Monthly performance report

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Material Information

Title:
Monthly performance report Terrell D. Moseley
Added title page title:
Terrell D. Moseley
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 -- Virginia -- Lynchburg   ( lcsh )
Solar houses -- Virginia -- Lynchburg   ( lcsh )
Genre:
federal government publication   ( marcgt )
non-fiction   ( marcgt )

Notes

General Note:
National solar data program.
General Note:
Monthly Catalog Number: gp 80007799
General Note:
National solar heating and cooling demonstration program.
General Note:
"SOLAR/2011-79/03" ; "SOLAR/2011-79/04" ; "SOLAR/2011-79/05."

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 027035464
oclc - 05877400
System ID:
AA00013843:00002

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
    Back Cover
        Page 14
        Page 15
Full Text
i7

SOLAR/2011-79/03


Monthly Performance Report


.TERRELL D. MOSELEY MARCH 1979











--O U.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 process disclosed, or represents that its use would not infringe privately owned rights.










MONTHLY PERFORMANCE REPORT
TERRELL D. MOSELEY
MARCH 1979


I. SYSTEM DESCRIPTION


The Terrell D. Moseley Co. site is a 1,780-square foot, single story, commercial office building with attached warehouse in Lynchburg, Virginia. The solar energy system is designed to provide approximately 70 percent of the space heating and hot water energy requirements of the office building. Because the hot water consumption is very low, only the space heating system is monitored for performance evaluation. The site has a collector array of 16 flat-plate collectors built by T. D. Moseley. The collector array has a gross area of 400 square feet, and faces south at a tilt angle of 50 degrees from the horizontal. Water is the heat transfer medium throughout the solar energy system. Collected solar energy is delivered to the 2,000gallon storage tank, which is in an unheated attached warehouse building. The insulation on the tank is four inches of fiberglass.


When solar energy is insufficient to maintain 105'F storage temperatures, a gas-fired boiler (auxiliary heater) provides additional energy to storage. Space heating is provided by circulating storage water through a heat exchanger located in the air distribution system of the building. Since the collector fluid automatically drains into storage after each solar energy collection operation, additional collector freeze protection measures are not required.


The system, shown schematically in Figure 1, has three modes of solar operation, which are described below.


Mode Collector-to-Storage: This mode is entered when the collector
absorber plate temperature exceeds the middle storage temperature by 20'F. The transfer fluid is circulated from storage through the collectors and back to storage until this temperature differential drops to less than 3'F.






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Mode 2 Storage-to-Space Heating: This mode is entered when there is a demand for space heating and the sensed temperature of the storage water is greater than 850F. Water is circulated between storage and liquid-to-air heat exchanger HXI in the air-handling unit distribution duct until the space heating demand is satisfied, or the sensed storage temperature drops below 850F.


Mode 3 Storage-to-Heat Pump: This mode of operation will provide space heating when "ode 2 operation is not available. This mode is entered when tnere is a demand for space heating and tne temperature of the storage water is below 85'. Energy input to the heat 0mp is supplied by opening the normally closed valve V2, closing the normally open valve Vl, and
ci rculating storage water through heat pump evaporator HX2. Tis mode is terminated wner either the sensed storage temperature rises above 90'F, or when no soace heating demand exists.


S PERFORMERS CE EVALUATION


The system performance evaluations discussed in this section are based primarily on the analysis of the data presented in the attached computergenerated monthly report. This attached report consists of daily site thermal and e-ergy values for each subsystem, plus environmental data. The performance factors discussed in this report are based upon the definitions
contained in 'BSIR-76-1137, Thermal Data Requirements and Per'ormance Evaluation Procedures for the national Solar Heating and Cooling Demonstration Program.


A. Introduction


The solar energy system at the T. D. Moseley site was operational throughout March, and satisfied 49 percent of the space heating energy requirements. The solar energy system saved 4.Z4 millionn Btu of Iossil fuel energy, at the expense of 0.71 million ztu oF electrical operating energy.







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Space Heating Lcad The space heating load for March was calculated to be
5.57 million Btu. Solar energy satisfied 49 percent of the heating load. The subsystem operated in Mode 2 throughout the month when space heating was required. Auxiliary thermal energy was supplied to the space heating subsystem via the storage tank through the operation of t e auxiliary heater. The electrical energy needed to operate pumps P2 and P3, and the blower Bl amounted to 0.64 million Btu.


D. Observations


For the month of March, 20 percent more thermal energy was delivered to the space heating load, as measured at heat exchanger HXI, than was measured leaving storage. This result was apparently caused by diversion of a portion of the total heat exchanger HXI flow, as measured by sensor W400, through valve V2. 'the reduced flow through heat exchanger HXI resulted in an increased temperature dIflerence (T401-T451) which caused the calculation of the space heating load parameter at heat exchanger HX1 to be invalid. Therefore, the space heating load calculation for tlarch was made from temperature measurements made at the output of storage. Because of this alternate calculation, any energy losses from piping between storage and heat exchanger HX1 are included in the building space heating load calculation, but-, do not actually enter the conditioned space. The significance of these losses cannot be determined until the simultaneous flow through valves Vl and V2 ceases.


During the operation of circulating pump P3, the flow, as measured by sensor W210, was determined to be 14 percent high due to a measurement bias. A correction factor was introduced into the performance equation when computing the auxiliary thermal energy to storage parameter for this report period.


E. Energy Savings


The T. D. Moseley solar energy system provided savings of 4.54 million Btu of natural gas during March, at the expense of 0.71 million Btu of




5










eCeCtriitY fOr cOperatin: the sclar portion of the system. The savings : illr B3u are tne natural gas equivalent of the 2.72 million :.t. :- tear :j re-ewed from storage and supplied to the conditioned ie. 're !,rin efivineny of tre natural gas boiler used in the f*ssi fUel savings Calculations was assumed to be 0.60.





^.s:i.;atinr of tre sir1ltaneous flow condition through valves Vl and ,.as n:~i: on 'carh 27 witn the site contractor. It is believed ta: u'trol logi, reaining from a previous control scheme, caused iaie to :en whenever second stage thermostat space heating require~erts existed.


site visit will be scheduled in April to correct the erroneous flow indication fro, flow sensor W210.















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