How would you define its second-law efficiency

Assignment Help Civil Engineering

Reference no: EM131249921

1. The performance of an ammonia absorption cycle refrigerator is to be compared with that of a similar vapor-compression system. Consider an absorption system having an evaporator temperature of -10?C and a condenser temperature of 50?C. The generator temperature in this system is 150?C. In this cycle, 0.42 kJ is transferred to the ammonia in the evaporator for each kilojoule transferred from the high-temperature source to the ammonia solution in the generator. To make the comparison, assume that a reservoir is available at 150?C, and that heat is transferred from this reservoir to a reversible engine that rejects heat to the surroundings at 25?C. This work is then used to drive an ideal vapor-compression system with ammonia as the refrigerant. Compare the amount of refrigeration that can be achieved per kilojoule from the high-temperature source with the 0.42 kJ that can be achieved in the absorption system.

2. If we neglect the external irreversibilities due to the heat transfers over finite temperature differences in a power plant, how would you define its second-law efficiency?

Reference no: EM131249921

Questions Cloud

Introduction to data collection and analysis : How will you get the data you need to test your hypotheses? What tools or devices will you use to make or record observations?

Problem regarding the consumer behavior : Consumer behavior Think of a product that you recently bought. Mention, What, Where, How And When you BOUGHT itDescribe what happened at every step of the purchase decision

Examines the work of the spanish baroque master : View the video about the exhibition held at the [London] National Gallery that examines the work of the Spanish Baroque master, Diego Velazquez, narrated by the [London] Times art critic

What are the four functions of management describe : What are the four functions of management? Describe. List and explain the three leadership styles. Offer examples of where each type of leadership might work best.

How would you define its second-law efficiency : If we neglect the external irreversibilities due to the heat transfers over finite temperature differences in a power plant, how would you define its second-law efficiency?

Present and future values and expected returns : Critically reflect on the importance of present and future values. What factors must be considered when calculating present and future values? What other qualitative factors play into present and future value decisions? Perhaps you have opportuni..

Small and medium-sized companies : Some observers claim that the internet revolutionizes the way small and medium-sized companies (SMEs) can compete in the global market place. In essence, the internet has created a level playing field for SMEs.

Does shift make the later productions more or less horrific : Near the end of the documentary, Gatiss makes a comment about the rules of British horror changing in that "sensation had suddenly overtaken suggestion" by the time horror films began to fall out of style. Does this shift make the later productions..

Convey the understanding and scope of the proposal : Convey the understanding and scope of the proposal. Give a thorough explanation of the proposal, and highlight relevant research to support the main idea.

User Account

All Pages