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OVERVIEW

Engineered Heat Loss & Mechanical Design Summary Examples

All Heat Loss calculations include the following details: • Models each room independently for heat loss and shows required heating loads for each loop. • Models all required flow rates and pressure drops for each loop. This information is required to size circulators. • Specifies the proper design water temperature required to circulate throughout the Warmboard panels. • Calculates what rooms need supplemental heat (most homes do not require supplemental heat with Warmboard). • Verifies finish floors will not exceed temperatures beyond industry recommendations (85 degrees maximum). Mechanical & Piping Schematics Option #1 Traditional Water Heater The example below is a a traditional standard water heater used to handle the radiant floor heating loads. This unit does not handle any of the domestic water heating loads. Advantages of this system: • The most simple of all radiant floor mechanical systems. • The least expensive of all radiant floor heating options. • A one pump (variable speed) system, simple and efficient. • Note - Water heater should be approved in advance by local building department Option #2 – Boiler only for radiant floor heating The example shown below is a High Efficiency, modulating, condensing gas boiler (propane or natural) installed with a primary boiler pump and a secondary variable speed pump. Advantages of this design option: • A very simple and efficient design. • The least expensive design option in materials and labor. • The boiler is used for floor heating only. A separate gas water heater (totally independent of boiler system) is used for domestic water heating. The standard water heater uses no electricity and is reliable and serviceable. This may be attractive in areas where the electricity is not reliable. • The variable speed pump conserves electricity and provides very accurate flow rates throughout the tubing, even when pressure drops change. • An outdoor reset control strategy. The boiler will evaluate the outdoor air temperature, and then reset the design water temperature that is circulating throughout the floor. The colder the outdoor temperature the higher the water temperature. This creates greater comfort, less cycling, and higher efficiencies. Option #3 - Combination boiler with indirect domestic hot water tank The example shown below is a High Efficiency, modulating, condensing gas boiler (propane or natural gas) installed with a primary boiler pump and a secondary variable speed pump. This will handle all of the radiant floor heating loads. Also included to accommodate the domestic water heating loads, is a storage tank with an internal heat exchanger and a pump. The boiler is the heating source for all domestic water heating as well as the floor heating. Advantages of this design option: • A simple and efficient design. • This is the most efficient method to heat domestic water (burns less gas, cost less to operate). • The domestic water tank can recovery very fast. This is very attractive for large homes, homes with large bath tubs, or if there are several children living in a home that requires a lot of hot water. • The variable speed pump conserves electricity and provides very accurate flow rates throughout the tubing, even when pressure drops change. • One PVC concentric vent is used to handle the boiler exhaust gases. One flue pipe exhaust can be the only option on some job sites (most common in basements). • An outdoor reset control strategy. The boiler will evaluate the outdoor air temperature, and then reset the design water temperature that is circulating throughout the floor. The colder the outdoor temperature the higher the water temperature. This creates greater comfort, less cycling, and higher efficiencies. Option #4 - Evolution combination heating and domestic hot water The example shown below is a High Efficiency, modulating, condensing, gas (propane or natural) water heater. This unit is factory plumbed with an external flat plate heat exchanger and pump to handle the domestic water heating demands and the radiant floor heating loads. Advantages of this design option: • This unit arrives factory plumbed with an external flat plate heat exchanger and pump already installed. This saves on labor. • This water heater will handle the domestic water heating demands and the radiant floor heating loads. • This unit will take up less space than conventional boilers / storage tanks. • The variable speed pump conserves electricity and provides very accurate flow rates throughout the tubing, even when pressure drops change. • One PVC concentric vent is used to handle the water heater’s exhaust gases. One flue pipe exhaust can be the only option on some job sites (most common in basements). • An outdoor reset control strategy. The water heater will evaluate the outdoor air temperature, and then reset the design water temperature that is circulating throughout the floor. The colder the outdoor temperature the higher the water temperature. This creates greater comfort, less cycling, and higher efficiencies. Option #5 Geothermal heat pump/combination heating and domestic water loads The example below is showing two ground source geothermal heat pumps. Each heat pump is handling the heating loads for a separate storage tank. One storage tank is supply the heating loads for all the domestic hot water, the other storage tank is supplying the heating loads for all the radiant floor demands. Advantages of this design option: • A simple and efficient design, two heat pumps two storage tanks. • The heat pump designated to handle the low temperature radiant floor storage tank will increase the COP’s (efficiency’s) by 20 to 30 percent. • Set points for each storage tank can be simply adjusted in seconds to increase comfort and efficiencies. • Only 3 Pumps used to handle all radiant floor and domestic loads. • The variable speed pump conserves electricity and provides accurate flow rates throughout the tubing , even when pressure drops change. • Also shown is a hydronic cooling fan coil that can be simply interfaced with the radiant storage tank and heat pump.

Heat Loss and Mechanical Main

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