### Lawrence 

## Berkeley Laboratory 1 Cyclotron Road Berkeley, California 94720

(510) 456- s F rS 451-4000 AND ENVIRONMENT DIVISION ENERGY ANALYSIS PROGRAM BUILDING 90 MAIL STOP 4000 FAX (510) 486-6996 [ITS 451-6996]

DATE: July24_1995 FAX Number: 202-566-4617 TO: 

### Michael Raymond 202-566-9511 Office or Location Phone Number FROM: 

### Gre m=ist 510-486-6651 Office or Location Phone Number ADDITIONAL INSTRUCTIONS Michael, Attached are figures showing comparisons between MODCON simulation results and manufacturer test data for 10 and 12 SEER split system air conditioners and heat pumps. In each figure there are BEFORE and AFTER comparisons. The BEFORE and AFTER labels designate the comparisons that were made before and after certain modifications were made to the MODCON simulation model. The last 2 pages of this fax describe the modifications that were made to MOOCON and the guidelines used to conduct simulation runs after the modifications were made. It is no coincidence that simulation results compare most favorably with test data submitted by Manufacturer A. Manufacturer A's data submittal was by far the most detailed and complete. It is also interesting to note that the MODCON simulation model seems to do a better job at simulating the performance of air conditioners. Please give me; a call or drop me an e-mail once you've had time to digest this material. Pages including this cover: « C DATE:


### TO: FROM: 

## Lawrence Berkeley Laboratory 1 Cyclotron Road Berkeley, California 94720 (510) 486-4000 • FrS 451-4000 

### ENERGY AND ENVIRONMENT DIVISION ENERGY ANALYSIS PROGRAM

BUILDING 90 FAX (510) 486-6996 Jyly 24. 1995
Michael Raymond Greg Ro§enguist MAIL STOP 4000 [FrS 451-6996]

FAX Number: 202-586-4617 Office or Location Office (l)r Location 202-586-9611 Phone Number 510-486-6851 Phone Number ADDITIONAL INSTRU,CTIONS Michael, Attached are figures showing comparisons between MODCON simulation results and manufacturer test data for 10 and 12 SEER split system air conditioners and heat pumps. Ih each figureithere are BEFORE and AFTER comparisons. The BEFORE and AFTER labels**de~ignate** the comparisons that were made before and after certain modifications were made to the MODCON simulation modeL The la$t 2 pages of this fax describe the modifications that were made to MODCON and the guidelines**use~** to conduct simulation runs after the modifications: were made. It is no coincidence that simulation results compare most favorably with test data submitted by Manufacturer A. Manufacturer A's data submittal was by far the most detailed and complete. It is also interesting to note that the MODCON simulation model seems to do a better job at simulating the performance of air conditioners. Please give me.a call or drop me an e-mail once you've had time to digest this material. Pages including this cover: 11

### 20.0% ----------------------------- ------------ ,------------------------------------- -----

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-------------------------------------

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-10.0% -15.0% ----------------------------------------- -20.0% -------------------- - - - - - - - - - - - - - - - - - - - - --------------------------------



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## . Ou ppig-dow ! mR ISGIAoLt 05) 06-0 slyanb3 1 0 p 's nb 

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## A41oodm [ ,7p uoijoemoC) Modifications to Simulation odel • Correction Factors applied to reduce calculated capacity .. Equals 0 .. 95 @ 95°F test condition • Equals 0 .. 95 @ 82°F test condition • Equals 0 .. 94 @ 47°F test condition • Equals 0 .. 90 @ 17°F test condition • ARI map ... fiDing correlations used to model compressor (ARB Standard .. ·S-40· ... 91l· • Option to specify unit capacity .. New Suction Une Pressure Drop calculation (AP=cm 1 .. 8 )

# Cl

Ai U° ) i JI 11 l r f n i ®._i psi
a Suction Line AP for 3-ton units 0 650 Ibm/hr = 3.5 psi -9 

## HSA Ll -) 7



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o 

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## psi 

## Heat i ng Mods determined by simulation s ® Outdoor it Refrigerant-Side = 3 ®5 Tb is Line 3-ton i /i = 4.5 psi 

# uidelines for Conducting Simulation 

# Runs

.. Air Conditioners

.. Evaporator Coil Refrigerant-Side &P 

# = 3 psi

.. Condenser Coil Two-Phase Refrigerant-Side AP 

# = 5 psi

.. Suction line AP for 3..ton units @ 

## 550 Ibm/hr 

## = 3..5 psi

1\ 

## Heat Pumps

«& 

## Indoor Coil R'eftigerant-Slde**~p** «& 

## Cooling Mode = 

## 3 psi • Heating 

## Mode 

## = determined by simulation model • OutdoorCoU Refrlgerant--Side**~p** 

# = 3 .. 5 psiII 

## Suction line AP for 3-ton units @ 

## 550 Ibm/hr :: 4..5 psi