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compare a conventional low velocity ducted system to a small duct high velocity system matched to
the same outdoor condensing unit. For this
example, the outdoor condenser is a 5-ton and the duct work is installed in the
attic. The building heat load is 40,000 BTUH.
Small Duct High Velocity System:The system is rated at 49,000 Btu/hr at 11 SEER. Small duct efficiency is 85%. The equipment load is 47,000 Btu/hr (= 40,000 ÷ 0.85).
The Small Duct High Velocity system is more efficient! Plus, if the ducts are inside the conditioned space, you can downsize the condenser and save even more, up to 20%.
|SpacePak and Hi-Velocity Mini-Duct(2 inch) High Velocity cooling and heating systems are our specialty here and have been
for over 20 years. So, trust us to quickly and accurately design your
new high velocity system for you. Most of our clients are surprised to
learn this technology has been around since the 1970's and only recently
found out about it by watching "This Old House". These systems are
finally getting the publicity they deserve since they outshine
conventional systems in many ways. In this picture on the right is one of the insulated 2" supply tubes with the white outlet attached, soon to be flush in the ceiling.|
|They are easier to install than conventional in both classic homes with no previous AC as well as new construction. We have had countless end users doing self contracting tell us how surprised they were at the ease of installation. These systems also are superior at humidity reduction pulling out 35% more moisture than conventional systems, so the air feels a lot more comfortable. The biggest benefit is that from floor to ceiling and room to room the temperatures are equal. We can also design your system to have up to 4 zones in case you want different areas at different temperatures. There are a few different types of systems we can do with SpacePak and Hi-Velocity. Here are some examples:|
- Cooling Only with a conventional outdoor AC condenser
- Cooling Only using an air cooled water chiller
- Cooling Only using a geothermal heat pump
- Heating Only using electric heat module
- Heating Only using a gas, oil, or wood fired water boiler
- Heating Only using a conventional heat pump (with or without back-up electric heat)
- Heating Only using a reverse cycle heat pump chiller
- Heating Only using a geothermal heat pump
- Cooling and Heating using a conventional AC condenser and Electric Heat Module
- Cooling and Heating using a conventional heat pump with optional back-up Electric Heat Module
- Cooling and Heating using a reverse cycle heat pump chiller
- Cooling and Heating using a geothermal heat pump
- Cooling and Heating using a conventional AC condenser and Hot Water Heat provided by a gas, oil or wood fired water boiler. Some of our clients already have a boiler for their radiant in-floor heating system. Those systems are awesome, but they take awhile to warm up. By adding a hot water coil on to your system, you can use your current(or new) boiler to provide fast forced air heat from the high velocity system too.
system is right for you? Well the main differences are in the air
handler types and the way connections are made in the system. Both
systems use the same size 2" supply tubing and 2" outlets(Hi-Velocity has an optional 3"). SpacePak systems can be zoned in to as many as 3 zones if
desired and Hi-Velocity can be up to 4 zones(we have done up to 12 zones on Hi-Velocity using chilled water). Both offer chilled/heated water versions of their air handlers
for use with a chiller or geothermal system. Both systems can use the
optional slotted outlets. If you are wanting to use zoning then definitely check out the Hi-Velocity brand with their easy to add on 2-4 zone kit and automatic real-time plenum pressure monitor and regulator.|
SpacePak uses a single piece air handler and an ECM variable speed blower motor. 230 volts is stock, but they can be modified to use 115 volts instead. SpacePak connections are all made using their kwik-connect twist and lock fittings. SpacePak uses either a 10"x10" square fiberboard plenum, or a 9" round sheet metal for all sizes of their systems. Optional electric duct heater, as well as optional hot water heat coil module.
Click Here To See Typical Square Plenum System Layout Of Pieces
Click Here To See Typical Round Sheet Metal Plenum Layout Of Pieces
If you aren't interested in the VFD and pressure monitoring models, they do offer some standard 1-speed PSC motors as well.
Hi-Velocity has their own optional integral zoning system that attaches to the front of the air handler and includes the dampers and plenum collars, so it makes it very easy to zone in 2, 3, or 4 zones right at the air handler. Working with their VFD and pressure sensors the airflow is monitored and the blower speed controlled to match the needs of however many zones are needing cooling or heating.
Hi-Velocity also has the most advanced optional air purification system available. It features MERV 13 filters, Ultraviolet light purification with 0 ozone production, as well as a Titanium Honeycomb air purification module which never needs cleaning or replacing for removing odors and toxins in the air.
Hi-velocity doesn't manufacturer their own plenums, return air ducts, or return air/filter/grilles. So, that leaves us free to use common off-the-shelf round sheet metal for plenums. Regular insulated flex duct for return air ducts and standard size return air/filter/grille boxes. This saves a lot of money on material.
Hi-Velocity offers a 3-ton and 5-ton inverter variable speed compressor heat pump, which when coupled with their VFD blower motors and/or zoning equipment will be able to offer unmatched comfort and energy savings with the ability to precisely control different areas of the building.
The main things we need from you to get started on doing system engineering like the image above and determining what equipment you will need are a floor plan(hand drawn or CADD or Blue Prints) and to fill out our engineering form. We will provide you with an equipment list and outlet per room guide and layout if desired. Our engineer will do the heat load and/or heat loss calculations and custom design your SpacePak or Hi-Velocity high velocity AC system free of charge. Then, we send you the equipment list that you would need for the project. After we get the list to your liking, we can sell you the equipment and ship it to the job site. We do it all here. We just need the information on the list below, so that our engineer can to get to work for you!