Energy efficient refrigerated room with optionally associated geothermal earth loop system
A walk-in refrigeration room system effective for providing and defining an interior chilled air space includes an outer wall layer, a framing layer defining a series of spaces having a depth of at least 6″ inside the outer wall layer, an outer layer of insulation that has been sprayed into the framing layer spaces, a middle wall layer, an inner foamboard insulation layer, a vapor barrier layer, an optional inner wall layer, a door to permit walk-in access to the interior chilled air space, and one or more functional openings to permit electrical connections and/or chilled air to enter or exit the chilled air space. The inner wall layer forms an air-tight envelope when any doors or windows in the inner wall layer are closed. The outer insulation layer and the inner insulation layer overlap in a manner that does not contain any insulation gaps or thermal bridges.
1. A walk-in refrigeration room system sized to accommodate people standing and working therein, and effective for providing and defining an interior chilled air space, the system comprising:
a) an outer wall layer;
b) a framing layer defining a series of spaces having a depth of at least 6″ inside the outer wall layer;
c) an outer insulation layer comprising insulation that has been sprayed into the framing layer spaces;
d) a middle wall layer preferably comprising plywood sheets;
e) an inner insulation layer comprising a foamboard insulation material; and
g) an inner wall layer;
h) a door sized to permit walk-in access to the interior chilled air space;
i) one or more functional openings to permit electrical connections and/or chilled air to enter or exit the chilled air space;
wherein the inner wall layer forms an air-tight envelope when any doors or windows in the inner wall layer are closed; and
wherein the outer insulation layer and the inner insulation layer overlap in a manner that does not contain any insulation gaps or thermal bridges.
2. A refrigeration room system according to claim 1 wherein the outer insulating layer has an R-value of at least R-30 as provided, and wherein the inner insulation layer has an R-value of at least about R-10.
3. A refrigeration room system according to claim 1 , and further including a vapor barrier layer comprising fiberglass reinforced vinyl sheets (FRV) or fiberglass-reinforced plastic sheets (FRP), wherein said vapor barrier layer is positioned between said inner insulation layer and said inner wall layer.