analysis of the influences of solar radiation and façade glazing ...

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3.5 Optimization of a solar domestic hot water system 96 Q st [W/m 2 absorber] 0 -1 -2 -3 -4 -5 -6 January -2,62 February -5,87 March -2,12 April -1,48 May June Fig. 3.47: The monthly average value of solar collector heat loss. Another important consideration in the design of a DHW system is the optimal volume of a storage tank. Calculations were performed for storage volumes ranging from 1 m 3 to 12 m 3 . The accumulated solar energy rose and auxiliary energy demand decreased with the enlargement of the volume of the storage tank. As shown in graph below (Fig. 3.48), the recommended volume of accumulated water, which will be heated by the solar panels, is about 4 m 3 . Design of two storage tanks is recommended. One device will work during the winter and both in parallel connection will be used during the warm periods of the year. July August September October November -2,24 December -1,66
3.5 Optimization of a solar domestic hot water system 97 Fig. 3.48: Dependence of accumulated solar energy on the storage tank volume. Fig. 3.49 depicts the average daily water temperature inside the storage tank with a volume of 2 m 3 (solid line) and of 6 m 3 (dashed line). We can clearly observe that the increase in system thermal capacity leads to the prolonging of the storage tanks operating period with raised output temperatures. As shown in Fig. 3.49, the simulation results can be approximated by the second order polynomial function of temperature versus time. Storage tank temperatute [ 0 C] 60 50 40 30 20 10 0 Energy [kWh] 01/01 12 000 10 000 8 000 6 000 4 000 2 000 01/21 0 02/10 Auxiliary energy demand Solar energy 0 1 2 3 4 5 6 7 8 9 10 11 12 Storage tank volume [m 3 ] 03/02 03/22 04/11 Fig. 3.49: Average daily storage tank temperature for a volume of 2 m 3 and of 6 m 3 . 05/01 05/21 2 m3 6 m3 Approx. 2 m3 Approx. 6 m3 06/10 Eq. (3.7) represents temperature profile for 2 m 3 tank volume and Eq. (3.8) fit the numerical data for 6 m 3 tank volume. 06/30 07/20 08/09 08/29 09/18 10/08 10/28 11/17 12/07 12/27
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ANALYSIS OF THE INFLUENCES OF SOLAR
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than the inner air temperature. It
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4.1 SUMMARY .......................
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Subscripts σ - Stefan-Boltzmann co
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1.1 Introduction 9 Another problem,
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1.2 Background and literature revie
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2.1 Building energy simulation soft
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2.1 Building energy simulation soft
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Page 47 and 48: 2.2 Experimental research methods 4
Page 53 and 54: 3.1 Building description 53 Fig. 3.
Page 55 and 56: 3.1 Building description 55 All int
Page 57 and 58: 3.1 Building description 57 Case B5
Page 59 and 60: 3.1 Building description 59 Of cour
Page 61 and 62: 3.1 Building description 61 Outside
Page 63 and 64: 3.1 Building description 63 In orde
Page 69 and 70: 3.2 Selection of the optimal glazin
Page 71 and 72: 3.3 Estimation of thermal energy ga
Page 79 and 80: 3.4 Testing of a building indoor en
Page 81 and 82: 36 34 32 30 28 26 24 22 20 18 36 34
Page 83 and 84: 3,00 2,50 2,00 1,50 1,00 0,50 0,00
Page 91 and 92: 3.5 Optimization of a solar domesti
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Page 99 and 100: 4.1 Summary 99 4 Summary and conclu
Page 101 and 102: 4.2 Comments and conclusions 101 So
Page 103 and 104: 4.3 Future research 103 of the annu
Page 105 and 106: References 105 Beausoleil-Morrison,
Page 107 and 108: References 107 Hendron, R., et al.
Page 109 and 110: References 109 Rees, S. and Haves,
Page 111 and 112: References 111 Yohanis, Y.G., et al
Page 113 and 114: Appendix 1 113 Fig. A1.1 VASATI 2.0
Page 123 and 124: Appendix 2 123 !-Generator IDFEdito
Page 125 and 126: Appendix 2 125 0.035, !- Conductivi
Page 127 and 128: Appendix 2 127 , !- Zone Inside Con
Page 129 and 130: Appendix 2 129 Discrete; !- Numeric
Page 131 and 132: Appendix 2 131 Fraction, !- Schedul
Page 133 and 134: Appendix 2 133 Air Conditioner:Wind
Page 135 and 136: Appendix 2 135 , !- Sensible Heat F
Page 137 and 138: Appendix 2 137 281, !- Lighting Lev
Page 139 and 140: Appendix 2 139 OG2 InfilTRATION, !-
Page 141 and 142: Appendix 2 141 OG3, !- Zone Name 16
Page 143 and 144: Appendix 2 143 0.004, !- Zone Heati
Page 145 and 146: Appendix 2 145 Zone15WindACAirInlet
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Appendix 2 147 0, !- Maximum Flow R
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Appendix 2 149 Zone16WindACOAMixer,
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Appendix 2 151 Zone 9 Outlet Node;
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Appendix 2 153 Stand Alone ERV 16,
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Appendix 2 155 ZoneHVAC:WindowAirCo
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Appendix 2 157 ZoneHVAC:Baseboard:C
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Appendix 2 159 Zone Control Type Sc
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Appendix 2 161 WindACPLFFPLR, !- Pa
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Appendix 2 163 Stand Alone ERV Supp
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Appendix 2 165 0.03001, !- Maximum
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Appendix 2 167 0.81, !- Sensible Ef
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Appendix 2 169 !- == ALL OBJECTS IN
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