Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

Possible Energy Saving Light Changes - Paper Project | ECON 228, Study Guides, Projects, Research of Economics

Material Type: Project; Class: Environmental & Resource Econ; Subject: Economics; University: Wellesley College; Term: Unknown 1989;

Typology: Study Guides, Projects, Research

Pre 2010

Uploaded on 08/17/2009

koofers-user-kt8
koofers-user-kt8 🇺🇸

10 documents

1 / 1

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Asha Stenquist, Surita Patel, Freena Chohan
Possible Energy Saving Light Changes
1) Switching to energy saving lights: compact fluorescent (CFL) light bulbs use up to 75% less energy
and last up to 10 years longer than incandescent bulbs1
2) Turning lights off when not in use: occupancy-sensing light switches automatically turn lights off
when room is not in use; daylight-sensing light switches turn lights off when ambient lighting is sufficient;
timers turn lights off at same time each day
Potential Benefits of Energy Saving Lighting
1) Reduced energy use
2) Reduced energy costs
3) Reduced environmental footprint (particularly reduced CO2 emissions)
4) Enhanced image as an environmentally aware institution
Potential Projects
3rd and 4th Floors of Pendleton Hall
1) Atrium: daylight override and timer
costs: $140 savings: $517.19 per year payback time: 3 or 4 months
2) Hallways: Change 48 incandescent lights to CFLs
costs: $52 savings: $206.49 per year payback time: 4 or 5 months
3) Classrooms:
a. install occupancy sensors
costs: $280 savings $85.84 per year payback time: 3 years
b. turn off ½ of lights
costs: $0.00 savings: $110.38 per year payback time: instant!
4) Small Rooms: install occupancy sensors
costs: $350 savings: $117.42 per year payback time: 3 years
5) Bathrooms: install occupancy sensors
costs: $350 savings: $137.59 per year payback time: 3 years
6) Offices: no potential changes
payback time for occupancy sensors is too long
1 www.gelighting.com
2Audit of Wellesley College’s Greenhouse Gas Emissions
Campus-Wide Implementation of Pendleton Projects
Pendleton is already lit relatively efficiently; this is not true for all buildings on campus. The
potential projects outlined for Pendleton can be applied campus-wide, with even greater results. For
instance, installing occupancy sensors in just one set of stacks in Clapp Library would cost $450
initially, and would save $3195.65 per year
Calculation Process
- Number and types of lights were determined through direct observation and from Wellesley
College lighting plans
- Average number of hours lit was estimated by direct observation at various times of day
- Price of energy was assumed to be $0.08
- CO2 emissions per KWH was assumed to be 2.0438 x 10-3 of CO2 2
At a Glance…
Description: Evaluation of replacing inefficient
incandescent lights with compact fluorescents, and
installing occupancy or daylight override sensors to
reduce energy use, energy cost, and environmental
footprint
Buildings: Pendleton is already relatively
environmentally efficient, so changes would be simple
and minimal; other buildings on campus are less
efficient, so the same changes that are possible in
Pendleton would result in greater savings elsewhere.
$ Costs and Savings in Pendleton:
If Projects with payback time less than 3 years were
implemented…
Total costs= $1,172
Net savings in first year= $2.91
Net savings in following years = $1,174.91
Environmental Impact:
Reduction in CO2 emissions=
30 tons per year
(equivalent to the CO2 absorbed annually by 4,615
healthy trees!)

Partial preview of the text

Download Possible Energy Saving Light Changes - Paper Project | ECON 228 and more Study Guides, Projects, Research Economics in PDF only on Docsity!

Asha Stenquist, Surita Patel, Freena Chohan

Possible Energy Saving Light Changes

1) Switching to energy saving lights: compact fluorescent (CFL) light bulbs use up to 75% less energy

and last up to 10 years longer than incandescent bulbs^1

2) Turning lights off when not in use: occupancy-sensing light switches automatically turn lights off

when room is not in use; daylight-sensing light switches turn lights off when ambient lighting is sufficient;

timers turn lights off at same time each day

Potential Benefits of Energy Saving Lighting

  1. Reduced energy use
  2. Reduced energy costs
  3. Reduced environmental footprint (particularly reduced CO 2 emissions)
  4. Enhanced image as an environmentally aware institution

Potential Projects

3 rd^ and 4th^ Floors of Pendleton Hall

1)Atrium: daylight override and timer

costs: $140 savings : $517.19 per year payback time : 3 or 4 months

2)Hallways: Change 48 incandescent lights to CFLs

costs : $52 savings : $206.49 per year payback time : 4 or 5 months

3)Classrooms:

a. install occupancy sensors

costs : $280 savings $85.84 per year payback time : 3 year s

b. turn off ½ of lights

costs: $0.00 savings : $110.38 per year payback time : instant!

4)Small Rooms: install occupancy sensors

costs : $350 savings : $117.42 per year payback time : 3 years

5)Bathrooms: install occupancy sensors

costs : $350 savings: $137.59 per year payback time : 3 years

6)Offices: no potential changes

payback time for occupancy sensors is too long

1 www.gelighting.com

2 Audit of Wellesley College’s Greenhouse Gas Emissions

Campus-Wide Implementation of Pendleton Projects

Pendleton is already lit relatively efficiently; this is not true for all buildings on campus. The

potential projects outlined for Pendleton can be applied campus-wide, with even greater results. For

instance, installing occupancy sensors in just one set of stacks in Clapp Library would cost $

initially, and would save $3195.65 per year

Calculation Process

- Number and types of lights were determined through direct observation and from Wellesley

College lighting plans

- Average number of hours lit was estimated by direct observation at various times of day

- Price of energy was assumed to be $0.

- CO 2 emissions per KWH was assumed to be 2.0438 x 10-3^ of CO 2 2

At a Glance…

Description: Evaluation of replacing inefficient incandescent lights with compact fluorescents, and installing occupancy or daylight override sensors to reduce energy use, energy cost, and environmental footprint Buildings: Pendleton is already relatively environmentally efficient, so changes would be simple and minimal; other buildings on campus are less efficient, so the same changes that are possible in Pendleton would result in greater savings elsewhere. $ Costs and Savings in Pendleton: If Projects with payback time less than 3 years were implemented… Total costs= $1, Net savings in first year= $2. Net savings in following years = $1,174. Environmental Impact: Reduction in CO2 emissions= 30 tons per year (equivalent to the CO2 absorbed annually by 4, healthy trees!)