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Given a facilitys hourly chilled water (CHW) cooling load demand shown in the following spreadsheet, a combined chiller and stratified CHW thermal storage system is

Given a facilitys hourly chilled water (CHW) cooling load demand shown in the following spreadsheet, a combined chiller and stratified CHW thermal storage system is proposed to meet the demand while saving the cost (due to the time-of-use rate schedule). A full storage operating strategy (load shift) is employed in which the chiller is completely turned off for the 5-hour ON-PEAK rate period from 12pm to 4 pm (why 5 hours? It starts from 12pm to 5pm, i.e., from 12-1pm, 1-2pm, 2-3pm, 3-4pm, and 4-5pm.) with the cooling load solely provided by the CHW storage system. During the NON ON-PEAK period (5pm to 11am), the chiller will meet the instantaneous cooling load demand in addition to store thermal capacity.

Construct an Excel spreadsheet based on the one in the next page which illustrates the load shifting operating strategy and answer questions 1-10 on Blackboard.

Chiller EER (Energy Efficiency Ratio) = 7.6 (COP = EER / 3.412)

Electricity rates:

Summer

kWh of on-peak billing demand

$0.21/kWh

kWh of off-peak billing demand

$ 0.17/kWh

Time of day

Facility hourly CHW cooling load

(tons)

Chiller + CHW storage system

Hourly chiller output

(tons)

CHW storage charge inventory (ton-hours)

12:00am

1094

1:00am

1015

2:00am

950

3:00am

979

4:00am

969

5:00am

968

6:00am

1274

7:00am

1367

8:00am

1457

9:00am

1773

10:00am

2176

11:00am

2518

12:00pm

2668

0

1:00pm

2831

0

2:00pm

2900

0

3:00pm

2900

0

4:00pm

2784

0

5:00pm

2598

6:00pm

2348

7:00pm

2077

8:00pm

1935

9:00pm

1836

10:00pm

1711

11:00pm

1302

Total

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