Question

6.172 heat pump using 2 kW of power input. It keeps a chicken A farmer runs a hatchery at a constant 30°C while the room loses 10 kW to the colder outside ambient a 10°C. Find the COP of the heat pump, the rate of entropy generated in the heat pump and its heat exchangers, and the rate of entropy generated in the heat loss process? Problem 2. Sappe the sewers shows in Figre 4.10 have @*0 md Qamd Qrame unkws By sampling the flow at the finst manhole, it is found that the concetion of dsod sids in the flow coing into Manhole I is 50 mgL An addtional flow,100Lis added so Mahole 1,and this flow contains 20% disslved solds -s00 L to0000m G. 1000m Recall that 1%-10,000 mg) The ow through Manhele 2 is sampled and Sound to contain 1000 mpl dissolved solids What is the ow rate of wawin the sewer (. Soation Apain follow the peneral nles Sp Draw the diagram, which is given in Figure 4.10 Sp 2. Add all isfomaion, including concentration. Sp 3. Manhole lis the black box Sep 4. What is to be balmcod? I the ows ane halancel hene are two unknowns. Can something clse be balanced? Suppoe a balance is in tes of the sods? Sep 5 Wrise the material balance Sor sods [Solid] [Se IN OUT Solids LATED Solds PRODUCED CONSUMED A cady state assamptica allows the firt sem to be am and bocae no solids ane prodaced or consamed in the sysm the last two i e a so the aquation roduces tor -ISeids ow inl-ISalids ow ou+0-0 [email protected]+0Cl-10,Cel+0- Noe tht Lin x (mpL)- (mg solidmin) This ss in an ein with o usknowas so it is necessary to skip sap6 and pceed to p 7 Step 7, If more than cne unknown varile results from the aloion esi ancther balance. A balanoe in terms of the volame fow e is wdume IN ne ACCUMULATED OUT Vee ne CONSUMED o]- Apain, the firE tem and e lat twe ems are asmed so be a 010+l-1@c and 0-Q.+100- Thene now are two cquations with two unknowns Subtine inst equion (c -00 into the so-100)+200,000 100)100o and solve O-21.047 Lin21.000 Lmis and O-20.947Unin20900Lmn

Answer 1

i9-2 2--10 = 12-kc) lo Rate o geretion in te het punp entor 12 303 10 Sgen = O Oo426 Rate o entror rertn tehestsproces 283