Monthly performance report

MISSING IMAGE

Material Information

Title:
Monthly performance report Rademaker Corporation
Added title page title:
Rademaker Corporation
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 -- Kentucky -- Louisville   ( lcsh )
Solar water heaters   ( lcsh )
Solar heating   ( lcsh )
Genre:
federal government publication   ( marcgt )
non-fiction   ( marcgt )

Notes

General Note:
National solar data program.
General Note:
Monthly Catalog Number: gp 80010083
General Note:
National solar heating and cooling demonstration program.
General Note:
"SOLAR/2009-79/03" ; "SOLAR/2009-79/04" ; "SOLAR/2009-79-05."

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 027069592
oclc - 05957200
System ID:
AA00013847:00003

Table of Contents
    Front Cover
        Page i
        Page ii
    I. System description
        Page 1
        Page 2
        Page 3
        Page 4
        Page 5
    II. Performance evaluation
        Page 6
        Page 7
        Page 8
        Page 9
    III. Action status
        Page 10
        Page 11
        Page 12
        Page 13
        Page 14
        Page 15
        Page 16
        Page 17
        Page 18
        Page 19
        Page 20
        Page 21
        Page 22
        Page 23
        Page 24
        Page 25
        Page 26
        Page 27
        Page 28
    Back Cover
        Page 29
        Page 30
Full Text



SOLAR/2009-79/04


Monthly Performance Report


RADEMAKER CORPORATION
APRIL 1979












SU.S. Department of Energy

National Solar Heating and
Cooling Demonstration Program

National Solar Data Program
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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
RADEMAKER CORPORATION
APRIL 1979

I. SYSTEM DESCRIPTION

The solar energy heating system at Rademaker Corporation is designed to provide 50 percent of the space heating and 50 percent of the domestic hot water preheating for a 10,000-square foot office and warehouse building in Louisville, Kentucky. The solar installation, by design, consists of two separate solar energy systems. One system utilizes liquid as the energy transfer medium; the other system utilizes air as the transfer medium. The purpose of separate solar energy systems was to evaluate the merits of each system in meeting a common space heating load. The two solar heating systems are shown schematically in Figure 1.


The liquid system has an array of six flat-plate collectors with a gross area of 240 square feet. The array faces south at an angle of 53 degrees from the horizontal. A solution of 46 percent propylene glycol and 54 percent water is employed as a heat transfer medium. Solar energy is stored in a 560-gallon thermal storage tank located in the warehouse. Solar energy is transferred to meet the space heating demand by two methods. In the first method, solar heated hot water is circulated on demand, from water thermal storage to heat exchangers HX2 and HX3 in the supply ducts of the drafting room and perimeter zone, respectively. In the second method, the glycol and water solution in the collection loop is directed, on demand, to heat exchanger HX4 in the supply duct of the perimeter zone. Circulation fans F2 and F3 distribute the solar energy to meet the space heating loads. Energy is also distributed to a domestic hot water heat exchanger that extracts solar energy from the glycol and water solution to preheat domestic hot water in the building.


The air system has an array of 10 flat-plate collectors with a gross area of 195 square feet. The array faces south at an angle of 33 degrees







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from the horizontal. Solar energy is stored in two rock thermal storage units in the warehouse which contain a total of 236 cubic feet of crushed rock. Solar energy is transferred to meet the perimeter, warehouse, and interior zone space heating demands using circulation fan Fl. Circulation fans F3 and F4 distribute energy to the perimeter and interior zones, respectively. Solar heated air can be distributed directly from the collectors, or from rock thermal storage to meet the space heating loads. The solar energy control system determines which space heating load received solar energy when a demand exists. The solar space heating load priorities are: first, interior zone heating; second, perimeter zone heating; and third, warehouse heating.

Solar heated air from the liquid system is mixed in the air-handling unit plenum with solar heated air from the air system and distributed to the perimeter zone using circulation fan F3. When solar energy is inadequate to provide perimeter zone space heating, auxiliary thermal energy is supplied by a natural-gas furnace.


The liquid system has four modes of operation.


Mode 1 Collector-to-Storage: This mode is entered when the difference between the collector outlet temperature and the water thermal storage temperature is greater than 14'F. Pump Pl circulates the liquid through the collectors, then to storage heat exchanger HX1 and returns to the collectors. Circulation continues in this mode until the temperature difference between the collector outlet and storage is less than 4*F.

Mode 2 Storage-to-Conditioned Space: This mode is entered when two conditions are satisfied: first, a demand for space heating exists; secondly, the temperature of the storage water is above 85'F. Water is circulated from storage to heat exchangers HX2 and HX3 located in the supply ducts of the drafting room and perimeter zone. Air circulation fans F2 and F3 distribute the solar energy to the space heating zones. This mode continues until the storage temperature is below 85'F or the demand for space heating is satisfied.






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Mode 3 Collector-to-Conditioned Space: This mode is entered when two conditions are satisfied: first, the temperature of the liquid at the outlet side of heat exchanger HXl is greater than 1200F; secondly, there is a demand for space heating from the perimeter zone. Solar energy is directed by valve V4 to heat exchanger HX4 in the supply duct of the perimeter zone. Fan F3 distributes the solar energy to the perimeter zone. This mode continues until either the temperature at the outlet of heat exchanger HX1 is less than 120*F, or the demand for space heating is satisfied. Auxiliary space heating supplements solar energy for the perimeter zone.

Mode 4 Domestic Hot Water Preheating: This mode is entered when solar hot water heating is desired and solar energy is available from the collectors. Solar energy is directed from the collector loop through the domestic hot water (DHW) recirculation loop to preheat hot water for DHW consumption. A high limit thermostat shuts off the flow to the DHW heat exchanger in the recirculation loop when the liquid temperature exceeds 1800 F.


The air system has four modes of operation.


Mode 5 Auxiliary Space Heating: This mode is entered when the collectors are inactive, the storage temperatures of both solar systems are below 850F, and a demand for space heating exists. Circulation fan F3 supplies auxiliary energy from the furnace to the perimeter zone. Circulation continues in this mode until the demand for space heating is satisfied or solar energy is available from either the collectors or storage.

Mode 6 Collector-to-Storage: This mode is entered when two conditions are satisfied: first, the difference between the collector outlet temperature and the bottom of storage is greater than 140F; secondly, there is no demand for space heating. Fan Fl circulates air from storage, through the collectors, and then back to storage. Circulation continues in this mode until the differential temperature is less than 40F. or until a demand for space heating occurs. In this mode, motorized dampers






4 4264







Dl, D31 D5, D6, D7 and D8 are closed, and motorized dampers D2 and D4 are opened.

Mode 7 Storage-to-Conditioned Space: This mode is entered when a demand for heating exists, the collector loop is inactive, and the top of rock thermal storage is above 85*F. Fan Fl circulates building return air through storage and supplies solar heated air to the space heating zone demanding heat. The solar control system determines which space heating zone is supplied with heat. Circulation continues in this mode until the storage temperature drops below 850F, or the demand for space heating ceases. In this mode, motorized dampers Dl. D55 D6 and D7 are opened, or closed, depending upon which area requires heat. For proper air circulation through storage, dampers D2 and D4 are closed, and D3 is opened.


Mode 8 Collector-to-Conditioned Space: This mode is entered when two conditions are satisfied: first, a demand for space heating exists from the perimeter zone, interior zone, or warehouse; secondly, the differential temperature between the collector outlet and the bottom of rock thermal storage is greater than 14*F. Fan Fl circulates air from conditioned space through the collectors and supplies solar heated air to area demanding heat. The solar control system has a priority scheme that determines the order in which zone is supplied heat. Fans F3 and F4 assist in the air distribution. This mode continues until either the differential temperature between the collector outlet and the bottom of storage is less than 4*F, or the demand for space heating ceases. The auxiliary furnace supplements solar energy for the perimeter zone only. In this mode, motorized dampers DI, D5t D6 and D7 are either opened, or closed, as determined by heating requirements. To circulate air only through the collectors, motorized dampers D3, D4 and D8 are closed, and Jumper D2 is opened.

The liquid system and the air system operate independently; however, either system may be used in conjunction with the auxiliary furance to satisfy a heating demand.






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II. PERFORMANCE 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 energy values for each subsystem, plus environmental data. The performance factors discussed in this report are based upon the definitions contained in NBSIR 76-1137, Thermal Data Requirements and Performance Evaluations Procedures for the National Solar Heating and Cooling Demonstration Program.

A. Introduction


In the month of April, the load was predominantly space heating and equally shared between the liquid and the air systems.


During April, 63 percent of the 5.38 million Btu space heating system load was provided by solar energy, resulting in a fossil energy savings of 8.17 million Btu at an electrical energy cost of 0.56 million Btu.


For the air system, 62 percent of the 2.69 million Btu system load was provided by solar energy, resulting in a fossil energy savings of 3.37 million Btu at an electrical energy cost of 0.30 million Btu. The energy collection and storage subsystem and the space heating subsystem were operational during the entire month.


For the liquid system, 64 percent of the 2.69 million Btu space heating system load was provided by solar energy, resulting in a fossil energy savings of 3.51 million Btu at an electrical energy cost of 0.26 million Btu. The energy collection and storage subsystem, the space heating subsystem, and the DHW preheating subsystem were operational during the entire month.










6 4264







B. Weather

During April, the temperature in Louisville, Kentucky was cooler than normal, as evidenced by an average outside ambient temperature of 54*F when compared to the long-term value of 56*F. This long-term value was obtained from the climatological data for the city of Louisville, Kentucky.


The average insulation of 1,301 Btu/ft 2_ day was less than the long-term value of 1,363 Btu/ft 2_ day, obtained from an algorithm that projects the mean daily horizontal insulation into the plane of the collectors.


C. Thermal Performance (Liquid System)


Collector During April, 9.37 million Btu of solar energy were incident upon the collector array, and 8.34 million Btu were incident during the operation of the subsystem. From this amount, 3.12 million Btu were collected, resulting in a collector array efficiency of 33 percent. A total of 1.18 million Btu of electrical energy was required to operate the subsystem.


Storage From the 3.12 million Btu of solar energy that were collected,
0.64 million Btu were delivered to the DHW preheating subsystem, 2.08 million Btu were delivered to thermal storage, and the remaining 0.40 million Btu were lost during transport. From storage, 0.12 million Btu were removed from the space heating subsystem and 0.42 million Btu were lost to the warehouse, resulting in a storage efficiency of 0.80 percent. The average storage temperature was 91'F.


Space Heating A total of 1.72 million Btu of solar energy was delivered to the subsystem. Of the total auxiliary energy used (2.0 million Btu), 0.97 million Btu of thermal energy were apportioned to the liquid system.










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A total of 1.02 million Btu of electrical energy was required to operate the subsystem, including the apportioned furnace air handler blower power. Solar energy supplied 64 percent of the 2.69 million Btu subsystem load, resulting in a fossil energy savings of 3.51 million Btu, at an electrical energy cost of 0.10 million Btu.

Domestic Hot Water The DHW subsystem is instrumented to identify the energy extracted from the collected energy and delivered to the DHW recirculation loop. The operating energy and the energy used by the DHW load cannot be identified. The solar energy delivered to the subsystem was 0.67 million Btu.

D. Thermal Performance (Air System)

Collector During April, 7.98 million Btu of solar energy were incident upon the collector array, and 7.54 million Btu were incident during the operation of the subsystem. From the incident energy, a net amount of
2.19 million Btu was collected.

The collector array efficiency was 28 percent. A total of 0.30 million Btu of electrical energy was required to operate the subsystem.

Storage From the net amount of 2.19 million Btu of solar energy that was collected, 0.81 million Btu were delivered to storage, and the remainder was delivered directly to the space heating load or lost in transport.

The net energy from storage was 0.40 million Btu and the storage efficiency was 55 percent. The average daily storage tank temperature was 73*F which is below the 85'F set point for storage-to-conditioned space operation (Mode 7).

Space Heating Subsystem A total of 2.69 million Btu of solar energy was delivered to the subsystem. Of the total auxiliary energy used (2.0 mil8 4264







lion Btu), 1.03 million Btu of thermal energy were apportioned to the air system. A total of 0.56 million Btu of electrical energy was required to operate the subsystem, including the apportioned furnace air handler blower power. Solar energy supplied 62 percent of the 2.69 million Btu subsystem load, resulting in a fossil energy savings of 3.37 million Btu, and electrical energy savings which were negligible.

E. Thermal Performance (Combined Systems)

The thermal performance of the combined liquid and air systems includes the solar energy extracted from the liquid collector loop for use by the DHW subsystem in the calculation for fossil savings and solar fraction. It has not been included in the total load or solar energy used because the auxiliary DHW energy is unknown. Accordingly, the solar fraction of the overall system is high because the missing auxiliary energy factor which, as a nominal part of the total load, is in the denominator of the solar fraction expression. The Rademaker DHW load is estimated to be 10 percent or less of the heating load and, therefore, this effect is not great.

A total of 5.38 million Btu of solar energy was delivered to the space heating subsystems and 0.64 million Btu were delivered to the DHW preheating subsystem. From the 4.80 million Btu of fossil energy available to the furnace, 2.0 million Btu of thermal energy were delivered to heat exchanger HX5. A total of 2.05 million Btu of electrical energy was required to operate the system. The solar fraction was 6.3 percent. The solar energy used resulted in fossil energy savings of 8.17 million Btu, at an electrical energy cost of 0.56 million Btu.

F. Observations

There is no change in the nature of spurious air flow due to the malfunction of damper DI previously reported. The effect is not as pronounced as in previous winter months because of the lower heating load. The auxiliary storage tank in the air system is completely ineffectual and should not be used in the system.






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G. Energy Savings


During April, the combined system fossil energy savings including the solar contribution to the DHW Subsystem, were 8.17 million Btu. These savings are based on a furnace efficiency of 0.60 in the conversion of fossil energy to usable thermal energy. The electrical energy savings were 0.56 million Btu which is the equivalent operating energy that would have been required to satisfy the observed monthly load by the gas furnace less the operating energy that was used.


The following percentage of time in the month of April that the air system operated in the solar mode and the total system operated in the non-solar modes is listed:


No Solar Operation 15.5 Percent
Solar Operation 39.0 Percent
Auxiliary Heating Only 5.8 Percent
Ventilating Only 39.7 Percent


During solar operation, the air system had the following breakdown of time duration:


Collector-to-Load 9.4 Percent
Storage-to-Load 3.8 Percent
Collector-to-Storage 25.8 Percent


III. ACTION STATUS

The site contractor has an open action item to correct the damper leaks and the control of damper Dl which now opens when there is a demand for heating regardless of whether solar energy is available. It has also been recommended to the site contractor that the 158-cubic foot rock thermal storage be completely disabled.








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