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Group Title: Computer series Florida Cooperative Extension Service
Title: GREENHOUSE
CITATION THUMBNAILS PAGE IMAGE ZOOMABLE
Full Citation
STANDARD VIEW MARC VIEW
Permanent Link: http://ufdc.ufl.edu/UF00095248/00002
 Material Information
Title: GREENHOUSE Estimation of Greenhouse heat losses
Series Title: Computer series Florida Cooperative Extension Service
Alternate Title: Estimation of greenhouse heat losses
Greenhouse heat losses
Physical Description: 1 computer disk : ; 5 1/4 in. +
Language: zxx
English
Creator: Panagakis, P. B.
Zazueta, Fedro S. ( Fedro S )
Bucklin, R. A
Florida Cooperative Extension Service
Publisher: Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 1988
Copyright Date: 1988
Edition: Version 1.0.
 Subjects
Subject: Greenhouses -- Heating and ventilation   ( lcsh )
GREENHOUSE (Computer program)   ( lcsh )
 Notes
Summary: This program allows the computation of conduction, infiltration and total heat losses from certain types of greenhouses.
Statement of Responsibility: P.B. Panagakis, F.S. Zazueta and R.A. Bucklin.
System Details: System requirements: IBM PC or compatible with MS-DOS.
General Note: Description based on: documentation dated March 1988.
General Note: Title on disk label: Greenhouse heat losses.
General Note: Florida Cooperative Extension Service, computer series circular 772
 Record Information
Bibliographic ID: UF00095248
Volume ID: VID00002
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 20697910

Table of Contents
    Front Cover
        Front Cover 1
        Front Cover 2
    Main
        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
        Page 17
        Page 18
        Page 19
        Page 20
        Page 21
        Page 22
        Page 23
        Page 24
        Page 25
        Page 26
        Page 27
        Page 28
        Page 29
        Page 30
        Page 31
        Page 32
    Back Cover
        Page 33
        Page 34
Full Text
oMarch 1988

March 1988


Floppy disc included with this
item has been shelved separately.
Consult LUIS or ask circulation
staff for assistance.


Circular 772


GREENHOUSE

Estimation of Greenhouse Heat Losses


COMPUTER SERIES I


P.B. Panagakis, F.S. Zazueta and R.A. Bucklin


Centra! Science
Library
JAN 30 1990
I' ty of Florida


W m

PFUS


101 active Extension Service / Institute of Food and Agricultural Sciences / University of Florida / John T. Woete, Dean
F636c
772
codebk














GREENHOUSE


Estimation of Greenhouse Heat Losses



P.B. Panagakis, F.S. Zazueta and R.A. Bucklin*































* Graduate Assistant, Associate and Assistant Professors
respectively, Department of Agricultural Engineering Institute
of Food and Agricultural Sciences, University of Florida,
Gainesville 32611.








Estimation of Greenhouse Heat Losses

P.B. Panagakis, F.S. Zazueta and R.A. Bucklin


Introduction

Energy expenditure for greenhouse heating becomes critical
because of the instability in prices and availability of fossil
fuels. Heating represents the largest energy expense in
traditional greenhouse operations and the required amount of
money depends on the climate, the condition of the structure and
the crops grown.
The first step in an energy conservation program in
greenhouses, is to make an estimate of the heat losses from the
entire structure. If the estimated losses are large, conserva-
tion techniques can be used to reduce them.
This program, GREENHOUSE, allows the computation of
conduction, infiltration and total heat losses from the following
types of greenhouses:

1) Gable or curved greenhouses using one material for the
wall.

2) Gable or curved greenhouses using different materials
for the lower and upper wall.

3) Quonset greenhouses.


Input Data

The required input data vary slightly with the type of
greenhouse for which the heat losses are being estimated. For
each one of the three types mentioned above the input data are as
follows

1) Gable/curved greenhouse using a single material for the wall.

The required data to estimate the heat losses in this type
of greenhouse (Figure 1) are:

1.1) Wall height (H): This is the height of the greenhouse
wall in feet.

1.2) House width (W): This is the width of the greenhouse
in feet.

1.3) House length (L): This is the length of the greenhouse
in feet.

1.4) Rafter length (R): This is the length of the rafter in
feet.








1.5) Gable height (G): This the height of the gable in
feet.

1.6) U factor of single material wall: This is the heat
transfer coefficient of the wall's material in
BTU/hr.F ft2. Values of this coefficient for typical
materials are shown in Table 1.

1.7) U factor of rafter material: This is the heat transfer
coefficient of the rafter's material in BTU/hr F ft2.
Values of this coefficient for typical materials are
shown in Table 1.

1.8) U factor of roof material: This is the heat transfer
coefficient of the roof's material in BTU/hr F ft2.
Values of this coefficient for typical materials are
shown in Table 1.

1.9) U factor of the perimeter: .This is the heat transfer
coefficient of the perimeter in BTU/hr F ft. Values of
this coefficient are shown in Table 1.

1.10) Number of individual bays: This is the number of
bays that make up the greenhouse.

1.11) Number of air exchanges per hour: This is the number
of times that the volume of air in the greenhouse is
replaced per hour. Typical values can be seen in
Table 2.

1.12) Temperature difference: This is the difference between
the nightime desired inside temperature and the minimum
expected outside temperature. This value is given in
degrees Fahrenheit.

2) Gable/curved greenhouse using different material for the
lower and upper wall.

The required data to estimate the heat losses in this type
of greenhouse (Figure 2) are:

2.1) Wall height (H): This is the height of the greenhouse
wall in feet.

2.2) Lower wall height (B): This is the height of the lower
wall in feet.

2.3) Upper wall height (A): This is the height of the upper
wall in feet.









2.4) House width (W): This is the width of the greenhouse
in feet.

2.5) House length (L): This is the length of the greenhouse
in feet.

2.6) Rafter length (R): This is the length of the rafter in
feet.

2.7) Gable height (G): This is the height of the gable in
feet.

2.8) U factor of lower wall material: This is the heat
transfer coefficient of the lower wall's material in
BTU/hr F ft2. Values of this coefficient for typical
materials are shown in Table 1.

2.9) U factor of upper wall material: This is the heat
transfer coefficient of the upper wall's material in
BTU/hr F ft2. Values of this coefficient for typical
materials are shown in Table 1.

2.10) U factor of rafter material: This is the heat transfer
coefficient of the rafter's material in BTU/hr F ft2.
Values of this coefficient for typical materials are
shown in Table 1.

2.11) U factor of roof material: This is the heat transfer
coefficient of the roof's material in BTU/hr F ft2.
Values of this coefficient for typical materials are
shown in Table 1.

2.12) U factor of the perimeter: This is the heat transfer
coefficient of the perimeter in BTU/hr F ft. Values of
this coefficient are shown in Table 1.

2.13) Number of individual bays: This is the number of bays
that make up the greenhouse.

2.14) Number of air exchanges per hour: This is the number
of times that the volume of air in the greenhouse is
replaced per hour. Typical values can be seen in
Table 2.

2.15) Temperature difference: This is the difference between
the nightime inside desired temperature and the minimum
expected outside temperature. This value is given in
degrees Fahrenheit.








3) Quonset greenhouse.

The required data to estimate the heat losses in this type
of greenhouse (Figure 3) are:

3.1) House width (W): This is the width of the greenhouse
in feet.

3.2) House length (L): This is the length of the greenhouse
in feet.

3.3) Rafter length (R): This is the length of the rafter in
feet.

3.4) Gable height (G): This is the height of the gable in
feet.

3.5) U factor of rafter material: This is the heat transfer
coeffici-ent of the rafter's material in BTU/hr F ft2.
Values of this coefficient for typical materials are
shown in Table 1.

3.6) U factor of roof material: This is the heat transfer
coefficient of the roof's material in BTu/hr F ft2.
Values of this coefficient for typical materials are
shown in Table 1.

3.7) U factor of the perimeter: This is the heat transfer
coefficient of the perimeter material in BTU/hr F ft2.
Values of this coefficient are shown in Table 1.

3.8) Number of air exchanges per hour: This is the number
of times that the volume of air in the greenhouse is
replaced per hour. Typical values can be seen in
Table 2.

3.9) Temperature difference: This is the difference between
the nightime inside desired temperature and the minimum
expected outside temperature. This value is given in
degrees Fahrenheit.

Output

The results of the program consist of the computed values
of conduction, infiltration, and total heat losses. Results are
expressed in BTU/hr.
Conduction may be viewed as "the transfer of energy from the
more energetic to the less energetic particles of a substance due
to interaction between the particles" (Incropera and DeWitt,
1981).
In the case of the greenhouse conduction heat losses are due
to the difference between inside and outside temperature. These








losses are proportional to the surface area of the greenhouse,
the heat transfer coefficient of the greenhouse material and the
perimeter, and the difference between inside and outside
temperature.
Infiltration is the exchange of inside and outside air. The
rate of infiltration depends upon the direction and the speed of
the wind, the difference between inside and outside temperature,
and the type and quality of the greenhouse construction.

Technical Notes

A practical method to compute the total heat losses from a
greenhouse is to add the conduction and infiltration heat losses.
Conduction heat losses can be computed using the conduction
heat transfer equation.
Qc = A U Dt (1)
where
Qc = Heat transfer through the material in BTU/hr,
A = Exposed surface area in ft2,
U = Heat transmission coefficient in BTU/hr F ft2,
Dt = Temperature difference between inside and outside
in degrees Fahrenheit.

Infiltration heat losses can be computed using the formula:

Qa = 0.02 Dt V Na (2)
where
Qa = Air infiltration heat losses in BTU/hr,
Dt = Temperature difference between inside and outside
in degrees Fahrenheit,
V = Volume of the greenhouse in ft3, and
Na = Number of air volumes exchanged per hour.

Total heat losses from the greenhouse are obtained by
summing conduction and infiltration heat losses.
Qt = Qc + Qa (3)
where
Qt = total heat losses in BTU/hr.
Sample Run

The following is a step-by-step example of how to use this
software to estimate the heat losses from different greenhouse
types.

1. To run the program place the disk that contains the
GREENHOUSE.COM file in Drive A.









2. Type GREENHOUSE . If the banner shown in CRT 1
is displayed the program has loaded successfully. If the message
"Bad command or file name" is displayed you do not have the disk
with the GREENHOUSE program in Drive A (default drive).

3. After a while the screen will display a mask as is shown
in CRT 2. At the point where the cursor is blinking enter the
selection.

4a) If the entered selection is 1, the screen will show an
input/output mask as shown in CRT 3. Enter the corresponding
data on each of the fields (see Appendix A) that are shown in
Table A.

Table A

Wall Height: 8.0 ft
House Width: 40.0 ft
House Length: 96.0 ft
Rafter Length: 22.4 ft
Gable Height: 10.0 ft
U Factor Of Single Material Wall: 1.1 BTU/hr. F ft2
U Factor Of Rafter Material: 1.1 BTU/hr. F ft2
U Factor Of Roof Material: 1.1 BTU/hr. F ft2
U Factor Of Perimeter: 0.8 BTU/hr. F ft
Number Of Individual Houses: 1
Number Of Air Exchanges Per Hour: 1.5
Temperature Difference: 60.0 F
-----------------------------------------------------
Once the last datum has been entered press the key.
A mask as shown in CRT 4 will be displayed.
i) Typing Y the computations will be performed and a mask
as shown in CRT will be displayed on the screen. At the point
where the cursor is blinking you can enter Y or N. Entering Y
the MAIN MENU will be displayed. Entering N sends the cursor to
the first input field and new data can be entered.
ii) Typing N sends the cursor to the last input field.

4b) If the entered selection is 2, the screen will show an
input/output mask as shown in CRT 6. Enter the corresponding
data on each of the fields (see Appendix A) that are shown in
Table B.
Once the last datum has been entered and there are no
mistakes press the key. A mask as shown in CRT 7 will be
displayed.
i) Typing N the computations will be performed and a mask
as shown in CRT 8 will be displayed on the screen. At
the point where the cursor is blinking you can enter Y
or N. Entering Y the MAIN MENU will be displayed.
Entering N sends the cursor to the first input field
and new dTta can be entered.
ii) Typing N sends the cursor to the last input field.








4c) If the entered selection is 3, the screen will show an
input/output mask as shown in CRT 9. Enter the corresponding
data on each of the fields (see Appendix A) that are shown in
Table C.
Once the last datum has been entered and there are no
mistakes press the key. A mask as shown in CRT 10 will be
displayed.
i) Typing Y the computations will be performed and a mask
as shown in CRT 11 will be displayed on the screen. At
the point where the cursor is blinking you can enter Y
or N. Entering Y the MAIN MENU will be displayed.
Entering N sends the cursor to the first input field
and new data can be entered.
ii) Typing N sends the cursor to the last input field.


Table B
Wall Height: 8.0 ft
Lower Wall Height: 2.0 ft
Upper Wall Height: 6.0 ft

House Width: 40.0 ft
House Length: 96.0 ft
Rafter Length: 22.4 ft
Gable Height: 10.0 ft
U Factor Of Lower Wall Material: 1.1 BTU/hr. F ft2
U Factor Of Upper Wall Material: 1.1 BTU/hr. F ft2
U Factor Of Rafter Material: 1.1 BTU/hr. F ft2
U Factor Of Roof Material: 1.1 BTU/hr. F ft2
U Factor Of Perimeter: 0.8 BTU/hr. F ft
Number Of Individual Houses: 1
Number Of Air Exchanges Per Hour: 1.5
Temperature Difference: 60.0 F



Table C

Wall Height: 8.0 ft
House Width: 40.0 ft
House Length: 96.0 ft
Rafter Length: 44.9 ft
Gable Height: 3.0 ft
U Factor of Lower Wall Material: 1.1 BTU/hr. F ft2
U Factor of Upper Wall Material: 1.1 BTU/hr. F ft2
U Factor Of Roof Material: 1.1 BTU/hr. F ft2
U Factor Of Perimeter: 0.8 BTU/hr. F ft
Number Of Individual Houses: 1
Number Of Air Exchanges Per Hour: 1.5
Temperature Difference: 60.0 F









4d) If the entered selection is 4, the screen will show an
input/output mask as shown in CRT 12. Enter the corresponding
data on each of the fields (see Appendix A) that are shown in
Table D.
Once the last datum has been entered and there are no
mistakes press the key. A mask as shown in CRT 13 will be
displayed.
i) Typing Y the computations will be performed and a mask
as shown in CRT 14 will be displayed on the screen. At the point
where the cursor is blinking you can enter Y or N. Entering Y
the MAIN MENU will be displayed. Entering N sends the cursor to
the first input field and new data can be entered.
ii) Typing N sends the cursor to the last input field.
------------------------------------------------------
Table D
Wall Height: 8.0 ft
Lower Wall Height: 2.0 ft
Upper Wall Height: 6.0 ft

House Width: 40.0 ft
House Length: 96.0 ft
Rafter Length: 44.9 ft
Gable Height: 3.0 ft
U Factor Of Lower Wall Material: 1.1 BTU/hr. F ft2
U Factor Of Upper Wall Material: 1.1 BTU/hr. F ft2
U Factor Of Rafter Material: 1.1 BTU/hr. F ft2
U Factor Of Roof Material: 1.1 BTU/hr. F ft2
U Factor Of Perimeter: 0.8 BTU/hr. F ft
Number Of Individual Houses: 1
Number Of Air Exchanges Per Hour: 1.5
Temperature Difference: 60.0 F
----------------------------------------------------

4e) If the entered selection is 5, the screen will show an
input/output mask as shown in CRT 15. Enter the corresponding
data on each of the fields (see Appendix A) that are shown in
Table E.
------------------------------------------------------
Table E
------------------------------------------------------
House Width: 40.0 ft
House Length: 96.0 ft
Rafter Length: 49.7 ft
Gable Height: 10.0 ft
U Factor Of Rafter Material: 1.1 BTU/hr. F ft2
U Factor Of Roof Material: 1.1 BTU/hr. F ft2
U Factor Of Perimeter: 0.8 BTU/hr. F ft
Number Of Air Exchanges Per Hour: 1.5
Temperature Difference: 60.0 F
-------------------------------------------








Once the last datum has been entered and there are no
mistakes press the key. A mask as shown in CRT 16 will be
displayed.
i) Typing Y the computations will be performed and a mask
as shown in CRT 17 will be displayed on the screen. At the point
where the cursor is blinking you can enter Y or N. Entering Y
the MAIN MENU will be displayed. Entering N sends the cursor to
the first input field and new data can be entered.
ii) Typing N sends the cursor to the last input field.

4f) If the entered selection is 6, the display will be
cleared and control will be returned to the Operating System.

Appendix A
This appendix contains a brief description of how to enter
and edit data.

i. The fields where you can enter your data are denoted
with blue color.

ii. Within the field you can move either to the right using
the <-- > key or to the.left using the <<--> key.
iii. If upon entering your data you detect an error:

a) Press the key to erase the character at the
cursor position or

b) Press the key to erase the character
at the left of the cursor position.

iv. Entering the data you might use the key. If you
press it once a message "Typeover" wT-~Te displayed at
the bottom of the screen and you will be able to enter
any character at the position of the cursor (if any
character is already written in this position it will
be automatically deleted). If you press the key
twice, a message "Insert" will be displayed at the
bottom of the screen and you will be able to insert a
character at the cursor position without deleting the
character which might have existed there.

v. If any of the number values are not acceptable by the
program a message "Value out of range,accept?" will be
displayed at the bottom of the screen. You have to
press N in order to reenter the value.

vi. After entering the data into a field you can move to
the next field pressing the key or the < 4/ >
key. If you want to go back to the previous field
press the < + > key.








References


1. NRAES-3, 1978.
Greenhouses. NRAES -
Engineering Service,


Energy Conservation and Solar Heating
3. Northeast Regional Agricultural
Ithaca, N.Y.


2. Incropera, F. P. and D.P. DeWitt, 1981. Fundamentals of
Heat Transfer, John Wiley & Sons., Inc. New York.

































R


H


J W


W HOUSE WIDTH

L : HOUSE LENGTH

H : HOUSE HEIGHT

R = RAFTER
LENGTH

G GABLE HEIGHT


(b)


FIGURE I1 (a) CURVED GREENHOUSE USING ONE MATERIAL
FOR THE WALL.

(b) GABLE GREENHOUSE USING ONE MATERIAL FOR
THE WALL.


r


L





































--
H




(b)


W : HOUSE WIDTH

L : HOUSE LENGTH

H : HOUSE HEIGHT

R RAFTER
LENGTH

G GABLE HEIGHT

A : UPPER WALL
HEIGHT

B : LOWER WALL
HEIGHT


FIGURE 2: (a) CURVED GREENHOUSE USING DIFFERENT MATERIALS
FOR THE LOWER AND UPPER WALLS.

(b) GABLE GREENHOUSE USING DIFFERENT MATERIALS
FOR THE LOWER AND UPPER WALLS.


























W- HOUSE WIDTH

L HOUSE LENGTH

R : RAFTER
LENGTH
G : GABLE HEIGHT

FIGURE 3' QUONSET GREENHOUSE.













Table 1: U Values for various Construction Materials


U Values,BTU/hrF ft2


Roof and wall coverings


Glass,single layer
Glass,double layer,1/4" space
Glass,triple layer,1/4" space
Polyethylene film,single layer
Polyethylene film,double layer
(separated)
Fiberglass reinforced panel

Wall Materials

Concrete block,8"
Cement asbestos board,1/4"
Concrete ,poured ,6"
Soft wood,1" nominal

Greenhouses with thin thermal
blankets


Perimeter

Uninsulated
Insulated


1.1
0.7
0.5
1.1
0.1

1.0


0.5
1.1
0.8
0.6


0.4_ 0.5

BTU/hr F ft


0.8
0.4


Notice: The roof and wall materials that are most used
(in Florida) are Polyethylene (double layer) and
Fiberglass.


Material








Table 2: Air Exchange for Greenhouses


Construction System


Air Exchanges per hour


New construction, glass or fiber_
glass
New construction, double layer PE
Old construction,glass,good main_
tenance
Old constructionglass,poor main_
tenance


0.75 to 1.50

0.50 to 1.00

1.00 to 2.00

2.00 to 4.00





version i.UV


(ci ii7, iFAS

The institute of Food and Agricultural Sciences
of Florida and the authors of this software mak4
implicit warranties on the use of this software
ability for ail consequences of using this softwai
with the user.


, The University
e no explicit or
re.The responsi-
e remain solelyi


CRT I


INSTITUTE UF FUU HNU AGRICULTURAL SCItNi

Agricultural Engineering Department

University of Florida



Estimation of Greenhouse Heat Losses















Estimation of

Greenhouse Heat Losses


MAIN MENU


1. Gable Greenhouse Using One Material For The Wall.

2. Gable Greenhouse Using Different Materials For The Upper and Lower Wall.

3. Curved Greenhouse Using One Material For The Wall.

4. Curved Greenhouse Using Different Materials For The Upper and Lower Wall.

5. Quonset Greenhouse.

6. Exit to OPERATING SYSTEM.

Enter Selection:


CRT 2


I

















Gable Greenhouse Using One Material Fi


Green

Sail H
House
House
Raftei
Gable
U Fac
U Fac
U Fac
U Fac
Nuebe
Tempbe
Teape


house Characteristics


eight:
Width:
Length:
r Length:
Height:
tor Of Single Material Wall:
tor Of Rafter -Material:
tor Of Roof Material:
tor Of Perimeter:
r Of Individual Houses:
r Of Air Exchanges Per Hour:
rature Difference:


Final Results

Conduction Heat Losses:
Infiltration Heat Losses:
Total Heat Losses:
i*l


0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00


0.00 B
0.00 B
0.00 B


or The Wall



ft
ft
ft
ft
ft
BTU/hr F ft2
BTU/hr F ft2
BTU/hr F ft2
BTU/hr F ft


F


TU/hr
TU/hr
TU/hr


CRT 3
















Gable Greenhouse Using One Material For


house Characteristics


Green

Hall
House
House
Rafte
Gable
U Fac
U Fac
U Fac
U Fac
Nusbe
Nuabe
Tempe


Height:
Width:
Length:
r Length:
Height:
tor Of Single Material Wall:
tor Of Rafter Material:
tor Of Roof Material:
tor Of Perimeter:
r Of Individual Houses:
r Of Air Exchanges Per Hour:
rature Difference:


Final Results

Conduction Heat Losses:
Infiltration Heat Losses:
Total Heat Losses:


Exit edit mode?


8.00
40.00
96.00
22.40
10.00
1.10
1.10
1.10
0.80
I
1.50


ft


ft
ft
ft
ft
BTU/hr F ft2
BTU/hr F ft2
BTU/hr F ft2
BTU/hr F ft


F


0.00 BTU/hr
0.00 BTU/hr
0.00 BTU/hr


CRT 4


The Wall















e Greenhouse Using One Material Fi


Gabl

Greenhouse Ch1

Mall Height:
House Width:
House Length:
Rafter Length:
Gable Height:
U Factor Of Si
U Factor Of Ra
U Factor Of Ro
U Factor Of Pe
Number Of Indi
Number Of Air
Temperature Di


iracteristics


8.00
40.00
96.00
22.40
10.00
1.10
1.10
1.10
0.80
1
1.50
60.00


ingle Material Hall:
after Material:
>of Material:
riseter:
ividual Houses:
Exchanges Per Hour:
difference:


or The Hall



ft
ft
ft
ft
ft
BTU/hr F ft2
BTU/hr F ft2
BTU/hr F ft2
BTU/hr F ft


F


Final Results


Conduct
Infiltra
Total He


Return to a


on Heat Losses:
tion Heat Losses:
at Losses:


ain menu?


CRT 5


466924.80
89856.00
556780.80


BTU/hr
BTU/hr
BTU/hr
















Gable Greenhouse I

Greenhouse Charac


Using Different Materials For The Upper a

teristics


Wall Height:
Lower Wall Height:
Upper Wall Height:
House Width:
House Length:
Rafter Length:
Gable Height:
U Factor Of Lower Wall Material:
U Factor Of Upper Wail Material:
U Factor Of Rafter Material:
U Factor Of Roof Material:
U Factor Of Perimeter:
Number Of Individual Houses:
Number Of Air Exchanges Per Hour:
Temperature Difference:


Final Result
Conduction Hi
Infiltration
Total Heat L


0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0
0.00
00


0.00
0.00
0.00


s
eat Losses:
Heat Losses:
losses:


ft
ft
ft
ft
ft
ft
ft
BTU/hr F f
BTU/hr F f
BTU/hr F f
BTU!hr F f
BTU/hr F f


F


BTU/hr
BTU!/hr
DTUihr


CRT 6


I


nd Lower Wall











t2

t2
t2
t


-..-j
















Gable Greenhousi

Greenhouse Char:

Wall Height:
Lower Wall Heigt
Upper Wall Heigh
H unn Widrh:


House Length:
Rafter Length:
Gable Height:
U Factor Of Lo
U Factor Of Up
U Factor Of Ra
U Factor Of Ro
U Factor Of Pe
Number Of Indi
Number Of Air
Temperature Di

Final Results
SConduction Hea
Infiltration H
Total Heat Los
Exit Edit Mode?


WE
pe
ft
of
ri
vi
Ex
ff


e Using Different Materials For The Upp

acteristics


it:
it:




r Wall Material:
r Wall Material:
er Material:
Material:
meter:
dual Houses:
changes Per Hour:
erence:


8.00
2.00
6.00
40.00
96.00
22.40
10.00
1.10
1.10
1.10
1.10
0.30
1
1.50


60.0


t Losses:
eat Losses:
ses:


ft
ft
ft
ft
ft
ft
ft
BTU/hr
BTU/hr
BTU/hr
BTU/hr.
BTU/hr


er and Lower Wall











F ft2
F ft2
F ft2
F ft2
F ft


F


0.00 BTU/hr
0.00 BTU/hr
0.00 BTU/hr


CRT 7

















Gable Sreenhou

Greenhouse Cha

Wall Height:
House Width:
House Length:
Rafter Length:
Gable Height:
Lower Wall Hei
Upper Wall Hei
U Factor Of Ra
U Factor Of Ro
U Factor Of Pe
Number Of Indi
Number Of Air
Temperature Di


Final Results
Conduction He
Infiltration
Total Heat Lo
Return to Main M


se Using Different Materials For The Upper

racteristics


ght:
ght:
after Material:
of Material:
rimeter:
vidual Houses:
Exchanges Per Hour:
fference:


at Losses:
Heat Losses:
sses:
enu?


8.00
40.00
96.00
22.40
10.00
2.00
6.00
1.10
1.10
0.80
1
1.50
60.00


466924.80
89856.00
556780.80


ft
ft
ft
ft
ft
ft
ft
BTU/h
BTU/h
BTU/h


F


BTU/h
BTU/h
BTU/h


;r F
r F
r F


and Lower Wall











ft2
ft2
ft


r
r
r


CRT 8
















urved Greenhouse Using One Material For The W


Creenhouse I



Uall Height
House Width
House Lengt
Rafter Leng
Gable Heigh
U Factor Of
U Factor Of
U Factor Of
U Factor Of
Number Of Ii
Number Of A
Temperature


Characteristics


h:
th:
t:
Single Material Hall:
Rafter Material:
Roof Material:
Perimeter:
individual Houses:
ir Exchanges Per Hour:
Difference:


Final Results


Conduction Heat Losses:
Infiltration Heat Losses:
Total Heat Losses:


0.00 BTU/hr
0.00 BTU/hr
0.00 BTU/hr


CRT 9


0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00


ft
ft
ft
ft
ft
BTU/hr
BTU/hr
BTU/hr
BTU/hr


F


F ft2
F ft2
F ft2
F ft


all
















Curved Greenhouse Using One Material For The W


use Characteristics


Ireenho

Wall He
House U
House Li
Rafter
Sable Hi
U Facto
U Factor
U Facto
U Facto:
Number
Number
Tempera


ight:
idth:
length:
Length:
eight:
r Of Single Material Wall:
r Of Rafter Material:
r Of Roof Material:
r Of Perimeter:
Of Individual Houses:
Of Air Exchanges Per Hour:
ture Difference:


lf inal Kesult

Conduction He
Infiltration
Total Heat Lo


Exit edit mode?


eat Losses:
Heat Losses:
sses:


8.00
40.00
96.00
44.90
3.00
1.10
1.10
1.10
0.80
1
1.50


ft
ft
ft
ft
ft
BTU/hr F
BTU/hr F
BTU/hr F
BTU/hr F


0.00 BTU/hr
0.00 BTU/hr
0.00 BTU/hr
0.00 BTU/hr


CRT 10


25


all









ft2
ft2
ft2
ft


fee 1 1
.... L


s
















Curved Greenhouse Using One Material


Greenhour

Hall Heig
House Ui
House Len
Rafter Li
Gable Hei
U Factor
U Factor
U Factor
U Factor
Number 01
Number Of
Temperat:


se Characteristics


ht:
dth:
ngth:
length:
ght:
Of Single Material Wall:
Of Rafter Material:
Of Roof Material:
Of Perimeter:
f Individual Houses:
Air Exchanges Per Hour:
ure Difference:


Final Results


Conductio
Infiltrat
Total Hea


Return to ma


n Heat Losses:
ion Heat Losses:
t Losses:


in menu?


CRT 11


8.00
40.00
96.00
44.90
3.00
1.10
1.10
1.10
0.80
1
1.50
60.00


For The Wall



ft
ft
ft
ft
ft
BTU/hr F ft2
BTU/hr F ft2
BTU/hr F ft2
BTU/hr F ft


F



BTU/hr
BTU/hr.
BTU/hr


451454.40
69120.00
520574.40















Curved Greenhouse

Greenhouse Charac

Wall Height:
LoNer Mall Height
Upper Wall Height
House Width:
House Length:
Rafter Length:


Using Different Materials For The Upper

teristics


0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00


Gable Height:
U Factor Of Lower Wall Material:
U Factor Of Upper Wall Material:
U Factor Of Rafter Material:
U Factor Of Roof Material:
U Factor Of Perimeter:
Number Of Individual Houses:
Number Of Air Exchanges Per Hour:
Temperature Difference:


Final Results
Conduction Heat Losses:
Infiltration Heat Losses:
Total Heat Losses:


ft
ft
ft
ft
ft
ft
ft
BTU/hr F fi
BTU/hr F f
fTIll? C IL


; hiugii r
BTU/hr F
BTU/hr F


F


and Lower Wall











t2
t2


ft2
ft


0.00 BTU/hr
0.00 BTU/hr
0.00 BTU/hr


CRT 12












Curved Greent
Greenhouse CI


house Using Different Haterials For The Upp
characteristics


F


Final Results
Conduction Heat L
Infiltration Heat
Total Heat Losses
Exit edit mode?


osses:
Losses:
i:


8.00
2.00
6.00
40.00
96.00
44.90
3.00
1.10
1.10
1.10
1.10
0.80
1
1.50


er and Lower Wall


ft
BTU/hr F ft2
BTU/hr F ft2
BTU/hr F ft2
BTU/hr F ft2
BTI JL_ "f


lnu/nr


Wall Height:
Lower Wall Height:
Upper Wall Height:
House Width:
House Length:
Rafter Length:
Gable Height:
U Factor Of Lower Wall Material:
U Factor Of Upper Wall Material:
U Factor Of Rafter Material:
U Factor Of Roof Material:
U Factor Of Periseter:
Number Of Individual Houses:
Number Of Air Exchanges Per Hour:
Temperature Difference:


F

0.00 BTU/hr
0.00 BTU/hr
0.00 BTU/hr


CRT 13


I


-m


r TZ















Curved Greenhou

Greenhouse Chai

Mall Height:
Lower Wall Heig
Upper Wall Heig
House Width:
House Length:
Rafter Length:
Gable Height:
U Factor Of Low
U Factor Of Upp
U Factor Of Raf
U Factor Of Roo
U Factor Of Per
Number Of Indiv
Number Of Air E
TantrartrT Oilf


Final Results
Conduction Hea
Infiltration H
Total Heat Los
Return to main me


ise Using Different Materials For Th

racteristics


)ht:
|ht:




ier Wall Material:
er Wall Material:
'ter Material:
f Material:
imeter:
idual Houses:
changes Per Hour:
ference:


t Losses:
eat Losses:
ses:
nu?


8.00
2.00
6.00
40.00
96.00
44.90
3.00
1.10
1.10
1.10
1.10
0.80
1
1.50
60.00


451454.40
69120.00
520574.40


ft
ft
ft
ft
ft
ft
ft
BT
BT1
BT
BT1
BT


F


BTU
BT1
BTU


e Upper and Lower Wall











U/hr F ft2
U/hr F ft2
U/hr F ft2
U/hr F ft2
U/hr F ft





U/hr
U/hr
/hr


CRT 14


I


















Quonset Greenhouse


G reet


House
House
Rafte
Gable
U Fac
U Fac
U Fac
Nuebe
Tempe


house Characteristics


Width:
Length:
r Length:
* Height:
tor Of Rafter Material:
tor Of Roof Material:
tor Of Perimeter:
r Of Air Exchanges Per Hour:
rature Difference:


Final Results


Conduction Heat Losses:
Infiltration Heat Losses:
Total Heat Losses:


ft
0.00 ft
0.00 ft
0.00 ft
0.00 BTU/hr F ft2
0.00 BTU/hr F ft2
0.00 BTU/hr F ft
0.00
0.00 F



0.00 BTU/hr
0.00 BTU/hr
0.00 BTU/hr


CRT 15


















30















guonset Greenhouse


Greenhouse


House Widt
House Len
Rafter Len
Gable Hei
U Factor (
U Factor
U Factor (
Number Of
Tesperatur


e Characteristics


th:
gth:
gth:
ght:
Jf Rafter Material:
Of Roof Material:
If Perimeter:
Air Exchanges Per Hour:
e Difference:


Final Results


Conduction Heat Losses:
Infiltration, Heat Losses:
Total Heat Losses:




Exit edit mode?


CRT I V-


40.00
96.00
49.70
10.00
1.10
1.10
0.80
1.50


ft
ft
ft
ft
BTU/hr F ft2
BTU/hr F ft2
BTU/hr F ft

F


0.00 BTU/hr
0.00 BTU/hr
0.00 BTU/hr


-m-mmm.-m -















uonset Greenhouse


Greenhouse Charac


House Width:
House Length:
Rafter Length:
Sable Height:


teristics


u actor UT Rafter naterial:
U Factor Of Roof Material:
U Factor Of Perimeter:
Number Of Air Exchanges Per Hour:
Temperature Difference:


Final Results


Conduction Heat Losses:
Infiltration Heat Losses:
Total Heat Losses:


362275.20 BTU/hr
46080.00 BTU/hr
408355.20 BTU/hr


return to main menu?


40.00
96.00
49.70
10.00
1.10
1.10
0.80
1.50
60.00


ft
ft
ft
ft
BTU/hr F
BTU/hr F
BTU/hr F

F


ft2
ft2
ft


Ri


. CRT 17


. 32







































































COOPERATIVE EXTENSION SERVICE, UNIVERSITY OF FLORIDA, INSTITUTE OF FOOD AND AGRICULTURAL SCIENCES, K.R. Tefertiller,
director, in cooperation with the United States Department of Agriculture, publishes this information to further the purpose of the May 8 and
June 30, 1914 Acts of Congress; and is authorized to provide research, educational information and other services only to individuals and institu-
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editors should contact this address to determine availability.




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