Essays on Enthalpy

Introduction

In the adsorption-membrane hybrid system for ethanol steam reforming: Thermodynamics analysis by Dang, Amornchai, Yaneeporn, and Suttichai, (2011, International Journal of Hydrogen Energy), the authors seek to explain how an adsorption-membrane hybrid system, which uses a carbon (IV) oxide as an adsorbent can be used to eliminate unwanted carbon (IV) oxide in the hydrogen separation process. The authors aimed at improving the ethanol steam reforming performance through comparison of thermodynamic analysis that comprised of adsorptive, as well as membrane reactor. Then the authors were able to find that membrane separation process for the hydrogen removal had a higher impact ...

Introduction

At times, industries require the temperatures to be kept below the ambient for some processes to be effective. To do so, they must design ways to eliminate the excess heat generated by machines and introduce an artificial room temperature lower than the ambient. They must effectively eliminate temperatures above the ambient. A refrigerator is thus required in these operations. This refers to a device that can maintain the temperature below the ambient. The primary objective of a refrigeration process is to lower the temperature through heat removal. Since its invention, refrigeration has seen used in many industrial and household ...

Introduction

A refrigerator is an electrical device used in temperature maintenance below ambient temperatures. To achieve this function, the refrigerator should be able to create a heat sink at cold room temperatures a temperature that should be lower than the ambient temperature while at the same time also rejecting heats having higher temperatures than the ambient temperatures. To achieve this refrigerant is forced to undergo evaporation at temperatures lower than the ambient temperature(Griffiths, 1937). When the refrigerant is compressed at high pressure and condensing temperatures above the ambient temperature results in the loss of heat and condensation back to ...

Abstract

In this experiment, two calorimeters were designed and assembled. One was made using Styrofoam cups and another one using glass and foil. The calorimeters were studied for their performance in keeping the heat of the system. They were studied by measuring the heat loss of hot water over time. The heat lost in each calorimeter over 30 minutes was calculated. The calorimeter made of glass worked better and less heat was lost in it. The assembled calorimeters were used to find out the heat of reaction between NaOH and HCl per one mole of water. This value was found ...

Introduction

The fundamental process of thermal power plants is based on the conversion of thermal energy into mechanical energy and, subsequently, into electric power, using steam as the working fluid. According to the U.S. Energy Information System, over 67% of the electrical energy in the United States is generated through thermoelectric power plants, which use the combustion of fossil fuels such as natural gas, coal and petroleum to generate the steam necessary for the process; moreover, thermoelectric power generation accounts for an approximate 80% of all the power generation worldwide. Thus, the electricity consumed in most homes and industries is ...