Manuals / Bryant / Household Appliance / Heating System

Bryant 581A/B manual Selection Procedure With 581B048 Example

Models: 581A/B

1 268
Download 268 pages 21.01 Kb
Page 91
Image 91

SELECTION PROCEDURE (With 581B048 Example)

I DETERMINE COOLING AND HEATING REQUIRE- MENTS AT DESIGN CONDITIONS.

Given:

Required Cooling Capacity (TC) . . . . . . . . . . 44,600 Btuh Sensible Heat Capacity (SHC). . . . . . . . . . . . 32,000 Btuh Required Heating Capacity . . . . . . . . . . . . . . 85,000 Btuh Condenser Entering-Air Temperature . . . . . . . . . . . . 95 F Evaporator Entering-Air Temperature . . . . . . . . .82 F edb,

67 F ewb Evaporator Air Quantity . . . . . . . . . . . . . . . . . . . .1600 cfm External Static Pressure (ESP) . . . . . . . . . . . . 0.75 in. wg Electrical Characteristics (V-Ph-Hz). . . . . . . . . . . 230-1-60

IISELECT UNIT BASED ON REQUIRED COOLING CAPACITY.

Enter the Cooling Capacities table (page 92) at condenser entering temperature of 95 F, evaporator-air entering at 1600 cfm and 80 F db and 67 F wb. The 581B--048115 unit will provide cooling capacity of 48,900 Btuh and a sensible heat capacity of 34,700 Btuh. For evaporator-air temperature other than 80 F edb, calculate sensible heat capacity correction, as required, using the formula found in Note 3 following the Cooling Capacities tables.

For this example:

Correction factor = 1.10 x (1 – .21) x (82 – 80) = 1.738

Multiply the correction factor of 1.738 by 1600 cfm (a total of 2781). From the Gross Cooling Capacities tables find that the sensible heat capacity at 80 F is 34.7 MBtuh (equivalent to 34,700 Btuh). Add 34,700 and 2781 to get the corrected sensible heat capacity of 37,481.

NOTE: Unit ratings are gross capacities and do not include the effect of evaporator-fan motor heat. To calcu- late net capacities, see Step V.

IIISELECT HEATING CAPACITY OF UNIT TO PROVIDE DESIGN CONDITION REQUIREMENTS.

In the Heating Capacities and Efficiencies table (page 10) note that unit 581B--048115 will provide output capacity of 93,150 Btuh, which is adequate for the given application.

IV DETERMINE FAN SPEED AND POWER REQUIRE- MENTS AT DESIGN CONDITIONS.

Before entering the Fan Performance tables, calculate the total static pressure required based on unit components. From the given and the Pressure Drop tables (page 128), find:

External static pressure

.75 in. wg

Total static pressure

= .75 in. wg

Enter the Fan Performance table for 581B--048115 vertical discharge unit on page 104. At 1600 cfm and 0.75 in. wg interpolation is required. The rpm is 1051. The bhp is 0.90. The watts are 897. The factory-installed standard motor and drive are sufficient for operation.

V DETERMINE NET COOLING CAPACITY.

Cooling capacities are gross and do not include indoor-fan motor (IFM) heat. Determine net capacity using the follow- ing formula:

Net capacity = gross capacity – IFM heat

= 48,900 Btuh

– 897 Watts

Btuh

(3.413 Watts )

=48,900 Btuh – 3061 Btuh

Net capacity = 45,839 Btuh

Net sensible capacity = 37,481 Btuh – 3061 Btuh

= 34,420 Btuh

581B036-150

91

Page 90 Page 92
Page 91
Image 91
Bryant 581A/B manual Selection Procedure With 581B048 Example, II Select Unit Based on Required Cooling Capacity
Page 90 Page 92

581A/B specifications

The Bryant 581A/B is a sophisticated rooftop unit designed for commercial heating and cooling applications, striking a balance between performance, efficiency, and versatility. This unit is engineered to cater to various building sizes and configurations, making it an excellent choice for businesses seeking reliable climate control solutions.

One of the standout features of the Bryant 581A/B is its high efficiency. With SEER ratings reaching up to 14.5, this unit can significantly reduce energy costs while providing optimal performance throughout its operational lifespan. The design incorporates advanced compressor technology, allowing for variable speed operation that not only enhances comfort but also promotes energy savings by adjusting to the real-time demands of the environment.

The Bryant 581A/B also integrates cutting-edge refrigerant technology. Utilizing Puron refrigerant, it adheres to current environmental standards, minimizing its impact on ozone depletion while maximizing cooling performance. This commitment to sustainability is complemented by energy-efficient components, including high-efficiency coils and fan motors, which further optimize energy consumption.

In terms of construction, the Bryant 581A/B is built to withstand the rigors of outdoor installation. The unit features a rugged cabinet design with durable, corrosion-resistant materials, ensuring long-term reliability even in challenging weather conditions. Additionally, the easily accessible components simplify maintenance, reducing downtime for businesses.

The functionality of the Bryant 581A/B extends beyond mere cooling and heating. It is equipped with advanced control systems that can be interfaced with building management systems, allowing for seamless integration and enhanced control over indoor climate. This technology provides operators with the ability to monitor and adjust settings remotely, ensuring a comfortable indoor environment while optimizing energy use.

Noise reduction is another important characteristic of the Bryant 581A/B. The unit is designed with sound-dampening features, making it suitable for applications where low noise levels are a priority, such as retail spaces or office buildings.

Overall, the Bryant 581A/B is a robust solution for businesses seeking efficient, reliable, and flexible climate control. Its combination of advanced technology, durable construction, and user-friendly features make it a leading choice in the commercial HVAC market.