logic controller with tuning mechanism via output scaling-factor method for HVAC system. The developed HVAC controller is specifically applied to Air Handling Unit (AHU) upstream process where mixing dampers are modulated to provide a lowest enthalpy of airstream entering AHU downstream process. This method is expected to improve HVAC performance that is measured in terms of thermal comfort level in the space it serves and the energy it consumes. The main function of HVAC is to overcome
Premium HVAC Fuzzy logic Control theory
N12/4/CHEMI/SPM/ENG/TZ0/XX 88126104 CHEMISTRY standard level Paper 1 Friday 9 November 2012 (afternoon) 45 minutes INSTRUCTIONS TO CANDIDATES • Do not open this examination paper until instructed to do so. • Answer all the questions. • For each question‚ choose the answer you consider to be the best and indicate your choice on the answer sheet provided. • The periodic table is provided for reference on page 2 of this examination paper. • The maximum mark for this examination
Premium Zinc Atom Periodic table
Division Ave. High School Ms. Foglia AP Biology Metabolism & Enzymes AP Biology 2007-2008 Forms of Energy Energy Is the capacity to cause change Exists in various forms‚ of which some can perform work Kinetic energy Is the energy associated with motion Potential energy Is stored in the location of matter Includes chemical energy stored in molecular structure AP Biology 1 Division Ave. High School Ms. Foglia AP Biology Energy
Premium Energy Thermodynamics Entropy
1. Air in a room is at 220C d.b. and RH = 60%. Find the following conditions from the psychrometric chart: specific volume‚ dew point‚ specific enthalpy‚ wet-bulb temperature and moisture content. 2. Outdoor air at 0 0C d.b. and 100% saturation is heated with a low-pressure hot-water battery to 30 0C d.b. Identify all the condition data for both entry and exit states. 3. Re-circulated room air at 21°C d.b.‚ 50% saturation is mixed in equal amounts with summer outdoor air at 31°C d.b.‚ 22
Premium Mass flow rate Dew point Thermodynamics
Heat exchanger A heat exchanger is a device that is used to transfer thermal energy (enthalpy) between two or more fluids‚ between a solid surface and a fluid‚ or between solid particulates and a fluid‚ at different temperatures and in thermal contact. In heat exchangers‚ there are usually no external heat and work interactions. Typical applications involve heating or cooling of a fluid stream of concern and evaporation or condensation of single- or multicomponent fluid streams. In a few heat exchangers
Premium Heat transfer
with the OH- ions from the base. H+(aq) + OH-(aq) H2O(l) When a weak acid is neutralised some of the energy is needed to dissociate the molecules to make the hydrogen ions available for neutralisation. The result is a value for neutralisation enthalpy lower than - 57 kJ/mol (numerically lower‚ not more negative!) Note that as the weak acid is in equilibrium as the hydrogen ions are ’mopped up’ by the base the equilibrium shifts to the right hand side to make more until eventually all of the
Premium Hydrogen Acid PH
SCH 4U1 FINAL EXAM REVIEW ATOMIC STRUCTURE AND MOLECULAR ARCHITECTURE 1. Describe the wave mechanical model of the atom. 2. Write the ground state electron configuration for Br. 3. Explain why the first ionization energy for Ne is significantly greater than Na. 4. Distinguish between ionization energy and electronegativity. 5. How does VSEPR Theory account for the fact that the bond angle in H2O is less than NH3? 6. Which of the following molecules are polar? Include diagrams
Premium Acetic acid PH Acid dissociation constant
determined in order to get steady values of results. Secondly‚ the values of temperature were recorded for the different points corresponding to the P-h chart. Once the temperature was found‚ it is plotted in the P-h chart to determine the values of enthalpy for the respective points. Compared the ideal values of COP with the actual values and note the significance. Apparatus: Refrigeration Cycle Results: Values Mass Flow Rate 1 bar 5bar 40g/s Data obtained from reading
Premium Thermodynamics
absorber-stripper section of a process plant where a number of four streams have been identified for heat integration. FIGURE 1: Absorber-stripper process area T and H represent the stream temperature and stream enthalpy‚ respectively. The index S and T refer to supply and target data. It is desired to do heat integration for the absorber-stripper process. a. Extract the data for all the four streams to be integrated and identify the stream type and the heat capacity
Premium Thermodynamics Energy conservation Energy
pubs.acs.org/joc Mechanism and Regioselectivity of the Osmium-Catalyzed Aminohydroxylation of Olefins Dominik Munz and Thomas Strassner* Physikalische Organische Chemie‚ Technische Universit€t Dresden‚ Mommsenstrasse 13‚ 01062 Dresden‚ a Germany thomas.strassner@chemie.tu-dresden.de Received November 12‚ 2009 The mechanism and regioselectivity of the osmium-catalyzed aminohydroxylation of olefins was investigated in detail by density functional theory (B3LYP/6-31G(d)) calculations in
Free Chemical kinetics Chemical reaction Transition metal