Chapter 8, Problem 8.68P

Q A Solar water heating System connected to 250 kg water- energy storage tank has UA equal 12 2 and is located in aroom that is at a constant temperature 20c where the load is 20 MJ, the final temp storage tank is not exceeding to 98e, the intial temp. is use Find the required energy delivered to storage tank take ( st=1) 2. Calculate the number of collectors if the efficiency of the collector is yo% the dimensions of the Collector is (100 cm * 75cm) and the total globle radiation is 6.6 Kwh/m² .

. 10kg/sec of steam enters a condenser with enthalpy of 2300kJ/kg and velocity of 350m/s , the condensate leaves the condenser with enthalpy of 220kJ/kg and a velocity of 70m/s find the heat transfer to the coolingwater in ton/h.

complt solution

Note: Use the relevant chart for each problem.in addition to having the solution on a piece of paper Q2/ A refrigeration system operates according to reversed Carnot cycle, low temperature is -40 °C and the work done is 1.2 kW/TR. Find; the coefficient of performance as refrigerator and heat pump, absorbed heat and rejected heat.

The condensing pressure for a Rankine engine is 0.001325  MPavac. Calculate the following for steam flow rate  =  1 kg/sec of steam when the steam at the beginning of expansion is at 119.6 deg SH and 4.0 Mpaa.  Draw the TS and equipment diagrams for the ideal and actual case and find for the following for the ideal case: Pump work in KW. Ans. Ideal heat rate in KJ/KW-hr. Ans. Rankine engine efficiency (%). Ans. Cycle thermal efficiency ( %). Ans

The refrigeration system of a food production firm is run using the Reversed Carnot Cycle. The temperature of the hot refrigerant supply in the system should be 52°C, while the temperature of the sink should be -14°C. Its capacity is projected to be at least 24 tons. It's important not to disregard losses. Find and Show unit analysis and conversion: a. COP and COP of Heat Pump b. Heat rejected from the system in kW c. Network in, Hp and Energy Efficiency Ratio

Q.1/ The hot source temperature is 227 degree Celsius and the sink is 127 degree Celsius of the Carnot engine. Find the efficiency of the engine. Also find the heat input from the source and the heat rejected to the sink when 10000 J of work is done. Draw the flow energy diagram

A refrigerant 134a of a vapor compression refrigeration system includes a liquid-suction heat exchanger. The heat exchanger cools saturated liquid coming from the condenser from 45 °C to 37 °C with the saturated vapor which comes from the evaporator at -8 °C. Calculate: a.) The COP of the system without heat exchanger. b.) The COP of the system with the heat exchanger. c.) Find the percent increase of performance of the system with the heat exchanger based on the system without heat exchanger. d.) Draw the schematic and P-h diagram of the two set-up.

Solve fast and show steps. Within 20minutes.