of corresponding author:

Transcription

1 * * * ( 7 ) Survey on Partial Load Characteristics of Household Air-conditioner and Seasonal Coefficient of Operational Performance Combined with Dynamic Heat Load Calculation Takayuki Hosokawa, Tetsuo Hayashi and Kouji Nomura of corresponding author: hosokawa@hrmbox.eee.kyushu-u.ac.jp Now, 9% or more of the air conditioner used at home is an ability changeable type of the inverter method. However, only the performance in the state of ratings of JIS is described in the catalog of the air conditioner, and the relation to the frequency of the inverter is uncertain. In this paper, the partial load characteristic and the dehumidification ability of the ability changeable type air conditioner of the inverter method are investigated. Moreover, a numeric computing model of a household air conditioner is constructed based on the investigation result, and period COP of the air conditioner is evaluated by the single room calculation. Key words: Air-conditioner, Partial load characteristics, Dehumidification, Experiment.. ) 997 COP 998.8kW COP COP 9% ) JIS C 96 JIS B 86- Table Table Test condition of air-conditioning ability in JIS Dry bulb temperature[ ] Wet bulb temperature[ ] Indoor 7 9 Outdoor Cooling Heating Table Specification of air conditioner Rated capacity [W] 8 (7 ) Rated power 8 [W] consumption ( ) COP [-].8 Indoor air-flow [m /h] 6 Rated capacity [W] 6 (7 ) Rated power 7 [W] consumption ( 8) COP [-].97 Indoor air-flow [m /h] 67

2 . Table Air volume at each setting of air conditioner Table Table Setting strong weak silent Measured air volume [m /h] Ratio of air volume to strong setting Air volume after correction [m /h] 6 98 Table Experimental conditions 6[m /h] Table No. day / / / / /9 Setting of air-volum e strong weak silent auto strong Preset temperature [ C] Inlet temperature [ C] 6 Table Table Main measurement point Table Fig. Surface of coil Indoor inlet air Compressor Temperature Temperature, Humidity Frequency of input current. Fig. 6 Power consumption Indoor outlet air Power consumption of air-conditioner Temperature, Humidity - No. No. No. No. No [h] 6 Table 6 6 9Hz 9Hz Fig. Fig. Inlet temperature of Outdoor machine [W] Fig. q = / e = / COP Inlet temperature[ ]

3 Electric current frequency[hz] Electric current frequency Coil Surface Temperature [h] e q q Inlet temperature Temperature[ ] Fig. Electric current frequency, Inlet temperature and Coil surface temperature (No. ) Table 6 Relation of inlet air and coil surface temperature electric current frequency of compressor quantity of heat extraction, COP Condition No. No. No. No. No. One hour after driving begins T i T s T i T s T i T s T i T s = () T i T s Ts: Preset temperature,ti: Inlet temperature The numerical value in the table sequentially shows temperature difference between inlet air and coil surface[ C], electric current frequency of compressor[hz], Heat extraction rate[w] and COP[-] Electric current frequency[hz] Sensible heat processing[kw] Power consumption rate[-]..... Electric current frequency Electric power consumption Heat extraction rate strong weak silent auto.. Q s =.698Q strong weak silent auto. e=.68q -.q All heat processing[kw] Fig. Sensible heat ratio 7 6 Rated COP Electric power consumption or Heat extraction rate [kw] Fig. Electric current frequency Quantity of heat extraction Electric power consumption (No. ) COP Fig. Fig..698 Qs..... Partial load rate[-] Fig. Partial load characteristics =.698Q () Q Q s

4 ... Fig. 6 Fig. 7 Fig. 8 Fig. 6 Fig. 7 Fig. 8.. T out T in T coil W cvt ρ ( T ) = kt ( T ) + W () in out in coil c ρ V k W = () cv ρ Tcoil = ( Tout Tin ) + Tin () k k Fig. 9 8[h] k Fig. V k k = 88.V.7 () Humidity [g/kg'] Outlet Surface of Coil Inlet [h] Fig. 6 Comparison of inlet humidity and saturated humidity on surface of coil strong Humidity[g/kg'] Humidity[g/kg'] [h] Fig. 8 Comparison of inlet humidity and saturated humidity on surface of coil silent Sensible heat exchange ratio [W/K] [h] Fig. 7 Comparison of inlet humidity and saturated humidity on surface of coil weak [h] Sensible heat exchange ratio[w/k] strong weak silent Fig. 9 Sensible heat exchange rate at each air volume k=88.v Air volume[m /s] Fig. Relation of air-flow and sensible heat exchange ratio

5 . Maximum Cooling Performance of Air Conditioner Table Catalog value Sensible heat calculation.. Fig. Fig. () () ().. Fig. 8 8mm Table 7 ) 7 9 Table 6 7 6[m / h] Next step Indoor air Sensible heat Surface temperature of coil (Eq. ()) Indoor outlet humidity Saturated absolute humidity on coil Moisture equilibrium of the indoor air Indoor air humidity Latent heat extraction Total heat extraction Power consumption COP (Fig. ) Fig. Calculation flow latent heat extraction and Electric power consumption Table 7 Construction of walls (show from inside) side wall Calcium silicate board Grass wool siding board Fig. Building for calculation 8 mm mm mm Plywood mm ceiling Grass wool mm and floor Plywood mm window Plane glass 6mm 7 () () 986W. /h W g N

6 .. Table 8 Fig. 6 8 COP COP.8 Table 8 Fig. Fig. 6 COP. COP. COP COP Fig. 6 6 Fig. 6. ) ) ) No.7 pp.7-, Table 8 Removal heat quantity power consumption and COP of a Year Sensible heat extraction [kwh] 9 Latent heat extraction [kwh] 98 Total heat extraction [kwh] 8 Electric power consumption [kwh] COP [-]. temperature[ ] Relative humidity[%] Heat extraction[kw] Electric power consumption[w] outdoor indoor 8/ 8/ Fig. Outdoor and indoor temperature outdoor indoor 8/ 8/ Fig. Outdoor and indoor humidity Sensible Latent All 8/ 8/ Fig. Quantity of heat extraction. Electric power COP 7. 8/ 8/ Fig. 6 Electric power consumption and COP COP[-]