Monthly performance report

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Material Information

Title:
Monthly performance report Aratex Services, Inc
Added title page title:
Aratex Services, Inc
Physical Description:
v. : ill. ; 28 cm.
Language:
English
Creator:
United States -- Dept. of Energy
Publisher:
Dept. of Energy
Place of Publication:
Washington
Publication Date:

Subjects

Subjects / Keywords:
Solar energy -- California -- Fresno   ( lcsh )
Solar water heaters   ( lcsh )
Genre:
federal government publication   ( marcgt )
non-fiction   ( marcgt )

Notes

General Note:
National solar data program.
General Note:
Monthly Catalog Number: gp 80007791
General Note:
National solar heating and cooling demonstration program.
General Note:
"SOLAR/2008-79/05" ; "SOLAR/2008-79/06."

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 027035388
oclc - 05895805
System ID:
AA00013848:00002

Table of Contents
    Front Cover
        Page i
        Page ii
    Main body
        Page 1
        Page 2
        Page 3
        Page 4
        Page 5
        Page 6
        Page 7
        Page 8
        Page 9
        Page 10
        Page 11
        Page 12
        Page 13
        Page 14
        Page 15
        Page 16
    Back Cover
        Page 17
        Page 18
Full Text



SOLAR/2008- 79/05

Monthly Performance Report



ARATEX SERVICES, INC.
MAY 1979











SU.S. Department of Energy

National Solar Heating and
Cooling Demonstration Program

National Solar Data Program




































NOTICE
This report was prepared as an account of work sponsored by the United States Government. Neither the United States nor the United States Department of Energy, nor any of their employees, nor any of their contractors, subcontractors, or their employees, make any warranty, express or implied, or assume any legal liability or responsibility for the accuracy, completeness or usefulness of any information, apparatus, product or

L process disclosed, or represents that its use would not infringe privately owned rights.









MONTHLY PERFORMANCE REPORT
ARATEX SERVICES, INC.
MAY 1979


1. SYSTEM DESCRIPTION


The ARATEX Services, Inc. site is an industrial laundry in Fresno, California. The solar energy system is designed to provide approximately 20 percent of the energy to maintain the temperature of the process water at 1800F. It has an array of 140 flat-plate, Lexan-glazed collectors manufactured by Ying Manufacturing Company. They face south at a tilt of 30 degrees from the horizontal. The collectors have a gross area of 6,500 square feet. Water is used as the medium for delivering solar energy from the collector array to storage. The solar heated water is stored in a 12,000-gallon tank. Auxiliary energy is supplied by a low pressure, gas-fired boiler. In addition, a heat exchanger, utilizing energy from a waste water storage tank, preheats the city water input supply. The solar energy system can be isolated from the auxiliary heating system in the event of a malfunction without a reduction in overall system heating capacity.


The system, shown schematically in Figure 1, has three modes of operation.


Mode 1 Collector-to-Storage: During this mode of operation, water is pumped from the water solar thermal storage through the collectors and back into storage. This mode is entered when the temperature of the collector outlet exceeds the storage temperature by 4.5'F and continues until this differential temperature drops below 1.5'F.


Mode 2 Hot Water Demand: This mode is entered when there is a demand by the laundry for hot water. City water entering the Domestic Hot Water (DHW) system is preheated using the waste water in the 16,500gallon holding tank. The temperature of the input city water is raised to approximately 115'F before entering water solar thermal storage. As











water is withdrawn from water solar thermal storage, it passes through steam heat exchanger HX2, where auxiliary energy is added to maintain te 4,000-gallon laundry DHW storage at 180'F. Additional energy is supplied to DHW storage by extracting energy from the condensate line of heat exchanger HX3, as shown in Figure 1.


Mode 3 WasteWater: When the water in the water solar
thermal storage reaches 180'F, it is circulated by reverse flow through heat exchanger HXl, in the heat recovery system, thus storing any excess solar energy in the waste water holding tank. This mode is used to prevent overheating the 12,000-gallon fiberglass storage tank and allows the waste water holding tank to be used as a secondary solar storage
tank,


1. PERFORMANCE EVALUATION


A. Introduction


The system performance evaluations discussed in this section are based primarily on analysis of the data presented in the attached computergenerated monthly report, The report consists of daily site thermal energy values for each subsystem, plus environmental data. The pertornance factors discussed in this report are based upon the definitions contained in NBSIR 76-1137, Thermal Data Requirements and Performance Evaluation Procedures for the National Solar Heating and Cooling Demonstration Program.


TIe solar energy system at the ARATEX Services, Inc. site operated continuously during May and satisfied 24 percent of the hot water load. Hot water heating is the only solar-assisted function at this site. The total system load at ARATEX is defined as the sum of the energy supplied by the solar energy system, plus the energy supplied by the auxiliary energy system. The total load was 711.46 million Btu for the month of May.












r not impact onj the energy requi rements of
tr 1" r&!r rvh(,e f~te do f aec t t he s olar energy col lected
turlry.TV e~-Cd insolation in the plane of the Cr t' -.t~ ~'(Luf day, during Mawhich is near the

lac. --18 j~ -day, a- _erived froum measurements






d o 402 million Bin of solar energy incident on
r r u~o he crt ollie~ loop pup 2 cj operating. The system
C i i on Btu or a[-. proxy 1tel 28 percent of the total nthe -llector a rra_ Thle opera ti on of the col



he -age clail\ tdprtrso trq uring Mlay rne
-) ain average dai- te nature of 139'F for
ie k f storag effic_ a2 Q as 100 percent.

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load was 711.46 million Btu. Of the 711.46 million Btu total system load, 219.09 million Btu were supplied by the heat recovery system. This reduced the energy requirements on the solar and auxiliary energy subsystems to 492.38 million Btu. Of the 492.38 million Btu, 119.50 million Btu were supplied by the solar energy system. The remaining 372.87 million Btu were supplied by the auxiliary energy system.


D. Observations


It can be observed in the attached computer printout of this report that the solar ener y collected and the solar energy delivered to storage are the same. This is because both were calculated using the measurements W100, T101, and T151. Normally the solar energy collected is computed as a function of WOO, T100, and T150, while the energy delivered to storage is computed as a function of WlOO, T101, and T151. The difference in calculating solar energy collected during May, using T101 and T151 as opposed to TIOO and T150 results in a measured value of nine percent less energy collected.


Solar energy collected using TIOI and T151 was more consistent with changes in stored energy during periods when no energy was being extracted storage, than was the case when TIOO and T150 were used to
calculate solar energy collected. These energy imbalances can be caused by relatively small uncertainties in the temperature measurements. This is because of the large mass flow rate through the collector array and the small (approxiiiiately 5'F to 7'1-) temperature change across the collector array. No instrumentation changes would solve this problem. Therefore, for each month, data will be evaluated to determine which sensors most nearly results in a total system energy balance.














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The total hot water consumed at ARATEX is based on te fl ow sensor W as opposed to W3c2. When comparing the integrated values of GC, 3C and W302 for tie month, the result of using W303 more nearly represents the expected not water consumption. However, using W303 can be nisleadIng when u-erving hot water consuwptior om a dai'v basis, since fil1ino the tanKs hill appear as hot water consumption; tis however, has 7ttle
effect on the monthly values.


Duirir the month o May, the total ene p required to raise the water fucm the average nlet temperature of C to an average cutet tempratre f 174 'F as 711.46 million Btu. his 711.46 million Etu is in comparison to the design load of -,7?.03 million Btu. The difference
betweEn 7ne actual hot water load arc the desicr la is due to the
c4ffcrance in actual hot water consmpion and the expected consumption when the sytmwas in the, Jesign phas e,


E. Energy Saigs


The equivalent fossil fuel save: the use of solar energy was 199.17 illion Btu at ne expense of 2.19 millior Bt of electrical .nergy to operate +.,h solar collector pump, P2. The heat recovery system supplied 2.09 rni ion Btu o thermal energy to eet f not water -o req ierientr o ertin tris to fossil fuel requirements, it u t3 1
million Btu of additional fossil fuel savings. The rteing epense of
C r e, ecovery system was 1.25 million Btu. The fossil enrq saving
corutaions for solar as well as the heat recovery system are based on a crmparion of the projected energy requirements of a convention fossil
fuel boiler with an efficiency of 0.60 and the energy requirements of the solar energy system.


III. ACTION STATUS



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