Practicum 10.2 Refrigeration-1

AE310 Refrigeration/Heat Pumps Practicum 10.2 1. Exploring Vapor Compression Equipment: For each of the equipment variations below go to a manufacturer’s website (e.g., Trane, Carrier, Daikin, Mitsubishi, Multistack, York, etc.) and find an image of a specific product. On the image, add labels for 1) the source and use side, 2) the condenser, 3) the evaporator, 4) the compressor, and 5) the source of power for the compression. Also, label the medium (air, water, etc.) going into/out of the source and use sides. a. Water-cooled Centrifugal Chiller Manufacturer: Carrier Compressor Condenser (Source Side) Medium: water AKA Power for compressor Evaporator(Use Side) b. Water-cooled Screw Chiller Compressor Manufacturer: Carrier Condenser (Source Side) Medium: water AKA Power for compression Evaporator (Use Side) 1|Page c. Engine-driven Chiller Manufacturer: Tecochill Compressor Engine: where gas (medium) is inputted Condenser (Source side) Evaporator (use side) d. Steam-turbine Centrifugal Chiller Manufacturer: Johnson Controls Medium: Steam Power: Electricity Compressor Condenser (Source side) Evaporator (use side) e. Air-cooled Scroll Chiller 2|Page Manufacturer: York Condeser(Source side) Power: Electricity Medium: air Evaporator (Use side) Compressor f. Air-source Heat Pump (Commercial, >20 tons) Power: Electricity Evaporator(Source side) Compressor Medium: air Manufacturer: Mitsubishi Condenser(use side) g. Air-source Heat Pump (Residential, <10 tons) Condenser(use side) Manufacturer: Mitsubishi Compressor Power: Electricity Medium: air Evaporator(Source side) 3|Page h. Heat pump water heater Evaporator(Source side) Compressor Power: Electricity Medium: water Condenser(use side) Manufacturer: AO Smith i. Water-to-water heat pump Manufacturer: Heodoi Evaporator(Source side) Compressor Condenser(use side) Medium: water 4|Page Q = 30ton(12,000Btu/Hr Q = 360,000Btu/Hr 2. Water-cooled Chiller and Heat Rejection Calculations Trace the path of the room load from the return air to the outside air, listing the medium and the devices of a water-cooled chiller system. 1 Medium (air or water) Mixed Air 2 Chilled Water Device (coil, etc.) qtotal = 30 tons a. Cooling Coil b.Evaporator 3 GPMCHW = 360,000/(500*(52-42)) GPM_CHW = 72Gpm If chilled water changes from 42° to 52° qRE = 360,000 Btu/Hr Refrigerant c. Condenser If COPc = 4.0 W = 360000/4 = 90,000 qrej = q_ke +W qrej = 450,000 4 Condenser water d. Cooling tower 5 Outside air GPMCondW = 450,000/500(95-85) = 90Gpm If Cond Water changes from 95° to 85° Total Btuh rejected Q + W = 450,000Btu/Hr 5|Page