By Lal Jayamaha
Confirmed concepts and strategies for lowering power intake estate and facility managers can flip to Energy-Efficient construction structures as a one-stop consultant to working and protecting advertisement construction platforms at height potency. Designed to aid lessen strength expenses and meet environmental criteria, this cutting-edge productiveness software comprises absolutely illustrated, real-world examples of winning eco-friendly development tasks that experience completed major, energy-saving effects. From power administration and auditing, HVAC platforms, cooling towers, and pumping systems…to lights, electric structures, automation, and development envelope, this specialist source takes readers step-by-step via strategies for purchasing optimum functionality from each development approach. for every procedure, the booklet offers the newest tools for bettering efficiency…identifying promising new solutions…evaluating their feasibility…and estimating genuine discounts. finished and authoritative, Energy-Efficient construction structures allows construction execs to: Get an in-depth realizing of the rules of every development method opt for the most productive structures for any nonresidential development Maximize strength potency with useful innovations and suggestions make the most of hands-on tools for comparing feasibility and estimating reductions evaluate real-world examples of profitable eco-friendly development initiatives within This Cost-Saving power advisor • power administration and effort Auditing • Air-Conditioning and significant Chiller platforms • Boilers and Heating platforms • Pumping structures • Cooling Towers • Air dealing with and Distribution platforms • lights platforms • development electric structures • construction Automation structures • construction Envelope
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Extra resources for Energy-Efficient Building Systems: Green Strategies for Operation and Maintenance
The chiller loading (500 RT) and chiller efficiency are assumed to be fixed. 2 (Chiller loading and efﬁciency are ﬁxed) Energy cost ϭ Cooling load ϫ hours of operation ϫ efficiency (kW/RT) ϫ electricity tariff. 02). Similarly, the annual energy cost for operating each of the three chillers can be computed. 3. 5 kW/RT high-efficiency chiller has the lowest total cost over a 10-year period, and is therefore the best option of the three. Normally, the loading of chillers vary with time due to changes in the cooling load.
Chillers are classified according to the type of compressor used for compressing the refrigerant. The main types of compressors used are reciprocating, scroll, screw, and centrifugal. Reciprocating compressors use pistons and connecting rods driven by a crankshaft, as shown in Fig. 6. The crankshaft is driven by a motor. In open type drives, the drive motor is mounted externally and the crankshaft extends through a seal out of the crankcase. In hermetic systems, the motor and the compressor are contained in the same housing and the crankshaft and motor are in direct contact with the refrigerant.
Chillers are usually oversized for new building installations due to the unavailability of accurate load estimation tools, leading to the use of high safety factors in the design. This over sizing repeats even when the systems are retrofitted since replacement of chillers is often done on a oneto-one basis. Also, chillers are normally sized to meet the peak load without much consideration of the load profile. 13 100 200 300 Cooling load (RT) 400 500 600 Typical chiller part-load curve. a building varies with time, this can result in chillers operating at part load for long periods of the day, wasting much energy.
Energy-Efficient Building Systems: Green Strategies for Operation and Maintenance by Lal Jayamaha