WESTPOINT Commercial Air conditioners INVERTER VRF COMMERCIAL A/C Contents 1 2 What’s WMV & VRF? Residential central air AC 3 WMV energy consumption analysis 4 Digital scroll VS Inverter Part ⅠGMV & VRF Review of VRF(VRV) Variable Refrigerant Flow Developing from traditional split type air conditioner. Consist of outdoor units, indoor units, Refnet, controller etc. One outdoor unit can drive at least 16 indoor units, with which different capacity and appearance. Applied intensively in office building, hotel, high grade department, villa etc. Introduction of GMV W– WESTPOINT M – Multi-connected (Max. 1:32) V – VRF system 2 ways to achieve VRV Inverter Originating from Japan, frequency conversion; Electrical adjustment; Rotor Reluctance motor Digital scroll Technology from Copeland; Mechanic adjustment; E.G. WMV in office building Combination with Outdoor fresh air processor Part ⅡResidential central air conditioner When central AC enter residential area… Virtues of Central Air Conditioner Central air conditioner-centralized processing、distributing； Baring comparatively higher EER, more energy saving; Residential Central Air Conditioner More comfortable, lower noise, less vibration, more accurate adjustment; Types of residential central AC Duct type Mini chiller WMV Family of residential central AC 1. Duct type • Low initial investment; • Indoor air quality improve by introduction of fresh air • Require enough height to layout the duct; • Individual adjustment for single room not available Mini Chiller-Hydraulic system 2. Mini Chiller •All-Water system (water or ethylene alcohol); •Adopt Fan coils as terminals, space saving; •Without fresh air introduction; •Individual control for each room available; E.G. WMV in detached house 3. WMV • Energy-saving; • Low initial investment; • Comfortable & Accurate; • Individual control; Figure: Ratio of VRV application in Japan Old building redecoration New facility Part Ⅲ WMV energy saving analysis New orientation in working concept Adopting digital scroll compressor Core factors Saving energy Using refrigerant as heat transfer medium Sophisticated controlling network Combination with heat recovery processor 1. New orientation in designing concept Traditional designing base on the most sever outdoor condition. Peak of EER/COP sets at partial load. (around 40% of the full load) Ratio of cooling load throughout one year % Cooling load (%) Working time (%) Cooling load (%) Working time (%) 100 1 50 45 75 42 25 12 Data originate: American Society of Heating, Refrigerating and Air-conditioning Engineers. (ASHRAE) 2. Adopt digital scroll compressor Traditional residential split type AC adopts Rotary type compressor; The efficiency of Scroll type compressor is higher than Rotary type or Reciprocal type compressor; Energy consumption can be reduced by 10-15% compared with the reciprocal type at the same capability; Comparing Items Scroll type Rotary type Reciprocal type EER 2.9 2.4~2.6 2.2~2.6 Volumetric efficiency 0.99 0.94 0.7 Adiabatic efficiency 0.98 0.93 0.88 Num. of part in compression chamber 1 3 7 Weight ratio 0.8 0.8 1.0 Machining precision 1~3 3 10~30 Output power 1~10 0.4~1 1~10 Core component of digital scroll Variable Capacity Adjustment is achieved by PWM (Pulse-WidthModulation) valve “Fixed Scroll” Discharge Pipe by-pass pipe Suction Pipe Loading Orbit Scroll Gap: 1mm between two scrolls! Idling Adjust capability output Pulse-width: Maintain a balance between Demanding and Providing; “Digital”: loading-100%(1), while Idling-0%(0), forming the sequence Cooling Capacity 0 1 0 1 0 1 0 1 0 1 0 1 0 1 ….. Digital Multi Unit Inverter Unit Capacity Demanded 3. Using refrigerant as heat transfer medium In GMV, heat transferred via refrigerant directly; The heat amount transferred can be 10 times of those transferred by water, and 20 times via air. Comparing: Property of heat transfer medium Types of medium Utilized heat Transfer amount Energy consumption (transfer 120 kW cool load) Water sensible heat 20.1kJ/kg (△t=5℃) 4.8 Air sensible heat 10.1kJ/kg (△t=10℃) 7.5 Refrigerant evaporating latent heat 206kJ/kg 2.6 54% of those transfer via water; 35% of those transfer via air; 4. Sophisticated intelligent controlling Controlling Object Forming the network Sensors (temperature, pressure); Throttling devices (electrical expansion valves, pore plates); Advanced logical algorism; Basic principle 5. Combination with heat recovery processor To improve the IAQ, people can open the windows sometimes, or install a ventilating fan connect to outside; But cooling load would rise, and unfiltered air with instable and unreliable factor would penetrate in. The Fresh Air Heat-Recovery System can solve this problem • Introduce more filtered fresh air into the room; • Recycle heat or cooling; (efficiency 75%) • Reduce the amount of poisonous released from the building material; The air route inside the system 1. Excellent water absorbability exchanging efficiency reaches 75%; 2. Super fire-retardant Safe and reliable 3. Mildew-proof, clean & healthy. Exhaust air Returning air of indoor Suction of outdoor air Cooled fresh air introduced in Compared to traditional way of ventilation, Fresh air processor reduces 28% of energy consumption! Part Ⅳ Digital scroll VS Inverter Capability adjustment Digital scroll Cooling Capacity Comparing items Inverter Digital Multi Unit Inverter Unit Capacity Demanded Common Inverter comp. Digital only Digital & common parallel connection SEER Electromagnetic interference Capacity Shift By-pass of refrigerant Can be omitted Sever disturbance, expensive electromagnetic-proof apparatus must be installed; Shift to 100% capability immediately Must have procedure of frequency conversion No need Have to install Summary WMV can be applied intensively in office building, hotel, luxury department, villa, etc. Enjoy a high EER/COP under partial load; Combination with fresh air processor, can improve IAQ & saving energy (up to 30%); Digital scroll type VRF is more reliable and flexible than Inverter.