Monthly performance report

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Material Information

Title:
Monthly performance report Hei Wai Wong
Series Title:
SOLAR ;
Added title page title:
Hei Wai Wong
Physical Description:
v. : ill. ; 28 cm.
Language:
English
Creator:
United States -- Dept. of Energy
Publisher:
Dept. of Energy
Place of Publication:
Washington, D.C
Publication Date:

Subjects

Subjects / Keywords:
Solar houses -- Hawaii -- Honolulu   ( lcsh )
Solar energy -- Hawaii -- Honolulu   ( lcsh )
Genre:
federal government publication   ( marcgt )
non-fiction   ( marcgt )

Notes

General Note:
F #'s in holdings refer to local FSEC accession no.
General Note:
"SOLAR/1014-79/05"
General Note:
February 1979.
General Note:
"SOLAR/1014-79/02" ; "SOLAR/1014-79/03"; "SOLAR/1014-79/04" ; "SOLAR/1014-79/05."
General Note:
National solar heating and cooling demonstration program, National solar data program.
General Note:
"SOLAR/1014-02" ; "SOLAR/1014-79/03" ; "SOLAR/1014-79/04" ; "SOLAR/1014-79/05."
General Note:
Monthly Catalog Number: gp 80018469

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 027190615
oclc - 05855560
System ID:
AA00013876:00003

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
    Back Cover
        Page 13
        Page 14
Full Text



SOLAR/i 014-79/04
Monthly Performance Report


HEI WAI WONG APRIL 1979










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








MONTHLY PERFORMANCE REPORT

HEI WAI WONG

APRIL 1979


i5STEM DESCRIPTION

The Hei Wai ',ong site is a four-story multifamily housing complex in Honolulu, Hawaii. Solar energy is used for preheating domestic hot water (DHW) and laundrY service hot water The solar energy system comprises three distinct,
essentially identical systems, only one of which is instrumented for performance evaluation. The instrumented system supplies preheated hot water to six apartment units and to the laundry of the housing complex. The system has an array of flat-plate collectors with a gross area of 807 square feet. The array faces south at an angle of 24 degrees to the horizontal. Water is the transfer mediumm that delivers solar energy from the collector array to storage and to the hot water loads. Solar energy is stored on the roof in a 1230-gallon storage tank. When solar energy is insufficient to satisfy the hot water loads, auxiliary water heating for each apartment is provided by electrical heating elements in individual 30-gallon DHW tanks. Auxiliary heating of hot water in the laundry is provided by a gas heater in the 85-gallon hot water tank. The system, shown schematically in Figure 1, has
two modes of solar operation.

Mode 1 Collector-to-Storage: This mode activates when a sufficient temperature difference exists between the collector surface temperature and the bottom of storage to activate a thermosiphon flow between collector and storage. The flow continues as long as the temperature difference is great enough to maintain the effect.

Mode 2 Storae-to-Load: This mode activates when there is a demand for hot water replenishment from either the individual DHW tanks or the laundry tank. The system is pressurized by the city water system.


Ii. PERFORMANCE EVALUATION


INTRODUCTION

The site was occupied in April and the solar energy system operated continuously during the month, Solar energy satisfied 94 percent of the DHW requirements. The solar energy system provided electrical energy savings of 83.6 million Btu and a fossil fuel energy savings of 4.5 million Btu.


WEATHER CONDITIONS

During the month, total incident solar energy on the collector array was 46.9 million Btu for a daily average of 1935 Btu per square foot. This was




































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above the estimated average daily solar radiation for this geographical area during April of 1134 Btu per square foot for a south-facing plane with a tilt of 24 degrees to the horizontal. The average ambient temperature during April was 74'F as compared with the long-term average for April of 75'F.


THERMAL PERFORMANCE

Sis~eri During April the solar energy system performed better than expected. The expected performance was determined from a modified f-chart analysis using measured weather and subsystem loads as inputs. Solar energy collected was 23.0 million Btu versus an estimated 10.5 million Btu. Solar energy used by the system was estimated by assuming that all energy collected would be applied to t ,e load. Actual solar energy used was 11.3 miillion Btu. System total solar fraction was 94 percent versus an estimated 87 percent.

Collector The total incident solar radiation on the collector array for the month of April was 46.9 million Btu. Since this is a thermosiphon operation, the insolation available during the period the collector loop was operating also arioounted to 46.9 million Btu. The total collected solar energy for the month of April was 23.0 million Btu, resulting in a collector array efficiency of 49 percent, based on total incident insolation. Solar energy delivered from the collector array to storage was 23.0 million Btu. Since this is a thermosiphon operation, there were no operating energy requirements.

Storaca Solar energy delivered to storage was 23.0 million Btu. There were 11.3 million Btu delivered from storage to the DHW subsystem. Energy loss from storage was 11.7 million Btu. This loss represented 51 percent of the energy delivered to storage. The storage efficiency was 49 percent: This is calculated as the ratio of the sum of the energy removed from storage and the change in stored energy, to the energy delivered to storage. The aver-age storage temperature for the month was 141'F.

DHW Load The DHW subsystem consumed 11.3 million Btu of solar energy and 0-.61 miillion Btu of auxiliary electrical energy and 0.15 million Btu of fossil fuel energy to satisfy a hot water load of 12.0 million Btu. The solar fraction of this load was 94 percent. There were no operating energy requirements. Solar c_'upport of the DHW subsystem in April resulted in an electrical energy savings of 8.6 million Btu and a fossil fuel energy savings of 4.5 million Et,,. A daily average of 528 gallons of DHW was consumed at an average temperature of 159'F delivered from the storage tank.


0 EPV AT 104 OS

The ,,indlspeed sensor malfunctioned. Since the derivation of wind direction is bas-ed in part on windspeed, the wind direction data was also invalid.


E EPOrY AVINGS

The solar energy system provided an electrical energy savings of 8.6 million Etu and a fossil fuel energy savings of 4.5 million Btu.









N'I ATIAN 'STATUS

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