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- Path: sparky!uunet!think.com!ames!sgi!cdp!ei
- From: Essential Information <ei@igc.apc.org>
- Newsgroups: sci.energy
- Date: 31 Dec 92 13:54 PST
- Subject: Re: Energy Ideas - HVAC-2
- Sender: Notesfile to Usenet Gateway <notes@igc.apc.org>
- Message-ID: <1466300138@igc.apc.org>
- References: <1466300134@igc.apc.org>
- Nf-ID: #R:cdp:1466300134:cdp:1466300138:000:2133
- Nf-From: cdp.UUCP!ei Dec 31 13:54:00 1992
- Lines: 47
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- SAVING MONEY BY SWITCHING TO GAS-DRIVEN ENGINES
-
-
- Some facilities have managed to lower their energy costs by
- switching from an electric to a natural gas-powered vapor
- compression air chiller. Utilities have begun offering
- Demand-Side Management rebates to facilities that install
- gas-driven engines. While electric engines have a higher
- coefficient of performance (the ratio of the cooling output to
- the energy input), the inefficiency of electricity generation and
- transmission makes the overall efficiency of gas and electric
- engines nearly equal.
-
- CASE STUDY:
-
- Chiller Installation at University
- The State University of New York at Buffalo sought to air
- condition portions of an old building which houses the chemistry
- department. The three-floor, 220,000-square-foot building has
- classrooms on the first floor and offices and laboratories, which
- need air conditioning, on the second and third floors. The
- facility manager estimated that the building required about 300
- to 400 tons of cooling. The building did not have the existing
- service to supply power to an electric chiller. Supplying that
- service would have cost $210,000.
-
- Instead, a gas-engine-powered, horizontal screw chiller was
- installed in 1989. This chiller was chosen because it is easy to
- maintain and because of the differences in fuel prices. Taking
- efficiencies into account, electricity would cost $2.10 per therm
- (100,000 British thermal units) while natural gas only cost 40
- cents per therm. The cost of the gas-powered chiller was
- $180,000, but with a gas utility rebate of $70,000, the chiller
- cost only $30,000 more than an electric chiller. The annual
- savings have been nearly $10,000. The chiller availability has
- been almost 100 percent; the only shut-down occurred when the
- lubricating pump needed to be repaired. Aside from the economic
- benefits, the facility manager stressed the ease of maintenance
- and the compact size of the chiller (4' x 12' x 7') which allowed
- it to fit easily in the basement of the building. (Contact: Fred
- Smeader, University Facility Engineer, SUNY Buffalo, 115 John
- Beane Center, Buffalo, NY 14260, (716) 645-2612.)
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