Munters DOAS, Chilled Beams and VRV Scott McGinnis Regional Sales Manager LEED Associate March 7, 2011

Overview Chilled Beams and Variable Refrigerant Volume Systems Moisture Control Equipment

Why the Shift to Beams and VRV? 42” Duct 2” Pipe 5/8” Refrigerant Pipe – All move the same amount of energy.

Active Chilled Beams

Reasons For Chilled Beam

Reasons For Chilled Beam

Reasons For Chilled Beam

Variable Refrigerant Volume (or Flow) VRV Single outdoor unit Multiple indoor units Extra Long Piping runs Variable Capacity Modulation Indoor units fit zoning needs Low Noise Environment Architectural – (design & savings) Individual control Temperature set point Fan speed Mode (cool, dry, fan or heat) Complete variable capacity modulation, based on load requirement.

Central A/C System VRV System Cooling tower Outdoor unit Outdoor unit Pump Water piping Indoor unit Refrigerant piping VAV Boxes Valves Pump AHU Remote controller For cooling For heating

Perfect Team Chilled Beams must have DOAS Unit to Prime the System Chilled Beams are Sensible only devises, no latent capacity Chilled Beams run 58-60°F water thru pipes in each room, NO DRAIN PAN VRV Systems need DOAS Systems As in all DX systems, most efficient when only doing sensible cooling only VRV-ness of the system wants to unload when T-Stat is met

Calculating building moisture load is more important Size the DOAS to handle ALL the internal latent load Prevents chilled beams from sweating #1 fear of design engineers I have spoken with You make quell that fear with Munters Provides proper space %rh Allows VRV systems to operate at most efficient Prevents condensation within AHUs Mold grown Maintenance of wet coils, etc… Proper space %rh

Calculating building moisture load is more important

Typical Buildings & DOAS Designs (does not handle the indoor humidity load) Space Served Dew Point Control Meeting Space Single 51-55 F Loose Grocery Store 48-52 F Medium Pharmaceutical 49-56 F Tight Hotel / Condo. Multiple 54–56 F Office 52-55 F Classrooms Healthcare Depends 42-52 F

How dry does the OA need to be? ASHRAE shows how to calculate how DRY the OA needs to be in order to control space moisture If you want to maintain 75°F at 50%rh, then the space is at 55°F dewpoint You need to deliver air drier than 55°F dewpoint

Use the Correct OA Condition 106 gr/# 131 gr/#

Internal People Load vs Ventilation QL = 1 person = 200 btu/per Ventilation Required 15 CFM per Person Capacity What dewpoint air at 15 cfm will absorb all the moisture given off by a person sitting at rest?

Math Ventilation Air: 15 cfm x 30 students = 450 (6,000 + 3,050*) btuh = 450 x .68 x Delta Grains 9,050 = 306 x Delta Grains 9,050 / 306 = 30 gr/# Dewpoint of 450 cfm OA to achieve: 75°F/50% = 35°F 75°F/55% = 41°F 75°F/60% = 48°F Lower than the past The Munters Story Munters Products *3,050 = Simple Formula for infiltration for standard classroom

Conventional Options Coil Tonnage is large for lower dew points

What to offer with VRV systems Because VRV systems are already packaged DX, it makes sense to stick with that method DryCool DryCool ERV 3 Fan DryCool – ERV 1500 – 16,000 cfm capacities Determine Airflow and Delivered Gr/#

DryCool Standard No energy recovery Low dew points Retrofits and smaller projects

DryCool ERV Energy recovery Indoors without remote ACCU

The Hammer: 3 Fan DryCool ERV 75°F/40.3 dp 75°F/56 dp 81°F/61.5 dp 53°F/53 dp 7,000 cfm and 20 tons 93°F/68°F dp

Benefits of DryCool Control the space moisture, and thus %rh Allow VRV system to operate sensible only. Most cost efficient way to run Dry coils Dry drains May be able to downsize FCU or DX coil rows/fpi Decrease PD Decrease First Cost Reduce Refrigerant tons DryCool system offers highest EERs of any DOAS Reduced Operating costs

What to offer with chilled beams Chilled beams want 58-60°F water in the coils DOAS needs low dew point, Thus typically uses a coil with low chilled water temps; 42-45°F EWT Is there an advantage of using just 60°F water in the DOAS? 2x ? 42°F to DOAS 60°F to Chilled Beams

This 45gr/# delivered system requires a chilled water coil delivering 52.7°F dry bulb air: EWT = 45°F Why use 45°F water for this unit and 60°F for chilled beams?

Chiller Efficiency Big difference between 42°F water and 60°F water

Chiller Efficiency Big difference between 42°F water and 60°F water 42F Chiller 32% Lower operating cost 60F Chiller

How to use DryCool process to benefit? If possible, use the DryCool ERV or 3 Fan DryCool No need to run chilled water to the DOAS Delete Pumps, Piping, Piping Insulation and such to unit Down size chiller plants for just the chilled beams and keep them at 60°F water

Total tons: CW (56) + DX (84) + Post (13) = 153 tons 65°F/80Gr 60°F 82°F/80Gr 69/44Gr After E Wheel 56°F/61Gr Dry Air Total tons: CW (56) + DX (84) + Post (13) = 153 tons Semco was at 156 tons but required 45°F chilled water

Semco 182”w x 146”h x 448” L 37,000 cfm

Passive DH depends on what is uncontrolled Short tonnage if RA %rh is out of control 50% rh 60% rh

Plan of action for chilled beam or VRV Help calc latent loads People, infiltration, permeance Discuss that DOAS equipment should take care of entire latent load Sell DryCool process: We drive the moisture out of the DH wheel VRV, all packaged DX is similar, less energy Chilled beams Show benefits of one simple chiller plant with 58-60F water By using all package DX By using Hybrid of Chilled Water and DX with DryCool Use a standard product if possible Quicker selection Better price points Talk to factory about custom version to meet the engineers and owners needs Discharge air temps, control Layouts Plates vs. wheels, etc.

Point engineers to the fact that most of our competition is the baseline.