In Search of the Magic Box: A Review of Crossover Conditioning/Ventilation/ Dehumidification Devices on the US Market
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1 In Search of the Magic Box: A Review of Crossover Conditioning/Ventilation/ Dehumidification Devices on the US Market Eric Urban Senior Energy Data Analyst Staengl Enginering
2 Definition Crossover Device: Machine that handle space conditioning, ventilation, and dehumidification (and maybe water heating) in a single package
3 Nilan Compact P Zehnder Daikin Drexel und Weiss
4 ??
5 ??
6 REALIZE RMI catalyzing the development of a speedy and scalable process for zero-carbon residential retrofits + REALIZE is currently seeking an integrated set of mechanical systems for the retrofit pilot. RetrofitNY NYSERDA aggressively working to help create new solutions to renovate multifamily buildings
7 Energiesprong energy pod example Heat pump for space conditioning and DHW ERV PV inverter DHW tank
8 Crossover Device Description Ventilation Mode Recirculation Mode w/ compressor Recirculation Mode w/o compressor
9 Crossover Device Description Cooling Heating Ventilation Mode Recirculation Mode
10 Device Details Unique features Features in common Minotair Pentacare-V12 Build Equinox CERV2 Heating capacity (Btu/h) (recirc), 6631 (vent) Cooling capacity (Btu/h) (recirc), 5314 (vent) Sensible cooling capacity (Btu/h) (recirc), 3891 (vent) Nominal heating efficiency (COP), 1 recirculation mode Nominal cooling efficiency (COP), 2 recirculation mode Nominal heating efficiency (COP), ventilation mode? 4.90 Nominal cooling efficiency (COP), ventilation mode? 7.60 Dehumidification (Liters/day) (recirc), 14.9 (vent) Compressor speed constant variable Max fresh air flow rate (cfm) Max recirculation air flow rate (cfm) Fan power (total for 2 fans) (W) 116 (180 cfm), 136 W (250 cfm) 66 (180 cfm), 150 (250 cfm) Compressor power (W) (recirc), 204 (vent) Filtration MERV 15 HEPA 2x MERV 13 Maximum static pressure (inches) "SP at 150 cfm Connection orientation vertical vertical Dimensional orientation horizontal vertical System dimensional volume (ft3) System dimensional footprint (ft2) 9 7 Heat recovery core Modes Dehumidification Pollutants detected and controlled Fans Free cooling mode Optional auxiliary duct heater Warranty 1 at 47 F 2 at 95 DB / 75 WB outside, 80 DB / 67 WB inside 3 Assuming 250 cfm and 50 F supply active heat pump alternating ventilation and recirculation yes CO2, VOCs 2 ECM type yes up to 5 kw electric resistance 5 years
11 Methodology Overview 1. Calculate hourly heating and cooling loads for a representative apartment 2. Assume the device to have an HRV/ERV efficiency of 0.75 and determine the associated fan and compressor energy 3. Calculate fan and compressor energy to meet the hourly load. 4. Sum these values over the year to calculate the average heating COP and cooling COP. 5. Calculate the average annual W/cfm (fan power plus compressor power divided by cfm of OA that is equivalent to the required constant OA rate).
12 Representative Apartment Construction types & space details 1,032 ft 2 North and west exposures 2 bedrooms 1 bathroom 3 occupants 0.05 ach (at atmospheric pressure) N Windows: U-0.20 SHGC 0.30 Walls: R-31 lightweight
13 Representative Apartment Representative Unit Apartment Unit daily schedules & peak loads Peak electricity consumption (Btu/h) Peak sensible heat gain (Btu/h) Peak latent heat gain (Btu/h) Lights Miscellaneous Refrigerator Oven/Range Dishwasher
14 Green Bay Helena San Francisco Mobile Tucson Albuquerque
15 Green Bay Helena San Francisco Mobile Tucson Albuquerque
16 Total Annual COP
17 Total Annual Energy Consumption
18 Results Location ASHRAE Climate Zone 6B - Cold Dry 6A - Cold Humid 4B - Mixed Dry 2B - Hot Dry 2A - Hot Humid 3C - Warm Marine Device Minotair Pentacare- V12 WUFI Passive Entry and Annual Efficiency Helena, MT Green Bay, WI Albuquerque, NM Tucson, AZ Mobile, AL San Francisco, CA Electric efficiency [W/cfm] Annual heating coefficient of performance (COP) no heating required Annual cooling COP Combined Annual Heating COP Combined Annual Cooling COP Electric efficiency [W/cfm] Build Equinox CERV2 Annual heating coefficient of performance (COP) no heating required Annual cooling COP** Combined Annual Heating COP Combined Annual Cooling COP Electric efficiency [W/cfm] Baseline: ERV + Mini-Split Annual heating coefficient of performance (COP) no heating required Annual cooling COP Combined Annual Heating COP Combined Annual Cooling COP **% cooling load not met by CERV2 3.1% 4.8% 5.2% 12% 9.0% 0.27%
19 ERV Indoor unit Dehumidifier Outdoor unit System integration and CO2 control
20 1. Ability to provide cooling or heating in ventilation mode beyond bringing the supplied fresh air to the 75% effectiveness supply temperature that was arbitrarily assumed for comparison s sake Limitations 2. The COP values in the Results section also do not include the benefits from free cooling 3. The calculation assumes a constant (on/off) airflow rate during recirculation mode 4. The calculation does not account for CO2-controlled ventilation. Important Note: This analysis was done based on a combination of manufacturer-provided data (when available), publiclyavailable data (e.g., brochures, websites), and numerous assumptions. The results of this study represent neither actual performance of the devices nor theoretical performance of the devices. Rather, they represent only a comparison of the devices based on a large set of assumptions and using a methodology that, while not reflecting accurately the actual operation or energy consumption of the devices, allows for some measure of comparison in the WUFI Passive tool.
21 Fan Power as a Function of Air Flow Rate 250 cfm 135 cfm CERV2
22 à Take Control
23 à Take Control
24 Vermod CERV Report 13 CERV Homes in Vermont: Keeping Occupants Healthy, Comfortable and Energy Efficient The 13 Vermod-CERV homes have an annual occupancy energy usage of 3650 kwh/person. HVAC in the Vermod study: CERV, 1-ton cold climate heat pump, heat pump water heater
25 Next Steps Analyze the upfront and lifecycle cost, including operating costs, of each option accounting for all equipment needed to heat, cool, and manage humidity. Convince someone to make our pie in the sky a reality.
26 Pie in the Sky Ability to ventilate, exhaust, heat, cool, dehumidify, and generate hot water Passive ERV core Heat pump for additional heat recovery, domestic water heating, dehumidification, and reheat (if required) High COP, variable speed compressor and good fan power curve Natural refrigerant Good low-temperature performance Adequate capacity to handle all heating, cooling, and water heating loads Capable of continuous exhaust
27 Ques&ons?
28 Resources Weather Files USA_MT_Helena.Rgnl.AP _TMY3 USA_WI_Green.Bay _TMY2 USA_NM_Albuquerque.Intl.AP _TMY3 USA_AZ_Tucson.Intl.AP _TMY3 USA_AL_Mobile-Downtown.AP _TMY3 USA_CA_San.Francisco.Intl.AP _TMY3 Websites
29 Baseline Case: ERV + Mini-split Assumed indoor unit fan power: 135 W Assumed ERV efficiency: 0.85 W/cfm Hypothetical mini-split performance used in calculations: Assumed indoor conditions: Heating 68 F Cooling 77 F dry bulb 50% RH 5 Coefficient of Performance (COP) Capacity (Btu/h) Outdoor Drybulb Temperature (F) Heating COP Cooling COP Heating Capacity Cooling Capacity COPs exclude fan energy
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