Heat Pinch Targeting the minimum heat utility required for the CHCP stsyem Based on the calculated energy balances , 1 hot streams and 3 cold streams can be identifed. The details are tabulated as below: Stream Supply T emperature, T s Target Temperature, Tt Heat Capacity Flow Rate No . T ype (°C(°C(!" .!#1 $ot %&& 3& 5.423 ! Cold 3& %&& 5.571 " Cold 3& %&& 4.399 # Cold 3& 1'& 18.967 Beore proceed to the pinch design, a minimum temperature, )Tmin between the closet point between the hot and cold composite cur*e has to be decided irst. The *alues o)T min will result in a lower hot and cold utility re+uirement, and this helps to target the minimum energy usage. or this e-periment ) Tmin o1&°C has been selected or this process. Stream Supply Temperat ure, Ts Target Temperat ure, Tt Shifted Supply Temperature ,T$s Shifted T arget Temperature, T$t Heat Capacity Flow Rate N o. T yp e (°C(°C(°C(°C(!".!#1 $ot %&& 3& 1&.& %&.& /.%0! Col d 3& %&& &.& %1&.& /./21 " Col d 3& %& &.& %1&.& 3./0% # Col d %/ 1'& 3/.& 1&.& 1'.02 T o target the pinch t emperature, roblem T able 4lgorithm is used due to the reason that it is more accurate and more con*enient as compared to graphical method Shift Tempe rature Interv al T(i+1)- Ti mC pnet dH Infeasible Cascade Feasible Cascade °C °C kW/ K kW 21▼ & ▼ 32%0.3 '1 1 20 - 9.96 97 - 199.39 4 dema nd # 1.3#1.31!▼ # 1.3▼ 3/%0.'2 2 150 - 23.5 132 - 3526.9 868 dema nd # 3/%0.#3/%0."#I$CH ▼ # ▼ &
