1. HEAT RECOVERY VENTILATION MAKING MONEY WITH SMALL COMMERCIAL RETROFITS
RE-ENGINEERED
MAKING MONEY WITH SMALL COMMERCIAL RETROFITS
AHR 2017
Las Vegas, Nevada

2. EXISTING RTUs – THEY’RE
EVERYWHERE!
AGING INSTALLATIONS
Many aging gas packs
Possible curb reuse
Typical energy savings w/replacement 5%
© Ventacity Systems, Inc.

3. REPLACING PACKAGED ROOFTOP UNITS WITH HRV + VRF!
Remove aging RTUs
Replace some with VS1000 RTs
Repurpose ducts, possibly
Install DMS/VRF for heating/cooling
THE PARADIGM SHIFT
© Ventacity Systems, Inc.

4. COMPARISON OF RTU REPLACEMENT VS HRV/HP UPGRADE
Energy
Maintenance
Life Span
Equipment sizing
Comfort
IAQ
Attractive Payback!
Very Low Energy Savings
(5% Typical)
Same High Cost Maintenance
15 Year Life Span
Same H/C Loads,
Resulting in 1:1 Replacement
Same Noise Level
Same poor IAQ
Significant Energy Savings(Proven %)
50% + Reduction In
Maintenance Costs
25-30 Year Life Span
Significant Reduction in
H/C Loads, Reduced
Equipment Sizing
Improved Comfort & Quiet
Great IAQ & Health
© Ventacity Systems, Inc.

5. VENTACITY VS1000 RT + VRF PILOT PROJECT #1
9 Rooftop packaged units; 47 tons of cooling
Replaced with 4 VS1000 RTs and a 16-ton Mitsubishi VRF System
Recent observation:
101 oF on roof, system maintained set point (71F)
VRF AT ~75 % capacity
47  13 KBTU/SQFT projected EUI
Tenant/owner HAPPY!
© Ventacity Systems, Inc.

6. ENERGY Consulting Firm
installation FACTS
Privately owned office
Five story building circa 1909
17,162 sq. ft. conditioned area
Pre-conversion HVAC—One 35 Ton RTU serving all floors
Post-conversion HVAC—One VS1000 RT, one Mitsubishi Citi- Multi 14 ton VRF, zone by zone ¾ ton to 2-ton heads
All-new ducting was installed with a common plenum CO2 sensor providing direct feedback to the VS1000 RT for demand-controlled ventilation. A Mitsubishi City-Multi 14 Ton VRF outdoor unit with zone by zone ¾-ton to 2-ton heads, was installed to satisfy the heating and cooling load. 
kBTU/ft2/year
64% lower
© Ventacity Systems, Inc.

7. Electric co-op installation FACTS Electric cooperative offices
Single story building built in 1938
5,681 sq. ft. conditioned area
Pre-conversion HVAC—2-stage kBtu/hr electric boilers serving fan coils & radiators; packaged HP RTU; 2 swamp coolers for storage/garage area
Post-conversion HVAC—One VS RT working with two Mitsibishi multi zone DHP, four DMS, two 24,000 BTU AHU, and one electric boiler back-up
Early monitoring results shown below show a noticeable “step down” in CO2 concentrations immediately. During the first two weeks, CO2 was almost always between 400ppm and 600ppm, with one peak of 810ppm. Pre-conversion, there were regular spikes in all areas well above 1000ppm.
© Ventacity Systems, Inc.

8. Law office installation FACTS Privately owned law office
Two story building built in 1909
12,000 sq. ft. conditioned area
Pre-conversion HVAC—9 RTU’s
Post-conversion HVAC—Four VS1000 RT, One Mitsubishi VRF heat pump, eight Mitsubishi Ducted AHU
kBTU/ft2/year
71% lower
By upgrading lights, windows, and air-tightness, the office’s overall EUI is expected to drop by over half, from 61.4 to 28 kBtu/ft2/year. HVAC EUI, in particular, is expected to drop from 47 to 13.5 kBtu/ft2/year, a 71% reduction.
© Ventacity Systems, Inc.

9. Law office’s savings skyrocket
The first quarter of monitored energy usage indicates the Ventacity system outperformed predictions, even when summer average temps were above norms.
© Ventacity Systems, Inc.

10. THANK YOU, from all of us at www.Ventacity.com!
888-VENTIL-8 x7337