Variable Refrigeration Flow Systems Overview 10/11/2016
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1 Variable Refrigeration Flow Systems Overview 10/11/2016 Executed by
2 Data Power Technology Illinois Aggressively, relentlessly anticipating and exceeding our customer s and client s expectations every day, while always building trust.
3 Agenda What is VRF VRF Components Condensing Units Fan Coil Units Branch Selector Boxes Controllers Specialties Application overview Layouts Condensing Unit Options Ventilation Air Energy Efficiency and Savings
4 What is VRF Air conditioning on a dimmer switch DC inverter driven compressor with load matching software algorithm that varies the output to match multiple fan coil unit capacity demands. Pulse modulated electronic expansion valves control refrigerant flow through evaporator coil. Branch controller unit changes flow of refrigerant based on the demands of the space. Transfers energy through refrigerant allowing for heat recovery during simultaneous mode operation. Extremely efficient in part load conditions.
5 What is VRF? Heat Pump 2 Pipe All Heat or All Cool. Y branches Headers Heat Recovery 3 Pipe Heat or Cool. Y branches Branch selector boxes
6 Components Condensing Unit Single, Dual, Triple frame Air Cooled Water Cooled V 3Phase 460V 3Phase
7 Fan Coil Units Capacities from 0.5 to 8 Tons. Ducted. Non-Ducted. Ceiling, Wall, Floor mounting. Air Processing Ducted Units. Ventilation Air Single Phase.
8 Heat Pump System
9 Simultaneous Cooling Based
10 Simultaneous Heating Base
11 Branch Selector Boxes Single Circuit Box Multiple Circuit Box Home Run Multiple Circuit
12 Controls Local- Room Controllers. Central Controllers. Integration Devices. BACNet, Lon, Modbus. Digital input/output controllers. Dry Contacts. Economizer control. Occupancy sensors. Auxiliary heat control. Power consumption metering.
13 Specialties Special purpose fan coil units Water Heating/cooling. Domestic hot water (with 3 rd party HX tank). In Floor / sidewalk snow melt, radiator. 3 rd Party AHU Integration VRF Condensing unit connects to AHU coils providing capacity control. Part of VRF system or stand alone.
14 Application Overview Office Space 9,600 Sqft. 30 Zones. Office. Conference. Room. Individual zone control. Simultaneous heating and cooling.
15 RTU-VAV (5) Packaged RTU Gas Fired DX Cooling (30) VAV SCR Electric Heat
16 VRF Cassette (30) 4-Way Ceiling Cassette Ventilation Air required. Heat Recovery. Independent zone control.
17 Home Run Heat Recovery Centrally Located Branch Selector. Rigid ACR from CU to HR/BS box. Soft Copper Line Sets from HR/BS box to Fan Coil V 1Ph connections on HR/BS and IDU. BS/HR Condensate drainage needed.
18 Single Circuit Heat Recovery Zone located HR/BS boxes. Rigid ACR from CU to HR/BS box (3 Pipe).. Soft Copper Line Sets from HR/BS box to Fan Coil V 1Ph connections on HR/BS and IDU. BS/HR Condensate drainage NOT needed.
19 Multiple Circuit Heat Recovery Zone or Centrally Located HR/BS boxes. Rigid ACR from CU to HR/BS box. Soft Copper Line Sets from HR/BS box to Fan Coil V 1Ph connections on HR/BS and IDU. BS/HR Condensate drainage NOT needed.
20 Condensing Unit Options Air Cooled Ranges from -13 F to 65F heating mode. Cooling range from 14 F to 118 F. Cooling down to -9.9 F with low ambient kit. Capacity decreases in heating mode as outdoor ambient temperature drops below 14 F. Requires defrost. Can be placed in enclosure.
21 Outdoor Placement- Air Cooled Account for Snow Fall. Access for maintenance. Prevailing Winds.
22 Placement in enclosures Inlet and Outlet Louvers and Dampers with Bypass Damper System.
23 Water Cooled Condensing Unit EWT Ranges down to 23 F. Loss of nominal capacity with Glycol. Closed Loop Geothermal Open Loop HX Required Indoor Installation
24 Ventilation Air Refer to ASHRAE Standard Ventilation for acceptable indoor air quality. publications/bookstore/standards Ventilation air can be direct or decoupled from the VRF fan coil units. Examples of Ventilation air systems DOAS with an energy recovery wheel. DOAS with an energy recovery core. ERV/HRV. VRF outdoor air processing unit.
25 Energy Efficiency Measured in IEER. AHRI Standard with Addendum 2 Integrated Energy Efficiency Ratio Measured in EER, IEER, SCHE and COP for Heating. fhp/defaultsearch.aspx Elimination of duct losses estimated at 10-20% airflow in some systems Variable speed compressor spends most of it s time between 40-80% Estimated 30-35% savings in annual operation costs vs VAV systems
26 Questions Thank you! Steven Blanchard Data Power Technology Illinois 8105 N University St, Peoria, IL Sblanchard@DPTMechanical.com
27 Thank You References action ASHRAE Journal. April Variable Refrigerant Flow Systems, By William Goetzler _1230_2010_with_Add_2.pdf
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