CHAPTER 9. TRIAL STANDARD LEVELS

TABLE OF CONTENTS

**9.1 INTRODUCTION** 

**.............................................................................................................. 9­1** 

**9.2 TRIAL**  **STANDARD LEVELS** 

**.......................................................................................... 9­1** 

**9.3 ENERGY­EFFICIENCY**  **EQUATIONS............................................................................ 9­3**

**9.3.1 Energy­Efficiency**  **Equation for**  **PTACs and**  **PTHPs in**  **the Cooling**  **Mode......... 9­3** 

**9.3.2 Energy­Efficiency Equation for Heating Mode................................................... 9­9** 

LIST OF TABLES

**Table 9.2.1**  **PTACs Baseline**  **Efficiency Level**  **and TSLs...........................................................**  **9­2**

**Table 9.2.2**  **PTHPs Baseline**  **Efficiency Level**  **and TSLs** 

**........................................................... 9­2** 

**Table 9.3.1**  **Existing Federal**  **Energy Conservation**  **Standards for**  **PTACs and**  **PTHPs**

**(Cooling Mode)....................................................................................................**  **9­3**

**Table 9.3.2**  **ASHRAE/IESNA Standard**  **90.1­1999 Energy**  **Efficiency Levels**  **for PTACs** 

**and PTHPs**  **(Cooling Mode).................................................................................**  **9­4**

**Table 9.3.3**  **Energy­Efficiency Equations**  **(EER as**  **a Function**  **of Cooling**  **Capacity) by**  **TSL**

**for Standards**  **Size PTACs** 

**................................................................................... 9­5** 

**Table 9.3.4**  **Energy­Efficiency Equations**  **(EER as**  **a Function**  **of Cooling**  **Capacity) by**  **TSL**

**for Standard**  **Size PTHP....................................................................................... 9­5** 

**Table 9.3.5**  **Energy­Efficiency Equations**  **for Cooling**  **Mode (EER**  **as a**  **Function of**  **Cooling**

**Capacity) by**  **TSL for**  **Non­Standard Size**  **PTAC................................................. 9­7** 

**Table 9.3.6**  **Energy­Efficiency Equations**  **for Cooling**  **Mode (EER**  **as a**  **Function of**  **Cooling**

**Capacity) by**  **TSL for**  **Non­Standard Size**  **PTHP**

**................................................. 9­8** 

**Table 9.3.7 Existing Federal Energy Conservation Standards for PTHPs (Heating Mode)..... 9­10** 

**Table 9.3.8**  **ASHRAE/IESNA Standard**  **90.1­1999 Energy­Efficiency**  **Levels for**  **PTHPs**

**(Heating Mode).................................................................................................. 9­10** 

**Table 9.3.9**  **Energy­Efficiency Equations**  **for Heating**  **Mode (COP**  **as a**  **Function of**  **Cooling**

**Capacity) by**  **TSL for**  **Standard Size**  **PTHP**

**....................................................... 9­11** 

**Table 9.3.10**  **Energy­Efficiency Equations**  **for Heating**  **Mode (COP**  **as a**  **Function of** 

**Cooling Capacity)**  **by TSL**  **for Non­Standard**  **Size PTHP** 

**................................. 9­11** 

LIST OF FIGURES

**Figure 9.3.1**  **Energy­Efficiency Equations**  **(EER as**  **a Function**  **of Cooling**  **Capacity) by** 

**TSL for Standards**  **Size PTAC............................................................................. 9­6** 

**Figure 9.3.2**  **Energy­Efficiency Equations**  **(EER as**  **a Function**  **of Cooling**  **Capacity) by** 

**TSL for**  **Standards Size**  **PTHP**

**............................................................................. 9­6** 

**Figure 9.3.3**  **Energy­Efficiency Equations**  **for Cooling**  **Mode (EER**  **as a**  **Function of** 

**Cooling Capacity)**  **by TSL**  **for Non­Standard**  **Size PTAC...................................**  **9­8**

**Figure 9.3.4**  **Energy­Efficiency Equations**  **for Cooling**  **Mode (EER**  **as a**  **Function of** 

**Cooling Capacity)**  **by TSL**  **for Non­Standard**  **Size PTHP** 

**................................... 9­9** 

**Figure 9.3.5**  **Energy­Efficiency Equations**  **for Heating**  **Mode (COP**  **as a**  **Function of** 

**Cooling Capacity) by TSL for**  **Standards Size**  **PTHP........................................ 9­12**

**9­i Figure**  **9.3.6 Energy­Efficiency**  **Equations for**  **Heating Mode**  **(COP as**  **a Function**  **of**

**Cooling Capacity)**  **by TSL**  **for Non­Standards**  **Size PTHP................................**  **9­12**

**9­ii**CHAPTER 9. TRIAL STANDARD LEVELS

9.1 INTRODUCTION

**The current**  **Federal minimum**  **energy conservation**  **standards for**  **packaged terminal**  **air**

**conditioners (PTACs)**  **and packaged**  **terminal heat**  **pumps (PTHPs)**  **and the**  **efficiency**

**requirements specified**  **by the**  **American Society**  **of Heating,**  **Refrigerating, and**  **Air­Conditioning**

**Engineers (ASHRAE)**  **and the**  **Illuminating Engineering**  **Society of**  **North America**  **(IESNA)**

**Standard 90.1­1999,**  **“** Energy Standard for Buildings Except Low­Rise Residential Buildings,”

**(ASHRAE/IESNA Standard**  **90.1­1999) are**  **expressed in**  **terms of**  **an energy­efficiency** 

**equations. For**  **the PTAC**  **and PTHP**  **equipment classes**  **with a**  **cooling capacity**  **greater than**  **or**

**equal to**  **7,000 British**  **thermal units**  **per hour**  **(Btu/h) and**  **less than**  **or equal**  **to 15,000**  **Btu/h, the** 

**energy­efficiency equation**  **characterizes the**  **relationship between**  **the energy**  **efficiency ratio** 

**(EER) of**  **the equipment**  **and cooling**  **capacity (i.e.,**  **EER is**  **a function**  **of the**  **cooling capacity**  **of**

**the equipment).**  **Therefore, for**  **these equipment,**  **the U.S.**  **Department of**  **Energy (DOE)** 

**explicitly analyzed**  **the representative**  **cooling capacities,**  **which allows**  **DOE to**  **further**

**investigate the**  **slope of**  **the energy­efficiency**  **equation. For**  **all cooling**  **capacities less**  **than 7,000** 

**Btu/h and**  **all cooling**  **capacities greater**  **than 15,000**  **Btu/h, the**  **EER is**  **calculated by**  **substituting**

**either of**  **the two**  **capacities, 7,000**  **Btu/h or**  **15,000 Btu/h,**  **in the**  **energy­efficiency equation.**  **This**

**chapter describes**  **the methodology**  **used by**  **DOE to**  **derive the**  **energy­efficiency equations**  **for**

**PTAC and**  **PTHP equipment.** 

9.2 TRIAL STANDARD LEVELS

**For the**  **subsequent analyses,**  **DOE refers**  **to the**  **grouping of**  **efficiency levels**  **for each** 

**equipment class**  **as trial**  **standard levels**  **(TSLs). The**  **TSLs are**  **identical to**  **the efficiency**  **levels**

**examined in**  **the energy**  **use characterization**  **analysis and**  **the life­cycle**  **cost (LCC)**  **and payback** 

**period analyses.**  **Table 9.2.1**  **and Table**  **9.2.2 present**  **the analyzed**  **efficiency levels**  **as TSLs**  **for**

**standard size**  **and non­standard**  **size PTACs**  **and PTHPs**  **for the**  **notice of**  **proposed notice** 

**(NOPR).**

**9­1**Table 9.2.1 PTACs Baseline Efficiency Level and TSLs

Equipment

Class

(Cooling

Capacity a ) Efficiency

Metric b Baseline

(ASHRAE/IESNA

Standard 90.1­1999) TSL

1 TSL

2 TSL

3 TSL

4 TSL

5 TSL

6 TSL 7

(MaxTech)

**Standard Size** 

**PTAC**

**(9,000 Btu/h)**  **EER 10.6**  **10.9 10.9**  **11.1 10.9**  **11.3 11.5**  **12.0**

**Standard Size** 

**PTAC**

**(12,000 Btu/h)**  **EER 9.9**  **10.2 10.2**  **10.4 10.2**  **10.6 10.8**  **11.5**

**Non­Standard**

**Size PTAC** 

**(11,000 Btu/h)**  **EER 8.6**  **9.4 9.4**  **9.7 9.4**  **10.0 10.7**  **11.2**

Table 9.2.2 PTHPs Baseline Efficiency Level and TSLs

Equipment

Class

(Cooling

Capacity) Efficiency

Metric c Baseline

(ASHRAE/IESNA

Standard 90.1­1999) TSL

1 TSL

2 TSL

3 TSL

4 TSL

5 TSL

6 TSL 7

MaxTech

**Standard Size** 

**PTHP**

**(9,000 Btu/h)**  **EER**

**COP 10.4** 

**3.0 10.9** 

**3.1 11.1** 

**3.2 11.1** 

**3.2 11.3** 

**3.3 11.3** 

**3.3 11.5** 

**3.3 12.0** 

**3.5**

**Standard Size** 

**PTHP EER**  **9.7 10.2**  **10.4 10.4**  **10.6 10.6**  **10.8 11.7** 

**(12,000 COP**  **2.9 3.0**  **3.1 3.1**  **3.1 3.1**  **3.1 3.3** 

**Btu/h)**

**Non­Standard**

**PTHP EER**  **8.5 9.4**  **9.7 9.7**  **10.0 10.0**  **10.7 11.4** 

**(11,000 COP**  **2.6 2.8**  **2.8 2.8**  **2.9 2.9**  **2.9 2.9** 

**Btu/h)**

**The reference**  **case or**  **baseline is**  **the efficiency**  **levels specified**  **by ASHRAE/IESNA** 

**Standard 90.1­1999.**  **TSLs 1,**  **3, 5,**  **and 6**  **represent matched**  **pairs of**  **efficiency levels**  **for the** 

**three representative**  **cooling capacities**  **of PTACs**  **and PTHPs.**  **In other**  **words, the**  **efficiency**

**levels for**  **PTACs and**  **PTHPs with**  **the same**  **cooling capacity**  **and wall**  **sleeve dimensions**  **are**

**equivalent for**  **these four**  **TSLs. DOE**  **maintained the**  **0.7 EER**  **decrement established**  **by**

**ASHRAE/IESNA Standard**  **90.1­1999 between**  **the standard**  **size equipment**  **with cooling** 

**capacities of**  **9,000 Btu/h**  **and 12,000**  **Btu/h. In**  **addition, TSL**  **7 is**  **the maximum**  **technologically**

**feasible (“max**  **tech”) level**  **for each**  **equipment class**  **identified in**  **Chapter 5**  **of the**  **TSD.**

**a Cooling**  **capacities are**  **expressed in**  **British thermal**  **unit per**  **hour (Btu/h).** 

**b According**  **to the**  **Air­Conditioning and**  **Refrigeration Institute**  **(ARI) 310/380­2004**  Standard for Packaged

Terminal Air­Conditioners and Heat Pumps **(ARI 310/380­2004)**  **test procedure,**  **energy­efficiency ratio**  **(EER) is** 

**defined as**  **“the ratio**  **of the**  **produced cooling**  **effect of**  **an air**  **conditioner or**  **heat pump**  **to its**  **net work**  **input,**

**expressed in**  **Btu/watt­hour.”**

**Coefficient of**  **performance (COP)**  **is defined**  **by ARI**  **310/380­2004 as**  **“the ratio**  **of the**  **produced cooling**  **effect of** 

**an air**  **conditioner or**  **heat pump**  **(or its**  **produced heating**  **effect, depending**  **on the**  **mode of**  **operation) to**  **its net**  **work**

**input, when**  **both the**  **cooling (or**  **heating) effect**  **and the**  **net work**  **input are**  **expressed in**  **identical units**  **of**

**measurement.”**

**9­2 c** **After examining**  **preliminary results**  **of the**  **LCC analysis**  **(see Chapter**  **8 of**  **the TSD),** 

**DOE developed**  **two additional**  **TSLs, TSL**  **2 and**  **TSL 4,**  **based on**  **the large**  **differences in**  **LCC**

**savings results**  **between PTACs**  **and PTHPs.**  **TSL 2**  **and TSL**  **4 combine**  **different efficiency** 

**pairings between**  **PTACs and**  **PTHPs. In**  **other words,**  **DOE examined**  **the impacts**  **of amended** 

**energy conservation**  **standards when**  **PTACs and**  **PTHPs are**  **required to**  **meet different**  **efficiency**

**levels. For**  **TSL 2,**  **DOE combined**  **TSL 1**  **for PTACs**  **and TSL**  **3 for**  **PTHPs. For**  **TSL 4,**  **DOE**

**combined TSL**  **1 for**  **PTACs and**  **TSL 5**  **for PTHPs.**  **These two**  **combination levels**  **serve to** 

**maximize LCC**  **savings, while**  **recognizing the**  **differences in**  **LCC results**  **for PTACs**  **and PTHPs.** 

9.3 ENERGY­EFFICIENCY EQUATIONS

**The following**  **sections describe**  **the methodology**  **DOE used**  **to develop**  **the energy** 

**efficiency equations**  **for each**  **TSL. To**  **develop the**  **energy­efficiency equation**  **in terms**  **of EER** 

**and cooling**  **capacity for**  **each TSL,**  **DOE used**  **a linear**  **regression and**  **the existing** 

**ASHRAE/IESNA Standard**  **90.1­1999 energy­efficiency**  **equations.**

9.3.1 Energy­Efficiency Equation for PTACs and PTHPs in the Cooling Mode

**As stated**  **in the**  **engineering analysis**  **(see Chapter**  **5 of**  **this TSD),**  **current Federal**  **energy**

**conservation standards**  **and the**  **efficiency levels**  **specified by**  **ASHRAE/IESNA Standard**  **90.1­**

**1999 for**  **PTACs and**  **PTHPs in**  **the cooling**  **mode are**  **a function**  **of the**  **equipment’s cooling** 

**capacity. Both**  **standards specify**  **requirements in**  **the form**  **of energy­efficiency**  **equations to** 

**calculate the**  **EER based**  **on the**  **equipment’s cooling**  **capacity for**  **PTACs and**  **PTHPs with**  **a**

**cooling capacity**  **greater than**  **or equal**  **to 7,000**  **Btu/h and**  **less than**  **or equal**  **to 15,000**  **Btu/h for** 

**each equipment**  **class. Table**  **9.3.1 and**  **Table 9.3.2**  **show the**  **current Federal**  **energy conservation** 

**standards and**  **efficiency levels**  **specified by**  **ASHRAE/IESNA Standard**  **90.1­1999 for**  **PTACs**

**and PTHPs**  **in the**  **cooling mode,**  **respectively.**

Table 9.3.1 Existing Federal Energy Conservation Standards for PTACs and PTHPs

(Cooling Mode)

Equipment Class Existing Federal

Energy Conservation Standards* Equipment Cooling Capacity

**PTAC <7,000**  **Btu/h EER** 

**= 8.88** 

**>7,000 Btu/h**  **and**

**<15,000 Btu/h**  **EER**

**= 10.0** 

**– (0.16**  **x Cap** )**

**>15,000 Btu/h**  **EER**

**= 7.6** 

**PTHP <7,000**  **Btu/h EER** 

**= 8.88** 

**>7,000 Btu/h**  **and**

**<15,000 Btu/h**  **EER**

**= 10.0** 

**– (0.16**  **x Cap** )**

**>15,000 Btu/h**  **EER**

**= 7.6** 

***** **For equipment**  **rated according**  **to the**  **Air­Conditioning and**  **Refrigeration Institute**  **(ARI) standards,**  **all EER**  **values**

**must be**  **rated at**  **95oF outdoor**  **dry­bulb temperature**  **for air­cooled**  **products and**  **evaporatively­cooled products**  **and at** 

**85oF entering**  **water temperature**  **for water**  **cooled products.** 

****** **Cap means**  **cooling capacity**  **in kBtu/h**  **at 95oF**  **outdoor dry­bulb**  **temperature.**

**9­3**Table 9.3.2 ASHRAE/IESNA Standard 90.1­1999 Energy Efficiency Levels for PTACs and

PTHPs (Cooling Mode)

Equipment Class Proposed Energy

Conservation Standards * Equipment Category Cooling

Capacity

**PTAC Standard**  **Size** ****** **<7,000 Btu/h**  **EER**

**= 11.0** 

**≥7,000 Btu/h**  **and**

**≤15,000 Btu/h**  **EER**

**= 12.5** 

**– (0.213**  **x Cap**  **†† )** 

**>15,000 Btu/h**  **EER**

**= 9.3** 

**Non­Standard Size**  † **<7,000 Btu/h**  **EER**

**= 9.4** 

**≥7,000 Btu/h**  **and**

**≤15,000 Btu/h**  **EER**

**= 10.9** 

**– (0.213**  **x Cap**  **†† )** 

**>15,000 Btu/h**  **EER**

**= 7.7** 

**PTHP Standard**  **Size** ****** **<7,000 Btu/h**  **EER**

**= 10.8** 

**≥7,000 Btu/h**  **and**

**≤15,000 Btu/h**  **EER**

**= 12.3** 

**– (0.213**  **x Cap**  **†† )** 

**>15,000 Btu/h**  **EER**

**= 9.1** 

**Non­Standard Size**  † **<7,000 Btu/h**  **EER**

**= 9.3** 

**≥7,000 Btu/h**  **and**

**≤15,000 Btu/h**  **EER**

**= 10.8** 

**– (0.213**  **x Cap**  **†† )** 

**>15,000 Btu/h**  **EER**

**= 7.6** 

***** **For equipment**  **rated according**  **to ARI**  **standards, all**  **EER values**  **must be**  **rated at**  **95oF outdoor**  **dry­bulb**

**temperature for**  **air­cooled products**  **and evaporatively­cooled**  **products and**  **at 85oF**  **entering water**  **temperature for** 

**water cooled**  **products.**

****** **Standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **greater than**  **or equal**  **to 16**  **inches**

**high, or**  **greater than**  **or equal**  **to 42**  **inches wide.** 

**† Non­standard**  **size refers**  **to PTAC**  **or PTHP**  **equipment with**  **wall sleeve**  **dimensions less**  **than 16**  **inches high**  **and**

**less than**  **42 inches**  **wide. ASHRAE/IESNA**  **Standard 90.1­1999**  **also includes**  **a factory**  **labeling requirement**  **for**

**non­standard size**  **PTAC and**  **PTHP equipment**  **as follows:**  **“MANUFACTURED FOR**  **REPLACEMENT**

**APPLICATIONS ONLY;**  **NOT TO**  **BE INSTALLED**  **IN NEW**  **CONSTRUCTION PROJECTS.”** 

**†† Cap**  **means cooling**  **capacity in**  **kBtu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

**To derive**  **the standards**  **(i.e., efficiency**  **level as**  **a function**  **of cooling**  **capacity), DOE** 

**plotted the**  **representative cooling**  **capacities and**  **the corresponding**  **efficiency levels**  **for each** 

**TSL. DOE**  **then calculated**  **the equation**  **of the**  **line pass**  **through the**  **EER values**  **for 9,000**  **Btu/h**

**and 12,000**  **Btu/h for**  **standard size**  **PTACs and**  **PTHPs.**

**For PTACs**  **and PTHPs**  **with cooling**  **capacity less**  **than 7,000**  **Btu/h, DOE**  **determined the** 

**corresponding EER**  **value using**  **a cooling**  **capacity of**  **7,000 Btu/h**  **in the**  **energy­efficiency**

**equation. For**  **PTACs and**  **PTHPs with**  **a cooling**  **capacity greater**  **than 15,000**  **Btu/h cooling** 

**capacity, DOE**  **determined the**  **EER value**  **using a**  **cooling capacity**  **of 15,000**  **Btu/h in**  **the energy** 

**efficiency equation.**  **This is**  **the same**  **method established**  **in the**  **Energy Policy**  **Act of**  **1992 and** 

**provided in**  **ASHRAE/IESNA 90.1­1999**  **for calculating**  **the EER**  **and COP**  **of equipment**  **with**

**cooling capacities**  **smaller than**  **7,000 Btu/h**  **and larger**  **than 15,000**  **Btu/h.**

**Table 9.3.3**  **and Table**  **9.3.4 list**  **the equations**  **for the**  **corresponding TSL**  **for standard**  **size**

**PTAC and**  **PTHP.**

**9­4**Table 9.3.3 Energy­Efficiency Equations (EER as a Function of Cooling Capacity) by TSL

for Standards Size PTACs

Standard Size** PTACs Energy­Efficiency Equation*

**Baseline ASHRAE/IESNA**  **Standard 90.1­1999**  **EER**

**= 12.5**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 1**  **EER**

**= 13.0**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 2**  **EER**

**= 13.0**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 3**  **EER**

**= 13.2**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 4**  **EER**

**= 13.0**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 5**  **EER**

**= 13.4**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 6**  **EER**

**= 13.6**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 7**  **EER**

**= 13.5**  **­ (0.167 x**  **Cap †**  **/1000)**

***** **For equipment**  **rated according**  **to the**  **DOE test**  **procedure, all**  **EER values**  **must be**  **rated at**  **95oF outdoor**  **dry­bulb**

**temperature for**  **air­cooled products**  **and evaporatively­cooled**  **products and**  **at 85oF**  **entering water**  **temperature for** 

**water cooled**  **products.**

****** **Standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **greater than**  **or equal**  **to 16**  **inches**

**high, or**  **greater than**  **or equal**  **to 42**  **inches wide.** 

**† Cap**  **means cooling**  **capacity in**  **Btu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

Table 9.3.4 Energy­Efficiency Equations (EER as a Function of Cooling Capacity) by TSL

for Standard Size PTHP

Standard Size** PTHPs Energy­Efficiency Equation*

**Baseline ASHRAE/IESNA**  **Standard 90.1­1999**  **EER**

**= 12.3**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 1**  **EER**

**= 13.0**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 2**  **EER**

**= 13.2**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 3**  **EER**

**= 13.2**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 4**  **EER**

**= 13.4**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 5**  **EER**

**= 13.4**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 6**  **EER**

**= 13.6**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 7**  **EER**

**= 12.9**  **­ (0.100 x**  **Cap †**  **/1000)**

***** **For equipment**  **rated according**  **to the**  **DOE test**  **procedure, all**  **EER values**  **must be**  **rated at**  **95oF outdoor**  **dry­bulb**

**temperature for**  **air­cooled products**  **and evaporatively­cooled**  **products and**  **at 85oF**  **entering water**  **temperature for** 

**water cooled**  **products.**

****** **Standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **greater than**  **or equal**  **to 16**  **inches**

**high, or**  **greater than**  **or equal**  **to 42**  **inches wide.** 

**† Cap**  **means cooling**  **capacity in**  **Btu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

**Figure 9.3.1**  **and Figure**  **9.3.2 show**  **each energy­efficiency**  **equation plotted**  **for the** 

**various TSLs**  **for standard**  **size PTACs**  **and PTHPs.** 

**9­5**8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0EER Baseline

TSL 1, TSL 2, TSL 4

TSL 3

TSL 5

TSL 6

TSL 7 (Max Tech)

5,000 7,000 9,000 11,000 13,000 15,000 17,000 19,000

Cooling Capacity, Btu/h

Figure 9.3.1 Energy­Efficiency Equations (EER as a Function of Cooling Capacity) by

TSL for Standards Size PTAC

8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0EER Baseline

TSL 1

TSL 2, TSL 3

TSL 4, TSL 5

TSL 6

TSL 7 (Max Tech)

5,000 7,000 9,000 11,000 13,000 15,000 17,000 19,000

Cooling Capacity, Btu/h

Figure 9.3.2 Energy­Efficiency Equations (EER as a Function of Cooling Capacity) by

TSL for Standards Size PTHP

**9­6 The**  **above plots**  **show the**  **decreasing trend**  **observed in**  **the engineering**  **analysis (i.e.,** 

**efficiency decreases**  **with increase**  **in cooling**  **capacity). Energy­efficiency**  **equations for**  **the**

**TSLs above**  **the baseline**  **for standard**  **size PTAC**  **and PTHP**  **equipment, not**  **including TSL**  **7,**

**have a**  **slightly steeper**  **slope than**  **the slope**  **for the**  **energy­efficiency equations**  **in**

**ASHRAE/IESNA Standard**  **90.1­1999 (shown**  **as baseline).**  **Excluding the**  **baseline energy** 

**efficiency equation**  **and the**  **energy­efficiency equation**  **corresponding to**  **TSL 7,**  **the slopes**  **of the** 

**energy­efficiency equations**  **for TSL**  **1 through**  **6 are**  **the same**  **for standard**  **size PTAC**  **and PTHP** 

**equipment due**  **to the**  **efficiency pairings.** 

**For non­standard**  **size PTAC**  **and PTHP**  **equipment, DOE**  **used the**  **ASHRAE/IESNA**

**Standard 90.1­1999**  **energy­efficiency equation**  **slope and**  **the representative**  **cooling capacity** 

**(i.e., 11,000**  **Btu/h cooling**  **capacity) to**  **develop the**  **energy­efficiency equations**  **representing the** 

**entire cooling**  **capacity range**  **at each**  **TSL. For**  **PTACs and**  **PTHPs with**  **cooling capacity**  **less**

**than 7,000**  **Btu/h, DOE**  **determined the**  **corresponding EER**  **value by**  **substituting the**  **cooling**

**capacity of**  **7,000 Btu/h**  **in the**  **energy­efficiency equation.**  **For PTACs**  **and PTHPs**  **with a**  **cooling**

**capacity greater**  **than 15,000**  **Btu/h cooling**  **capacity, DOE**  **determined the**  **EER value**  **by**

**substituting the**  **cooling capacity**  **of 15,000**  **Btu/h in**  **the energy­efficiency**  **equation. This**  **is the** 

**same method**  **established in**  **the Energy**  **Policy Act**  **of 1992**  **and provided**  **in ASHRAE/IESNA** 

**Standard 90.1­1999**  **for calculating**  **the EER**  **and COP**  **of equipment**  **with cooling**  **capacities less** 

**than 7,000**  **Btu/h and**  **greater than**  **15,000 Btu/h.** 

**Table 9.3.5**  **and Table**  **9.3.6 list**  **the equations**  **for the**  **corresponding TSL**  **for non­standard** 

**size PTAC**  **and PTHP.** 

Table 9.3.5 Energy­Efficiency Equations for Cooling Mode (EER as a Function of Cooling

Capacity) by TSL for Non­Standard Size PTAC

Non­Standard Size** PTACs Energy­Efficiency Equation*

**Baseline ASHRAE/IESNA**  **Standard 90.1­1999**  **EER**

**= 10.9**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 1**  **EER**

**= 11.7**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 2**  **EER**

**= 11.7**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 3**  **EER**

**= 12.0**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 4**  **EER**

**= 11.7**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 5**  **EER**

**= 12.3**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 6**  **EER**

**= 13.0**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 7**  **EER**

**= 13.5**  **­ (0.213 x**  **Cap †**  **/1000)**

***** **For equipment**  **rated according**  **to the**  **DOE test**  **procedure, all**  **EER values**  **must be**  **rated at**  **95oF outdoor**  **dry­bulb**

**temperature for**  **air­cooled products**  **and evaporatively­cooled**  **products and**  **at 85oF**  **entering water**  **temperature for** 

**water cooled**  **products.**

****** **Non­standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **less than**  **16 inches**  **high and** 

**less than**  **42 inches**  **wide.**

**† Cap**  **means cooling**  **capacity in**  **Btu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

**9­7**Table 9.3.6 Energy­Efficiency Equations for Cooling Mode (EER as a Function of Cooling

Capacity) by TSL for Non­Standard Size PTHP

Non­Standard Size** PTHPs Energy­Efficiency Equation*

**Baseline ASHRAE/IESNA**  **Standard 90.1­1999**  **EER**

**= 10.8**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 1**  **EER**

**= 11.7**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 2**  **EER**

**= 12.0**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 3**  **EER**

**= 12.0**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 4**  **EER**

**= 12.3**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 5**  **EER**

**= 12.3**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 6**  **EER**

**= 13.0**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 7**  **EER**

**= 13.7**  **­ (0.213 x**  **Cap †**  **/1000)**

***** **For equipment**  **rated according**  **to the**  **DOE test**  **procedure, all**  **EER values**  **must be**  **rated at**  **95oF outdoor**  **dry­bulb**

**temperature for**  **air­cooled products**  **and evaporatively­cooled**  **products and**  **at 85oF**  **entering water**  **temperature for** 

**water cooled**  **products.**

****** **Non­standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **less than**  **16 inches**  **high and** 

**less than**  **42 inches**  **wide.**

**† Cap**  **means cooling**  **capacity in**  **Btu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

**Figure 9.3.3**  **and Figure**  **9.3.4 show**  **each equation**  **plotted for**  **the various**  **TSLs for**  **non**

**standard size**  **PTACs and**  **PTHPs.**

7.0 8.0 9.0 10.0 11.0 12.0 13.0EER Baseline

TSL 1, TSL 2, TSL 4

TSL 3

TSL 5

TSL 6

TSL 7 (Max Tech)

5,000 7,000 9,000 11,000 13,000 15,000 17,000 19,000

Cooling Capacity, Btu/h

Figure 9.3.3 Energy­Efficiency Equations for Cooling Mode (EER as a Function of Cooling

Capacity) by TSL for Non­Standard Size PTAC

**9­8**7.0 8.0 9.0 10.0 11.0 12.0 13.0EER Baseline

TSL 1

TSL 2, TSL 3

TSL 4, TSL 5

TSL 6

TSL 7 (Max Tech)

5,000 7,000 9,000 11,000 13,000 15,000 17,000 19,000

Cooling Capacity, Btu/h

Figure 9.3.4 Energy­Efficiency Equations for Cooling Mode (EER as a Function of Cooling

Capacity) by TSL for Non­Standard Size PTHP

**The above**  **plots show**  **the decreasing**  **trend observed**  **in the**  **engineering analysis**  **(i.e.,**

**efficiency decreases**  **with increase**  **in cooling**  **capacity). All**  **energy­efficiency equations**  **for the** 

**TSLs above**  **the baseline**  **for non­standard**  **size PTAC**  **and PTHP**  **equipment have**  **the same**  **slope**

**as the**  **energy­efficiency equations**  **in ASHRAE/IESNA**  **Standard 90.1­1999.**  **TSLs that**  **have the** 

**same efficiency**  **pairing between**  **PTACs and**  **PTHPs have**  **identical energy­efficiency**  **equations**

**(e.g., TSL1,**  **3, 5,**  **and 6).** 

9.3.2 Energy­Efficiency Equation for Heating Mode

**The current**  **Federal energy**  **conservation standards**  **for PTHPs**  **in the**  **heating mode**  **is**

**expressed as**  **heating coefficient**  **of performance**  **(COP) as**  **a function**  **of the**  **PTHP’s cooling**  **EER.**

**Similar to**  **the energy­efficiency**  **equations for**  **PTHPs in**  **the cooling**  **mode, the**  **standards specify** 

**COP in**  **the form**  **of an**  **energy­efficiency equation**  **as a**  **function of**  **EER for**  **PTHPs with**  **a cooling** 

**capacity greater**  **than or**  **equal to**  **7,000 Btu/h**  **and less**  **than or**  **equal to**  **15,000 Btu/h.**  **For PTHPs** 

**with cooling**  **capacity less**  **than 7,000**  **Btu/h, the**  **standard is**  **specified by**  **the COP**  **value**

**corresponding to**  **the EER**  **value for**  **equipment with**  **cooling capacity**  **of 7,000**  **Btu/h in**  **the**

**energy­efficiency equation.**  **For PTHPs**  **with a**  **cooling capacity**  **greater than**  **15,000 Btu/h,**  **the**

**standard is**  **specified by**  **the COP**  **value corresponding**  **to the**  **EER value**  **for equipment**  **with**

**cooling capacity**  **of 15,000**  **Btu/h in**  **the energy­efficiency**  **equation.**

**The current**  **Federal minimum**  **energy conservation**  **standards for**  **PTHPs in**  **the heating** 

**mode in**  **terms of**  **the COP**  **are presented**  **in Table**  **9.3.7.**

**9­9**Table 9.3.7 Existing Federal Energy Conservation Standards for PTHPs (Heating Mode)

Equipment Class Existing Federal

Energy Conservation Standards Equipment Cooling Capacity

**PTHP <7,000**  **Btu/h COP** 

**= 2.7** 

**>7,000 Btu/h**  **and**

**<15,000 Btu/h**  **COP**

**= 1.3**  **+ (0.16**  **x EER)** 

**>15,000 Btu/h**  **COP**

**= 2.5** 

**The efficiency**  **requirements in**  **ASHRAE/IESNA Standard**  **90.1­1999 are**  **specified by** 

**energy­efficiency equations**  **as a**  **function of**  **the equipment’s**  **cooling capacity**  **for PTHPs**  **with a** 

**cooling capacity**  **greater than**  **or equal**  **to 7,000**  **Btu/h and**  **less than**  **or equal**  **to 15,000**  **Btu/h for** 

**each equipment**  **class (i.e.,**  **COP is**  **a function**  **of the**  **equipment’s cooling**  **capacity). For**  **PTHPs**

**with cooling**  **capacity less**  **than 7,000**  **Btu/h, the**  **standard is**  **determined by**  **the corresponding** 

**COP value**  **by substituting**  **the cooling**  **capacity of**  **7,000 Btu/h**  **in the**  **energy­efficiency equation.** 

**For PTHPs**  **with a**  **cooling capacity**  **greater than**  **15,000 Btu/h,**  **the standard**  **is determined**  **by the** 

**COP value**  **by substituting**  **the cooling**  **capacity of**  **15,000 Btu/h**  **in the**  **energy­efficiency**

**equation.**

**Table 9.3.8**  **shows the**  **ASHRAE/IESNA Standard**  **90.1­1999 energy­efficiency**  **equations**

**for the**  **COP of**  **PTHPs.**

Table 9.3.8 ASHRAE/IESNA Standard 90.1­1999 Energy­Efficiency Levels for PTHPs

(Heating Mode)

Equipment Class Proposed Energy

Conservation Standards Equipment Category Cooling

Capacity

**PTHP Standard**  **Size** ***** **<7,000 Btu/h**  **COP**

**= 3.0** 

**≥7,000 Btu/h**  **and**

**≤15,000 Btu/h**  **COP**

**= 3.2** 

**– (0.026**  **x Cap**  **† )** 

**>15,000 Btu/h**  **COP**

**= 2.8** 

**Non­Standard Size** ** **<7,000 Btu/h**  **COP**

**= 2.7** 

**≥7,000 Btu/h**  **and**

**≤15,000 Btu/h**  **COP**

**= 2.9** 

**– (0.026**  **x Cap**  **† )** 

**>15,000 Btu/h**  **COP**

**= 2.5** 

***** **Standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **greater than**  **or equal**  **to 16**  **inches**

**high, or**  **greater than**  **or equal**  **to 42**  **inches wide.** 

****** **Non­standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **less than**  **16 inches**  **high and** 

**less than**  **42 inches**  **wide. ASHRAE/IESNA**  **Standard 90.1­1999**  **also includes**  **a factory**  **labeling requirement**  **for**

**non­standard size**  **PTAC and**  **PTHP equipment**  **as follows:**  **“MANUFACTURED FOR**  **REPLACEMENT**

**APPLICATIONS ONLY;**  **NOT TO**  **BE INSTALLED**  **IN NEW**  **CONSTRUCTION PROJECTS.”** 

**† Cap**  **means cooling**  **capacity in**  **kBtu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

**To maintain**  **consistency with**  **ASHRAE/IESNA Standard**  **90.1­1999 and**  **to develop**  **the**

**energy­efficiency equations**  **for heating**  **COP, DOE**  **evaluated the**  **COP as**  **a function**  **of cooling** 

**capacity. DOE**  **applied the**  **same methodology**  **for deriving**  **the energy­efficiency**  **equations as** 

**that for**  **the cooling**  **mode. To**  **derive the**  **standard size**  **PTHP energy­efficiency**  **equations (i.e.,** 

**COP as**  **a function**  **of cooling**  **capacity), DOE**  **plotted the**  **representative cooling**  **capacities and** 

**9­10 corresponding**  **COP levels**  **for each**  **TSL. For**  **non­standard size**  **PTHPs, DOE**  **used the** 

**ASHRAE/IESNA Standard**  **90.1­1999 equation**  **slope and**  **the representative**  **cooling capacity** 

**(i.e., 11,000**  **Btu/h) to**  **develop the**  **energy­efficiency equations**  **for heating**  **COP that**  **correspond**

**to the**  **entire cooling**  **capacity range**  **at each**  **TSL.**

**Table 9.3.9**  **and Table**  **9.3.10 list**  **the energy­efficiency**  **equations for**  **COP and**  **the**

**corresponding TSL**  **for standard**  **and non­standard**  **size PTHP,**  **respectively.**

Table 9.3.9 Energy­Efficiency Equations for Heating Mode (COP as a Function of Cooling

Capacity) by TSL for Standard Size PTHP

Standard Size** PTHPs Energy­Efficiency Equation*

**Baseline ASHRAE/IESNA**  **Standard 90.1­1999**  **COP**

**= 3.2**  **­ (0.026 x**  **Cap †**  **/1000)**

**TSL 1**  **COP**

**= 3.6**  **­ (0.046 x**  **Cap †**  **/1000)**

**TSL 2**  **COP**

**= 3.6**  **­ (0.044 x**  **Cap †**  **/1000)**

**TSL 3**  **COP**

**= 3.6**  **­ (0.044 x**  **Cap †**  **/1000)**

**TSL 4**  **COP**

**= 3.7**  **­ (0.053 x**  **Cap †**  **/1000)**

**TSL 5**  **COP**

**= 3.7**  **­ (0.053 x**  **Cap †**  **/1000)**

**TSL 6**  **COP**

**= 3.8**  **­ (0.053 x**  **Cap †**  **/1000)**

**TSL 7**  **COP**

**= 4.1**  **­ (0.074 x**  **Cap †**  **/1000)**

***** **For equipment**  **rated according**  **to the**  **DOE test**  **procedure, all**  **COP values**  **must be**  **rated at**  **47oF outdoor**  **dry­bulb**

**temperature for**  **air­cooled products,**  **and at**  **70oF entering**  **water temperature**  **for water­source**  **heat pumps.** 

****** **Standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **greater than**  **or equal**  **to 16**  **inches**

**high, or**  **greater than**  **or equal**  **to 42**  **inches wide.** 

**† Cap**  **means cooling**  **capacity in**  **Btu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

Table 9.3.10 Energy­Efficiency Equations for Heating Mode (COP as a Function of

Cooling Capacity) by TSL for Non­Standard Size PTHP

Non­Standard Size** PTHPs Energy­Efficiency Equation*

**Baseline ASHRAE/IESNA**  **Standard 90.1­1999**  **COP**

**= 2.9**  **­ (0.026 x**  **Cap †**  **/1000)**

**TSL 1**  **COP**

**= 3.1**  **­ (0.026 x**  **Cap †**  **/1000)**

**TSL 2**  **COP**

**= 3.1**  **­ (0.026 x**  **Cap †**  **/1000)**

**TSL 3**  **COP**

**= 3.1**  **­ (0.026 x**  **Cap †**  **/1000)**

**TSL 4**  **COP**

**= 3.1**  **­ (0.026 x**  **Cap †**  **/1000)**

**TSL 5**  **COP**

**= 3.1**  **­ (0.026 x**  **Cap †**  **/1000)**

**TSL 6**  **COP**

**= 3.2**  **­ (0.026 x**  **Cap †**  **/1000)**

**TSL 7**  **COP**

**= 3.2**  **­ (0.026 x**  **Cap †**  **/1000)**

***** **For equipment**  **rated according**  **to the**  **DOE test**  **procedure, all**  **EER values**  **must be**  **rated at**  **95oF outdoor**  **dry­bulb**

**temperature for**  **air­cooled products**  **and evaporatively­cooled**  **products and**  **at 85oF**  **entering water**  **temperature for** 

**water cooled**  **products. All**  **COP values**  **must be**  **rated at**  **47oF outdoor**  **dry­bulb temperature**  **for air­cooled**  **products,**

**and at**  **70oF entering**  **water temperature**  **for water­source**  **heat pumps.** 

****** **Non­standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **less than**  **16 inches**  **high and** 

**less than**  **42 inches**  **wide.**

**† Cap**  **means cooling**  **capacity in**  **Btu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

**Figure 9.3.5**  **and Figure**  **9.3.6 show**  **each energy­efficiency**  **equation for**  **PTHPs in**  **the**

**heating mode**  **(i.e., COP**  **as a**  **function of**  **cooling capacity)**  **plotted for**  **the baseline**  **efficiency**

**level and**  **each TSL**  **for standard**  **and non­standard**  **size PTHPs,**  **respectively.**

**9­11**2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8COP Baseline

TSL1

TSL 2, TSL 3

TSL 4, TSL 5

TSL 6

TSL 7 (Max Tech)

5,000 7,000 9,000 11,000 13,000 15,000 17,000 19,000

Cooling Capacity, Btu/h

Figure 9.3.5 Energy­Efficiency Equations for Heating Mode (COP as a Function of

Cooling Capacity) by TSL for Standards Size PTHP

2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8COP Baseline

TSL1

TSL 2, TSL 3

TSL 4, TSL 5

TSL 6

TSL 7 (Max Tech)

5,000 7,000 9,000 11,000 13,000 15,000 17,000 19,000

Cooling Capacity, Btu/h

Figure 9.3.6 Energy­Efficiency Equations for Heating Mode (COP as a Function of

Cooling Capacity) by TSL for Non­Standards Size PTHP

**9­12 The**  **above plots**  **show the**  **decreasing trend**  **observed in**  **the engineering**  **analysis (i.e.,** 

**efficiency decreases**  **with increase**  **in cooling**  **capacity). All**  **energy­efficiency equations**  **for the** 

**TSLs above**  **the baseline**  **for the**  **non­standard size**  **PTHP equipment**  **have the**  **same slope**  **as the** 

**energy­efficiency equations**  **in ASHRAE/IESNA**  **Standard 90.1­1999.** 

**9­13**