Subject Sustainable Thermal Technologies This is a full ques

Subject: Sustainable Thermal Technologies, This is a full question, please provide full answers if you know how to do them, thank you!!

Q2. An adsorption refrigeration cycle with an activated carbon/methanol as the working pair, as shown in Fig 1, is designed according to the following parameters: Tev = 0°C, T.-Tam,-20°C and Teollector peak = 98°C. Using D-A and C-C equations to determine: a) The concentrations of methanol in the carbon at point 1 and point 3, ie. Xl and X3; The COP of the refrigeration cycle if the mass of the collector itself can be ignored. b) c) An ice maker is designed and built according to this cycle and has 2m2 collector area. If on the location of the ice maker is placed, the daily solar isolation (on the collector surface) is 3kWh/m\'day and the thermal efficiency of the collector is 50%, what is the quantity of 0°C ice that could be made from 30°C water by the ice maker per daily cycle? The values of methanol and the carbon properties required are: For methanol Ave. latent heat of evaporation is 1200kJ/kg; Ave. heat of adsorption is 1500kJ/kg;

Solution

Those who joined my Target 2011 and Mock Test Programme refer to this question and solution. My question in Mock Test series was as follows: The most popular Zero Calorie sugar substitutes in the market are made up of Sucralose, as an artificial sweetner. Why sucralose does not have calories? (A)Because the Sucralose is 600 times more sweet than Sucrose (Natural Sugar) and thus its low quantity gives same taste but zero calories when it is digested in the body. (B)Because the chemical composition of Sucralose is such that its oxidation gives less calories in body compared to the Sucrose. (C)Because Sucralose is not a Carbohydrate (D)Because Sucralose is not digested in the body And the solution was as follows: Sucralose is calorie free because majority of it is not broken down by the body. The actual caloric content of a single-serving (1-gram packet) is 3.36 calories. Since it is less than 5 calories, it is labeled as Zero Calorie. If there is any calorie associated with the products made up of Sucralose, it may be because of the dextrose etc. which may be used to give it a volume. Sucralose is about 600 times sweeter than natural sugar, while asparatame is about 200 times sweeter. Sucralose is not metabolized by the body, hence, there is no further breaking down. BUT in this question, Aspartame is metabolized by the body into two constituent amino acids and methanol. These hydrolysis products are handled by the body in the same way as aspartic acid, L-Phenylanine and metanol from other consumed foods. These components yield NO calory and add nothing new to the diet. So the correct option is D