way the air entering the building

achieves nearly room temperature

in other words 18 to 20 degrees Celsius

it's further heating requires only very

low energy input this solution ensures

that we always have fresh air inside the

building without the need to open the

windows and with very low heating costs

moreover we get rid of mold on walls

that is a frequent problem occurring in

well insulated buildings with tight

windows and equipped only with the

natural ventilation that is typical of

insulation chimneys in the case of newly

built houses installation of the

mechanical ventilation system with heat

recovery is the condition necessary for

the building to be energy saving

functional and comfortable to ensure

correct operation of the ventilation

system it is necessary to correctly

distribute air inside the building it is

extremely easy to achieve that by using

the 20 flex modular system the system

consists of the main ducts with which

the air from the air handling unit is

supplied to the manifolds from there

using the vent effects flexible ducts

the air is distributed to individual

rooms via the plenum boxes connected

through the diffusers or ventilation

grills the vent I flex ducts are

equipped with the smooth anti-static

internal layer with an additional silver

agent to prevent the development of

funky molds and bacteria causing big

problems in any ventilation systems the

vent I flex system fittings protected

also with silver coating have the

modular construction using only 10 basic

elements you are able to construct

practically any type of man

default or cleaning boxes such a

versatile solution gives you a lot of

freedom in running the ducts inside the

building the venti flex ducts manifolds

and plenum boxes that supply air on the

ground floor can be located in the

extruded polystyrene insulation there

below the floor screed while the ones

that supply air on the first floor are

usually installed above a false ceiling

below the insulation layer small sizes

of the ducts cleaning boxes and

manifolds do not hinder in installing

the floor heating system and make it

possible to perform the aesthetic

ventilation system that is practically

invisible to the eye the correctly

designed 20 flex ventilation system is

efficient features low airflow

resistance and is practically noiseless

you may receive the correct design from

our designers or the company's

cooperating with us

 

Тема 6