buletinul institutului politehnic din iaşi - Universitatea Tehnică ...

More documents

Recommendations

Info

300 Mirela Panaite et al. Fig. 1 – Schematic representation of refrigeration system: where: T1 1 – refrigerant temperature at suction compressor [ºC]; T2 T2 – refrigerant temperature at discharge compressor [ºC]; T3 T3 refrigerant temperature at condenser inlet [ºC]; T4 T4 – refrigerant temperature at condenser outlet [ºC]; T5 T5 – air temperature at inlet evaporator 1 [ºC]; T6 T6 –air temperature at outlet evaporator 1 [ºC]; T7 T7 – refrigerant temperature at discharge of evaporator 1 [ºC]; T8 T8 – air temperature at inlet evaporator 2 [ºC]; T9 T9 – air temperature at outlet evaporator 2 [ºC]; T10 T10 – refrigerant temperature at discharge of evaporator 2 [ºC]; T11 T11 – air temperature at condenser inlet [ºC]; T12 T12 – air temperature at condenser outlet [ºC]. 2.1. Calculation of the Theoretical Eco-efficiency Parameters The theoretical eco-efficiency parameters discussed in this paper are: the performance coefficient, annual energy consumption and TEWI factor. For finding the eco-efficiency parameters, classic thermodynamics thermodynamics relations together with parameters defined defined in Table 1 were used (Ţârlea (Ţârlea et al., 2010). 2010). Finding the performance coefficient: First of all was calculated the refrigerant mass flow by M& Φ = Δh 0 , ev (1)
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 301 where Δhev is enthalpy difference at evaporation working condition [kJ/kg]; M is the refrigerant mass flow rate [kg/s]. Secondly, the mechanical power for the compressor was found, by (2) , W& = M& Δh cp cp where: Wcp is the mechanical power [kW]; & compression working conditions [kJ/kg]. Δ hcp is the enthalpy difference at Finally, the results of the coefficient of performance (COP) by Φ0 COP = . W& Finding the annual energy consumption: The annual energy consumption (Eannual) is calculated according SR EN 378-1 by E = n n P (4) cp annual hours days e. Finding the TEWI factor The TEWI factor is calculated by SR EN 378-1 by TEWI = GWP ⋅ Ln + GWP ⋅m1− α + n E β (5) ( ) years rec years annual where: GWP – global warming potential [-]; L – refrigerant leak during a year working [kg]. Table 2 shows the global warming and ozone depletion potential values for analysed refrigerants (Ţârlea et al., 2011). Table 2 Global warming and ozone depletion potential values Refrigerant GWP ODP R404A 3260 0 R717 0 0 R507A 3300 0 (3) L= mscm. (6) 3. Theoretical Eco-Efficiency Study Results The theoretical results are presented in the next lines by tables and figures. Table 3 shows the study results for the coefficient of performance, annual energy consumption and TEWI factor (Zabet & Ţârlea, 2011). As it is shown in Fig. 2, the electrical power for R717 refrigerant is 15% smaller than R404A and R507A and this electrical power savings has a great impact over the environment pollution and maintenance cost.
Page 1:
BULETINUL INSTITUTULUI POLITEHNIC D
Page 5 and 6:
Page 7:
VICTOR COTOROS şi EMIL BUDESCU, As
Page 10 and 11:
ALEXANDRU RADU, CONSTANTIN PANĂ an
Page 13 and 14:
Page 15 and 16:
Bul. Inst. Polit. Iaşi, t. LVIII (
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39:
Page 42 and 43:
30 Daniel Dragomir-Stanciu and Mari
Page 44 and 45:
32 Daniel Dragomir-Stanciu and Mari
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61:
Page 64 and 65:
52 Ionel Oprea and low viscosity ar
Page 66 and 67:
54 Ionel Oprea COP PT Puterea speci
Page 68 and 69:
56 Ionel Oprea 8. GWP - global warm
Page 70 and 71:
58 Ionel Oprea suplimentari, cum ar
Page 72 and 73:
60 Răzvan Florin Barzic et al. Cur
Page 74 and 75:
62 Răzvan Florin Barzic et al. 3-
Page 76 and 77:
64 Răzvan Florin Barzic et al. 3.
Page 78 and 79:
66 Ionel Ivancu et al. the second s
Page 80 and 81:
68 Ionel Ivancu et al. a b Fig. 4 -
Page 82 and 83:
70 Ionel Ivancu et al. Gut J.A.W.,
Page 84 and 85:
72 Ion Zabet and Graţiela-Maria Ţ
Page 86 and 87:
Page 88 and 89:
Page 90 and 91:
Page 92 and 93:
Page 94 and 95:
82 Victor Pantilie et al. many rese
Page 96 and 97:
84 Victor Pantilie et al. industria
Page 98 and 99:
86 Victor Pantilie et al. Another i
Page 100 and 101:
88 Victor Pantilie et al. At the en
Page 102 and 103:
90 Victor Pantilie et al. Tang X.,
Page 104 and 105:
92 Alexandru Radu et al. Furthermor
Page 106 and 107:
94 Alexandru Radu et al. Spark timi
Page 108 and 109:
96 Alexandru Radu et al. Fig. 3 - B
Page 110 and 111:
98 Alexandru Radu et al. 4. The bes
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127:
Page 130 and 131:
118 Eugen Rusu et al. in PM emissio
Page 132 and 133:
120 Eugen Rusu et al. also be used
Page 134 and 135:
122 Eugen Rusu et al. Fig. 3 - Maxi
Page 136 and 137:
124 Eugen Rusu et al. Fig. 6 - HC e
Page 138 and 139:
126 Eugen Rusu et al. Pe lângă ce
Page 140 and 141:
128 Adrian Sabău et al. arguments
Page 142 and 143:
130 Adrian Sabău et al. The energy
Page 144 and 145:
132 Adrian Sabău et al. during fue
Page 146 and 147:
134 Adrian Sabău et al. 11 T ⎛ 0
Page 148 and 149:
136 Adrian Sabău et al. No experim
Page 150 and 151:
138 Adrian Sabău et al. calculated
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163:
Page 166 and 167:
154 Marius Receanu et al. where: qr
Page 168 and 169:
156 Marius Receanu et al. In Fig. 2
Page 170 and 171:
158 Marius Receanu et al. the ambie
Page 173 and 174:
Page 175 and 176:
Page 177 and 178:
Page 179 and 180:
Page 181:
Page 184 and 185:
172 Mariana Lupchian Propulsion eng
Page 186 and 187:
174 Mariana Lupchian Fig. 1 - The p
Page 189 and 190:
Page 191 and 192:
Page 193 and 194:
Page 195 and 196:
Page 197:
Page 200 and 201:
188 Costică Atanasiu et al. comput
Page 202 and 203:
190 Costică Atanasiu et al. γ= ε
Page 204 and 205:
192 Costică Atanasiu et al. The sa
Page 206 and 207:
194 Costică Atanasiu et al. Fig. 1
Page 208 and 209:
196 Costică Atanasiu et al. elasti
Page 210 and 211:
198 Ovidiu Niţă et al. rejection
Page 212 and 213:
200 Ovidiu Niţă et al. aluminium
Page 214 and 215:
202 Ovidiu Niţă et al. a b Fig. 5
Page 216 and 217:
204 Ovidiu Niţă et al. căreia ac
Page 218 and 219:
206 Ovidiu Niţă and Vasile Braha
Page 220 and 221:
Page 222 and 223:
Page 224 and 225:
Page 226 and 227:
214 Marian Teodor Popescu et al. 2.
Page 228 and 229:
216 Marian Teodor Popescu et al. Sp
Page 230 and 231:
218 Marian Teodor Popescu et al. Th
Page 233 and 234:
Page 235 and 236:
Page 237 and 238:
Page 239:
Page 242 and 243:
230 Victor Cotoros and Emil Budescu
Page 244 and 245:
Page 246 and 247:
Page 248 and 249:
Page 250 and 251:
Page 252 and 253:
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Page 261 and 262: Bul. Inst. Polit. Iaşi, t. LVIII (
Page 267 and 268: BULETINUL INSTITUTULUI POLITEHNIC D
Page 297 and 298: PC Cell calibration Bul. Inst. Poli
Page 311: Bul. Inst. Polit. Iaşi, t. LVIII (
Page 317: Bul. Inst. Polit. Iaşi, t. LVIII (
show all

buletinul institutului politehnic din iaşi - Universitatea Tehnică ...

Create successful ePaper yourself

Delete template?

Save as template?