ᐅ Mechanical Ventilation with Heat Recovery (MVHR) by Helios – Is Installation According to Manufacturer’s Instructions Sufficient?
Created on: 25 Nov 2015 21:24
M
merlin83
Good evening,
we need to place an order for a mechanical ventilation system with heat recovery on short notice. Currently, we are considering a HOVAL HomeVent FR (300) from supplier Z and a Helios EC 500 W R.
The Helios EC 500 W R is priced at a gross EUR 12,575.00 minus discount, with an estimated final price of about EUR 11,500.
The Hoval HomeVent FR (300) is priced at EUR 15,670.00 minus discount, with an estimated final gross price of about EUR 14,200.
The Helios seller prepared the offer based on Helios company specifications. I am not yet sure how many reference installations they have completed and will inquire about this. The Hoval seller based their offer on many years of experience in ventilation system installation.
In my opinion, the Helios 500 is more powerful than the offered Hoval 300. It is questionable whether the demand and design calculation based on Helios factory data is sufficient. The Hoval seller stated that the manufacturer’s data is not sufficient and that their planning is perfect.
What are your experiences? How many installations should the Helios seller be able to demonstrate as expertise to ensure that the system will be installed and function smoothly and safely?
Thank you in advance.
Best regards,
merlin83
we need to place an order for a mechanical ventilation system with heat recovery on short notice. Currently, we are considering a HOVAL HomeVent FR (300) from supplier Z and a Helios EC 500 W R.
The Helios EC 500 W R is priced at a gross EUR 12,575.00 minus discount, with an estimated final price of about EUR 11,500.
The Hoval HomeVent FR (300) is priced at EUR 15,670.00 minus discount, with an estimated final gross price of about EUR 14,200.
The Helios seller prepared the offer based on Helios company specifications. I am not yet sure how many reference installations they have completed and will inquire about this. The Hoval seller based their offer on many years of experience in ventilation system installation.
In my opinion, the Helios 500 is more powerful than the offered Hoval 300. It is questionable whether the demand and design calculation based on Helios factory data is sufficient. The Hoval seller stated that the manufacturer’s data is not sufficient and that their planning is perfect.
What are your experiences? How many installations should the Helios seller be able to demonstrate as expertise to ensure that the system will be installed and function smoothly and safely?
Thank you in advance.
Best regards,
merlin83
merlin83 schrieb:
Another system... which Hoval is apparently supposed to master best.LOL, that's really the joke of the day...
SirSydom schrieb:
Does the Hoval have a rotary heat exchanger?
Are you obligated to use a specific contractor because of a general contractor agreement or something?GSirSydom schrieb:
Does the Hoval have a rotary heat exchanger?
Are you obligated to use a specific contractor because of a general contractor agreement or something?Exactly, a rotary heat exchanger. I am not bound to any contractor and can choose freely.Plate Heat Exchanger (Crossflow Heat Exchanger, Counterflow Heat Exchanger)
In all plate heat exchangers, air passes through a package of parallel, thin plates (alternating layers of supply air and exhaust air). Heat is transferred from the warm air to the cold air through the thermally conductive plates.
+ No moving parts, low maintenance
+ Simple design
+ Complete separation of supply air and exhaust air, no mixing
- Frost protection measures must be taken (e.g., electric supply air preheating or ground heat exchanger), otherwise condensate can cause icing
Rotary Heat Exchanger:
This technology uses a rotor made up of numerous channels running parallel to the axis of rotation (looking similar to corrugated cardboard, but made of corrosion-resistant thin metal or foil). Each channel is as long as the rotor is thick. One half of the rotor (e.g., the top) is passed through by the exhaust air, while the other half (e.g., the bottom) is passed through by the supply air in the opposite direction. The part of the rotor exposed to the exhaust air absorbs its heat and then rotates into the cold supply air. Thus, each channel is heated during half a rotation and releases this heat during the other half.
+ Moisture condenses on the cold rotor and is then reabsorbed by the supply air, reducing problems with overly dry air (humidification of the air)
+ No frost protection measures needed
+ Suitable for large air volumes
+ Requires a drive motor and seals, so potentially somewhat more prone to malfunctions than plate heat exchangers
- Additional energy needed for the drive motor
- Theoretically, microbial growth in the rotor and therefore in the supply air is possible, as well as slight air mixing with odor transfer (up to 30%!!!!)
Personally, I would not want a rotary heat exchanger... and what exactly can Hoval do better?
In all plate heat exchangers, air passes through a package of parallel, thin plates (alternating layers of supply air and exhaust air). Heat is transferred from the warm air to the cold air through the thermally conductive plates.
+ No moving parts, low maintenance
+ Simple design
+ Complete separation of supply air and exhaust air, no mixing
- Frost protection measures must be taken (e.g., electric supply air preheating or ground heat exchanger), otherwise condensate can cause icing
Rotary Heat Exchanger:
This technology uses a rotor made up of numerous channels running parallel to the axis of rotation (looking similar to corrugated cardboard, but made of corrosion-resistant thin metal or foil). Each channel is as long as the rotor is thick. One half of the rotor (e.g., the top) is passed through by the exhaust air, while the other half (e.g., the bottom) is passed through by the supply air in the opposite direction. The part of the rotor exposed to the exhaust air absorbs its heat and then rotates into the cold supply air. Thus, each channel is heated during half a rotation and releases this heat during the other half.
+ Moisture condenses on the cold rotor and is then reabsorbed by the supply air, reducing problems with overly dry air (humidification of the air)
+ No frost protection measures needed
+ Suitable for large air volumes
+ Requires a drive motor and seals, so potentially somewhat more prone to malfunctions than plate heat exchangers
- Additional energy needed for the drive motor
- Theoretically, microbial growth in the rotor and therefore in the supply air is possible, as well as slight air mixing with odor transfer (up to 30%!!!!)
Personally, I would not want a rotary heat exchanger... and what exactly can Hoval do better?
I have now chosen the Hoval system. The ventilation installer recommends this device after having installed many others. Price: EUR 14,700 for approximately 265m² (2,850 sq ft) of ventilated space, with a digital control panel in the living room. Looking forward to getting started.
Reason: Trust in the building services engineer
Reason: Trust in the building services engineer
It’s good that you trust him—that’s how it should be. However, I believe a 300 cubic meter system is too small for the size of your house, as I mentioned earlier.
I have just under 150 square meters (1,615 square feet) and a 300 cubic meter system, and sometimes I wish I had a larger setup...
I have just under 150 square meters (1,615 square feet) and a 300 cubic meter system, and sometimes I wish I had a larger setup...
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