Presentation on theme: "WESTPOINT Commercial Air conditioners INVERTER VRF COMMERCIAL A/C."— Presentation transcript:
WESTPOINT Commercial Air conditioners INVERTER VRF COMMERCIAL A/C
Contents Whats WMV & VRF? 1 Residential central air AC 2 WMV energy consumption analysis 3 Digital scroll VS Inverter 4
Part GMV & 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; Digital scroll Technology from Copeland; Mechanic adjustment; Rotor Reluctance motor
E.G. WMV in office building Combination with Outdoor fresh air processor
Part Residential 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 All-Water system (water or ethylene alcohol); Adopt Fan coils as terminals, space saving; Without fresh air introduction; Individual control for each room available; 2. Mini Chiller
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 WMV energy saving analysis New orientation in working concept Adopting digital scroll compressor Using refrigerant as heat transfer medium Sophisticated controlling network Combination with heat recovery processor Core factors Saving energy Core factors Saving energy
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) Cooling load (%) Working time (%) Cooling load (%) Working time (%) Data originate: American Society of Heating, Refrigerating and Air-conditioning Engineers. (ASHRAE) Ratio of cooling load throughout one year %
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 ItemsScroll typeRotary typeReciprocal type EER2.92.4~2.62.2~2.6 Volumetric efficiency Adiabatic efficiency Num. of part in compression chamber 137 Weight ratio Machining precision1~3310~30 Output power1~100.4~11~10
Core component of digital scroll Suction Pipe Discharge Pipe Fixed Scroll by-pass pipe Orbit Scroll Variable Capacity Adjustment is achieved by PWM (Pulse-Width- Modulation) valve Loading Idling Gap: 1mm between two scrolls!
Adjust capability output Pulse-width: Maintain a balance between Demanding and Providing; Digital: loading-100%(1), while Idling-0%(0), forming the sequence ….. Digital Multi Unit Inverter Unit Cooling Capacity 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 heatTransfer amount Energy consumption (transfer 120 kW cool load) Watersensible heat 20.1kJ/kg ( t=5 ) 4.8 Airsensible heat 10.1kJ/kg ( t=10 ) 7.5 Refrigerant evaporating latent heat 206kJ/kg % of those transfer via water; 35% of those transfer via air;
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. Returning air of indoor Cooled fresh air introduced in Exhaust air Suction of outdoor air Compared to traditional way of ventilation, Fresh air processor reduces 28% of energy consumption!
Part Digital scroll VS Inverter Comparing items Digital scrollInverter Capability adjustment SEER Electromagnetic interference Can be omitted Sever disturbance, expensive electromagnetic-proof apparatus must be installed; Capacity Shift Shift to 100% capability immediately Must have procedure of frequency conversion By-pass of refrigerant No needHave to install Digital & common parallel connection Common Inverter comp. Digital only Digital Multi Unit Inverter Unit Cooling Capacity Capacity Demanded
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.