high temperature hot water systems design

... embedded systems than in desktop systems.  Embedded systems often have power constraints.  Embedded systems often must operate under extreme environmental conditions.  Embedded systems ... always the case, it is a reality for many designs today. The profound implications of this simultaneous design process heavily influence how systems are designed. Introduction Figure 1.1 provides ... resources than desktop systems.  Embedded systems often store all their object code in ROM.  Embedded systems require specialized tools and methods to be efficiently designed.  Embedded...

Ngày tải lên: 16/08/2012, 09:40

Ngày tải lên: 05/09/2013, 08:40

Ngày tải lên: 05/09/2013, 10:15

... host-based software design. In other words, what do you do when there is no printf() or malloc()? Because this is a book about designing embedded systems, I will discuss design issues — but ... recent graduate. Even if you aren’t studying embedded systems at UWB, reading this book can be important to your future career. Embedded systems is one of the largest and fastest growing specialties ... experience, should be comfortable with the content. Preface Why write a book about designing embedded systems? Because my experiences working in the industry and, more recently, working with...

Ngày tải lên: 30/09/2013, 01:20

... embedded systems than in desktop systems.  Embedded systems often have power constraints.  Embedded systems often must operate under extreme environmental conditions.  Embedded systems ... resources than desktop systems.  Embedded systems often store all their object code in ROM.  Embedded systems require specialized tools and methods to be efficiently designed.  Embedded ... fan combination are. Embedded systems must operate under extreme environmental conditions Embedded systems are everywhere. Everywhere means everywhere. Embedded systems must run in aircraft,...

Ngày tải lên: 30/09/2013, 01:20

... support systems. An ex- ception is high- temperature hot water, discussed later in this chapter. 6.3.1 Water properties Refer to Tables 6.1 and 6.2 for water properties over a wide range of temperatures ... Handbook, 2000 HVAC Systems and Applications, Chap. 14, ‘‘Medium- and High- Temperature Water- Heating Systems. ’’ 6. Ingersoll-Rand, Cameron Hydraulic Data, Woodcliff Lake, N.J., 1988. Design Procedures: ... used in calculating water flow quanti- ties. To determine the water quantity required to serve a given load, divide the load, in Btu per hour, by 500 and by the desired water temperature drop or...

Ngày tải lên: 17/10/2013, 22:15

... the Layer 3 access design and the recommended best practices, please see the Designing a Campus Network for High Availability and associated High Availability Campus L3 Access Design Guides: http://www.cisco.com/application/pdf/en/us/guest/netsol/ns432/c649/cdccont_0900aecd801a8a2d.pdf ... results. Campus Designs Tested The specific designs chosen to be tested were determined based on the hierarchical design recommendations as outlined in Designing a Campus Network for High Availability. ... is a critical step in designing, upgrading, and operating a highly available, secure campus network. This document is an accompaniment to Designing a Campus Network for High Availability: http://www.cisco.com/application/pdf/en/us/guest/netsol/ns432/c649/cdccont_0900aecd801a8a2d.pdf....

Ngày tải lên: 18/10/2013, 18:15

... upward so long as the mixed air temperature is above a minimum. The high- limit sensor returns the flow rate set point to minimum whenever the OSA temperature is too high for econ- omy. The REL damper ... website. 223 Chapter 8 Design Procedures: Part 6 Automatic Controls 8.1 Introduction HVAC systems are sized to satisfy a set of design conditions, which are selected to generate a maximum load. Because these design ... as the room temperature varies from the set point. An indirect control signal is the use of the outside air temperature as a reference to reset the building heating water supply temperature. Many...

Ngày tải lên: 20/10/2013, 16:15

... 7.1–7.8) suggest four-pipe systems, in which chilled water and hot water or steam are separated. A two-pipe distribution system is designed to provide either hot or chilled water (but not both at ... feedwater to the boiling point. This also tempers the water to reduce the potential for damaging the boiler with a shot of cold water. Feedwater makeup to boilers is accomplished with feedwater pumps. ... glycols. Feedwater should be introduced to the system through a pressure- reducing valve, set for a pressure below the maximum operating pres- sure of the boiler. 7.5 High- Temperature Hot Water Plants High- temperature...

Ngày tải lên: 20/10/2013, 16:15

... Chapter Nine Air in Water out Tower fill Water sprays Water eliminator Water in Air out Figure 9.14 Forced-draft cooling tower. difference between the leaving cooling water temperature and the ... 303 Air out Water in (sprays) Tower fill Air in Water out Figure 9.15 Natural-draft cooling tower. A flow is induced by chimney and stack effect. Water in Air in Air in Fill Water in Air out Water out Figure ... type, with the water in the tubes and the refrigerant in the shell (Fig. 9.12). Chiller capacity control is not normally related to condenser water temperature. However, the water temperature may...

Ngày tải lên: 24/10/2013, 15:15

... ft 3 /min GPM ϭ water flow rate, gal/ min a i , a o ϭ air in, air out w i , w o ϭ water in, water out GTD ϭ greatest temperature difference, air to water LTD ϭ least temperature difference, air to water ln ... steam or hot water, which is heated elsewhere and transported through a piping system to the point of use. 10.12 Heat Exchangers Water Heating Heat exchangers for steam to water or water to water ... A water quantity is assumed, and coil k factors are determined. The air temperatures for outside air and exhaust air entering the coils are part of the HVAC design. The water and/or brine temperatures...

Ngày tải lên: 24/10/2013, 15:15

... chilled water, cool irrigation water, well water, and the like. Heating may utilize any available viable service including direct or indirect gas-fired devices, oil-fired devices, steam or hot water ... disadvantages as the multizone AHU. Many of the older systems installed in the 1950s and 1960s were designed with high- velocity /high- pressure duct systems to minimize the space occupied by the ducts. ... is assumed. Then, for an as- sumed 20ЊF temperature difference between the room and supply air temperatures (58ЊF supply air), the design flow rate of air, designated CFM, in cubic feet per minute...

Ngày tải lên: 28/10/2013, 22:15

... not hold up well in hot environments. Carry this observation over into plant design considerations. 12.11 Lighting Systems Lighting design ranges from following a cookbook to a high- level art form. ... The HVAC designer must work closely with the electrical designer to sat- isfy the needs of both disciplines. 12.13 Summary In building construction, HVAC design is interwoven with the electri- cal design, ... of HVAC Systems 405 detection systems go into alarm, the fan systems must turn off. Fur- ther sophistication gets into smoke control in buildings, a separate topic by itself. Lighting systems: ...

Ngày tải lên: 07/11/2013, 19:15

... years. 2 Computer-aided design and drafting (CADD) systems are available for lease or purchase or on a timeshar- ing basis from computer service companies. As software has become more sophisticated, the systems ... lack of acceptance—of the product, which is the design. Early in the development of computer-aided design (CAD) techniques, it was felt that computer- Design Documentation: Drawings and Specifications Downloaded ... as given at the website. 411 Chapter 13 Design Documentation: Drawings and Specifications 13.1 Introduction Design documents evolve from and include the designer’s calculations, equipment selections,...

Ngày tải lên: 07/11/2013, 19:15

... project designer. 14.2 Participation during Construction Designer participation during construction and beyond varies greatly with design office practice and with the owner’s desires. Some design offices ... during construction, relieving the design office of any possible in- volvement, except to clarify a conflict in documents or a design error. Source: HVAC Systems Design Handbook Downloaded from Digital ... later. The designer or reviewer needs to be ac- quainted with the design intent in this phase of the work. 14.2.3 Work oversight and field review The designer can only expect what the designer inspects! Periodically...

Ngày tải lên: 07/11/2013, 19:15

... the hardware designer and not a hardware/software design issue, most digital hardware designers have little or no training in the arcane art of RF suppression. Usually, the hotshot digital wizard ... Embedded Design Life Cycle Unlike the design of a software application on a standard platform, the design of an embedded system implies that both software and hardware are being designed in ... always the case, it is a reality for many designs today. The profound implications of this simultaneous design process heavily influence how systems are designed. Introduction Figure 1.1 provides...

Ngày tải lên: 13/12/2013, 11:15

Ngày tải lên: 15/12/2013, 03:15

Ngày tải lên: 15/12/2013, 03:15

Ngày tải lên: 15/12/2013, 03:15