Introduction

• Advanced energy recovery heat pump for the Engineering Science and Research Building (ESRB).

• ESRB uses 54,000 CFM of 100% make-up air 24 hours a day 7 days a week.

• This amount of ventilation air is required by OSHA.

• No energy recovery system is presently installed.

What is a Heat Pump and How Does it Work?

• A basic heat pump consists of 4 components.

– Compressor– Condenser Coil– Evaporator Coil– Expansion Valve

• Used to transfer energy from the exhaust air to the make-up air.

• Our system will use a DX heat pump system.

What Makes This System Advanced?

• The compressor in this system will be a Turbocor TT400.

• The TT400 is a centrifugal compressor capable of 160 tons of cooling.

• Utilizes magnetic bearings which eliminates the need for oil.

• Capable of high COP’s which leads to higher efficiency and cheap operation.

• Maintains high efficiency even at low loads.

Water-Glycol Heat Recovery System

• Plans for a water-glycol heat recovery system were made but the system was never installed.

• Exhaust ducts were designed to accept heat recovery coils.

Exhaust Air Duct

Why a DX System?

• Latent heat of vaporization

Performance Comparison of Heat Recovery Systems

0.00

50.00

100.00

150.00

200.00

250.00

-10 0 10 20 30 40 50 60

Outdoor Air Temperature (F)

Lo

ad (

To

ns)

Required load

W-G system

D-X system

Economic Comparison of Heat Recovery Systems

$0.00

$1.00

$2.00

$3.00

$4.00

$5.00

$6.00

-10 -5 0 5 10 15 20 25 30 35 40 45

Outside Air Temperature (F)

Sav

ing

s (

do

llars

/hr)

D-X system

W-G system

24,000 dollars/year

Environmental Comparison of Heat Recovery Systems

0.00

2.00

4.00

6.00

8.00

10.00

12.00

-10 -5 0 5 10 15 20 25 30 35 40 45

Outside Air Temperature (F)

Sav

ing

s (g

allo

ns/

ho

ur)

W-G system

D-X System

30,000 gallons/year