Abstract: . . .  thermal solar Conceptual Design of a Solar-Thermal Heating System with Seasonal Storage for a Vashon Greenhouse Anna Henson A thesis Page 1 Conceptual Design of a Solar-Thermal Heating System with Seasonal Storage for a Vashon Greenhouse Anna Henson A thesis submitted in partial fulfillment of the requirements of the degree of Master of Science in Mechanical Engineering University of Washington 2006 Program Authorized to Offer Degree: Mechanical . . .
. . .  [hl,Th]=hload(t,Th,CAP_h) %All heat values in MJ Hg=[1x8760 array]; Hl=[1x8760 array]; Th_i=Th; if Th<18.1 hl=max(0,Hl(t)-Hg(t)); else hl=0; end if Th>24 Th=Th+min(0,Hg(t)-Hl(t)+hl)/(CAP_h); else Th=Th+(Hg(t)-Hl(t)+hl)/(CAP_h); end Greenhouse Heat Transfer Function Code function [L]=ghHX_(T5,Temp4) %Heat Delivery Design, Determine length of tubing needed using finite element explicit %euler method with 0.1m finite length size T4=max(Temp4); l=.5; Ts= 22; N=4; %number of loops [Cp4]=SpH(T4); [Cp5]=SpH(T5); Mdot2=0.3226; %minimum flow rate Q_=Mdot2*(N*(T4*Cp4-T5*Cp5)); %heat out loop for minimum flow rate and maximum . . .
. . .  prevent over 2.2 million kg CO 2 equivalents of greenhouse gasses from being emitted to the environment over the 20-year life of the system. However, at 20.4 cents per kWh, this system does not appear to be economically feasible even when the cost of carbon sequestration is taken into account. The solar-thermal heating system costs more per kWh than natural gas heating with carbon sequestration even for a 50 year system lifetime. The best opportunity for cost reduction is to maximize the volume to surface area ratio of the storage system by creating a heating system with a circular cross section . . .
. . .  Heat_outTotal=Heat_toLoad+Heat_outTank Heat_in_out=IN_OUT(k) Top_Temp_Change=dt4(k) Mid_Temp_Change=dt7(k) Bottom_Temp_Change=dt6(k) Final_Temp_top=Temp4(8760) Final_Temp_mid=Temp7(8760) Final_Temp_bottom=Temp6(8760) H k MinStratification=min(min(abs(min(TM)),abs(min(MB)))) MaxStratification=max(max(TM),max(MB)) Vol_Eq HeatingTubeLength=L cost figure (1); subplot(3,1,1);plot(Hour,Temp4);title('Tank Temp Top'); subplot(3,1,2);plot(Hour,Temp7);title('Tank Temp Mid'); subplot(3,1,3);plot(Hour,Temp6); title('Tank Temp Bottom'); figure (2); subplot(3,1,1);plot(Hour,QC);title('Collector Heat Supply'); subplot(3,1,2);plot(Hour,QD);title('Greenhouse . . .
. . .  W=9/12/3.28083989501; %Spacing of tubing (m), set at 9 inches D_i=0.02192; %Inner diameter of pipe (m) D_o=0.028575; %Outer diameter of pipe (m) D_s=((W/4)^2+(4/12/3.28083989501)^2)^.5*2; %Diameter surface corresponding to 4" of sand and 9" spacing k_p=1.23; %Conductivity of pipe (W/m-C) from Vanguard Piping Systems, Inc., 2004 k_s=2.25; %Conductivity of wet sand (W/m-C) from Hendrickx. Page 139 130 k_w=0.65; %Conductivity of water at 330K (W/m-K) from Incropera and DeWitt pg 924 rho=984.25; %Density of water at 330K (kg/m^3) from Incropera and DeWitt pg 924 mu=4.89e-4; %Dynamic viscosity of water at 330K . . .
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