
Qualche informazione sul gas refrigerante R32
Il nuovo regolamento europeo 517/2014 ha sostanzialmente ripreso il precedente regolamento 842/2006, ma ha differenza di questo ha spinto in maniera molto significativa verso un maggior controllo sull’utilizzo dei gas fluorurati, spingendo in particolar maniera verso l’introduzione di nuovi gas a minor impatto sull’ambiente.
Per raggiungere tale obiettivo il regolamento indica, già in fase di formazione degli operatori, l’inserimento all’interno dei corsi per il conseguimento della qualifica, di informazioni pertinenti alle tecnologie che consentano di sostituire i gas fluorurati a effetto serra o di ridurne l’uso.
Il cammino verso refrigeranti alternativi è già iniziato ed il futuro sarà sicuramente tracciato da refrigeranti HFO caratterizzati da bassissimi valori o quasi nulli di GWP (potenziale di riscaldamento globale), questi gas aiuteranno il “phase-out” introdotto con il regolamento n.517/2014, ma ad oggi non sono ancora maturi per quanto riguarda performance e per la leggera infiammabilità che li caratterizza.
Il presente invece è rappresentato da gas fluorurati a basso valore di GWP, come il Gas R32 che si inizia a trovare all’interno di alcuni apparecchi di refrigerazione destinata al residenziale.
L’aspetto più rilevante del gas R32 è il suo valore di GWP, pari a 675, che permette di realizzare impianti contenenti fino a 7 Kg di gas senza superare la soglia che obbliga a controllo delle perdite, tenuta del registro dell’apparecchiatura, e dichiarazione annuale all’ISPRA, soglia che per un gas R410 è già sorpassata da 2,4 Kg di gas.
Di contro il gas R32 è classificato come gas leggermente infiammabile, la sua bassa classe di infiammabilità non lo fa ricadere all’interno degli obblighi del Dlgs 35/2010, e pertanto può essere trasportato con le analoghe precauzioni che caratterizzavano il trasporto del gas R410, mostra invece qualche problema a livello di stoccaggio in magazzino, ma le precauzioni devono essere prese solo per ingenti quantità di gas, si stima che fino ad una cinquantina di macchine dualsplit non devono essere adottate particolari precauzioni e possono essere stoccate in qualsiasi luogo (il valore è puramente indicativo e da valutare da caso a caso).
Come anche per altri gas destinati alla refrigerazione devono essere rispettati i minimi dimensionali dei locali di installazione, ma non si discostano di molto rispetto alle dimensioni minime necessarie per altri gas fluorurati, potremmo quindi affermare che con qualche accortezza questo “nuovo” gas riuscirà a supplire a gas dotati di alto GWP.
Un ultimo aspetto da non trascurare è la parte relativa all’installazione e manutenzione delle apparecchiature che contengono questo gas R32, questo è pur sempre un gas fluorurato e segue tutte le indicazioni contenute nel regolamento europeo n. 517/2014, quindi per la predisposizione e l’installazione degli impianti che lo contengono l’operatore deve essere in possesso del patentino personale F-Gas e la ditta deve essere in possesso della certificazione aziendale.
A livello di attrezzatura, dovrà essere fatta attenzione che l’unità di recupero e alla bombola siano adatte all’uso con gas refrigeranti infiammabili, il cerca fughe elettronico dovrà essere in grado di rilevare il gas R32, e i manometri analogici dovranno con molta probabilità essere sostituiti, mentre i manometri digitali probabilmente, se di recente costruzione, saranno già idonei per questo nuovo gas.
E’ doveroso precisare che il manometro misura una pressione, ed essendo la pressione di lavoro del gas R32 simile alla pressione di lavoro di altri gas più comuni, si potrà continuare ad utilizzare anche manometti analogici per gas R410 o R407, purchè sia eseguito il ricalcolo manuale delle temperature, consentendo così di non dover sostituire lo strumento.
7 Comments
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I don’t think the title of your article matches the content lol. Just kidding, mainly because I had some doubts after reading the article.
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To select a super weight, familiarise your self
with the RPE scale (rate of perceived exertion). This is a scale from one-to-10, 10
being maximum exertion, one being minimal exertion. For energy and muscle achieve,
towards the end of your incline dumbbell press units, ideally you wish to be
sitting at round an eight out of 10. This means that at a push you would full two more reps at the finish of the set along with your
weight of selection. However, this feels simpler as a result of it’s not stimulating the chest, and may really create a risk of injury.
“To maximise chest activation, you need your arm path to line up in the identical path that the chest fibres run,” says Ethier.
So, embrace the decline hammer-grip dumbbell bench press
in your chest routine for great results. If you may be looking for a more superior variation to stimulate completely different muscle fibers within the chest,
then try the dumbbell decline hammer press. You could make it extra troublesome by utilizing heavier
weights. The decline dumbbell bench press can also
be simple to learn and progressively overloaded, so it’s utilized
by a newbie or an advanced lifter. Think About combining this press with workout routines like push-ups, bench presses, and chest flies for a complete chest
workout. This basic compound movement harnesses a barbell to target the upper chest region.
The bench press can be nice for improving bone density.
This may be essential for women as they age, particularly if
they’re concerned about osteoporosis. These are the muscular tissues you have
to get up off the ground, carry things overhead, and throw issues.
Before you start, pull your shoulder blades down and together,
and hold them as tight as you can all through the entire
train. Dumbbell presses also can enhance the general power,
power, and pace of many types of athletes.
That’s also why Squatting 140kg/300lb is simpler than Benching the identical weight.
Forget about this tip if you’re new at Bench Pressing.
Novices shouldn’t maintain their breath for reps. They can’t anyway.
Still, in case you have sore shoulders from benching, it
might be value a strive. Benching from the floor may give your shoulders the
steadiness they’ve been craving. If you’re at the fitness center,
you possibly can undoubtedly use a spotter. Most individuals are prepared to help and honoured to be requested.
That stated, not everybody knows the method to spot well.
Some folks will instantly jump in and seize the bar when you’re doing just fantastic.
One purpose why the dumbbell bench press is so great for building muscle is that it allows for a wide variety of motion. However you will
not be able to get pleasure from this profit if you sell your
self brief and don’t lower the dumbbells far enough.
Most individuals ought to lower the dumbbells till they’re just above their chest.
Prepared to add the dumbbell bench press to your fitness
routine? Make positive you get the all-clear out of your doctor when you’re
testing a exercise regimen for the very first time or when you have blood stress
issues, says Henry.
If you miss the uprights, your elbows will be bent in a pullover-like position.
You’ll battle to hold the bar, could drop it on your face and
die. Always lockout the bar over you shoulders first.
Then transfer the bar back in opposition to the Energy Rack.
Don’t keep them bent to keep pressure or feel your muscles extra.
You may drop the bar in your face and die.
Some powerlifters do that to Bench Press heavier weights.
Some also think about overarching dishonest because it decreases
the range of motion an excessive quantity of.
You’ll lose upper-back tightness, your chest
will collapse and your palms shall be larger.
The seated dumbbell press pushes the weights up and puts a wholesome strain on the muscle tissue.
A seated dumbbell press is a compound weightlifting exercise that
targets the shoulder muscular tissues and is also a
variation of the navy dumbbell press. The advantages of
sitting while doing this train are a greater give consideration to the chest and shoulder muscle tissue and an emphasis on overall form.
The decline hammer-grip dumbbell bench press is a compound
exercise primarily focusing on the lower chest.
Nonetheless, the triceps and shoulders are secondary movers through the exercise and receive heavy stimulation. Hold challenging your
self, give consideration to proper form, and take heed to your physique.
You’ll impinge your shoulders if your upper-arms are perpendicular
to your torso on the bottom. Tuck your elbows 75° to Bench Press pain-free.
If you’ve any questions concerning the dumbbell bench press train or any of the variations
listed within the last section, please feel free to depart a comment beneath.
Some could decide to experiment with grip to determine how they will finest target
the muscle tissue of the chest. Some may decide they like rotating
the arm in the course of the press to include multiple grips at different positions of the exercise.
These are both variations we’ll list in the
variation part under that you can look into. You’ll need to
elevate the outer half of the dumbbell to create
a tighter press angle and get extra elbow flexion and extension.
This portion of the exercise is potentially dangerous, and heavyweight must be accomplished with the help of a spotter.
Decrease the dumbbells till they are barely under chest level.
Your shoulder bladers ought to keep flexed and pulled down towards the hips, and your again ought to have a slight arch.
Select a set of dumbbells of an applicable weight and a bench.
Final however not least, let’s discuss tempo or how rapidly you move the barbell during the Bench Press.
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Your neck will hurt when you push your head into the bench whenever you
press. Tighten your neck muscle tissue without pushing your head into
the bench. The easiest way to do this is by maintaining your head off the bench.
Your neck muscles might be tight if your head is off the bench.
If you’re over-cautious, you’ll Bench at lower intensities.
But you have to Bench heavy to extend your Bench Press.
Power Racks provide the security and confidence to Bench heavy.
The roll of shame is like failing the Bench Press in the Power Rack, however without one.
Situp on the bench and rise up with the bar as if Deadlifting.
Not that shameful but folks often suppose failing is, thus
“roll of shame”. The roll of shame might help you get unstuck should
you fail the Bench Press with out power rack or spotter
that can assist you.
Another great thing about barbell bench press is you can increase in smaller increments.
You might add as little as 1.25lbs to each facet, which is actually 1.25lbs per facet.
With dumbbells, the smallest increment shall be 5lbs if
you get to the heavier sizes. That mentioned, it should be famous that having a 90˚ angle (elbow instantly according to the barbell) or your elbows tucked is ok, it’s just totally different.
Typically, individuals will be the strongest with their
arms at 45 levels as a outcome of they recruit the primary movers
extra evenly.
Your elbows should stay at a 45-degree angle, and your arms shouldn’t shake as you
decrease the burden. Take a seat on the bench and firmly grasp the dumbbells.
Raise the dumbbells from the ground to your knees.
Once you are comfy together with your grip strength on the dumbbells, kick each dumbbell as a lot
as your shoulders and lay again on the bench. Your arms must be absolutely extended, and
the dumbbells ought to be over your chest. Do this for each repetition and when it’s time to
rack the bar, let your arms return, interact the
barbell rack, and land it straight back down. If you’re grabbing
the bar and there’s no bend in your elbows, the catch
on the barbell rack is too high.
This means the anatomy of the wrist is very sophisticated because it must be flexible in order to sustain and execute a variety of hand
movements. The decline press with a pair of dumbbells
is much more helpful. You work by way of a barely longer vary
of movement, which forces either side of your body to work independently.
The overload potential is spectacular, and you can evenly emphasize each pectorals
without the danger of developing side-to-side
imbalances. Utilizing a neutral grip is a safe alternative to the pronated grip decline dumbbell press, as it protects the shoulder joints, which
is a superb benefit.
It additionally works the anterior deltoid (front portion of the shoulder)
and the triceps (backside of your arm). When performed
correctly, it must be a full-body motion using the small muscular tissues in your shoulders,
large muscular tissues in your again, your core and even your glutes.
The alternating dumbbell bench press entails pressing one dumbbell
at a time whereas maintaining the opposite dumbbell
in the starting place. This variation engages your stabilizer muscular tissues and
can help improve overall stability and coordination.
To progress safely and successfully, goal to increase the load by 5-10% when you
possibly can complete 12 repetitions with proper type.
Getting to the point where you’re urgent plenty of weight can even pack on muscle in your triceps and shoulders.
The bench press is a foundational upper-body train used by
bodybuilders, athletes, powerlifters, and health lovers
alike. It has several variations, just like the incline dumbbell press.
Most individuals will inform you to modify exercise to extend your Bench Press.
To do Pushups, Dumbbell Bench, Close Grip Bench Press, Dips and so on.
Whereas these workouts will strengthen the muscle tissue you use on the Bench Press, they don’t
practice the movement. It’s like trying to turn out to be better at violin by taking part in guitar.
It doesn’t matter if they’re both string devices.
Pushups are a fantastic exercise but they’re not a substitute for a heavy Bench Press.
You can’t use a dip belt like on Dips and Pullups.
References:
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